Android Keystore system | Security

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data-category="Site-Wide Custom Events" data-label="Tab: Community" track-name="community" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Community" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Community </span> </a> </li> <li class="devsite-nav-item"> <a href="/studio" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android Studio" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android Studio </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item"><a href="/privacy-and-security/security-tips" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-tips" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-tips" ><span class="devsite-nav-text" tooltip>Security checklist</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/security-best-practices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-best-practices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-best-practices" ><span class="devsite-nav-text" tooltip>Improve your app's security</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/googleplay-asi" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/googleplay-asi" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/googleplay-asi" ><span class="devsite-nav-text" tooltip>About the app security improvement program</span></a></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Understand common security risks</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/privacy-and-security/risks" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks" ><span class="devsite-nav-text" tooltip>Common risks</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/android-debuggable" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/android-debuggable" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/android-debuggable" ><span class="devsite-nav-text" tooltip>android:debuggable</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/android-exported" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/android-exported" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/android-exported" ><span class="devsite-nav-text" tooltip>android:exported</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/broken-cryptographic-algorithm" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/broken-cryptographic-algorithm" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/broken-cryptographic-algorithm" ><span class="devsite-nav-text" tooltip>Broken or risky cryptographic algorithm</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/cleartext-communications" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/cleartext-communications" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/cleartext-communications" ><span class="devsite-nav-text" tooltip>Cleartext communications</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/cross-app-scripting" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/cross-app-scripting" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/cross-app-scripting" ><span class="devsite-nav-text" tooltip>Cross-App Scripting</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/content-resolver" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/content-resolver" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/content-resolver" ><span class="devsite-nav-text" tooltip>Content resolvers</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/custom-permissions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/custom-permissions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/custom-permissions" ><span class="devsite-nav-text" tooltip>Custom Permissions</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/create-package-context" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/create-package-context" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/create-package-context" ><span class="devsite-nav-text" tooltip>createPackageContext</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/dynamic-code-loading" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/dynamic-code-loading" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/dynamic-code-loading" ><span class="devsite-nav-text" tooltip>Dynamic code loading</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/hardcoded-cryptographic-secrets" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/hardcoded-cryptographic-secrets" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/hardcoded-cryptographic-secrets" ><span class="devsite-nav-text" tooltip>Hardcoded Cryptographic Secrets</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/implicit-intent-hijacking" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/implicit-intent-hijacking" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/implicit-intent-hijacking" ><span class="devsite-nav-text" tooltip>Implicit Intent hijacking</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/file-providers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/file-providers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/file-providers" ><span class="devsite-nav-text" tooltip>Improperly Exposed Directories to FileProvider</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/untrustworthy-contentprovider-provided-filename" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/untrustworthy-contentprovider-provided-filename" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/untrustworthy-contentprovider-provided-filename" ><span class="devsite-nav-text" tooltip>Improperly trusting ContentProvider-provided filename</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/insecure-api-usage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/insecure-api-usage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/insecure-api-usage" ><span class="devsite-nav-text" tooltip>Insecure API usage</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/insecure-library" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/insecure-library" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/insecure-library" ><span class="devsite-nav-text" tooltip>Insecure API or Library</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/insecure-broadcast-receiver" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/insecure-broadcast-receiver" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/insecure-broadcast-receiver" ><span class="devsite-nav-text" tooltip>Insecure broadcast receivers</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/bad-dns" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/bad-dns" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/bad-dns" ><span class="devsite-nav-text" tooltip>Insecure DNS Setup</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/insecure-machine-to-machine" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/insecure-machine-to-machine" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/insecure-machine-to-machine" ><span class="devsite-nav-text" tooltip>Insecure Machine-to-Machine communication setup</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/intent-redirection" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/intent-redirection" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/intent-redirection" ><span class="devsite-nav-text" tooltip>Intent redirection</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/log-info-disclosure" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/log-info-disclosure" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/log-info-disclosure" ><span class="devsite-nav-text" tooltip>Log Info Disclosure</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/path-traversal" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/path-traversal" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/path-traversal" ><span class="devsite-nav-text" tooltip>Path traversal</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/access-control-to-exported-components" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/access-control-to-exported-components" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/access-control-to-exported-components" ><span class="devsite-nav-text" tooltip>Permission-based access control to exported components</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/pending-intent" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/pending-intent" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/pending-intent" ><span class="devsite-nav-text" tooltip>Pending Intents</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/backup-best-practices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/backup-best-practices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/backup-best-practices" ><span class="devsite-nav-text" tooltip>Security best practices for backups</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/sender-of-pending-intents" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/sender-of-pending-intents" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/sender-of-pending-intents" ><span class="devsite-nav-text" tooltip>Sender of Pending Intents</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/secure-clipboard-handling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/secure-clipboard-handling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/secure-clipboard-handling" ><span class="devsite-nav-text" tooltip>Secure Clipboard Handling</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/sensitive-data-external-storage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/sensitive-data-external-storage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/sensitive-data-external-storage" ><span class="devsite-nav-text" tooltip>Sensitive Data Stored in External Storage</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/sql-injection" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/sql-injection" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/sql-injection" ><span class="devsite-nav-text" tooltip>SQL injection</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/sticky-broadcast" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/sticky-broadcast" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/sticky-broadcast" ><span class="devsite-nav-text" tooltip>Sticky Broadcasts</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/strandhogg" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/strandhogg" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/strandhogg" ><span class="devsite-nav-text" tooltip>StrandHogg Attack / Task Affinity Vulnerability</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/tapjacking" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/tapjacking" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/tapjacking" ><span class="devsite-nav-text" tooltip>Tapjacking</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/test-debug" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/test-debug" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/test-debug" ><span class="devsite-nav-text" tooltip>Test and debug features</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-deserialization" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-deserialization" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-deserialization" ><span class="devsite-nav-text" tooltip>Unsafe Deserialization</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-download-manager" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-download-manager" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-download-manager" ><span class="devsite-nav-text" tooltip>Unsafe Download Manager</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-hostname" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-hostname" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-hostname" ><span class="devsite-nav-text" tooltip>Unsafe HostnameVerifier</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-trustmanager" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-trustmanager" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-trustmanager" ><span class="devsite-nav-text" tooltip>Unsafe TrustManager</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-use-of-deeplinks" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-use-of-deeplinks" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-use-of-deeplinks" ><span class="devsite-nav-text" tooltip>Unsafe use of deep links</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/use-of-native-code" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/use-of-native-code" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/use-of-native-code" ><span class="devsite-nav-text" tooltip>Use of native code</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/insecure-webview-native-bridges" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/insecure-webview-native-bridges" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/insecure-webview-native-bridges" ><span class="devsite-nav-text" tooltip>WebView – Native bridges</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/webview-unsafe-file-inclusion" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/webview-unsafe-file-inclusion" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/webview-unsafe-file-inclusion" ><span class="devsite-nav-text" tooltip>WebViews – Unsafe File Inclusion</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/xml-external-entities-injection" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/xml-external-entities-injection" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/xml-external-entities-injection" ><span class="devsite-nav-text" tooltip>XML External Entities Injection</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/weak-prng" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/weak-prng" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/weak-prng" ><span class="devsite-nav-text" tooltip>Weak PRNG</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/unsafe-uri-loading" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/unsafe-uri-loading" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/unsafe-uri-loading" ><span class="devsite-nav-text" tooltip>Webviews - Unsafe URI Loading</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/risks/zip-path-traversal" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/risks/zip-path-traversal" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/risks/zip-path-traversal" ><span class="devsite-nav-text" tooltip>Zip Path Traversal</span></a></li></ul></div></li> <li class="devsite-nav-item"><a href="/google/play/integrity/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /google/play/integrity/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/google/play/integrity/overview" ><span class="devsite-nav-text" tooltip>Protect your app with the Play Integrity API ⍈</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/safetynet/safebrowsing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/safetynet/safebrowsing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/safetynet/safebrowsing" ><span class="devsite-nav-text" tooltip>Avoid known threat URLs</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/safetynet/recaptcha" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/safetynet/recaptcha" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/safetynet/recaptcha" ><span class="devsite-nav-text" tooltip>Challenge malicious traffic with reCAPTCHA</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/safetynet/deprecation-timeline" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/safetynet/deprecation-timeline" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/safetynet/deprecation-timeline" ><span class="devsite-nav-text" tooltip>About the SafetyNet Attestation deprecation</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/security-key-attestation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-key-attestation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-key-attestation" ><span class="devsite-nav-text" tooltip>Verify hardware-backed key pairs</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/cryptography" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/cryptography" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/cryptography" ><span class="devsite-nav-text" tooltip>Work with cryptography</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/keystore" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/keystore" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/keystore" ><span class="devsite-nav-text" tooltip>Work with the Android Keystore System</span></a></li> <li class="devsite-nav-item"><a href="/privacy-and-security/security-dex" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-dex" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-dex" ><span class="devsite-nav-text" tooltip>Run embedded DEX code directly from APK</span></a></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Protect data sent over a network</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/privacy-and-security/security-ssl" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-ssl" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-ssl" ><span class="devsite-nav-text" tooltip>About security with network protocols</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/security-config" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-config" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-config" ><span class="devsite-nav-text" tooltip>Customize your network security settings</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/security-gms-provider" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-gms-provider" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-gms-provider" ><span class="devsite-nav-text" tooltip>Update your security provider to protect against SSL exploits</span></a></li><li class="devsite-nav-item"><a href="/privacy-and-security/security-android-protected-confirmation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/security-android-protected-confirmation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/security-android-protected-confirmation" ><span class="devsite-nav-text" tooltip>Confirm user intentions for sensitive transactions</span></a></li></ul></div></li> <li class="devsite-nav-item"><a href="/privacy-and-security/direct-boot" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-and-security/direct-boot" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-and-security/direct-boot" ><span class="devsite-nav-text" tooltip>Perform actions before initial device unlock</span></a></li> </ul> <ul class="devsite-nav-list" menu="Essentials" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Gemini in Android Studio </span> </span> </li> <li class="devsite-nav-item"> <a href="/gemini-in-android" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Learn more" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Learn more </span> </a> </li> <li class="devsite-nav-item"> <a href="/studio" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Get Android Studio" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Get Android Studio </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Get started </span> </span> </li> <li class="devsite-nav-item"> <a href="/get-started/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Hello world" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Hello world </span> </a> </li> <li class="devsite-nav-item"> <a href="/courses" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Training courses" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Training courses </span> </a> </li> <li class="devsite-nav-item"> <a href="/get-started/codelabs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Tutorials" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Tutorials </span> </a> </li> <li class="devsite-nav-item"> <a href="/kotlin" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Kotlin for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Kotlin for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="https://play.google.com/console/about/guides/monetize/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Monetization with Play ↗️" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Monetization with Play ↗️ </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Extend by device </span> </span> </li> <li class="devsite-nav-item"> <a href="/adaptive-apps" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Adaptive apps" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Adaptive apps </span> </a> </li> <li class="devsite-nav-item"> <a href="/wear" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Wear OS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Wear OS </span> </a> </li> <li class="devsite-nav-item"> <a href="/cars" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android for Cars" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android for Cars </span> </a> </li> <li class="devsite-nav-item"> <a href="/tv" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android TV" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android TV </span> </a> </li> <li class="devsite-nav-item"> <a href="/chrome-os" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: ChromeOS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > ChromeOS </span> </a> </li> <li class="devsite-nav-item"> <a href="/multi-device-development" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Cross-device SDK" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Cross-device SDK </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Build by category </span> </span> </li> <li class="devsite-nav-item"> <a href="/games" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Games" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Games </span> </a> </li> <li class="devsite-nav-item"> <a href="/media" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Camera & Media" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Camera & Media </span> </a> </li> <li class="devsite-nav-item"> <a href="/social-and-messaging" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Social & messaging" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Social & messaging </span> </a> </li> <li class="devsite-nav-item"> <a href="/health-and-fitness" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Health & Fitness" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Health & Fitness </span> </a> </li> <li class="devsite-nav-item"> <a href="/productivity" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Productivity" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Productivity </span> </a> </li> <li class="devsite-nav-item"> <a href="/work/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Enterprise apps" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Enterprise apps </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Get the latest </span> </span> </li> <li class="devsite-nav-item"> <a href="/latest-updates" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Latest updates" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Latest updates </span> </a> </li> <li class="devsite-nav-item"> <a href="/latest-updates/experimental" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Experimental updates" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Experimental updates </span> </a> </li> <li class="devsite-nav-item"> <a href="/studio/preview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android Studio preview" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android Studio preview </span> </a> </li> <li class="devsite-nav-item"> <a href="/jetpack/androidx/versions" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Jetpack & Compose libraries" track-type="navMenu" track-metadata-eventDetail="globalMenu" 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#999; font-style: italic; } </style> <p>The Android Keystore system lets you store cryptographic keys in a container to make them more difficult to extract from the device. Once keys are in the keystore, you can use them for cryptographic operations, with the key material remaining non-exportable. Also, the keystore system lets you restrict when and how keys can be used, such as requiring user authentication for key use or restricting keys to use only in certain cryptographic modes. See the <a href="#SecurityFeatures">Security Features</a> section for more information.</p></p> <p>The keystore system is used by the <code translate="no" dir="ltr"><a href="/reference/android/security/KeyChain">KeyChain</a></code> API, introduced in Android 4.0 (API level 14), as well as the Android Keystore provider feature, introduced in Android 4.3 (API level 18). This document goes over when and how to use the Android Keystore system.</p> <h2 id="SecurityFeatures" data-text="Security features" tabindex="-1">Security features</h2> <p>The Android Keystore system protects key material from unauthorized use in two ways. First, it reduces the risk of unauthorized use of key material from <em>outside</em> the Android device by preventing the extraction of the key material from application processes and from the Android device as a whole. Second, the keystore system reduces the risk of unauthorized use of key material <em>within</em> the Android device by making apps specify the authorized uses of their keys and then enforcing those restrictions outside of the apps' processes.</p> <h3 id="ExtractionPrevention" data-text="Extraction prevention" tabindex="-1">Extraction prevention</h3> <p>Key material of Android Keystore keys is protected from extraction using two security measures: <ul> <li>Key material never enters the application process. When an app performs cryptographic operations using an Android Keystore key, behind the scenes plaintext, ciphertext, and messages to be signed or verified are fed to a system process that carries out the cryptographic operations. If the app's process is compromised, the attacker might be able to use the app's keys but can't extract their key material (for example, to be used outside of the Android device). </li> <li>Key material can be bound to the secure hardware of the Android device, such as the <a href="https://source.android.com/docs/security/features/trusty">Trusted Execution Environment (TEE)</a> or Secure Element (SE). When this feature is enabled for a key, its key material is never exposed outside of secure hardware. If the Android OS is compromised or an attacker can read the device's internal storage, the attacker might be able to use any app's Android Keystore keys on the Android device, but it can't extract them from the device. This feature is enabled only if the device's secure hardware supports the particular combination of key algorithm, block modes, padding schemes, and digests the key is authorized to be used with.</p> <p>To check whether the feature is enabled for a key, obtain a <code translate="no" dir="ltr"><a href="/reference/android/security/keystore/KeyInfo">KeyInfo</a></code> for the key. The next step depends on your app’s target SDK version: <ul> <li>If your app targets Android 10 (API level 29) or higher, inspect the return value of <code translate="no" dir="ltr"><a href="/reference/android/security/keystore/KeyInfo#getSecurityLevel()">getSecurityLevel()</a></code>. Return values matching <code translate="no" dir="ltr">KeyProperties.SecurityLevelEnum.TRUSTED_ENVIRONMENT</code> or <code translate="no" dir="ltr">KeyProperties.SecurityLevelEnum.STRONGBOX</code> indicate that the key resides within secure hardware.</li> <li>If your app targets Android 9 (API level 28) or lower, inspect the boolean return value of <code translate="no" dir="ltr"><a href="/reference/android/security/keystore/KeyInfo#isInsideSecureHardware()">KeyInfo.isInsideSecurityHardware()</a></code>.</li> </ul> </li> </ul></p> <h3 id="HardwareSecurityModule" data-text="Hardware security module" tabindex="-1">Hardware security module</h3> <p>Supported devices running Android 9 (API level 28) or higher can have a <a href="https://source.android.com/docs/security/features/keystore"><em>StrongBox Keymaster</em></a>, an implementation of the Keymaster or Keymint HAL that resides in a hardware security module-like secure element. While hardware security modules can refer to many different implementations of key-storage where a Linux kernel compromise can't reveal them, such as TEE, StrongBox explicitly refers to devices such as embedded Secure Elements (eSE) or on-SoC secure processing units (iSE).</p> <p>The module contains the following:</p> <ul> <li>Its own CPU</li> <li>Secure storage</li> <li>A true random-number generator</li> <li>Additional mechanisms to resist package tampering and unauthorized sideloading of apps</li> <li>A secure timer</li> <li>A reboot notification pin (or equivalent), like general-purpose input/output (GPIO)</li> </ul> <p>To support low-power StrongBox implementations, a subset of algorithms and key sizes are supported:</p> <ul> <li>RSA 2048</li> <li>AES 128 and 256</li> <li>ECDSA, ECDH P-256</li> <li>HMAC-SHA256 (supports key sizes between 8 bytes and 64 bytes, inclusive)</li> <li>Triple DES</li> <li>Extended Length APDUs</li> <li>Key Attestation</li> <li>Amendment H support for upgrade</li> </ul> <p>When generating or importing keys using the <a href="https://developer.android.com/reference/java/security/KeyStore"><code translate="no" dir="ltr">KeyStore</code></a> class, you indicate a preference for storing the key in the StrongBox Keymaster by passing <code translate="no" dir="ltr">true</code> to the <a href="https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.Builder#setIsStrongBoxBacked(boolean)"><code translate="no" dir="ltr">setIsStrongBoxBacked()</code></a> method.</p> <aside class="note"><strong>Note:</strong><span> If the StrongBox Keymaster isn't available for the given algorithm and key size associated with a key, the framework throws a <a href="/reference/android/security/keystore/StrongBoxUnavailableException"><code translate="no" dir="ltr">StrongBoxUnavailableException</code></a>. If you get this exception, try using TEE for your key storage as a fallback option.</span></aside> <p>Although StrongBox is a little slower and resource constrained (meaning that it supports fewer concurrent operations) compared to TEE, StrongBox provides better security guarantees against physical and side-channel attacks. If you want to prioritize higher security guarantees over app resource efficiency, we recommend using StrongBox on the devices where it is available. Wherever StrongBox isn't available, your app can always fall back to TEE to store key materials.</p> <h3 id="KeyUseAuthorizations" data-text="Key use authorizations" tabindex="-1">Key use authorizations</h3> <p>To avoid unauthorized use of keys on the Android device, Android Keystore lets apps specify authorized uses of their keys when they generate or import the keys. Once a key is generated or imported, its authorizations can't be changed. Authorizations are then enforced by the Android Keystore whenever the key is used. This is an advanced security feature that is generally useful only if your requirements are that a compromise of your application process after key generation/import (but not before or during) can't lead to unauthorized uses of the key.</p> <p>Supported key use authorizations fall into the following categories:</p> <ul> <li><b>Cryptography:</b> the key can only be used with authorized key algorithms, operations, or purposes (encrypt, decrypt, sign, verify), padding schemes, block modes, or digests.</li> <li><b>Temporal validity interval:</b> the key is authorized for use only during a defined interval of time.</li> <li><b>User authentication:</b> the key can only be used if the user has been authenticated recently enough. See <a href="#UserAuthentication">Require user authentication for key use</a>. </li> </ul> <p>As an additional security measure for keys whose key material is inside secure hardware (see <a href="/reference/android/security/keystore/KeyInfo#isInsideSecureHardware()"><code translate="no" dir="ltr">KeyInfo.isInsideSecurityHardware()</code></a> or, for apps targeting Android 10 (API level 29) or higher, <a href="/reference/android/security/keystore/KeyInfo#getSecurityLevel()"><code translate="no" dir="ltr">KeyInfo.getSecurityLevel()</code></a>), some key use authorizations might be enforced by the secure hardware, depending on the Android device. Secure hardware normally enforces cryptographic and user authentication authorizations. However, secure hardware doesn't usually enforce temporal validity interval authorizations, because it normally doesn't have an independent, secure real-time clock.</p> <p>You can query whether a key's user authentication authorization is enforced by the secure hardware using <code translate="no" dir="ltr"><a href="/reference/android/security/keystore/KeyInfo#isUserAuthenticationRequirementEnforcedBySecureHardware()">KeyInfo.isUserAuthenticationRequirementEnforcedBySecureHardware()</a></code>.</p> <h2 id="WhichShouldIUse" data-text="Choose between a keychain and the Android Keystore provider" tabindex="-1">Choose between a keychain and the Android Keystore provider</h2> <p>Use the <code translate="no" dir="ltr"><a href="/reference/android/security/KeyChain">KeyChain</a></code> API when you want system-wide credentials. When an app requests the use of any credential through the <code translate="no" dir="ltr">KeyChain</code> API, users can choose, through a system-provided UI, which of the installed credentials an app can access. This lets several apps use the same set of credentials with user consent.</p> <p>Use the Android Keystore provider to let an individual app store its own credentials, which only that app can access. This provides a way for apps to manage credentials that only they can use while providing the same security benefits that the <code translate="no" dir="ltr">KeyChain</code> API provides for system-wide credentials. This method doesn't require the user to select the credentials.</p> <h2 id="UsingAndroidKeyStore" data-text="Use the Android Keystore provider" tabindex="-1">Use the Android Keystore provider</h2> <p> To use this feature, you use the standard <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore">KeyStore</a></code> and <code translate="no" dir="ltr"><a href="/reference/java/security/KeyPairGenerator">KeyPairGenerator</a></code> or <code translate="no" dir="ltr"><a href="/reference/javax/crypto/KeyGenerator">KeyGenerator</a></code> classes along with the <code translate="no" dir="ltr">AndroidKeyStore</code> provider introduced in Android 4.3 (API level 18).</p> <p><code translate="no" dir="ltr">AndroidKeyStore</code> is registered as a <code translate="no" dir="ltr">KeyStore</code> type for use with the <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore#getInstance(java.lang.String)">KeyStore.getInstance(type)</a></code> method and as a provider for use with the <code translate="no" dir="ltr"><a href="/reference/java/security/KeyPairGenerator#getInstance(java.lang.String, java.lang.String)">KeyPairGenerator.getInstance(algorithm, provider)</a></code> and <code translate="no" dir="ltr"><a href="/reference/javax/crypto/KeyGenerator#getInstance(java.lang.String, java.lang.String)">KeyGenerator.getInstance(algorithm, provider)</a></code> methods.</p> <p>Because cryptographic operations may be time-consuming, apps should avoid using <code translate="no" dir="ltr">AndroidKeyStore</code> on their main thread to ensure that the app's UI remains responsive. (<code translate="no" dir="ltr">StrictMode</code> can help you find places where this is not the case.)</p> <h3 id="GeneratingANewPrivateKey" data-text="Generate a new private or secret key" tabindex="-1">Generate a new private or secret key</h3> <p>To generate a new <code translate="no" dir="ltr">KeyPair</code> containing a <code translate="no" dir="ltr"><a href="/reference/java/security/PrivateKey">PrivateKey</a></code>, you must specify the initial X.509 attributes of the certificate. You can use <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore#setKeyEntry(java.lang.String, java.security.Key, char[], java.security.cert.Certificate[])">KeyStore.setKeyEntry()</a></code> to replace the certificate at a later time with a certificate signed by a certificate authority (CA).</p> <p>To generate the key pair, use a <code translate="no" dir="ltr"><a href="/reference/java/security/KeyPairGenerator">KeyPairGenerator</a></code> with <code translate="no" dir="ltr"><a href="/reference/android/security/keystore/KeyGenParameterSpec">KeyGenParameterSpec</a></code>:</p> <div> <div class="ds-selector-tabs"><section><h3 id="kotlin" data-text="Kotlin" tabindex="-1">Kotlin</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Generate a new EC key pair entry in the Android Keystore by</span> <span class="devsite-syntax-cm"> * using the KeyPairGenerator API. The private key can only be</span> <span class="devsite-syntax-cm"> * used for signing or verification and only with SHA-256 or</span> <span class="devsite-syntax-cm"> * SHA-512 as the message digest.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">kpg</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyPairGenerator</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyPairGenerator</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">KEY_ALGORITHM_EC</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"AndroidKeyStore"</span> <span class="devsite-syntax-p">)</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">parameterSpec</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyGenParameterSpec</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyGenParameterSpec</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">Builder</span><span class="devsite-syntax-p">(</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PURPOSE_SIGN</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">or</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PURPOSE_VERIFY</span> <span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">run</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">setDigests</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">DIGEST_SHA256</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">DIGEST_SHA512</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">build</span><span class="devsite-syntax-p">()</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-n">kpg</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">initialize</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">parameterSpec</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">kp</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">kpg</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">generateKeyPair</span><span class="devsite-syntax-p">()</span></pre></devsite-code> </section><section><h3 id="java" data-text="Java" tabindex="-1">Java</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Java"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Generate a new EC key pair entry in the Android Keystore by</span> <span class="devsite-syntax-cm"> * using the KeyPairGenerator API. The private key can only be</span> <span class="devsite-syntax-cm"> * used for signing or verification and only with SHA-256 or</span> <span class="devsite-syntax-cm"> * SHA-512 as the message digest.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-n">KeyPairGenerator</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">kpg</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyPairGenerator</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">KEY_ALGORITHM_EC</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">kpg</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">initialize</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-k">new</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyGenParameterSpec</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">Builder</span><span class="devsite-syntax-p">(</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PURPOSE_SIGN</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">|</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PURPOSE_VERIFY</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">setDigests</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">DIGEST_SHA256</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyProperties</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">DIGEST_SHA512</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">build</span><span class="devsite-syntax-p">());</span> <span class="devsite-syntax-n">KeyPair</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">kp</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">kpg</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">generateKeyPair</span><span class="devsite-syntax-p">();</span></pre></devsite-code> </section></div> </div> <h3 id="ImportingEncryptedKeys" data-text="Import encrypted keys into secure hardware" tabindex="-1">Import encrypted keys into secure hardware</h3> <p>Android 9 (API level 28) and higher lets you import encrypted keys securely into the keystore using an ASN.1‑encoded key format. The Keymaster then decrypts the keys in the keystore, so the content of the keys never appears as plaintext in the device's host memory. This process provides additional key decryption security.</p> <aside class="note"><strong>Note:</strong><span> This feature is supported only on devices that ship with Keymaster 4 or higher.</span></aside> <p>To support secure importing of encrypted keys into the keystore, complete the following steps:</p> <ol> <li><p>Generate a key pair that uses the <a href="/reference/android/security/keystore/KeyProperties#PURPOSE_WRAP_KEY"><code translate="no" dir="ltr">PURPOSE_WRAP_KEY</code></a> purpose. We recommend that you add attestation to this key pair as well.</p></li> <li><p>On a server or machine that you trust, generate the ASN.1 message for the <code translate="no" dir="ltr">SecureKeyWrapper</code>.</p> <p>The wrapper contains the following schema:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Maxima"><code translate="no" dir="ltr"><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">KeyDescription</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">::=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">SEQUENCE</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">keyFormat</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">INTEGER</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">authorizationList</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">AuthorizationList</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">SecureKeyWrapper</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">::=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">SEQUENCE</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">wrapperFormatVersion</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">INTEGER</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">encryptedTransportKey</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">OCTET_STRING</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">initializationVector</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">OCTET_STRING</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">keyDescription</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">KeyDescription</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">secureKey</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">OCTET_STRING</span><span class="devsite-syntax-p">,</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">tag</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">OCTET_STRING</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> </code></pre></devsite-code></li> <li><p>Create a <a href="/reference/android/security/keystore/WrappedKeyEntry"><code translate="no" dir="ltr">WrappedKeyEntry</code></a> object, passing in the ASN.1 message as a byte array.</p></li> <li><p>Pass this <code translate="no" dir="ltr">WrappedKeyEntry</code> object into the overload of <a href="/reference/java/security/KeyStore#setEntry(java.lang.String,%20java.security.KeyStore.Entry,%20java.security.KeyStore.ProtectionParameter)"><code translate="no" dir="ltr">setEntry()</code></a> that accepts a <a href="/reference/java/security/KeyStore.Entry"><code translate="no" dir="ltr">Keystore.Entry</code></a> object.</p></li> </ol> <h3 id="WorkingWithKeyStoreEntries" data-text="Work with keystore entries" tabindex="-1">Work with keystore entries</h3> <p>You can access the <code translate="no" dir="ltr">AndroidKeyStore</code> provider through all the standard <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore">KeyStore</a></code> APIs.</p> <h4 id="ListingEntries" data-text="List entries" tabindex="-1">List entries</h4> <p>List entries in the keystore by calling the <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore#aliases()">aliases()</a></code> method:</p> <div> <div class="ds-selector-tabs"><section><h3 id="kotlin" data-text="Kotlin" tabindex="-1">Kotlin</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Load the Android KeyStore instance using the</span> <span class="devsite-syntax-cm"> * AndroidKeyStore provider to list the currently stored entries.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">ks</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">apply</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">aliases</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Enumeration<String></span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">aliases</span><span class="devsite-syntax-p">()</span></pre></devsite-code> </section><section><h3 id="java" data-text="Java" tabindex="-1">Java</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Java"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Load the Android KeyStore instance using the</span> <span class="devsite-syntax-cm"> * AndroidKeyStore provider to list the currently stored entries.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">Enumeration<String></span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">aliases</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">aliases</span><span class="devsite-syntax-p">();</span></pre></devsite-code> </section></div> </div> <h4 id="SigningAndVerifyingData" data-text="Sign and verify data" tabindex="-1">Sign and verify data</h4> <p>Sign data by fetching the <code translate="no" dir="ltr"><a href="/reference/java/security/KeyStore.Entry">KeyStore.Entry</a></code> from the keystore and using the <code translate="no" dir="ltr"><a href="/reference/java/security/Signature">Signature</a></code> APIs, such as <code translate="no" dir="ltr"><a href="/reference/java/security/Signature#sign()">sign()</a></code>:</p> <div> <div class="ds-selector-tabs"><section><h3 id="kotlin" data-text="Kotlin" tabindex="-1">Kotlin</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Use a PrivateKey in the KeyStore to create a signature over</span> <span class="devsite-syntax-cm"> * some data.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">ks</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">apply</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">entry</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">Entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getEntry</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">!is</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PrivateKeyEntry</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Log</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">w</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">TAG</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"Not an instance of a PrivateKeyEntry"</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">signature</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ByteArray</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"SHA256withECDSA"</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">run</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">initSign</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">privateKey</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">update</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">data</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">sign</span><span class="devsite-syntax-p">()</span> <span class="devsite-syntax-p">}</span></pre></devsite-code> </section><section><h3 id="java" data-text="Java" tabindex="-1">Java</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Java"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Use a PrivateKey in the KeyStore to create a signature over</span> <span class="devsite-syntax-cm"> * some data.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">Entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getEntry</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-o">!</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">instanceof</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">PrivateKeyEntry</span><span class="devsite-syntax-p">))</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Log</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">w</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">TAG</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"Not an instance of a PrivateKeyEntry"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">s</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"SHA256withECDSA"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">initSign</span><span class="devsite-syntax-p">(((</span><span class="devsite-syntax-n">PrivateKeyEntry</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">getPrivateKey</span><span class="devsite-syntax-p">());</span> <span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">update</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">data</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-kt">byte</span><span class="devsite-syntax-o">[]</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">signature</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">sign</span><span class="devsite-syntax-p">();</span></pre></devsite-code> </section></div> </div> <p>Similarly, verify data with the <code translate="no" dir="ltr"><a href="/reference/java/security/Signature#verify(byte[])">verify(byte[])</a></code> method:</p> <div> <div class="ds-selector-tabs"><section><h3 id="kotlin" data-text="Kotlin" tabindex="-1">Kotlin</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Kotlin"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Verify a signature previously made by a private key in the</span> <span class="devsite-syntax-cm"> * KeyStore. This uses the X.509 certificate attached to the</span> <span class="devsite-syntax-cm"> * private key in the KeyStore to validate a previously</span> <span class="devsite-syntax-cm"> * generated signature.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">ks</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">apply</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getEntry</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">as?</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">PrivateKeyEntry</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">==</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Log</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">w</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">TAG</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"Not an instance of a PrivateKeyEntry"</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">false</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-kd">val</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nv">valid</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kt">Boolean</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"SHA256withECDSA"</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">run</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">initVerify</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">certificate</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">update</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">data</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">verify</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">signature</span><span class="devsite-syntax-p">)</span> <span class="devsite-syntax-p">}</span></pre></devsite-code> </section><section><h3 id="java" data-text="Java" tabindex="-1">Java</h3> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Java"><span class="devsite-syntax-cm">/*</span> <span class="devsite-syntax-cm"> * Verify a signature previously made by a private key in the</span> <span class="devsite-syntax-cm"> * KeyStore. This uses the X.509 certificate attached to the</span> <span class="devsite-syntax-cm"> * private key in the KeyStore to validate a previously</span> <span class="devsite-syntax-cm"> * generated signature.</span> <span class="devsite-syntax-cm"> */</span> <span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"AndroidKeyStore"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">load</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">KeyStore</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">Entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">ks</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getEntry</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">alias</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">null</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-k">if</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-o">!</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">instanceof</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">PrivateKeyEntry</span><span class="devsite-syntax-p">))</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Log</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">w</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">TAG</span><span class="devsite-syntax-p">,</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-s">"Not an instance of a PrivateKeyEntry"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">return</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">false</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">s</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">Signature</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">getInstance</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-s">"SHA256withECDSA"</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">initVerify</span><span class="devsite-syntax-p">(((</span><span class="devsite-syntax-n">PrivateKeyEntry</span><span class="devsite-syntax-p">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">entry</span><span class="devsite-syntax-p">).</span><span class="devsite-syntax-na">getCertificate</span><span class="devsite-syntax-p">());</span> <span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">update</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">data</span><span class="devsite-syntax-p">);</span> <span class="devsite-syntax-kt">boolean</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">valid</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">=</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-n">s</span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-na">verify</span><span class="devsite-syntax-p">(</span><span class="devsite-syntax-n">signature</span><span class="devsite-syntax-p">);</span></pre></devsite-code> </section></div> </div> <h3 id="UserAuthentication" data-text="Require user authentication for key use" tabindex="-1">Require user authentication for key use</h3> <p>When generating or importing a key into the <code translate="no" dir="ltr">AndroidKeyStore</code>, you can specify that the key is only authorized to be used if the user has been authenticated. The user is authenticated using a subset of their secure lock screen credentials (pattern/PIN/password, biometric credentials). <p>This is an advanced security feature that is generally useful only if your requirements are that a compromise of your application process after key generation/import (but not before or during) can't bypass the requirement for the user to be authenticated to use the key. <p>When a key is only authorized to be used if the user has been authenticated, you can call <a href="/reference/android/security/keystore/KeyGenParameterSpec.Builder#setUserAuthenticationParameters(int,%20int)"><code translate="no" dir="ltr">setUserAuthenticationParameters()</code></a> to configure it to operate in one of the following modes:</p> <dl> <dt>Authorize for a duration of time</dt> <dd>All keys are authorized for use as soon as the user authenticates using one of the credentials specified.</dd> <dt>Authorize for the duration of a specific cryptographic operation</dt> <dd><p>Each operation involving a specific key must be individually authorized by the user.</p> <p>Your app starts this process by calling <a href="https://developer.android.com/reference/android/hardware/biometrics/BiometricPrompt#authenticate(android.hardware.biometrics.BiometricPrompt.CryptoObject,%20android.os.CancellationSignal,%20java.util.concurrent.Executor,%20android.hardware.biometrics.BiometricPrompt.AuthenticationCallback)"><code translate="no" dir="ltr">authenticate()</code></a> on an instance of <code translate="no" dir="ltr">BiometricPrompt</code>.</p></dd> </dl> <p>For each key that you create, you can choose to support a <a href="/reference/android/security/keystore/KeyProperties#AUTH_BIOMETRIC_STRONG">strong biometric credential</a>, a <a href="/reference/android/security/keystore/KeyProperties#AUTH_DEVICE_CREDENTIAL">lock screen credential</a>, or both types of credentials. To determine whether the user has set up the credentials that your app's key relies on, call <a href="/reference/android/hardware/biometrics/BiometricManager#canAuthenticate(int)"><code translate="no" dir="ltr">canAuthenticate()</code></a>.</p> <p>If a key only supports biometric credentials, the key is invalidated by default whenever new biometric enrollments are added. You can configure the key to remain valid when new biometric enrollments are added. To do so, pass <code translate="no" dir="ltr">false</code> into <a href="/reference/android/security/keystore/KeyGenParameterSpec.Builder#setInvalidatedByBiometricEnrollment(boolean)"><code translate="no" dir="ltr">setInvalidatedByBiometricEnrollment()</code></a>.</p> <p>Learn more about how to add biometric authentication capabilities into your app, including how to <a href="/training/sign-in/biometric-auth">show a biometric authentication dialog</a>.</p> <h2 id="SupportedAlgorithms" data-text="Supported algorithms" tabindex="-1">Supported algorithms</h2> <ul> <li><a href="/reference/javax/crypto/Cipher"><code translate="no" dir="ltr">Cipher</code></a></li> <li><a href="/reference/javax/crypto/KeyGenerator"><code translate="no" dir="ltr">KeyGenerator</code></a></li> <li><a href="/reference/java/security/KeyFactory"><code translate="no" dir="ltr">KeyFactory</code></a></li> <li><code translate="no" dir="ltr">KeyStore</code> (supports the same key types as <code translate="no" dir="ltr">KeyGenerator</code> and <code translate="no" dir="ltr">KeyPairGenerator</code>)</li> <li><a href="/reference/java/security/KeyPairGenerator"><code translate="no" dir="ltr">KeyPairGenerator</code></a></li> <li><a href="/reference/javax/crypto/Mac"><code translate="no" dir="ltr">Mac</code></a></li> <li><a href="/reference/java/security/Signature"><code translate="no" dir="ltr">Signature</code></a></li> <li><a href="/reference/javax/crypto/SecretKeyFactory"><code translate="no" dir="ltr">SecretKeyFactory</code></a></li> </ul> <h2 id="blog-articles" data-text="Blog articles" tabindex="-1">Blog articles</h2> <p>See the blog entry <a href="http://android-developers.blogspot.com/2012/03/unifying-key-store-access-in-ics.html"> Unifying Key Store Access in ICS</a>.</p> <devsite-hats-survey class="nocontent" hats-id="VxqvKSur40kxBYCLVTd0SSGykbno" listnr-id="5207477"></devsite-hats-survey> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Content and code samples on this page are subject to the licenses described in the <a href="/license">Content License</a>. 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