[英]check if the user changed biometric/fingerprint in Android
如果用戶更改了他/她的指紋,我正在尋找一種獲得通知的方法。 我在這里看到了這個答案,但不清楚如何在這種情況下使用“setAllowedAuthenticators”。
如果有人可以提供幫助,我將不勝感激。
[更新] 更新后的代碼:
1- 生成密鑰
generateSecretKey(new KeyGenParameterSpec.Builder(
KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
.setUserAuthenticationRequired(true)
// Invalidate the keys if the user has registered a new biometric
// credential, such as a new fingerprint. Can call this method only
// on Android 7.0 (API level 24) or higher. The variable
.setInvalidatedByBiometricEnrollment(true)
.build());
2-生成密碼
Cipher cipher = getCipher();
SecretKey secretKey = getSecretKey();
try {
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
} catch (KeyPermanentlyInvalidatedException e) {
System.out.print("key has changed");
} catch (InvalidKeyException e) {
e.printStackTrace();
}
3- 驗證
biometricPrompt.authenticate(new CancellationSignal(), excutor, new BiometricPrompt.AuthenticationCallback() {
@Override
public void onAuthenticationSucceeded(BiometricPrompt.AuthenticationResult result) {
}
});
}
});
}
});
錯誤:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.fingerprint_poc, PID: 9523
java.lang.IllegalArgumentException: keystoreAlias must not be empty
at android.security.keystore.KeyGenParameterSpec$Builder.<init>(KeyGenParameterSpec.java:760)
at com.example.fingerprint_poc.task$5.onClick(task.java:153)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) I/Process: Sending signal. PID: 9523 SIG: 9
Cipher cipher = getCipher();
SecretKey secretKey = getSecretKey();
if (getSecretKey() == null){
generateSecretKey(new KeyGenParameterSpec.Builder(
KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
.setUserAuthenticationRequired(true)
// Invalidate the keys if the user has registered a new biometric
// credential, such as a new fingerprint. Can call this method only
// on Android 7.0 (API level 24) or higher. The variable
.setInvalidatedByBiometricEnrollment(true)
.build());
}
try {
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
} catch (KeyPermanentlyInvalidatedException e) {
System.out.print("key has changed");
Toast.makeText(task.this, "changed", Toast.LENGTH_LONG).show();
generateSecretKey(new KeyGenParameterSpec.Builder(
KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
.setUserAuthenticationRequired(true)
// Invalidate the keys if the user has registered a new biometric
// credential, such as a new fingerprint. Can call this method only
// on Android 7.0 (API level 24) or higher. The variable
.setInvalidatedByBiometricEnrollment(true)
.build());
} catch (InvalidKeyException e) {
e.printStackTrace();
}
重要提示: KEY_NAME 必須相同,它不能在實例之間更改。
謝謝大家,這對我也有用,可以檢查指紋(可能和生物特征)是否發生了變化
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