override fun createKey()

in BiometricAuthentication/app/src/main/java/com/example/android/biometricauth/MainActivity.kt [239:266]

23 lines of code
2 McCabe index (conditional complexity)


    override fun createKey(keyName: String, invalidatedByBiometricEnrollment: Boolean) {
        // The enrolling flow for fingerprint. This is where you ask the user to set up fingerprint
        // for your flow. Use of keys is necessary if you need to know if the set of enrolled
        // fingerprints has changed.
        try {
            keyStore.load(null)

            val keyProperties = KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT
            val builder = KeyGenParameterSpec.Builder(keyName, keyProperties)
                    .setBlockModes(BLOCK_MODE_CBC)
                    .setUserAuthenticationRequired(true)
                    .setEncryptionPaddings(ENCRYPTION_PADDING_PKCS7)
                    .setInvalidatedByBiometricEnrollment(invalidatedByBiometricEnrollment)

            keyGenerator.run {
                init(builder.build())
                generateKey()
            }
        } catch (e: Exception) {
            when (e) {
                is NoSuchAlgorithmException,
                is InvalidAlgorithmParameterException,
                is CertificateException,
                is IOException -> throw RuntimeException(e)
                else -> throw e
            }
        }
    }