@Override
protected byte[] engineDoFinal() {
try {
ensureKeystoreOperationInitialized();
} catch (InvalidKeyException e) {
throw new ProviderException("Failed to reinitialize MAC", e);
}
byte[] result;
try {
result =
mChunkedStreamer.doFinal(
null,
0,
0,
null, // no signature provided -- this invocation will generate one
null // no additional entropy needed -- HMAC is deterministic
);
} catch (KeyStoreException e) {
throw new ProviderException("Keystore operation failed", e);
}
resetWhilePreservingInitState();
return result;
}
