private void checkForBitFlip(DeterministicKey k) {
DeterministicKey parent = checkNotNull(k.getParent());
byte[] rederived =
HDKeyDerivation.deriveChildKeyBytesFromPublic(
parent, k.getChildNumber(), HDKeyDerivation.PublicDeriveMode.WITH_INVERSION)
.keyBytes;
byte[] actual = k.getPubKey();
if (!Arrays.equals(rederived, actual))
throw new IllegalStateException(
String.format(
"Bit-flip check failed: %s vs %s",
Arrays.toString(rederived), Arrays.toString(actual)));
}
@Override
public DeterministicKey decrypt(KeyCrypter keyCrypter, KeyParameter aesKey)
throws KeyCrypterException {
checkNotNull(keyCrypter);
// Check that the keyCrypter matches the one used to encrypt the keys, if set.
if (this.keyCrypter != null && !this.keyCrypter.equals(keyCrypter))
throw new KeyCrypterException(
"The keyCrypter being used to decrypt the key is different to the one that was used to encrypt it");
BigInteger privKey = findOrDeriveEncryptedPrivateKey(keyCrypter, aesKey);
DeterministicKey key = new DeterministicKey(childNumberPath, chainCode, privKey, parent);
if (!Arrays.equals(key.getPubKey(), getPubKey()))
throw new KeyCrypterException("Provided AES key is wrong");
if (parent == null) key.setCreationTimeSeconds(getCreationTimeSeconds());
return key;
}
