@Override
public DeterministicKeyChain toDecrypted(CharSequence password) {
checkNotNull(password);
checkArgument(password.length() > 0);
KeyCrypter crypter = getKeyCrypter();
checkState(crypter != null, "Chain not encrypted");
KeyParameter derivedKey = crypter.deriveKey(password);
return toDecrypted(derivedKey);
}
@Override
public DeterministicKeyChain toEncrypted(CharSequence password) {
checkNotNull(password);
checkArgument(password.length() > 0);
checkState(seed != null, "Attempt to encrypt a watching chain.");
checkState(!seed.isEncrypted());
KeyCrypter scrypt = new KeyCrypterScrypt();
KeyParameter derivedKey = scrypt.deriveKey(password);
return toEncrypted(scrypt, derivedKey);
}
// For when a key is encrypted, either decrypt our encrypted private key bytes, or work up the
// tree asking parents
// to decrypt and re-derive.
private BigInteger findOrDeriveEncryptedPrivateKey(KeyCrypter keyCrypter, KeyParameter aesKey) {
if (encryptedPrivateKey != null)
return new BigInteger(1, keyCrypter.decrypt(encryptedPrivateKey, aesKey));
// Otherwise we don't have it, but maybe we can figure it out from our parents. Walk up the tree
// looking for
// the first key that has some encrypted private key data.
DeterministicKey cursor = parent;
while (cursor != null) {
if (cursor.encryptedPrivateKey != null) break;
cursor = cursor.parent;
}
if (cursor == null)
throw new KeyCrypterException(
"Neither this key nor its parents have an encrypted private key");
byte[] parentalPrivateKeyBytes = keyCrypter.decrypt(cursor.encryptedPrivateKey, aesKey);
return derivePrivateKeyDownwards(cursor, parentalPrivateKeyBytes);
}
public DeterministicKey encrypt(
KeyCrypter keyCrypter, KeyParameter aesKey, @Nullable DeterministicKey newParent)
throws KeyCrypterException {
// Same as the parent code, except we construct a DeterministicKey instead of an ECKey.
checkNotNull(keyCrypter);
if (newParent != null) checkArgument(newParent.isEncrypted());
final byte[] privKeyBytes = getPrivKeyBytes();
checkState(privKeyBytes != null, "Private key is not available");
EncryptedData encryptedPrivateKey = keyCrypter.encrypt(privKeyBytes, aesKey);
DeterministicKey key =
new DeterministicKey(
childNumberPath, chainCode, keyCrypter, pub, encryptedPrivateKey, newParent);
if (newParent == null) key.setCreationTimeSeconds(getCreationTimeSeconds());
return key;
}
