public PrivateKey Unprotect(string passphrase)
{
ImmutableArray <byte> derivedKey = Kdf.Derive(passphrase);
var mac = CalculateMac(derivedKey, Ciphertext);
if (!Mac.SequenceEqual(mac))
{
throw new IncorrectPassphraseException(
"The input passphrase is incorrect.",
nameof(passphrase),
Mac,
mac
);
}
ImmutableArray <byte> encKey = MakeEncryptionKey(derivedKey);
ImmutableArray <byte> plaintext = Cipher.Decrypt(encKey, Ciphertext);
var key = new PrivateKey(plaintext.ToArray());
Address actualAddress = key.PublicKey.ToAddress();
if (!Address.Equals(actualAddress))
{
throw new MismatchedAddressException(
"The actual address of the unprotected private key does not match to " +
"the expected address of the protected private key.",
Address,
actualAddress
);
}
return(key);
}
