private static byte[] DecryptKey(KeyStoreV3 <Pbkdf2Params> keystore, string password)
{
if (ReferenceEquals(keystore, null))
{
throw new ArgumentNullException(nameof(keystore));
}
if (password.IsNullOrEmpty())
{
throw new ArgumentNullException(nameof(password));
}
var crypto = keystore.crypto;
var kdfparams = crypto.kdfparams;
// unsupported cipher
if (crypto.cipher != CIPHER)
{
throw new ArgumentException("unsupported cipher");
}
// unsupported prf
if (kdfparams.prf != Pbkdf2Params.HMACSHA256)
{
throw new ArgumentException("unsupported kdfparams.prf");
}
return(PbkdfCrypt.DecryptPbkdf2Sha256(password, Hex.ToByteArray(crypto.mac),
HexToByteArray(crypto.cipherparams.iv),
HexToByteArray(crypto.ciphertext),
kdfparams.c, kdfparams.salt.ToByteArray(), kdfparams.dklen));
}
internal static PrivateKey DecryptKey(KeyStoreV3 <Pbkdf2Params> keyStore, string password)
{
if (string.IsNullOrEmpty(password))
{
throw new KdfException(ErrorCode.BAD_ARGUMENT, "empty password");
}
if (ReferenceEquals(keyStore, null))
{
throw new KdfException(ErrorCode.BAD_ARGUMENT, "keyStore is null");
}
var crypto = keyStore.crypto;
var kdfparams = keyStore.crypto.kdfparams;
// unsupported cipher
if (crypto.cipher != CIPHER)
{
throw new KdfException(ErrorCode.UNSUPPORTED, $"unsupported cipher:{crypto.cipher}");
}
// unsupported prf
if (kdfparams.prf != Pbkdf2Params.HMACSHA256)
{
throw new KdfException(ErrorCode.UNSUPPORTED, $"unsupported kdfparams.prf:{kdfparams.prf}");
}
var key = PbkdfCrypt.DecryptPbkdf2Sha256(password, crypto.mac.HexToBytes(),
crypto.cipherparams.iv.HexToBytes(),
crypto.ciphertext.HexToBytes(),
kdfparams.c, kdfparams.salt.HexToBytes(), kdfparams.dklen);
return(new PrivateKey(key));
}