public static bool CheckPassword(string password, KeyStore keystore)
{
byte[] derivedkey = new byte[32];
KeyStoreKdfInfo kdf = keystore.Crypto.Kdf;
KeyStoreAesInfo aes = keystore.Crypto.Aes;
if (!KeyStoreCrypto.EncryptScrypt(password
, kdf.Params.N
, kdf.Params.R
, kdf.Params.P
, kdf.Params.Dklen
, kdf.Params.Salt
, out derivedkey))
{
Console.WriteLine("fail to generate scrypt.");
return(false);
}
byte[] iv = aes.Params.Iv;
byte[] ciphertext = aes.Text;
byte[] mac = keystore.Crypto.Mac;
if (!KeyStoreCrypto.VerifyMac(derivedkey, ciphertext, mac))
{
Console.WriteLine("Password do not match.");
return(false);
}
return(true);
}
public static bool DecryptKeyStore(string password, KeyStore keystore, out byte[] privatekey)
{
byte[] derivedkey = new byte[32];
privatekey = null;
KeyStoreKdfInfo kdf = keystore.Crypto.Kdf;
KeyStoreAesInfo aes = keystore.Crypto.Aes;
if (!KeyStoreCrypto.EncryptScrypt(password
, kdf.Params.N
, kdf.Params.R
, kdf.Params.P
, kdf.Params.Dklen
, kdf.Params.Salt
, out derivedkey))
{
Console.WriteLine("fail to generate scrypt.");
return(false);
}
byte[] iv = aes.Params.Iv;
byte[] ciphertext = aes.Text;
byte[] mac = keystore.Crypto.Mac;
if (!KeyStoreCrypto.VerifyMac(derivedkey, ciphertext, mac))
{
Console.WriteLine("Password do not match.");
return(false);
}
byte[] cipherkey = KeyStoreCrypto.GenerateCipherKey(derivedkey);
privatekey = new byte[32];
using (var am = new Aes128CounterMode(iv))
using (var ict = am.CreateDecryptor(cipherkey, null))
{
ict.TransformBlock(ciphertext, 0, ciphertext.Length, privatekey, 0);
}
return(true);
}