public static TLString GetVBytes(TLString passwordBytes, TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow algo)
{
if (!TLUtils.CheckPrime(algo.P.Data, algo.G.Value))
{
return(null);
}
return(TLString.FromBigEndianData(GetBigIntegerBytes(GetV(passwordBytes, algo))));
}
private static BigInteger GetV(TLString passwordBytes, TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow algo)
{
var g = BigInteger.ValueOf(algo.G.Value);
var p = new BigInteger(1, algo.P.Data);
var x_bytes = GetX(passwordBytes, algo);
var x = new BigInteger(1, x_bytes.Data);
return(g.ModPow(x, p));
}
public static TLString GetX(TLString password, TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow algo)
{
var x_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(algo.Salt1.Data, password.Data, algo.Salt1.Data));
x_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(algo.Salt2.Data, x_bytes, algo.Salt2.Data));
x_bytes = PBKDF2.GetHash(x_bytes.AsBuffer(), algo.Salt1.Data.AsBuffer()).ToArray();
x_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(algo.Salt2.Data, x_bytes, algo.Salt2.Data));
return(TLString.FromBigEndianData(x_bytes));
}