public override TLObject FromBytes(byte[] bytes, ref int position)
{
bytes.ThrowExceptionIfIncorrect(ref position, Signature);
Flags = GetObject <TLInt>(bytes, ref position);
_newAlgo = GetObject <TLPasswordKdfAlgoBase>(Flags, (int)PasswordInputSettingsFlags.Password, null, bytes, ref position);
_newPasswordHash = GetObject <TLString>(Flags, (int)PasswordInputSettingsFlags.Password, null, bytes, ref position);
_hint = GetObject <TLString>(Flags, (int)PasswordInputSettingsFlags.Password, null, bytes, ref position);
_email = GetObject <TLString>(Flags, (int)PasswordInputSettingsFlags.Email, null, bytes, ref position);
_newSecureSettings = GetObject <TLSecureSecretSettings>(Flags, (int)PasswordInputSettingsFlags.NewSecureSecret, null, bytes, ref position);
return(this);
}
public override TLObject FromBytes(byte[] bytes, ref int position)
{
bytes.ThrowExceptionIfIncorrect(ref position, Signature);
_flags = GetObject <TLInt>(bytes, ref position);
_currentAlgo = GetObject <TLPasswordKdfAlgoBase>(Flags, (int)PasswordFlags.HasPassword, null, bytes, ref position);
_hint = GetObject <TLString>(Flags, (int)PasswordFlags.Hint, null, bytes, ref position);
_emailUnconfirmedPattern = GetObject <TLString>(Flags, (int)PasswordFlags.EmailUnconfirmedPattern, null, bytes, ref position);
NewAlgo = GetObject <TLPasswordKdfAlgoBase>(bytes, ref position);
NewSecureAlgo = GetObject <TLSecurePasswordKdfAlgoBase>(bytes, ref position);
SecretRandom = GetObject <TLString>(bytes, ref position);
return(this);
}
public static TLString GetOldHash(TLPasswordKdfAlgoBase kdfAlgoBase, TLString password)
{
var algo = kdfAlgoBase as TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow;
if (algo != null)
{
var salt1 = algo.Salt1;
var hash1 = GetHash(salt1, password);
return(hash1);
}
return(null);
}
public static void AddClientSalt(TLPasswordKdfAlgoBase algoBase)
{
var algo = algoBase as TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow;
if (algo == null)
{
return;
}
var secureRandom = new SecureRandom();
var clientSalt1 = new byte[32];
secureRandom.NextBytes(clientSalt1);
var newSalt1Data = TLUtils.Combine(algo.Salt1.Data, clientSalt1);
var newSalt1 = TLString.FromBigEndianData(newSalt1Data);
algo.Salt1 = newSalt1;
}
public static TLString GetNewHash(TLPasswordKdfAlgoBase kdfAlgoBase, TLString password)
{
var algo = kdfAlgoBase as TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow;
if (algo != null)
{
var salt1 = algo.Salt1;
var salt2 = algo.Salt2;
var hash1 = GetHash(salt1, password);
var hash2 = GetHash(salt2, hash1);
var hash3 = PBKDF2.GetHash(hash2.Data.AsBuffer(), salt1.Data.AsBuffer());
var hash4 = GetHash(salt2, TLString.FromBigEndianData(hash3.ToArray()));
return(hash4);
}
return(null);
}
public static TLInputCheckPasswordBase GetCheck(TLString xStr, TLLong srpId, TLString srpB, TLPasswordKdfAlgoBase algoBase)
{
var algo = algoBase as TLPasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow;
if (algo != null)
{
if (xStr == null || srpB == null || srpB.Data.Length == 0 || !TLUtils.CheckPrime(algo.P.Data, algo.G.Value))
{
return(new TLInputCheckPasswordEmpty());
}
var g = new BigInteger(1, algo.G.ToBytes().Reverse().ToArray()); // from big-endian to BI (ToBytes - little endian output)
var g_bytes = GetBigIntegerBytes(g);
var p = new BigInteger(1, algo.P.Data);
var p_bytes = GetBigIntegerBytes(p);
var k_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(p_bytes, g_bytes));
var k = new BigInteger(1, k_bytes);
var x = new BigInteger(1, xStr.Data);
var a_bytes = new byte[256];
var secureRandom = new SecureRandom();
secureRandom.NextBytes(a_bytes);
var a = new BigInteger(1, a_bytes);
var A = g.ModPow(a, p);
var A_bytes = GetBigIntegerBytes(A);
var B = new BigInteger(1, srpB.Data);
if (B.CompareTo(BigInteger.Zero) <= 0 || B.CompareTo(p) >= 0)
{
return(null);
}
var B_bytes = GetBigIntegerBytes(B);
var u_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(A_bytes, B_bytes));
var u = new BigInteger(1, u_bytes);
if (u.CompareTo(BigInteger.Zero) == 0)
{
return(null);
}
var B_kgx = B.Subtract(k.Multiply(g.ModPow(x, p)).Mod(p));
if (B_kgx.CompareTo(BigInteger.Zero) < 0)
{
B_kgx = B_kgx.Add(p);
}
if (!TLUtils.CheckGaAndGb(B_kgx, p))
{
return(null);
}
var S = B_kgx.ModPow(a.Add(u.Multiply(x)), p);
var S_bytes = GetBigIntegerBytes(S);
var K_bytes = Telegram.Api.Helpers.Utils.ComputeSHA256(S_bytes);
var p_hash = Telegram.Api.Helpers.Utils.ComputeSHA256(algo.P.Data);
var g_hash = Telegram.Api.Helpers.Utils.ComputeSHA256(g_bytes);
for (var i = 0; i < p_hash.Length; i++)
{
p_hash[i] = (byte)(g_hash[i] ^ p_hash[i]);
}
var M1 = Telegram.Api.Helpers.Utils.ComputeSHA256(TLUtils.Combine(
p_hash,
Telegram.Api.Helpers.Utils.ComputeSHA256(algo.Salt1.Data),
Telegram.Api.Helpers.Utils.ComputeSHA256(algo.Salt2.Data),
A_bytes,
B_bytes,
K_bytes));
return(new TLInputCheckPasswordSRP
{
SRPId = srpId,
A = TLString.FromBigEndianData(A_bytes),
M1 = TLString.FromBigEndianData(M1)
});
}
return(new TLInputCheckPasswordEmpty());
}
