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Provide computation for new 2FA passwords

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Wizou 2021-12-22 18:25:38 +01:00
parent fa10998618
commit 1396eebca1
1 changed files with 21 additions and 5 deletions
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24
src/Encryption.cs
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@ -364,14 +364,20 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
internal static async Task<InputCheckPasswordSRP> Check2FA(Account_Password accountPassword, Func<Task<string>> getPassword)
{
bool newPassword = false;
if (accountPassword.current_algo is not PasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow algo)
if (accountPassword.current_algo == null && (algo = accountPassword.new_algo as PasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow) != null)
{
int salt1len = algo.salt1.Length;
Array.Resize(ref algo.salt1, salt1len + 32);
RNG.GetBytes(algo.salt1, salt1len, 32);
newPassword = true;
}
else
throw new ApplicationException("2FA authentication uses an unsupported algo: " + accountPassword.current_algo?.GetType().Name);
var g = new BigInteger(algo.g);
var p = BigEndianInteger(algo.p);
var g_b = BigEndianInteger(accountPassword.srp_B);
var g_b_256 = g_b.To256Bytes();
var g_256 = g.To256Bytes();
var validTask = Task.Run(() => ValidityChecks(p, algo.g));
System.Threading.Thread.Sleep(100);
@ -400,12 +406,22 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
sha256.TransformFinalBlock(algo.salt2, 0, algo.salt2.Length);
var x = BigEndianInteger(sha256.Hash);
var v = BigInteger.ModPow(g, x, p);
if (newPassword)
{
await validTask;
return new InputCheckPasswordSRP { A = v.To256Bytes() };
}
var g_b = BigEndianInteger(accountPassword.srp_B);
var g_b_256 = g_b.To256Bytes();
var g_256 = g.To256Bytes();
sha256.Initialize();
sha256.TransformBlock(algo.p, 0, 256, null, 0);
sha256.TransformFinalBlock(g_256, 0, 256);
var k = BigEndianInteger(sha256.Hash);
var v = BigInteger.ModPow(g, x, p);
var k_v = (k * v) % p;
var a = BigEndianInteger(new Int256(RNG).raw);
var g_a = BigInteger.ModPow(g, a, p);