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Fix 2FA issue under .NET Fw 4.7.2

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minor doc updates
This commit is contained in:
Wizou 2021-12-01 15:50:35 +01:00
parent 12ea8ac1bb
commit 5e04a51e54
6 changed files with 33 additions and 18 deletions
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11
src/Encryption.cs
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@ -362,18 +362,22 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
return output;
}
internal static InputCheckPasswordSRP Check2FA(Account_Password accountPassword, string password)
internal static InputCheckPasswordSRP Check2FA(Account_Password accountPassword, Func<string> getPassword)
{
if (accountPassword.current_algo is not PasswordKdfAlgoSHA256SHA256PBKDF2HMACSHA512iter100000SHA256ModPow algo)
throw new ApplicationException("2FA authentication uses an unsupported algo: " + accountPassword.current_algo?.GetType().Name);
var passwordBytes = Encoding.UTF8.GetBytes(password);
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();
ValidityChecks(p, algo.g);
var validTask = Task.Run(() => ValidityChecks(p, algo.g));
System.Threading.Thread.Sleep(100);
Helpers.Log(3, $"This account has enabled 2FA. A password is needed. {accountPassword.hint}");
var passwordBytes = Encoding.UTF8.GetBytes(getPassword());
validTask.Wait();
using var sha256 = SHA256.Create();
sha256.TransformBlock(algo.salt1, 0, algo.salt1.Length, null, 0);
@ -416,6 +420,7 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
var t = (g_b - k_v) % p; //(positive modulo, if the result is negative increment by p)
if (t.Sign < 0) t += p;
var s_a = BigInteger.ModPow(t, a + u * x, p);
sha256.Initialize();
var k_a = sha256.ComputeHash(s_a.To256Bytes());
hash = sha256.ComputeHash(algo.p);