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61 lines
2.3 KiB
61 lines
2.3 KiB
3 years ago
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/*
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* Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Numerics;
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using System.Security.Cryptography;
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using System.Text;
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namespace Framework.Cryptography
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{
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public class SRP6
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{
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static SHA1 _sha1;
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static BigInteger _g;
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static BigInteger _N;
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static SRP6()
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{
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_sha1 = new SHA1Managed();
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_g = new BigInteger(7);
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_N = new BigInteger(new byte[]
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{
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0x89, 0x4B, 0x64, 0x5E, 0x89, 0xE1, 0x53, 0x5B, 0xBD, 0xAD, 0x5B, 0x8B, 0x29, 0x06, 0x50, 0x53,
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0x08, 0x01, 0xB1, 0x8E, 0xBF, 0xBF, 0x5E, 0x8F, 0xAB, 0x3C, 0x82, 0x87, 0x2A, 0x3E, 0x9B, 0xB7,
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}, true, true);
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}
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public static (byte[] Salt, byte[] Verifier) MakeRegistrationData(string username, string password)
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{
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var salt = new byte[0].GenerateRandomKey(32); // random salt
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return (salt, CalculateVerifier(username, password, salt));
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}
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public static byte[] CalculateVerifier(string username, string password, byte[] salt)
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{
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// v = g ^ H(s || H(u || ':' || p)) mod N
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return CalculateVerifierFromHash(_sha1.ComputeHash(Encoding.UTF8.GetBytes(username.ToUpperInvariant() + ":" + password.ToUpperInvariant())), salt);
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}
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// merge this into CalculateVerifier once the sha_pass hack finally gets nuked from orbit
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public static byte[] CalculateVerifierFromHash(byte[] hash, byte[] salt)
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{
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// v = BigInteger.ModPow(gBN, x, BN);
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return BigInteger.ModPow(_g, new BigInteger(_sha1.ComputeHash(salt.Combine(hash)), true), _N).ToByteArray();
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}
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}
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}
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