internal static Pbkdf2 GetStream(byte[] key, byte[] salt, int cost, int blockSize, int parallel, int?maxThreads) { byte[] B = GetEffectivePbkdf2Salt(key, salt, cost, blockSize, parallel, maxThreads); var mac = new NoxHD.BouncyCastle.Crypto.Macs.HMac(new NoxHD.BouncyCastle.Crypto.Digests.Sha256Digest()); mac.Init(new KeyParameter(key)); Pbkdf2 kdf = new NoxHD.Crypto.Pbkdf2(mac, B, 1); Security.Clear(B); return(kdf); }
static byte[] MFcrypt(byte[] P, byte[] S, int cost, int blockSize, int parallel, int?maxThreads) { int MFLen = blockSize * 128; if (maxThreads == null) { maxThreads = int.MaxValue; } if (!BitMath.IsPositivePowerOf2(cost)) { throw Exceptions.ArgumentOutOfRange("cost", "Cost must be a positive power of 2."); } Check.Range("blockSize", blockSize, 1, int.MaxValue / 128); Check.Range("parallel", parallel, 1, int.MaxValue / MFLen); Check.Range("maxThreads", (int)maxThreads, 1, int.MaxValue); #if !(USEBC || NETCORE) byte[] B = Pbkdf2.ComputeDerivedKey(new HMACSHA256(P), S, 1, parallel * MFLen); #else var mac = new NoxHD.BouncyCastle.Crypto.Macs.HMac(new NoxHD.BouncyCastle.Crypto.Digests.Sha256Digest()); mac.Init(new KeyParameter(P)); byte[] B = Pbkdf2.ComputeDerivedKey(mac, S, 1, parallel * MFLen); #endif uint[] B0 = new uint[B.Length / 4]; for (int i = 0; i < B0.Length; i++) { B0[i] = BitPacking.UInt32FromLEBytes(B, i * 4); } // code is easier with uint[] ThreadSMixCalls(B0, MFLen, cost, blockSize, parallel, (int)maxThreads); for (int i = 0; i < B0.Length; i++) { BitPacking.LEBytesFromUInt32(B0[i], B, i * 4); } Security.Clear(B0); return(B); }