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The code for the pbkdf2 is

private byte[] Func() {
            var hash1Input = new byte[this.Salt.Length + 4];
            Buffer.BlockCopy(this.Salt, 0, hash1Input, 0, this.Salt.Length);
            Buffer.BlockCopy(GetBytesFromInt(this.BlockIndex), 0, hash1Input, this.Salt.Length, 4);
            var hash1 = this.Algorithm.ComputeHash(hash1Input);

            byte[] finalHash = hash1;
            for (int i = 2; i <= this.IterationCount; i++) {
                hash1 = this.Algorithm.ComputeHash(hash1, 0, hash1.Length);
                for (int j = 0; j < this.BlockSize; j++) {
                    finalHash[j] = (byte)(finalHash[j] ^ hash1[j]);
                }
            }
            if (this.BlockIndex == uint.MaxValue) { throw new InvalidOperationException("Derived key too long."); }
            this.BlockIndex += 1;

            return finalHash;
        }