自定义asp.net2.0权限提供程序SqlMembershipProvider

;    internal string GenerateSalt()
        {
            byte buf = new byte[16];
            (new RNGCryptoServiceProvider()).GetBytes(buf);
            return Convert.ToBase64String(buf);
        }
        internal string EncodePassword(string pass, int passwordFormat, string salt)
        {
            if (passwordFormat == 0) // MembershipPasswordFormat.Clear
                return pass;

            byte bIn = Encoding.Unicode.GetBytes(pass);
            byte bSalt = Convert.FromBase64String(salt);
            byte bAll = new byte[bSalt.Length + bIn.Length];
            byte bRet = null;

            Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
            Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
            if (passwordFormat == 1)
            { // MembershipPasswordFormat.Hashed
                HashAlgorithm s = HashAlgorithm.Create( Membership.HashAlgorithmType );
                bRet = s.ComputeHash(bAll);
            } else
            {
                bRet = EncryptPassword( bAll );
            }

            return Convert.ToBase64String(bRet);
        }

        internal string UnEncodePassword(string pass, int passwordFormat)
        {
            switch (passwordFormat)
            {
                case 0: // MembershipPasswordFormat.Clear: