System.Net.Security.SslStreamPal.DecryptMessage C# (CSharp) Method

        public static SecurityStatusPal DecryptMessage(SafeDeleteContext securityContext, byte[] buffer, ref int offset, ref int count)
        {
            int resultSize;
            SecurityStatusPal retVal = EncryptDecryptHelper(securityContext, buffer, offset, count, false, ref buffer, out resultSize);
            if (retVal.ErrorCode == SecurityStatusPalErrorCode.OK || 
                retVal.ErrorCode == SecurityStatusPalErrorCode.Renegotiate)
            {
                count = resultSize;
            }
            return retVal;
        }

        internal SecurityStatusPal Decrypt(byte[] payload, ref int offset, ref int count)
        {
            GlobalLog.Print("SecureChannel#" + Logging.HashString(this) + "::Decrypt() - offset: " + offset.ToString() + " size: " + count.ToString() + " buffersize: " + payload.Length.ToString());

            if (offset < 0 || offset > (payload == null ? 0 : payload.Length))
            {
                GlobalLog.Assert(false, "SecureChannel#" + Logging.HashString(this) + "::Encrypt", "Argument 'offset' out of range.");
                throw new ArgumentOutOfRangeException("offset");
            }

            if (count < 0 || count > (payload == null ? 0 : payload.Length - offset))
            {
                GlobalLog.Assert(false, "SecureChannel#" + Logging.HashString(this) + "::Encrypt", "Argument 'count' out of range.");
                throw new ArgumentOutOfRangeException("count");
            }

            SecurityStatusPal secStatus = SslStreamPal.DecryptMessage(_securityContext, payload, ref offset, ref count);

            return(secStatus);
        }