System.Net.Security.NegotiateStreamPal.VerifySignature C# (CSharp) Метод

        internal static int VerifySignature(SafeDeleteContext securityContext, byte[] buffer, int offset, int count)
        {
            // validate offset within length
            if (offset < 0 || offset > (buffer == null ? 0 : buffer.Length))
            {
                NetEventSource.Info("Argument 'offset' out of range.");
                throw new ArgumentOutOfRangeException(nameof(offset));
            }

            // validate count within offset and end of buffer
            if (count < 0 ||
                count > (buffer == null ? 0 : buffer.Length - offset))
            {
                NetEventSource.Info("Argument 'count' out of range.");
                throw new ArgumentOutOfRangeException(nameof(count));
            }

            // setup security buffers for ssp call
            // one points at signed data
            // two will receive payload if signature is valid
            SecurityBuffer[] securityBuffer = new SecurityBuffer[2];
            securityBuffer[0] = new SecurityBuffer(buffer, offset, count, SecurityBufferType.SECBUFFER_STREAM);
            securityBuffer[1] = new SecurityBuffer(0, SecurityBufferType.SECBUFFER_DATA);

            // call SSP function
            int errorCode = SSPIWrapper.VerifySignature(
                                GlobalSSPI.SSPIAuth,
                                securityContext,
                                securityBuffer,
                                0);
            // throw if error
            if (errorCode != 0)
            {
                NetEventSource.Info($"VerifySignature threw error: {errorCode.ToString("x", NumberFormatInfo.InvariantInfo)}");
                throw new Win32Exception(errorCode);
            }

            // not sure why this is here - retained from Encrypt code above
            if (securityBuffer[1].type != SecurityBufferType.SECBUFFER_DATA)
                throw new InternalException();

            // return validated payload size 
            return securityBuffer[1].size;
        }