title: Is there a .NET library that can sign a request with AWS V4 Signature?
body: <p>I have an API Gateway where I'm setting the authentication to use AWS_IAM.  This requires that I sign each request with the AWS V4 signature and attach the HMAC in the header.  I've found libraries to sign a request with the V4 signature in nodejs.  But I cannot find a library to sign for me.  Even the aws-sdk for .NET has this abstracted for their own specific use case.  Is there a library out there (i've done a quick google search and found no results)?  Or do I need to write out the hmac myself?</p>