I am writing a program to upload file to Amazon S3 in C with libCurl and OpenSSL. To send a request to amazon I have to sign it - with HMAC-SHA1 http://docs.amazonwebservices.com/fws/latest/DeveloperGuide/index.html?SummaryOfAuthentication.html - here amazon doc that explain it. Help, please, can it be done with openSSL?
