I'm developing an Amazon Simple Message Queue app in C++  and I'm having trouble working out what string I have to sign when I make a query. I've been through the docs (especially this
), had a gawp through the libAWS code (which I can't use because of licensing), looked at loads of source code in other languages and I can't see what I'm doing incorrectly. I've even hand run what I think the algorithm for creating a signing string is using the OpenSSL and cURL command lines to do the Base64 and URL encoding.
Rather than bore everyone with questions like "here's a URL, what's the signing string?" can anyone point me at an app somewhere that works out what the signing string should be for an arbitrary query URL?
 Yes I am a masochist. But only when paid enough.
PS: Found out what was wrong, my signing string was correct, my URL encoding was correct, my HmacSHA1 was correct, my Base64 encoder was chucking an extra newline in... arrrggggghhhhh. And I didn't spot it for three days as I always assume other people's code is correct!