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sha256 encoding probelm on AWS

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  • sha256 encoding probelm on AWS

    I'm trying to write a few functions to sign messages in order to send to Amazon's AWS. I've almost got it, but I think I need some help from someone who knows dot net a bit better than me.

    I need to sha256 some things (not hmacsha256), but I'm getting some incorrect results. Below is my sha256 function based on the Plain SHA1 function found here: https://www.alphasoftware.com/docume...tal%20Hash.xml

    Code:
    function sha256 as c (string as c)    
        dim data as b
        data = convert_acp_to_utf8(string)
        dim result as b
        dim sham as ::System::Security::Cryptography::SHA256Managed = new ::System::Security::Cryptography::SHA256Managed()
        result = sham.ComputeHash(data)
        
        sha256 = *to_hex(result)
    
    
    end function
    However, it gives me incorrect results. Based on the tests here: http://docs.aws.amazon.com/general/l...est-suite.html when I hash this value:
    Code:
    [COLOR=#444444][FONT=&amp]GET
    [/FONT][/COLOR]/
    Param1=value1&Param2=value2
    host:example.amazonaws.com
    x-amz-date:20150830T123600Z
    
    host;x-amz-date
    [COLOR=#444444][FONT=&amp]e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855[/FONT][/COLOR]
    I should get this value in return (verified with http://www.xorbin.com/tools/sha256-hash-calculator):
    Code:
    [COLOR=#444444][FONT=&amp]816cd5b414d056048ba4f7c5386d6e0533120fb1fcfa93762cf0fc39e2cf19e0[/FONT][/COLOR]
    , however I get
    Code:
    9e487d40177520aed8763d24c77c7179f67622debbd2b8188d93138ba6748ade
    After doing some research, i found this post on SO: http://stackoverflow.com/questions/1...ng-with-sha256 That states the default encoding for dotnet is utf16, but AWS uses utf8.

    So, my question is, how do I change the encoding type for my sha function? It appears that I need to somehow seed my data blob variable as utf8 encoding, but I'm not sure how to do that.
    Thanks!

  • #2
    Re: sha256 encoding probelm on AWS

    I've figured out that the SHA256 of crlf() is different from the SHA256 of lf. So in my code, I need to convert all crlf's to lf's. The sha256 then works correctly.

    Comment


    • #3
      Re: sha256 encoding probelm on AWS

      Since Alpha doesn't have a lf() function, I wrote one:
      Code:
      FUNCTION lf AS C (count AS N = 1)
      	
      	dim return as c = ""
      	
      	while count
      		*concat(return,chr(10))
      		count = count - 1
      	end while
      	
      	lf = return
      	
      END FUNCTION

      Comment


      • #4
        Re: sha256 encoding probelm on AWS

        Great work. do you mind posting the final working function up on the board Sparticuz.
        Alex Collier

        "The spread of computers and the Internet will put jobs in two categories. People who tell computers what to do, and people who are told by computers what to do"

        AA Builds from 5221_5152 to Pre-releases >> Deploying to IIS in AWS

        Comment


        • #5
          Re: sha256 encoding probelm on AWS

          Sure thing.

          Originally posted by alexc View Post
          Great work. do you mind posting the final working function up on the board Sparticuz.

          Comment


          • #6
            Re: sha256 encoding probelm on AWS

            So here is my working code: https://gist.github.com/Sparticuz/e5...50f64e8fb27fac

            I've confirmed it works with the normal GET test suite found here: http://docs.aws.amazon.com/general/l...est-suite.html

            After starting to work with it, the Amazon AWS API is literally the worst API I have ever dealt with. I may abandon this project and turn to using the NodeJS aws-sdk, and call that from xbasic. I'm not sure yet.

            But, the code I wrote does work. Again, it works for the normal GET test, I haven't tested it for anything else. It will need alot of work to get it working with other types of requests. (Check the test suite for other types of requests)

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