Dear Sven,First of all thank you for your prompt reply.I will try and include the information you have requested.The SHA256 implementation comes from here http://smalltalkhub.com/#!/~Cryptography/Cryptography and I loaded only the latest version of Cryptography into a fresh pharo 2.0 image, and nothing else.I need this hmacsha256 encryption for a rest implementation I am trying out, for which I have a VB implementation and I get the correct values for both sets of data.It seems that the SHA256 (encodedSignature) hex value is correct on both occasions and the base64 encodedForHTTP value for the apiKey := '123456789' is also correct, but for the case where apiKey := 'veQC+IBLq5qMO8oGcQupjg==' I get the base64 encodedForHTTP value of 'AcTXF%2BlDa2kRYVm0k5jY6pGGTMXD7NsQS6tLBXRp3Xs%3D' where I should get '%2B%2FYhVkcaEIHBeUESOsJYD1nKyJXVGyFX%2FlxR616aUK4%3D'.The two sets of testing code are:1) Produces correct result.apiKey := '123456789'.unsignedSignature := 'pharmacistprescriptionsget000001'.encodedSignature := (SHA256 new) hmac key: apiKey asByteArray; digestMessage: unsignedSignature asByteArray.encodedSignature base64Encoded encodeForHTTP.2)apiKey := 'veQC+IBLq5qMO8oGcQupjg=='.userName := 'testpharm'.barCode :='1403122014500'.unsignedSignature := userName,'prescriptionsgetexecuted',barCode.encodedSignature := (SHA256 new) hmac key: apiKey asByteArray; digestMessage: unsignedSignature asByteArray.encodedSignature base64Encoded encodeForHTTP.Is the above enough?Regards,Spilios
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