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[Source] .NET version of Tenpay payment interface sign encryption method

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Posted on 1/14/2016 5:00:46 PM | | | |





MD5 is a summary generation algorithm that performs MD5 operations by adding the content of the merchant's communication key after the original string is signed, and the resulting summary string is the signature result. For easy comparison, the signature results are uniformly converted to uppercase characters.
MD5 signature calculation formula:
sign = MD5 (original string & key = merchant key). toUpperCase
As:
        The original string of signatures is: input_charset=GBK&partner=1900000109&total_fee=1
The merchant key is: 8db4a013a8b515349c307f1e448ce836
The result of the signature is:
sign=md5(input_charset=GBK&partner=1900000109&total_fee=1&key=8934e7d15453e97507ef794cf7b0519d)= 8DB4A013A8B515349C307F1E448CE836


However, I still have an invalid signature, I don't know where the problem is




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