topic Re: Python code for fingerprint generation in Integration and Testing

Python code for fingerprint generation

gpetty — Sat, 26 Mar 2016 02:50:51 GMT

Using PHP for a transaction posted to the SIM gateway, fingerprint generation is based on the following function:

function hmac ($key, $data)
{
return (bin2hex (mhash(MHASH_MD5, $data, $key)));
}

Not being very familiar with either PHP or hash functions, I'm hoping someone can tell me what the equivalent Python code is to generate a valid fingerprint (presumably using the hashlib module).

Re: Python code for fingerprint generation

gpetty — Sat, 26 Mar 2016 03:38:51 GMT

After considerable trial and error, I find that the following appears to produce the same output as the PHP version:

import hmac
def HMAC(key,data):
return(hmac.new(data,key).hexdigest())

Re: Python code for fingerprint generation

gpetty — Mon, 28 Mar 2016 14:26:42 GMT

The code posted previously needs to be corrected to reverse the order of the arguments to hmac.new(). The following is what I'm now using successfully in my Python-based interface to the gateway:

import hmac
def HMAC(key,data):
    return(hmac.new(key,data).hexdigest())