How to implement MAC_X919 algorithm in Python
22 Mar 2011 
Matteo Mattei 
python 
0 Comments Today with my friend Nicola, we were looking in Internet for the implementation of the X9.19 algorithm in Python. Unfortunately we didn’t find it anywhere, so we made it ourself:
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| #!/usr/bin/env python2 | |
| import Crypto.Cipher.DES as des | |
| import Crypto.Cipher.DES3 as des3 | |
| def mac_x919(key,data): | |
| while len(data) % 8 != 0: | |
| data += '\x00' | |
| des_key1 = des.new(key[0:8],des.MODE_CBC) | |
| des_key2 = des.new(key[0:8],des.MODE_ECB) | |
| buf = des_key1.encrypt(data) | |
| buf = buf[len(buf)-8:] | |
| buf = des_key2.decrypt(buf) | |
| des3_key = des3.new(key,des3.MODE_ECB) | |
| buf = des3_key.encrypt(buf) | |
| return buf[0:4] | |
| mac = mac_x919('0123456789abcdef','test data to be encrypted') |