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Can someone please point out mistakes in this code:

 __author__="gaurav" __date__ ="$15 Feb, 2011 5:10:59 PM$" import M2Crypto from base64 import b64encode, b64decode ENC=1 DEC=0 def AES_build_cipher(key, iv, op=ENC): """""""" return M2Crypto.EVP.Cipher(alg='aes_128_cbc', key=key, iv=iv, op=op) def AES_encryptor(key,msg, iv=None): """""" #Decode the key and iv key = b64decode(key) if iv is None: iv = '\0' * 16 else: iv = b64decode(iv) # Return the encryption function def encrypt(data): cipher = AES_build_cipher(key, iv, ENC) v = cipher.update(data) v = v + cipher.final() del cipher v = b64encode(v) return v print "AES encryption successful\n" return encrypt(msg) def AES_decryptor(key,msg, iv=None): """""" #Decode the key and iv key = b64decode(key) if iv is None: iv = '\0' * 16 else: iv = b64decode(iv) # Return the decryption function def decrypt(data): data = b64decode(data) cipher = AES_build_cipher(key, iv, DEC) v = cipher.update(data) v = v + cipher.final() del cipher return v print "AES dencryption successful\n" return decrypt(msg) if __name__ == "__main__": msg=AES_encryptor(b64encode("123452345"),msg=b64encode("qwrtttrtyutyyyyy")) print AES_decryptor(b64encode("123452345"),msg=msg)

Error:

 AES encryption successful AES dencryption successful Traceback (most recent call last): File "/home/gaurav/NetBeansProjects/temp/src/temp.py", line 54, in <module> print AES_decryptor(b64encode("123452345"),msg) File "/home/gaurav/NetBeansProjects/temp/src/temp.py", line 51, in AES_decryptor return decrypt(iv) File "/home/gaurav/NetBeansProjects/temp/src/temp.py", line 47, in decrypt v = v + cipher.final() File "/usr/local/lib/python2.6/dist-packages/M2Crypto-0.21.1-py2.6-linux-i686.egg/M2Crypto/EVP.py", line 128, in final return m2.cipher_final(self.ctx) M2Crypto.EVP.EVPError: wrong final block length
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  • Something is wrong in your setup. I run your code, it did work without any errors. Commented May 24, 2011 at 6:45

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After correcting the indentation and a small change in __main__, your code seems to work with Python 2.7.3 and M2Crypto-0.21.1:

__author__="gaurav" __date__ ="$15 Feb, 2011 5:10:59 PM$" import M2Crypto from base64 import b64encode, b64decode ENC=1 DEC=0 def AES_build_cipher(key, iv, op=ENC): """""""" return M2Crypto.EVP.Cipher(alg='aes_128_cbc', key=key, iv=iv, op=op) def AES_encryptor(key,msg, iv=None): """""" #Decode the key and iv key = b64decode(key) if iv is None: iv = '\0' * 16 else: iv = b64decode(iv) # Return the encryption function def encrypt(data): cipher = AES_build_cipher(key, iv, ENC) v = cipher.update(data) v = v + cipher.final() del cipher v = b64encode(v) return v print "AES encryption successful\n" return encrypt(msg) def AES_decryptor(key,msg, iv=None): """""" #Decode the key and iv key = b64decode(key) if iv is None: iv = '\0' * 16 else: iv = b64decode(iv) # Return the decryption function def decrypt(data): data = b64decode(data) cipher = AES_build_cipher(key, iv, DEC) v = cipher.update(data) v = v + cipher.final() del cipher return v print "AES decryption successful\n" return decrypt(msg) if __name__ == "__main__": key="123452345" msg="qwrtttrtyutyyyyy" encrypted_msg=AES_encryptor(b64encode(key),b64encode(msg)) print b64decode(AES_decryptor(b64encode(key),encrypted_msg))
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