Python implements certificate free encryption and decryption instances

The example of this article describes the python implementation of certificate-free encryption and decryption method, to share with you for your reference. The specific implementation method is as follows:

No certificate encryption is the two sides do not need to maintain, and a key encryption and decryption only need the two sides can, without certificate encryption method used more widely, python official also have this aspect of the relevant examples, the address is: https://pypi.python.org/pypi/pycrypto, mainly with the from Crypto. The Cipher import AES this module, the code is as follows:

'''

/**

* AES Encrypted string 

*

* @param string data  Encrypted string 

* @param string key  The key ( Can only be 16 , 24 , 32 position )

* @param string iv 16 Bit length vector 

* @param bool  Coding format ( true:base64 / false: Hexadecimal) 

* @return string  The encrypted result 

*/

'''

def encrypt_mode_cbc(data, key, iv = 'www.jb51.net!!', base64 = True):

lenth = len(data)

num = lenth % 16

data = data.ljust(lenth + 16 - num)

obj = AES.new(key, AES.MODE_CBC, iv)

result = obj.encrypt(data)

return result.encode('base64') if base64 is True else result.encode('hex')

encrypt = encrypt_mode_cbc('hello geekso', 'www.jb51.net!!')

print encrypt

'''

/**

* AES Decrypt string 

*

* @param string encrypted  String to be decrypted 

* @param string key  The key 

* @param string iv 16 Bit length vector 

* @param bool  Encoding ( true:base64 / false: Hexadecimal) 

* @return string  Decrypted results  or bool

*/

'''

def decrypt_mode_cbc(encrypted, key, iv = 'www.jb51.net!!', base64 = True):

encrypted = encrypted.decode('base64') if base64 is True else encrypted.decode('hex')

if encrypted is not '':

obj = AES.new(key, AES.MODE_CBC, iv)

return obj.decrypt(encrypted)

else:

return False
print decrypt_mode_cbc(encrypt,'www.jb51.net!!')

exit()

I hope this article has helped you with your Python programming.