趣学python3(45)--调用C库-加解密

cryptography库既包括高级规则，也包括普通密码算法(如对称密码、消息摘要和关键派生函数)的低级接口。

$ pip install cryptography
例如，用密码学的高层对称加密方式加密:

from cryptography.fernet import Fernet
key = Fernet.generate_key()
f = Fernet(key)
token = f.encrypt(b"hello,world!")
print token
print key
'...'
print f.decrypt(token)

gAAAAABbzaV91tfQiIYclT05Kb30uA6-XDKsp13jHx7lpIvML3NHCtJCxqTIgArIqQgTocnsBanR51vDkeh5NcDkN_B2kL2bDA==
tbpwFLqSZFa6Tufae7JW5gqrxGPQFtRCrfl-gyDIuiw=
hello,world!
AES :

 import osfrom cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modesfrom cryptography.hazmat.backends import default_backendfrom cryptography.hazmat.primitives import paddingpadder = padding.PKCS7(128).padder()backend = default_backend()key = os.urandom(32)iv = os.urandom(16)cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)encryptor = cipher.encryptor()
padded_data = padder.update(b"liuxing")
padded_data += padder.finalize()
print padded_data
ct = encryptor.update(padded_data) + encryptor.finalize()
decryptor = cipher.decryptor()
decryptorData=decryptor.update(ct) + decryptor.finalize()
unpadder = padding.PKCS7(128).unpadder()
data = unpadder.update(decryptorData)
data + unpadder.finalize()
liuxing

Out[22]:‘liuxing’

   #!/usr/bin/env python2# -*- coding: utf-8 -*-import osfrom cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modesfrom cryptography.hazmat.backends import default_backendfrom cryptography.hazmat.primitives import paddingpadder = padding.PKCS7(128).padder()backend = default_backend()key = os.urandom(32)iv = os.urandom(16)cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)encryptor = cipher.encryptor()messages = raw_input("Please input your message: ")padded_data = padder.update(messages )padded_data += padder.finalize()print padded_datact = encryptor.update(padded_data) + encryptor.finalize()decryptor = cipher.decryptor()decryptorData=decryptor.update(ct) + decryptor.finalize()unpadder = padding.PKCS7(128).unpadder()data = unpadder.update(decryptorData)data + unpadder.finalize()

Please input your message: hello, world,I am a teacher.
hello, world,I am a teacher.
Out[24]:
‘hello, world,I am a teacher.’
python3:

#!/usr/bin/env python2
# -*- coding: utf-8 -*-import os
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding
padder = padding.PKCS7(128).padder()
backend = default_backend()
key = os.urandom(32)
iv = os.urandom(16)
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
encryptor = cipher.encryptor()
messages = input("Please input your message: ")
messages=bytes(messages,"utf-8")
padded_data = padder.update(messages )
padded_data += padder.finalize()
print(padded_data)
ct = encryptor.update(padded_data) + encryptor.finalize()
decryptor = cipher.decryptor()
decryptorData=decryptor.update(ct) + decryptor.finalize()
unpadder = padding.PKCS7(128).unpadder()
data = unpadder.update(decryptorData)
print(data + unpadder.finalize())

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