我试图使用PyCrypto构建两个函数，它们接受两个参数:消息和密钥，然后加密/解密消息。
我在网上找到了几个链接来帮助我，但每一个都有缺陷:
codekoala的这个使用os。这是PyCrypto不鼓励的。
此外，我给函数的键不能保证具有预期的确切长度。我要怎么做才能做到呢?
还有，有几种模式，推荐哪种模式?我不知道用什么:/
最后，静脉注射到底是什么?我是否可以提供不同的IV来加密和解密，或者这将返回不同的结果?
当前回答
PyCrypto已经过时了。
如今，密码学有了更好的支持。
这是另一个实现。注意，这将返回字节，您需要使用base64将它们转换为用于传输的字符串。
import os
import hashlib
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
_BLOCK_SIZE = 16
class AesStringCipher:
def __init__(self, key):
self._key = hashlib.sha256(key.encode()).digest()
def encrypt_str(self, raw:str) -> bytes:
iv = os.urandom(_BLOCK_SIZE)
cipher = Cipher(algorithms.AES(self._key), modes.CBC(iv), default_backend())
encryptor = cipher.encryptor()
raw = _pad(raw)
return iv + encryptor.update(raw.encode('utf-8')) + encryptor.finalize()
def decrypt_str(self, enc:bytes) -> str:
iv = enc[:_BLOCK_SIZE]
enc = enc[_BLOCK_SIZE:]
cipher = Cipher(algorithms.AES(self._key), modes.CBC(iv), default_backend())
decryptor = cipher.decryptor()
raw = decryptor.update(enc) + decryptor.finalize()
raw = raw.decode('utf-8')
return _unpad(raw)
def _pad(s:str) -> str:
padding = (_BLOCK_SIZE - (len(s) % _BLOCK_SIZE))
return s + padding * chr(padding)
def _unpad(s:str) -> str:
return s[:-ord(s[len(s)-1:])]
if __name__ == '__main__':
cipher = AesStringCipher('my secret password')
secret_msg = 'this is a super secret msg ...'
enc_msg = cipher.encrypt_str(secret_msg)
dec_msg = cipher.decrypt_str(enc_msg)
assert secret_msg == dec_msg
其他回答
你可以使用新的django-mirage-field包。
我用过Crypto和PyCryptodomex库，它非常快…
import base64
import hashlib
from Cryptodome.Cipher import AES as domeAES
from Cryptodome.Random import get_random_bytes
from Crypto import Random
from Crypto.Cipher import AES as cryptoAES
BLOCK_SIZE = AES.block_size
key = "my_secret_key".encode()
__key__ = hashlib.sha256(key).digest()
print(__key__)
def encrypt(raw):
BS = cryptoAES.block_size
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
raw = base64.b64encode(pad(raw).encode('utf8'))
iv = get_random_bytes(cryptoAES.block_size)
cipher = cryptoAES.new(key= __key__, mode= cryptoAES.MODE_CFB,iv= iv)
a= base64.b64encode(iv + cipher.encrypt(raw))
IV = Random.new().read(BLOCK_SIZE)
aes = domeAES.new(__key__, domeAES.MODE_CFB, IV)
b = base64.b64encode(IV + aes.encrypt(a))
return b
def decrypt(enc):
passphrase = __key__
encrypted = base64.b64decode(enc)
IV = encrypted[:BLOCK_SIZE]
aes = domeAES.new(passphrase, domeAES.MODE_CFB, IV)
enc = aes.decrypt(encrypted[BLOCK_SIZE:])
unpad = lambda s: s[:-ord(s[-1:])]
enc = base64.b64decode(enc)
iv = enc[:cryptoAES.block_size]
cipher = cryptoAES.new(__key__, cryptoAES.MODE_CFB, iv)
b= unpad(base64.b64decode(cipher.decrypt(enc[cryptoAES.block_size:])).decode('utf8'))
return b
encrypted_data =encrypt("Hi Steven!!!!!")
print(encrypted_data)
print("=======")
decrypted_data = decrypt(encrypted_data)
print(decrypted_data)
PyCrypto已经过时了。
如今，密码学有了更好的支持。
这是另一个实现。注意，这将返回字节，您需要使用base64将它们转换为用于传输的字符串。
import os
import hashlib
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
_BLOCK_SIZE = 16
class AesStringCipher:
def __init__(self, key):
self._key = hashlib.sha256(key.encode()).digest()
def encrypt_str(self, raw:str) -> bytes:
iv = os.urandom(_BLOCK_SIZE)
cipher = Cipher(algorithms.AES(self._key), modes.CBC(iv), default_backend())
encryptor = cipher.encryptor()
raw = _pad(raw)
return iv + encryptor.update(raw.encode('utf-8')) + encryptor.finalize()
def decrypt_str(self, enc:bytes) -> str:
iv = enc[:_BLOCK_SIZE]
enc = enc[_BLOCK_SIZE:]
cipher = Cipher(algorithms.AES(self._key), modes.CBC(iv), default_backend())
decryptor = cipher.decryptor()
raw = decryptor.update(enc) + decryptor.finalize()
raw = raw.decode('utf-8')
return _unpad(raw)
def _pad(s:str) -> str:
padding = (_BLOCK_SIZE - (len(s) % _BLOCK_SIZE))
return s + padding * chr(padding)
def _unpad(s:str) -> str:
return s[:-ord(s[len(s)-1:])]
if __name__ == '__main__':
cipher = AesStringCipher('my secret password')
secret_msg = 'this is a super secret msg ...'
enc_msg = cipher.encrypt_str(secret_msg)
dec_msg = cipher.decrypt_str(enc_msg)
assert secret_msg == dec_msg
这是另一种观点(主要源自上述解决方案)，但是
uses null for padding does not use lambda (never been a fan) tested with python 2.7 and 3.6.5 #!/usr/bin/python2.7 # you'll have to adjust for your setup, e.g., #!/usr/bin/python3 import base64, re from Crypto.Cipher import AES from Crypto import Random from django.conf import settings class AESCipher: """ Usage: aes = AESCipher( settings.SECRET_KEY[:16], 32) encryp_msg = aes.encrypt( 'ppppppppppppppppppppppppppppppppppppppppppppppppppppppp' ) msg = aes.decrypt( encryp_msg ) print("'{}'".format(msg)) """ def __init__(self, key, blk_sz): self.key = key self.blk_sz = blk_sz def encrypt( self, raw ): if raw is None or len(raw) == 0: raise NameError("No value given to encrypt") raw = raw + '\0' * (self.blk_sz - len(raw) % self.blk_sz) raw = raw.encode('utf-8') iv = Random.new().read( AES.block_size ) cipher = AES.new( self.key.encode('utf-8'), AES.MODE_CBC, iv ) return base64.b64encode( iv + cipher.encrypt( raw ) ).decode('utf-8') def decrypt( self, enc ): if enc is None or len(enc) == 0: raise NameError("No value given to decrypt") enc = base64.b64decode(enc) iv = enc[:16] cipher = AES.new(self.key.encode('utf-8'), AES.MODE_CBC, iv ) return re.sub(b'\x00*$', b'', cipher.decrypt( enc[16:])).decode('utf-8')
我很感激其他启发我的答案，但它们对我不起作用。
在花了几个小时试图弄清楚它是如何工作的之后，我用最新的PyCryptodomex库提出了下面的实现(这是另一个故事，我如何设法在代理后面设置它，在Windows上，在virtualenv中…唷)
它正在处理您的实现。记得写下填充、编码和加密步骤(反之亦然)。你必须打包和拆包，记住顺序。
import base64
import hashlib
from Cryptodome.Cipher import AES
from Cryptodome.Random import get_random_bytes
__key__ = hashlib.sha256(b'16-character key').digest()
def encrypt(raw):
BS = AES.block_size
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
raw = base64.b64encode(pad(raw).encode('utf8'))
iv = get_random_bytes(AES.block_size)
cipher = AES.new(key= __key__, mode= AES.MODE_CFB,iv= iv)
return base64.b64encode(iv + cipher.encrypt(raw))
def decrypt(enc):
unpad = lambda s: s[:-ord(s[-1:])]
enc = base64.b64decode(enc)
iv = enc[:AES.block_size]
cipher = AES.new(__key__, AES.MODE_CFB, iv)
return unpad(base64.b64decode(cipher.decrypt(enc[AES.block_size:])).decode('utf8'))
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