apppublic/appPublic/rc4.py

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# -*- coding: utf-8 -*-
import random, base64
from hashlib import sha1
class RC4:
def __init__(self,key='1234567890',data_coding='utf8'):
self.bcoding = 'iso-8859-1'
self.dcoding = data_coding
self.key = key.encode(self.bcoding)
self.salt = b'AFUqx9WZuI32lnHk'
def _crypt(self,data,key):
"""RC4 algorithm return bytes"""
if type(data)==type(''):
data = data.encode(self.dcoding)
x = 0
box = [i for i in range(256) ]
for i in range(256):
x = (x + box[i] + key[i % len(key)]) % 256
box[i], box[x] = box[x], box[i]
x = y = 0
out = []
for char in data:
x = (x + 1) % 256
y = (y + box[x]) % 256
box[x], box[y] = box[y], box[x]
out.append(chr(char ^ box[(box[x] + box[y]) % 256]))
return ''.join(out).encode(self.bcoding)
def encode(self,data, encode=base64.b64encode, salt_length=16):
"""RC4 encryption with random salt and final encoding"""
#salt = ''
#for n in range(salt_length):
# salt += chr(random.randrange(256))
#salt = salt.encode(self.bcoding)
a = sha1(self.key + self.salt)
k = a.digest()
data = self.salt + self._crypt(data, k)
if encode:
data = encode(data)
return data.decode(self.dcoding)
def decode(self,data, decode=base64.b64decode, salt_length=16):
"""RC4 decryption of encoded data"""
if decode:
data = decode(data)
salt = data[:salt_length]
a = sha1(self.key + self.salt)
k = a.digest() #.decode('iso-8859-1')
r = self._crypt(data[salt_length:], k)
return r.decode(self.dcoding)
if __name__=='__main__':
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# 需要加密的数据长度没有限制
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# 密钥
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data="231r3 feregrenerjk gkht324g8924gnfw k;ejkvwkjerv"
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key = '123456'
rc4 = RC4(key)
print(data)
# 加码
encoded_data = rc4.encode(data)
print(encoded_data,len(encoded_data) )
# 解码
decoded_data = rc4.decode(encoded_data)
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print(decoded_data)