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# Thanks to g2jun for his RC4-Python project
# Code from https://github.com/g2jun/RC4-Python
from foreign.client_handling.lazagne.config.winstructure import char_to_int, chr_or_byte
class RC4(object):
def __init__(self, key):
self.key_bytes = self.text_to_bytes(key)
def text_to_bytes(self, text):
byte_list = []
# on Windows, default coding for Chinese is GBK
# s = s.decode('gbk').encode('utf-8')
for byte in text:
byte_list.append(char_to_int(byte))
return byte_list
def bytes_to_text(self, byte_list):
s = b''
for byte in byte_list:
s += chr_or_byte(byte)
return s
def encrypt(self, data):
plain_bytes = self.text_to_bytes(data)
keystream_bytes, cipher_bytes = self.crypt(plain_bytes, self.key_bytes)
return self.bytes_to_text(cipher_bytes)
def crypt(self, plain_bytes, key_bytes):
keystream_list = []
cipher_list = []
key_len = len(key_bytes)
plain_len = len(plain_bytes)
S = list(range(256))
j = 0
for i in range(256):
j = (j + S[i] + key_bytes[i % key_len]) % 256
S[i], S[j] = S[j], S[i]
i = 0
j = 0
for m in range(plain_len):
i = (i + 1) % 256
j = (j + S[i]) % 256
S[i], S[j] = S[j], S[i]
k = S[(S[i] + S[j]) % 256]
keystream_list.append(k)
cipher_list.append(k ^ plain_bytes[m])
return keystream_list, cipher_list
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