python rc4

明明RC4没写错，就是连不上服务器，来回检查了十几次，晕死，贴测试用例吧

输入是key，需要编码的文字是plaintext，输出的HEX String 应该是out

# key = 'Key'# plaintext = 'Plaintext'# out = BBF316E8D940AF0AD3# key = 'Wiki'# plaintext = 'pedia'# out = 1021BF0420#key = 'Secret'#plaintext = 'Attack at dawn'#out 45A01F645FC35B383552544B9BF5

implement 1

class RC4(object):    def __init__(self, key=bytearray(0)):        self.S = bytearray(256)        self.T = bytearray(256)        self.key_length = 0        self.i = 0        self.j = 0        self.k = 0        self.t = 0        self.tmp = bytes()        if len(key) < 1 or len(key) > 256:            raise ValueError('key len should not be %d' % len(key))        else:            self.key_length = len(key)            for i in range(256):                self.S[i] = i                self.T[i] = key[i % self.key_length]            j = 0            for i in range(256):                j = (j + self.S[i] + self.T[i]) & 0xFF                tmp = self.S[j]                self.S[j] = self.S[i]                self.S[i] = tmp    def flip(self, plaintext, offset, length):        cipher = bytearray(length)        for counter in range(length):            self.i = (self.i + 1) & 0xFF            self.j = (self.j + self.S[self.i]) & 0xFF            self.tmp = self.S[self.j]            self.S[self.j] = self.S[self.i]            self.S[self.i] = self.tmp            self.t = (self.S[self.i] + self.S[self.j]) & 0xFF            self.k = self.S[self.t]            cipher[counter] = plaintext[counter + offset] ^ self.k        return cipher

implement 2

from Crypto.Cipher import ARC4class RCC4(object):    def __init__(self, rc4_key):        self._rc4_cipher = ARC4.new(rc4_key)    def flip(self, plaintext):        return self._rc4_cipher.encrypt(plaintext)

test

if __name__ == "__main__":    key = "Key"    plaintext = 'Plaintext'    te = RC4(bytearray(key))    td = RC4(bytearray(key))    # encode    transfer = te.flip(bytearray(plaintext), 0, len(plaintext))    # decode    out = td.flip(transfer, 0, len(transfer))    print "%s %s" % (plaintext[3], chr(out[3]))    tte = RCC4(key)    ttd = RCC4(key)    # encode    t_transfer = tte.flip(plaintext)    # encode    t_out = bytearray(ttd.flip(t_transfer))    print "%s %s" % (plaintext[3], chr(t_out[3]))