python3 实现rc4 加密 ##实现rc4库 非常简洁，看代码吧 ```python import base64 import hashlib import os from io import BytesIO class RC4(object): def __init__(self, key=None): self.key = hashlib.md5(key.encode("utf-8")).hexdigest() def encode(self, in_stream, out_stream): sbox = self.sbox() while 1: chunk = in_stream.read(8) if not chunk: break out_chuck = bytearray() for bt in chunk: out_chuck.append(bt ^ next(sbox)) out_stream.write(bytes(out_chuck)) def sbox(self): keylength = len(self.key) s = list(range(256)) # init S box j = 0 for i in range(255): j = (j + s[i] + ord(self.key[i % keylength])) % 256 s[i], s[j] = s[j], s[i] i = 0 j = 0 while 1: i = (i + 1) % 256 j = (j + s[i]) % 256 s[i], s[j] = s[j], s[i] yield s[(s[i] + s[j]) % 256] def encrypt(in_stream: BytesIO, out_stream: BytesIO, pwd: str): rc4_cryptor = RC4(pwd) rc4_cryptor.encode(in_stream, out_stream) def encrypt_str(data: str, pwd: str): in_stream = BytesIO() out_stream = BytesIO() data_bytes = data.encode("utf-8") # 引入随机IV打乱原文 iv = os.urandom(1)[0] tp_v = iv data_xor_iv = bytearray() for bt in data_bytes: data_xor_iv.append(bt ^ tp_v) tp_v = bt ^ tp_v in_stream.write(data_xor_iv) in_stream.seek(0) encrypt(in_stream, out_stream, pwd) enc_bytes = bytes([iv]) + out_stream.getvalue() b64_str = base64.urlsafe_b64encode(enc_bytes) return b64_str.decode("utf-8") def decrypt_str(data: str, pwd: str): data_bytes = base64.urlsafe_b64decode(data) in_stream = BytesIO() out_stream = BytesIO() iv = data_bytes[:1][0] in_stream.write(data_bytes[1:]) in_stream.seek(0) encrypt(in_stream, out_stream, pwd) dec_bytes = out_stream.getvalue() data_xor_iv = bytearray() for bt in dec_bytes: data_xor_iv.append(bt ^ iv) iv = bt return data_xor_iv.decode('utf-8') if __name__ == "__main__": test_byte_data = "hello world 世界你好" ret = encrypt_str(test_byte_data, 'yzh') print(ret) ret = decrypt_str(ret, 'yzh') print(ret) assert test_byte_data == ret ret = encrypt_str("1#1500000000", 'yzh') print(ret, len(ret)) ret = encrypt_str("111111#1500000000", 'yzh') print(ret, len(ret)) ret = encrypt_str("99999999#1500000000", 'yzh') print(ret, len(ret)) ``` 来自 大脸猪 写于 2017-01-24 15:59 -- 更新于2020-10-19 13:06 -- 0 条评论