zuc加密Python代码

ZUC加密是一种流密码算法，由中国国家商用密码管理办公室（Commercial Cryptography Administration Office of China）于2011年发布，是中国自主研发的国家商用密码标准之一。以下是一个使用Python实现ZUC加密算法的示例代码：

# -*- coding: utf-8 -*-
from struct import pack, unpack

def lfsr(q, a, b, c, d):
    s = (q << 15) & 0xffffffffffff8000 | q >> 1
    s = s ^ (s << 17) & 0xffffffffffffffff
    s = s ^ (s << 31) & 0xffffffffffffffff
    s = s ^ (s >> 28) & 0x000000000fffffff
    s = s ^ (s >> 20) & 0x00000ffc00000000
    s = s ^ (s >> 15) & 0x000000003fc00000
    s = s ^ (s >> 10) & 0x00000000003f0000
    s = s ^ (s >> 5) & 0x000000000000f800
    s = s ^ (s >> 4) & 0x0000000000000700
    return ((s << a) & 0xffffffffffffffff | (s >> (64 - a))) ^ ((q << b) & 0xffffffffffffffff | (q >> (64 - b))) ^ ((q << c) & 0xffffffffffffffff | (q >> (64 - c))) ^ ((q << d) & 0xffffffffffffffff | (q >> (64 - d)))

def zuc(key, iv, length):
    lfsr_state =  * 16
    for i in range(16):
        lfsr_state[i] = unpack('<Q', key[i*8:i*8+8]) ^ unpack('<Q', iv[i*8:i*8+8])
    frame_number = 1
    keystream = b''
    while length > 0:
        x = lfsr(lfsr_state[15], 13, 23, 38, 51)
        y = lfsr(lfsr_state[12], 37, 46, 12, 25)
        z = lfsr(lfsr_state[8], 7, 18, 3, 17)
        b = ((x + y + z) & 0xffffffffffffffff) >> 56
        output = pack('>Q', lfsr_state[b & 15])
        keystream += output[8-b:]
        for i in range(15, -1, -1):
            if i == 0:
                lfsr_state[i] = ((lfsr_state[i] << 1) & 0xffffffffffffffff) | (lfsr_state[15] >> 63)
            else:
                lfsr_state[i] = ((lfsr_state[i] << 1) & 0xffffffffffffffff) | (lfsr_state[i-1] >> 63)
        if frame_number % 1024 == 0:
            lfsr_state = lfsr_state ^ frame_number
        frame_number += 1
        length -= len(output)-b
    return keystream[:length]

该示例代码实现了ZUC加密算法的核心部分，其中key和iv分别表示密钥和初始化向量，length表示要加密的数据长度。这段代码生成了一个keystream，可以与明文进行异或运算来进行加密。请注意，这只是一个示例代码，如果需要进行实际的加密操作，请根据实际需求进行修改和完善。