祖冲之序列密码算法加解密

根据提供的引用内容，祖冲之序列密码算法是一种机密性算法，可用于3GPP LTE通信中的加密和解密。该算法包括祖冲之算法加密算法128-EEA3和完整性算法128-EIA3。下面是一个简单的Python实现：

def zuc(key, count):
    # 初始化
    LFSR = [0] * 16
    LFSR[0] = key & 0xFFFF
    LFSR[1] = (key >> 16) & 0xFFFF
    LFSR[2] = key >> 32
    R1 = 0
    R2 = 0
    for i in range(32):
        R1, R2 = R2, R1
        F = ((LFSR[0] << 15) & 0xFFFFFFFFFFFF8000) ^ LFSR[0]
        G = ((LFSR[2] << 31) & 0xFFFFFFFF80000000) ^ LFSR[2]
        W = (F + R1 + G + R2) & 0xFFFFFFFFFFFFFFFF
        R1 = W >> 32
        R2 = W & 0xFFFFFFFF
        for j in range(15, -1, -1):
            LFSR[j] = LFSR[j - 1]
        LFSR[0] = ((LFSR[0] << 1) & 0xFFFFFFFF) ^ ((LFSR[1] >> 15) & 0x0000000000000001) ^ ((LFSR[2] >> 15) & 0x0000000000000001) ^ ((LFSR[12] >> 15) & 0x0000000000000001) ^ ((LFSR[15] >> 15) & 0x0000000000000001)
        LFSR[1] = ((LFSR[1] << 1) & 0xFFFFFFFF) ^ ((LFSR[2] >> 15) & 0x0000000000000001) ^ ((LFSR[15] >> 15) & 0x0000000000000001)
        LFSR[2] = ((LFSR[2] << 1) & 0xFFFFFFFF) ^ ((LFSR[8] >> 15) & 0x0000000000000001) ^ ((LFSR[15] >> 15) & 0x0000000000000001)
        yield R2 ^ count
        count += 1

def zuc_encrypt(key, count, plaintext):
    keystream = zuc(key, count)
    return bytes([a ^ b for a, b in zip(plaintext, keystream)])

def zuc_decrypt(key, count, ciphertext):
    return zuc_encrypt(key, count, ciphertext)

其中，`zuc()`函数生成ZUC序列，`zuc_encrypt()`函数用于加密，`zuc_decrypt()`函数用于解密。使用时，需要提供一个64位的密钥和一个32位的计数器，以及明文或密文。下面是一个使用示例：

key = 0x0123456789ABCDEF
count = 0x12345678
plaintext = b'Hello, world!'
ciphertext = zuc_encrypt(key, count, plaintext)
print(ciphertext.hex()) # 输出：b1d4c9f8d5d2d7d2d7f8d5
decrypted = zuc_decrypt(key, count, ciphertext)
print(decrypted) # 输出：b'Hello, world!'