自己编写ZUC算法(C++)
时间: 2023-06-17 12:04:52 浏览: 58
以下是一个简单的ZUC算法的C++实现:
```c++
#include <iostream>
#include <cstring>
using namespace std;
unsigned char S[256] = { 0 };
unsigned char T[256] = { 0 };
unsigned char LFSR_S[16] = { 0 };
unsigned char LFSR_R[16] = { 0 };
unsigned char F_R[4] = { 0 };
unsigned char F_B[4] = { 0 };
unsigned char F_C[4] = { 0 };
unsigned char F_D[4] = { 0 };
unsigned char F_E[4] = { 0 };
unsigned char F_F[4] = { 0 };
unsigned char F_G[4] = { 0 };
unsigned char F_H[4] = { 0 };
unsigned char W[16] = { 0 };
void ZUC_Init(unsigned char *key, unsigned char *iv)
{
int i, j;
unsigned char K[16] = { 0 };
unsigned char IV[16] = { 0 };
unsigned char B0[16] = { 0 };
unsigned char B1[16] = { 0 };
memcpy(K, key, 16);
memcpy(IV, iv, 16);
for (i = 0; i < 16; i++)
{
B0[i] = IV[i] ^ 0x5c;
B1[i] = IV[i] ^ 0x36;
}
for (i = 0; i < 32; i++)
{
for (j = 0; j < 16; j++)
{
LFSR_R[j] ^= K[j];
}
for (j = 0; j < 16; j++)
{
F_R[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_B[j] = S[F_R[j] & 0xff];
}
for (j = 0; j < 16; j++)
{
F_C[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_D[j] = S[(F_C[j] + 1) & 0xff];
}
for (j = 0; j < 16; j++)
{
F_E[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_F[j] = S[(F_E[j] + 2) & 0xff];
}
for (j = 0; j < 16; j++)
{
F_G[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_H[j] = S[(F_G[j] + 3) & 0xff];
}
for (j = 0; j < 16; j++)
{
LFSR_S[j] ^= F_B[j % 4] ^ F_D[j % 4] ^ F_F[j % 4] ^ F_H[j % 4] ^ B1[j % 16];
}
for (j = 0; j < 16; j++)
{
F_R[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_B[j] = S[F_R[j] & 0xff];
}
for (j = 0; j < 16; j++)
{
F_C[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_D[j] = S[(F_C[j] + 1) & 0xff];
}
for (j = 0; j < 16; j++)
{
F_E[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_F[j] = S[(F_E[j] + 2) & 0xff];
}
for (j = 0; j < 16; j++)
{
F_G[j % 4] ^= LFSR_R[j];
}
for (j = 0; j < 4; j++)
{
F_H[j] = S[(F_G[j] + 3) & 0xff];
}
for (j = 0; j < 16; j++)
{
LFSR_R[j] ^= F_B[j % 4] ^ F_D[j % 4] ^ F_F[j % 4] ^ F_H[j % 4] ^ B0[j % 16];
}
}
for (i = 0; i < 16; i++)
{
W[i] = LFSR_S[i] ^ LFSR_R[i];
}
}
void ZUC_Encrypt(unsigned char *data, int len)
{
int i, j;
unsigned char D[16] = { 0 };
unsigned char B[16] = { 0 };
unsigned char C[16] = { 0 };
unsigned char E[16] = { 0 };
unsigned char F[16] = { 0 };
unsigned char G[16] = { 0 };
unsigned char H[16] = { 0 };
unsigned char K[16] = { 0 };
unsigned char M[4] = { 0 };
for (i = 0; i < len; i += 4)
{
M[0] = data[i];
M[1] = data[i + 1];
M[2] = data[i + 2];
M[3] = data[i + 3];
for (j = 0; j < 16; j++)
{
K[j] = W[j] ^ (i + j) % 256;
}
for (j = 0; j < 16; j++)
{
B[j] = S[K[j] ^ M[j % 4]];
}
for (j = 0; j < 16; j++)
{
C[j % 4] ^= B[j];
}
for (j = 0; j < 4; j++)
{
D[j] = S[(C[j] + 1) & 0xff];
}
for (j = 0; j < 16; j++)
{
E[j % 4] ^= K[j];
}
for (j = 0; j < 4; j++)
{
F[j] = S[(E[j] + 2) & 0xff];
}
for (j = 0; j < 16; j++)
{
G[j % 4] ^= K[j];
}
for (j = 0; j < 4; j++)
{
H[j] = S[(G[j] + 3) & 0xff];
}
for (j = 0; j < 16; j++)
{
M[j % 4] ^= B[j] ^ D[j % 4] ^ F[j % 4] ^ H[j % 4];
}
data[i] = M[0];
data[i + 1] = M[1];
data[i + 2] = M[2];
data[i + 3] = M[3];
for (j = 0; j < 16; j++)
{
C[j % 4] ^= B[j];
}
}
}
int main()
{
unsigned char key[16] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10 };
unsigned char iv[16] = { 0x3d, 0xaf, 0xba, 0x42, 0x9c, 0xd0, 0x05, 0x3e, 0x02, 0x4c, 0x87, 0x5c, 0x2a, 0x5d, 0x1b, 0x4c };
unsigned char data[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff };
int i;
for (i = 0; i < 256; i++)
{
S[i] = i;
}
for (i = 0; i < 256; i++)
{
T[i] = key[i % 16];
}
for (i = 0; i < 256; i++)
{
int j = (j + S[i] + T[i]) % 256;
swap(S[i], S[j]);
}
ZUC_Init(key, iv);
ZUC_Encrypt(data, 16);
for (i = 0; i < 16; i++)
{
printf("%02x ", data[i]);
}
printf("\n");
return 0;
}
```
在这个实现中,我们首先通过将S数组初始化为0到255的连续整数,同时使用密钥和IV生成T数组,然后使用T数组对S数组进行置换,生成一个初始状态。接下来,我们使用ZUC_Init函数使用密钥和IV初始化LFSR_S、LFSR_R和W数组。然后,我们可以使用ZUC_Encrypt函数将数据加密。对于每个4字节的数据块,我们使用W数组和数据块的索引生成一个密钥K。然后,我们使用密钥K和数据块中的每个字节,以及一些状态变量,计算出加密后的字节。最后,我们将加密后的字节存储回原始数据数组中。