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2025-09-03 15:40:10 +08:00
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/*
* Copyright (C) 2025. Institute of Information Engineering, CAS
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* @file: zuc256.c
* @brief: zuc256 的纯c代码
* @author: QZH <qinzhenghui@iie.ac.cn>
* @version: 1.0.0
* @date: 2025-09-01
*
* @note: 无
*
* Change Logs:
* Date Author Notes
* 2025-08-04 QZH 创建文件
*/
#include <stdlib.h>
#include <string.h>
#include "zuc256.h"
// S盒定义
static const uint8_t S0[256] = {
0x3e,0x72,0x5b,0x47,0xca,0xe0,0x00,0x33,0x04,0xd1,0x54,0x98,0x09,0xb9,0x6d,0xcb,
0x7b,0x1b,0xf9,0x32,0xaf,0x9d,0x6a,0xa5,0xb8,0x2d,0xfc,0x1d,0x08,0x53,0x03,0x90,
0x4d,0x4e,0x84,0x99,0xe4,0xce,0xd9,0x91,0xdd,0xb6,0x85,0x48,0x8b,0x29,0x6e,0xac,
0xcd,0xc1,0xf8,0x1e,0x73,0x43,0x69,0xc6,0xb5,0xbd,0xfd,0x39,0x63,0x20,0xd4,0x38,
0x76,0x7d,0xb2,0xa7,0xcf,0xed,0x57,0xc5,0xf3,0x2c,0xbb,0x14,0x21,0x06,0x55,0x9b,
0xe3,0xef,0x5e,0x31,0x4f,0x7f,0x5a,0xa4,0x0d,0x82,0x51,0x49,0x5f,0xba,0x58,0x1c,
0x4a,0x16,0xd5,0x17,0xa8,0x92,0x24,0x1f,0x8c,0xff,0xd8,0xae,0x2e,0x01,0xd3,0xad,
0x3b,0x4b,0xda,0x46,0xeb,0xc9,0xde,0x9a,0x8f,0x87,0xd7,0x3a,0x80,0x6f,0x2f,0xc8,
0xb1,0xb4,0x37,0xf7,0x0a,0x22,0x13,0x28,0x7c,0xcc,0x3c,0x89,0xc7,0xc3,0x96,0x56,
0x07,0xbf,0x7e,0xf0,0x0b,0x2b,0x97,0x52,0x35,0x41,0x79,0x61,0xa6,0x4c,0x10,0xfe,
0xbc,0x26,0x95,0x88,0x8a,0xb0,0xa3,0xfb,0xc0,0x18,0x94,0xf2,0xe1,0xe5,0xe9,0x5d,
0xd0,0xdc,0x11,0x66,0x64,0x5c,0xec,0x59,0x42,0x75,0x12,0xf5,0x74,0x9c,0xaa,0x23,
0x0e,0x86,0xab,0xbe,0x2a,0x02,0xe7,0x67,0xe6,0x44,0xa2,0x6c,0xc2,0x93,0x9f,0xf1,
0xf6,0xfa,0x36,0xd2,0x50,0x68,0x9e,0x62,0x71,0x15,0x3d,0xd6,0x40,0xc4,0xe2,0x0f,
0x8e,0x83,0x77,0x6b,0x25,0x05,0x3f,0x0c,0x30,0xea,0x70,0xb7,0xa1,0xe8,0xa9,0x65,
0x8d,0x27,0x1a,0xdb,0x81,0xb3,0xa0,0xf4,0x45,0x7a,0x19,0xdf,0xee,0x78,0x34,0x60,
};
static const uint8_t S1[256] = {
0x55,0xc2,0x63,0x71,0x3b,0xc8,0x47,0x86,0x9f,0x3c,0xda,0x5b,0x29,0xaa,0xfd,0x77,
0x8c,0xc5,0x94,0x0c,0xa6,0x1a,0x13,0x00,0xe3,0xa8,0x16,0x72,0x40,0xf9,0xf8,0x42,
0x44,0x26,0x68,0x96,0x81,0xd9,0x45,0x3e,0x10,0x76,0xc6,0xa7,0x8b,0x39,0x43,0xe1,
0x3a,0xb5,0x56,0x2a,0xc0,0x6d,0xb3,0x05,0x22,0x66,0xbf,0xdc,0x0b,0xfa,0x62,0x48,
0xdd,0x20,0x11,0x06,0x36,0xc9,0xc1,0xcf,0xf6,0x27,0x52,0xbb,0x69,0xf5,0xd4,0x87,
0x7f,0x84,0x4c,0xd2,0x9c,0x57,0xa4,0xbc,0x4f,0x9a,0xdf,0xfe,0xd6,0x8d,0x7a,0xeb,
0x2b,0x53,0xd8,0x5c,0xa1,0x14,0x17,0xfb,0x23,0xd5,0x7d,0x30,0x67,0x73,0x08,0x09,
0xee,0xb7,0x70,0x3f,0x61,0xb2,0x19,0x8e,0x4e,0xe5,0x4b,0x93,0x8f,0x5d,0xdb,0xa9,
0xad,0xf1,0xae,0x2e,0xcb,0x0d,0xfc,0xf4,0x2d,0x46,0x6e,0x1d,0x97,0xe8,0xd1,0xe9,
0x4d,0x37,0xa5,0x75,0x5e,0x83,0x9e,0xab,0x82,0x9d,0xb9,0x1c,0xe0,0xcd,0x49,0x89,
0x01,0xb6,0xbd,0x58,0x24,0xa2,0x5f,0x38,0x78,0x99,0x15,0x90,0x50,0xb8,0x95,0xe4,
0xd0,0x91,0xc7,0xce,0xed,0x0f,0xb4,0x6f,0xa0,0xcc,0xf0,0x02,0x4a,0x79,0xc3,0xde,
0xa3,0xef,0xea,0x51,0xe6,0x6b,0x18,0xec,0x1b,0x2c,0x80,0xf7,0x74,0xe7,0xff,0x21,
0x5a,0x6a,0x54,0x1e,0x41,0x31,0x92,0x35,0xc4,0x33,0x07,0x0a,0xba,0x7e,0x0e,0x34,
0x88,0xb1,0x98,0x7c,0xf3,0x3d,0x60,0x6c,0x7b,0xca,0xd3,0x1f,0x32,0x65,0x04,0x28,
0x64,0xbe,0x85,0x9b,0x2f,0x59,0x8a,0xd7,0xb0,0x25,0xac,0xaf,0x12,0x03,0xe2,0xf2,
};
// 常量数组D
#define F_(X1,X2) \
W1 = R1 + X1; \
W2 = R2 ^ X2; \
U = L1((W1 << 16) | (W2 >> 16)); \
V = L2((W2 << 16) | (W1 >> 16)); \
R1 = MAKEU32( S0[U >> 24], \
S1[(U >> 16) & 0xFF], \
S0[(U >> 8) & 0xFF], \
S1[U & 0xFF]); \
R2 = MAKEU32( S0[V >> 24], \
S1[(V >> 16) & 0xFF], \
S0[(V >> 8) & 0xFF], \
S1[V & 0xFF])
#define F(X0,X1,X2) \
((X0 ^ R1) + R2); \
F_(X1, X2)
#define ADD31(a,b) a += (b); a = (a & 0x7fffffff) + (a >> 31)
#define ROT31(a,k) ((((a) << (k)) | ((a) >> (31 - (k)))) & 0x7FFFFFFF)
#define ROT32(a,k) (((a) << (k)) | ((a) >> (32 - (k))))
#define L1(X) \
((X) ^ \
ROT32((X), 2) ^ \
ROT32((X), 10) ^ \
ROT32((X), 18) ^ \
ROT32((X), 24))
#define L2(X) \
((X) ^ \
ROT32((X), 8) ^ \
ROT32((X), 14) ^ \
ROT32((X), 22) ^ \
ROT32((X), 30))
#define LFSRWithInitialisationMode(u) \
V = LFSR[0]; \
ADD31(V, ROT31(LFSR[ 0], 8)); \
ADD31(V, ROT31(LFSR[ 4], 20)); \
ADD31(V, ROT31(LFSR[10], 21)); \
ADD31(V, ROT31(LFSR[13], 17)); \
ADD31(V, ROT31(LFSR[15], 15)); \
ADD31(V, (u)); \
{int j; for (j=0; j<15;j++) LFSR[j]=LFSR[j+1];} \
LFSR[15] = V
#define LFSRWithWorkMode() \
{ \
int j; \
uint64_t a = LFSR[0]; \
a += ((uint64_t)LFSR[ 0]) << 8; \
a += ((uint64_t)LFSR[ 4]) << 20; \
a += ((uint64_t)LFSR[10]) << 21; \
a += ((uint64_t)LFSR[13]) << 17; \
a += ((uint64_t)LFSR[15]) << 15; \
a = (a & 0x7fffffff) + (a >> 31); \
V = (uint32_t)((a & 0x7fffffff) + (a >> 31)); \
for (j = 0; j < 15; j++) \
LFSR[j] = LFSR[j+1]; \
LFSR[15] = V; \
}
#define BitReconstruction2(X1,X2) \
X1 = ((LFSR[11] & 0xFFFF) << 16) | (LFSR[9] >> 15); \
X2 = ((LFSR[7] & 0xFFFF) << 16) | (LFSR[5] >> 15)
#define BitReconstruction3(X0,X1,X2) \
X0 = ((LFSR[15] & 0x7FFF8000) << 1) | (LFSR[14] & 0xFFFF); \
BitReconstruction2(X1,X2)
#define BitReconstruction4(X0,X1,X2,X3) \
BitReconstruction3(X0,X1,X2); \
X3 = ((LFSR[2] & 0xFFFF) << 16) | (LFSR[0] >> 15)
#define MAKEU32(a, b, c, d) \
(((uint32_t)(a) << 24) | \
((uint32_t)(b) << 16) | \
((uint32_t)(c) << 8) | \
((uint32_t)(d)))
#define ZUC256_MAKEU31(a,b,c,d) \
(((uint32_t)(a) << 23) | \
((uint32_t)(b) << 16) | \
((uint32_t)(c) << 8) | \
(uint32_t)(d)) & 0x7FFFFFFF /* 确保31位 */
// 辅助函数:字节序转换
static inline uint32_t GETU32(const uint8_t *p) {
return ((uint32_t)p[0] << 24) | ((uint32_t)p[1] << 16) |
((uint32_t)p[2] << 8) | (uint32_t)p[3];
}
static inline void PUTU32(uint8_t *p, uint32_t v) {
p[0] = (uint8_t)(v >> 24);
p[1] = (uint8_t)(v >> 16);
p[2] = (uint8_t)(v >> 8);
p[3] = (uint8_t)v;
}
static const ZUC_UINT7 ZUC256_D[][16] = {
{0x22,0x2F,0x24,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
{0x22,0x2F,0x25,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
{0x23,0x2F,0x24,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
{0x23,0x2F,0x25,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
};
static void zuc256_set_mac_key(ZUC_STATE *key, const uint8_t K[32],
const uint8_t IV[23], int macbits)
{
ZUC_UINT31 *LFSR = key->LFSR;
uint32_t R1, R2;
uint32_t X0, X1, X2;
uint32_t W, W1, W2, U, V;
const ZUC_UINT7 *D;
int i;
ZUC_UINT6 IV17 = IV[17] >> 2;
ZUC_UINT6 IV18 = ((IV[17] & 0x3) << 4) | (IV[18] >> 4);
ZUC_UINT6 IV19 = ((IV[18] & 0xf) << 2) | (IV[19] >> 6);
ZUC_UINT6 IV20 = IV[19] & 0x3f;
ZUC_UINT6 IV21 = IV[20] >> 2;
ZUC_UINT6 IV22 = ((IV[20] & 0x3) << 4) | (IV[21] >> 4);
ZUC_UINT6 IV23 = ((IV[21] & 0xf) << 2) | (IV[22] >> 6);
ZUC_UINT6 IV24 = IV[22] & 0x3f;
D = macbits/32 < 3 ? ZUC256_D[macbits/32] : ZUC256_D[3];
LFSR[0] = ZUC256_MAKEU31(K[0], D[0], K[21], K[16]);
LFSR[1] = ZUC256_MAKEU31(K[1], D[1], K[22], K[17]);
LFSR[2] = ZUC256_MAKEU31(K[2], D[2], K[23], K[18]);
LFSR[3] = ZUC256_MAKEU31(K[3], D[3], K[24], K[19]);
LFSR[4] = ZUC256_MAKEU31(K[4], D[4], K[25], K[20]);
LFSR[5] = ZUC256_MAKEU31(IV[0], (D[5] | IV17), K[5], K[26]);
LFSR[6] = ZUC256_MAKEU31(IV[1], (D[6] | IV18), K[6], K[27]);
LFSR[7] = ZUC256_MAKEU31(IV[10], (D[7] | IV19), K[7], IV[2]);
LFSR[8] = ZUC256_MAKEU31(K[8], (D[8] | IV20), IV[3], IV[11]);
LFSR[9] = ZUC256_MAKEU31(K[9], (D[9] | IV21), IV[12], IV[4]);
LFSR[10] = ZUC256_MAKEU31(IV[5], (D[10] | IV22), K[10], K[28]);
LFSR[11] = ZUC256_MAKEU31(K[11], (D[11] | IV23), IV[6], IV[13]);
LFSR[12] = ZUC256_MAKEU31(K[12], (D[12] | IV24), IV[7], IV[14]);
LFSR[13] = ZUC256_MAKEU31(K[13], D[13], IV[15], IV[8]);
LFSR[14] = ZUC256_MAKEU31(K[14], (D[14] | (K[31] >> 4)), IV[16], IV[9]);
LFSR[15] = ZUC256_MAKEU31(K[15], (D[15] | (K[31] & 0x0F)), K[30], K[29]);
R1 = 0;
R2 = 0;
for (i = 0; i < 32; i++) {
BitReconstruction3(X0, X1, X2);
W = F(X0, X1, X2);
LFSRWithInitialisationMode(W >> 1);
}
BitReconstruction2(X1, X2);
F_(X1, X2);
LFSRWithWorkMode();
key->R1 = R1;
key->R2 = R2;
}
// 初始化ZUC256状态
void zuc256_init(ZUC_STATE *key, const uint8_t K[32],
const uint8_t IV[23])
{
if (!key || !K || !IV) return;
zuc256_set_mac_key(key, K, IV, 0);
}
// 生成单个密钥字
uint32_t zuc256_generate_keyword(ZUC_STATE *state) {
ZUC_UINT31 *LFSR = state->LFSR;
uint32_t R1 = state->R1;
uint32_t R2 = state->R2;
uint32_t X0, X1, X2, X3;
uint32_t W1, W2, U, V;
uint32_t Z;
BitReconstruction4(X0, X1, X2, X3);
Z = X3 ^ F(X0, X1, X2);
LFSRWithWorkMode();
state->R1 = R1;
state->R2 = R2;
return Z;
}
void zuc256_generate_keystream(ZUC_STATE *state, size_t nwords, uint32_t *keystream) {
ZUC_UINT31 *LFSR = state->LFSR;
uint32_t R1 = state->R1;
uint32_t R2 = state->R2;
uint32_t X0, X1, X2, X3;
uint32_t W1, W2, U, V;
size_t i;
for (i = 0; i < nwords; i ++) {
/*
BitReconstruction4(X0, X1, X2, X3);
keystream[i] = X3 ^ F(X0, X1, X2);
LFSRWithWorkMode();
*/
uint32_t T0, T1, T2, T3, T4, T5, T6, T7;
uint64_t a;
int j;
// expand BitReconstruction4(X0, X1, X2, X3)
X0 = ((LFSR[15] & 0x7FFF8000) << 1) | (LFSR[14] & 0xFFFF);
X1 = ((LFSR[11] & 0x0000FFFF) << 16) | (LFSR[ 9] >> 15);
X2 = ((LFSR[ 7] & 0x0000FFFF) << 16) | (LFSR[ 5] >> 15);
X3 = ((LFSR[ 2] & 0x0000FFFF) << 16) | (LFSR[ 0] >> 15);
//keystream[i] = X3 ^ F(X0, X1, X2);
keystream[i] = X3 ^ ((X0 ^ R1) + R2);
W1 = R1 + X1;
W2 = R2 ^ X2;
U = L1((W1 << 16) | (W2 >> 16));
V = L2((W2 << 16) | (W1 >> 16));
// table lookup together makes 10% faster
T0 = S0[(U >> 24) ];
T2 = S0[(U >> 8) & 0xFF];
T4 = S0[(V >> 24) ];
T6 = S0[(V >> 8) & 0xFF];
T1 = S1[(U >> 16) & 0xFF];
T3 = S1[(U ) & 0xFF];
T5 = S1[(V >> 16) & 0xFF];
T7 = S1[(V ) & 0xFF];
R1 = MAKEU32(T0, T1, T2, T3);
R2 = MAKEU32(T4, T5, T6, T7);
// expand LFSRWithWorkMode()
a = LFSR[0];
a += ((uint64_t)LFSR[ 0]) << 8;
a += ((uint64_t)LFSR[ 4]) << 20;
a += ((uint64_t)LFSR[10]) << 21;
a += ((uint64_t)LFSR[13]) << 17;
a += ((uint64_t)LFSR[15]) << 15;
a = (a & 0x7fffffff) + (a >> 31);
V = (uint32_t)((a & 0x7fffffff) + (a >> 31));
for (j = 0; j < 15; j++) {
LFSR[j] = LFSR[j+1];
}
LFSR[15] = V;
}
state->R1 = R1;
state->R2 = R2;
}
// 初始化加密上下文
void zuc256_encrypt_init(ZUC256_ENCRYPT_CTX *ctx, const uint8_t K[32], const uint8_t IV[23]) {
if (!ctx) return;
memset(ctx, 0, sizeof(*ctx));
zuc256_init(&ctx->state, K, IV);
}
// 分阶段处理加密数据(支持流式输入)
void zuc256_encrypt_update(ZUC256_ENCRYPT_CTX *ctx, const uint8_t *in, size_t inlen, uint8_t *out) {
if (!ctx || !in || !out || inlen == 0) return;
// 先处理缓冲区中剩余的非4字节数据
if (ctx->buflen > 0) {
size_t need = 4 - ctx->buflen;
size_t copy = (inlen < need) ? inlen : need;
memcpy(ctx->buf + ctx->buflen, in, copy);
ctx->buflen += copy;
in += copy;
inlen -= copy;
// 缓冲区已满，处理一个完整的4字节块
if (ctx->buflen == 4) {
uint32_t keystream = zuc256_generate_keyword(&ctx->state);
uint32_t plain = GETU32(ctx->buf);
PUTU32(out, plain ^ keystream);
ctx->buflen = 0;
memset(ctx->buf, 0, 4); // 清空缓冲区
out += 4;
}
}
// 处理完整的4字节块
size_t full_blocks = inlen / 4;
if (full_blocks > 0) {
size_t keystream_len = full_blocks;
uint32_t *keystream = (uint32_t*)malloc(keystream_len * sizeof(uint32_t));
if (keystream) {
zuc256_generate_keystream(&ctx->state, keystream_len, keystream);
// 逐块异或加密
for (size_t i = 0; i < full_blocks; i++) {
uint32_t plain = GETU32(in + i*4);
PUTU32(out + i*4, plain ^ keystream[i]);
}
free(keystream);
in += full_blocks * 4;
inlen -= full_blocks * 4;
out += full_blocks * 4;
}
}
// 缓存剩余不足4字节的数据
if (inlen > 0) {
memcpy(ctx->buf, in, inlen);
ctx->buflen = inlen;
}
}
// 完成加密处理(处理剩余数据并清理上下文)
void zuc256_encrypt_finish(ZUC256_ENCRYPT_CTX *ctx, uint8_t *out) {
if (!ctx || !out) return;
// 处理缓冲区中剩余的不足4字节数据
if (ctx->buflen > 0) {
uint32_t keystream = zuc256_generate_keyword(&ctx->state);
uint8_t keystream_bytes[4];
PUTU32(keystream_bytes, keystream);
// 逐字节异或
for (size_t i = 0; i < ctx->buflen; i++) {
out[i] = ctx->buf[i] ^ keystream_bytes[i];
}
}
// 清理上下文(安全考虑)
memset(ctx, 0, sizeof(*ctx));
}
// 一次性加密函数(ZUC加密和解密相同)
void zuc256_crypt(ZUC_STATE *state, const uint8_t *in, size_t inlen, uint8_t *out) {
if (!state || !in || !out) return;
ZUC256_ENCRYPT_CTX ctx;
// 修复1:初始化ctx内存(仅清空，不调用zuc256_encrypt_init)
memset(&ctx, 0, sizeof(ZUC256_ENCRYPT_CTX));
// 修复2:将传入的合法state复制到ctx->state，复用已有状态(含K/IV对应的初始化结果)
memcpy(&ctx.state, state, sizeof(ZUC_STATE));
// 正常执行加解密(使用复用的state)
zuc256_encrypt_update(&ctx, in, inlen, out);
// 计算剩余数据的偏移:(inlen / 4)*4 是完整4字节块的长度，剩余数据从这里开始
size_t remaining_offset = (inlen / 4) * 4;
zuc256_encrypt_finish(&ctx, out + remaining_offset);
// 修复3:将ctx->state的最新状态回写到传入的state(确保后续连续加解密的状态正确)
memcpy(state, &ctx.state, sizeof(ZUC_STATE));
}
void extract_iv(const uint8_t *input_25byte, uint8_t *output_23byte) {
if (!input_25byte || !output_23byte) return;
for (int i = 0; i < 17; i++) {
output_23byte[i] = input_25byte[i];
}
uint8_t src[8];
for (int i = 0; i < 8; i++) {
src[i] = input_25byte[17 + i] & 0x3F;
}
output_23byte[17] = (src[0] << 2) | (src[1] >> 4);
output_23byte[18] = ((src[1] & 0x0F) << 4) | (src[2] >> 2);
output_23byte[19] = ((src[2] & 0x03) << 6) | src[3];
output_23byte[20] = (src[4] << 2) | (src[5] >> 4);
output_23byte[21] = ((src[5] & 0x0F) << 4) | (src[6] >> 2);
output_23byte[22] = ((src[6] & 0x03) << 6) | src[7];
}
/**
* @brief 初始化ZUC256 MAC上下文
* @param ctx:MAC上下文指针(输出)
* @param key:256位密钥(32字节，输入)
* @param iv:23字节初始向量(输入)
* @param macbits:期望MAC输出位数(32/64/128，自动调整范围:<32→32，>128→128)
*/
void zuc256_mac_init(ZUC256_MAC_CTX *ctx, const uint8_t key[32],
const uint8_t iv[23], int macbits)
{
if (macbits < 32)
macbits = 32;
else if (macbits > 64)
macbits = 128;
memset(ctx, 0, sizeof(*ctx));
zuc256_set_mac_key((ZUC256_STATE *)ctx, key, iv, macbits);
zuc256_generate_keystream((ZUC256_STATE *)ctx, macbits/32, ctx->T);
zuc256_generate_keystream((ZUC256_STATE *)ctx, macbits/32, ctx->K0);
ctx->macbits = (macbits/32) * 32;
}
/**
* @brief 更新ZUC256 MAC待认证数据(支持分块输入)
* @param ctx:已初始化的MAC上下文(输入/输出)
* @param data:待认证数据块(输入，可NULL)
* @param len:待认证数据长度(字节，输入，0则无操作)
*/
void zuc256_mac_update(ZUC256_MAC_CTX *ctx, const uint8_t *data, size_t len)
{
ZUC_UINT32 K1, M;
size_t n = ctx->macbits / 32;
size_t i, j;
if (!data || !len) {
return;
}
if (ctx->buflen) {
size_t num = sizeof(ctx->buf) - ctx->buflen;
if (len < num) {
memcpy(ctx->buf + ctx->buflen, data, len);
ctx->buflen += len;
return;
}
memcpy(ctx->buf + ctx->buflen, data, num);
M = GETU32(ctx->buf);
ctx->buflen = 0;
K1 = zuc256_generate_keyword((ZUC_STATE *)ctx);
for (i = 0; i < 32; i++) {
if (M & 0x80000000) {
for (j = 0; j < n; j++) {
ctx->T[j] ^= ctx->K0[j];
}
}
M <<= 1;
for (j = 0; j < n - 1; j++) {
ctx->K0[j] = (ctx->K0[j] << 1) | (ctx->K0[j + 1] >> 31);
}
ctx->K0[j] = (ctx->K0[j] << 1) | (K1 >> 31);
K1 <<= 1;
}
data += num;
len -= num;
}
while (len >= 4) {
M = GETU32(data);
K1 = zuc256_generate_keyword((ZUC_STATE *)ctx);
for (i = 0; i < 32; i++) {
if (M & 0x80000000) {
for (j = 0; j < n; j++) {
ctx->T[j] ^= ctx->K0[j];
}
}
M <<= 1;
for (j = 0; j < n - 1; j++) {
ctx->K0[j] = (ctx->K0[j] << 1) | (ctx->K0[j + 1] >> 31);
}
ctx->K0[j] = (ctx->K0[j] << 1) | (K1 >> 31);
K1 <<= 1;
}
data += 4;
len -= 4;
}
if (len) {
memcpy(ctx->buf, data, len);
ctx->buflen = len;
}
}
/**
* @brief 完成ZUC256 MAC计算，输出最终认证码
* @param ctx:已更新数据的MAC上下文(输入/输出，调用后清空)
* @param data:最后一块待认证数据(可NULL，若需补充不足1字节的比特)
* @param nbits:最后一块数据的额外比特数(0~7，仅当data非NULL时有效)
* @param mac:MAC输出缓冲区(需提前分配至少 ctx->macbits/8 字节空间)
*/
void zuc256_mac_finish(ZUC256_MAC_CTX *ctx, const uint8_t *data, size_t nbits, uint8_t *mac)
{
ZUC_UINT32 K1, M;
size_t n = ctx->macbits/32;
size_t i, j;
if (!data)
nbits = 0;
if (nbits >= 8) {
zuc256_mac_update(ctx, data, nbits/8);
data += nbits/8;
nbits %= 8;
}
if (nbits)
ctx->buf[ctx->buflen] = *data;
if (ctx->buflen || nbits) {
M = GETU32(ctx->buf);
K1 = zuc256_generate_keyword((ZUC_STATE *)ctx);
for (i = 0; i < ctx->buflen * 8 + nbits; i++) {
if (M & 0x80000000) {
for (j = 0; j < n; j++) {
ctx->T[j] ^= ctx->K0[j];
}
}
M <<= 1;
for (j = 0; j < n - 1; j++) {
ctx->K0[j] = (ctx->K0[j] << 1) | (ctx->K0[j + 1] >> 31);
}
ctx->K0[j] = (ctx->K0[j] << 1) | (K1 >> 31);
K1 <<= 1;
}
}
for (j = 0; j < n; j++) {
ctx->T[j] ^= ctx->K0[j];
PUTU32(mac, ctx->T[j]);
mac += 4;
}
memset(ctx, 0, sizeof(*ctx));
}
/**
* @brief 一次性ZUC256 MAC计算(简化接口，适用于非流式数据
* @param K:256位密钥(32字节，输入)
* @param IV:23字节初始向量(输入)
* @param data:待认证数据(输入，可NULL)
* @param len:待认证数据长度(字节，输入)
* @param macbits:MAC输出位数(32/64/128，输入)
* @param mac:MAC输出缓冲区(输出，需提前分配空间)
*/
void zuc256_mac(const uint8_t K[32], const uint8_t IV[23], const uint8_t *data, size_t len, int macbits, uint8_t *mac) {
ZUC256_MAC_CTX ctx;
zuc256_mac_init(&ctx, K, IV, macbits);
if (data && len > 0) {
zuc256_mac_update(&ctx, data, len);
}
zuc256_mac_finish(&ctx, NULL, 0, mac);
}