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fix bug

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qzh
2025-09-01 14:35:38 +08:00
parent ec0fc7b2c4
commit 4873142634
3 changed files with 408 additions and 195 deletions
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28
inc/zuc256.h
View File

@@ -9,29 +9,40 @@
typedef uint32_t ZUC_UINT31; // 31位无符号整数
typedef uint8_t ZUC_UINT7; // 7位无符号整数
typedef uint8_t ZUC_UINT6; // 6位无符号整数
typedef uint32_t ZUC_UINT32; // 32位无符号整数
// ZUC状态结构体
typedef struct {
ZUC_UINT31 LFSR[16]; // 线性反馈移位寄存器
uint32_t R1; // 寄存器1
uint32_t R2; // 寄存器2
} ZUC256_STATE;
} ZUC_STATE;
typedef ZUC_STATE ZUC256_STATE;
// 加密上下文结构体(用于分阶段处理)
typedef struct {
ZUC256_STATE state; // 基础ZUC状态
ZUC_STATE state; // 基础ZUC状态
uint8_t buf[4]; // 输入缓冲区(处理非4字节对齐数据)
size_t buflen; // 缓冲区中有效字节数
} ZUC256_ENCRYPT_CTX;
// ZUC256 MAC 上下文结构体
typedef struct {
ZUC_UINT31 LFSR[16]; // ZUC256 线性反馈移位寄存器
uint32_t R1; // 非线性函数寄存器R1
uint32_t R2; // 非线性函数寄存器R2
uint8_t buf[4]; // 数据缓存（处理不足4字节的待认证数据）
size_t buflen; // 缓存中有效数据长度（0~3）
uint32_t T[4]; // MAC 累加器（支持最大128位MAC，4个32位字）
uint32_t K0[4]; // MAC 初始密钥字（与T长度匹配）
int macbits; // MAC 输出位数（32/64/128，按32位对齐）
} ZUC256_MAC_CTX;
// 初始化ZUC256状态
void zuc256_init(ZUC256_STATE *state, const uint8_t K[32], const uint8_t IV[23]);
void zuc256_init(ZUC_STATE *state, const uint8_t K[32], const uint8_t IV[23]);
// 生成单个密钥字
uint32_t zuc256_generate_keyword(ZUC256_STATE *state);
uint32_t zuc256_generate_keyword(ZUC_STATE *state);
// 生成指定长度的密钥流
void zuc256_generate_keystream(ZUC256_STATE *state, size_t nwords, uint32_t *keystream);
void zuc256_generate_keystream(ZUC_STATE *state, size_t nwords, uint32_t *keystream);
// 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]);
@@ -43,8 +54,7 @@ void zuc256_encrypt_update(ZUC256_ENCRYPT_CTX *ctx, const uint8_t *in, size_t in
void zuc256_encrypt_finish(ZUC256_ENCRYPT_CTX *ctx, uint8_t *out);
// 一次性加密函数
void zuc256_crypt(ZUC256_STATE *state, const uint8_t *in, size_t inlen, uint8_t *out);
void zuc256_crypt(ZUC_STATE *state, const uint8_t *in, size_t inlen, uint8_t *out);
void extract_iv(const uint8_t *input_25byte, uint8_t *output_23byte);
#endif /*__ZUC256_H */

4
src/main.c
View File

@@ -12,7 +12,7 @@ void print_hex(const char *label, const uint8_t *data, size_t len) {
}
int main() {
// 1. 明文
// 1. 明文
uint8_t plaintext[] = "ZUC256对称加解密测试:1234567890";
size_t plaintext_len = strlen((char*)plaintext);
printf("明文: %s\n", plaintext);
@@ -38,7 +38,7 @@ int main() {
}
// 5. 加密
ZUC256_STATE state;
ZUC_STATE state;
zuc256_init(&state, key, iv);
zuc256_crypt(&state, plaintext, plaintext_len, ciphertext);
print_hex("密文", ciphertext, plaintext_len);

393
src/zuc256.c
View File

@@ -42,18 +42,24 @@ static const uint8_t S1[256] = {
};
// 常量数组D
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},
};
// 核心宏定义
#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))))
@@ -72,7 +78,8 @@ static const ZUC_UINT7 ZUC256_D[][16] = {
ROT32((X), 22) ^ \
ROT32((X), 30))
#define LFSRWithInitialisationMode(u, LFSR, V) \
#define LFSRWithInitialisationMode(u) \
V = LFSR[0]; \
ADD31(V, ROT31(LFSR[ 0], 8)); \
ADD31(V, ROT31(LFSR[ 4], 20)); \
@@ -83,7 +90,7 @@ static const ZUC_UINT7 ZUC256_D[][16] = {
{int j; for (j=0; j<15;j++) LFSR[j]=LFSR[j+1];} \
LFSR[15] = V
#define LFSRWithWorkMode(LFSR, V) \
#define LFSRWithWorkMode() \
{ \
int j; \
uint64_t a = LFSR[0]; \
@@ -99,16 +106,16 @@ static const ZUC_UINT7 ZUC256_D[][16] = {
LFSR[15] = V; \
}
#define BitReconstruction2(X1,X2, LFSR) \
#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, LFSR) \
#define BitReconstruction3(X0,X1,X2) \
X0 = ((LFSR[15] & 0x7FFF8000) << 1) | (LFSR[14] & 0xFFFF); \
BitReconstruction2(X1,X2, LFSR)
BitReconstruction2(X1,X2)
#define BitReconstruction4(X0,X1,X2,X3, LFSR) \
BitReconstruction3(X0,X1,X2, LFSR); \
#define BitReconstruction4(X0,X1,X2,X3) \
BitReconstruction3(X0,X1,X2); \
X3 = ((LFSR[2] & 0xFFFF) << 16) | (LFSR[0] >> 15)
#define MAKEU32(a, b, c, d) \
@@ -123,30 +130,7 @@ static const ZUC_UINT7 ZUC256_D[][16] = {
((uint32_t)(c) << 8) | \
(uint32_t)(d)) & 0x7FFFFFFF /* 确保31位 */
//F_函数宏
#define F_(X1,X2) do { \
uint32_t W1, W2, U, V; \
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]); \
} while(0)
//F函数宏
#define F(X0,X1,X2) ({ \
uint32_t result; \
result = ((X0 ^ R1) + R2) & 0xFFFFFFFF; \
F_(X1, X2); \
result; \
})
// 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) |
@@ -158,31 +142,35 @@ static inline void PUTU32(uint8_t *p, uint32_t v) {
p[2] = (uint8_t)(v >> 8);
p[3] = (uint8_t)v;
}
// 设置MAC密钥(内部使用)
static void zuc256_set_mac_key(ZUC256_STATE *key, const uint8_t K[32],
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 = 0, R2 = 0;
uint32_t X0, X1, X2, W;
uint32_t R1, R2;
uint32_t X0, X1, X2;
uint32_t W, W1, W2, U, V;
const ZUC_UINT7 *D;
int i;
uint32_t V;
// 从IV中提取扩展位
ZUC_UINT6 IV17 = (IV[17] >> 2) & 0x3F;
ZUC_UINT6 IV18 = (((IV[17] & 0x3) << 4) | (IV[18] >> 4)) & 0x3F;
ZUC_UINT6 IV19 = (((IV[18] & 0xF) << 2) | (IV[19] >> 6)) & 0x3F;
ZUC_UINT6 IV20 = (IV[19] & 0x3F) & 0x3F;
ZUC_UINT6 IV21 = (IV[20] >> 2) & 0x3F;
ZUC_UINT6 IV22 = (((IV[20] & 0x3) << 4) | (IV[21] >> 4)) & 0x3F;
ZUC_UINT6 IV23 = (((IV[21] & 0xF) << 2) | (IV[22] >> 6)) & 0x3F;
ZUC_UINT6 IV24 = (IV[22] & 0x3F) & 0x3F;
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;
// 选择合适的D数组
D = (macbits/32 < 3) ? ZUC256_D[macbits/32] : ZUC256_D[3];
// 初始化LFSR状态
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]);
@@ -197,79 +185,121 @@ static void zuc256_set_mac_key(ZUC256_STATE *key, const uint8_t K[32],
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) & 0x0F)), IV[16], IV[9]);
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;
// 32轮初始迭代
for (i = 0; i < 32; i++) {
BitReconstruction3(X0, X1, X2, LFSR);
BitReconstruction3(X0, X1, X2);
W = F(X0, X1, X2);
LFSRWithInitialisationMode(W >> 1, LFSR, V);
LFSRWithInitialisationMode(W >> 1);
}
// 切换到工作模式
BitReconstruction2(X1, X2, LFSR);
BitReconstruction2(X1, X2);
F_(X1, X2);
LFSRWithWorkMode(LFSR, V);
LFSRWithWorkMode();
// 保存寄存器状态
key->R1 = R1;
key->R2 = R2;
}
// 初始化ZUC256状态
void zuc256_init(ZUC256_STATE *state, const uint8_t K[32], const uint8_t IV[23]) {
if (!state || !K || !IV) return;
zuc256_set_mac_key(state, K, IV, 0);
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(ZUC256_STATE *state) {
if (!state) return 0;
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 Z, V;
uint32_t W1, W2, U, V;
uint32_t Z;
BitReconstruction4(X0, X1, X2, X3, LFSR);
BitReconstruction4(X0, X1, X2, X3);
Z = X3 ^ F(X0, X1, X2);
LFSRWithWorkMode(LFSR, V);
LFSRWithWorkMode();
// 更新状态
state->R1 = R1;
state->R2 = R2;
return Z;
}
// 生成指定长度的密钥流
void zuc256_generate_keystream(ZUC256_STATE *state, size_t nwords, uint32_t *keystream) {
if (!state || !keystream || nwords == 0) return;
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 V;
uint32_t W1, W2, U, V;
size_t i;
for (i = 0; i < nwords; i++) {
BitReconstruction4(X0, X1, X2, X3, LFSR);
for (i = 0; i < nwords; i ++) {
/*
BitReconstruction4(X0, X1, X2, X3);
keystream[i] = X3 ^ F(X0, X1, X2);
LFSRWithWorkMode(LFSR, V);
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;
}
// 更新状态
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;
@@ -352,17 +382,23 @@ void zuc256_encrypt_finish(ZUC256_ENCRYPT_CTX *ctx, uint8_t *out) {
}
// 一次性加密函数(ZUC加密和解密相同)
void zuc256_crypt(ZUC256_STATE *state, const uint8_t *in, size_t inlen, uint8_t *out) {
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;
zuc256_encrypt_init(&ctx, NULL, NULL);
memcpy(&ctx.state, state, sizeof(ZUC256_STATE)); // 复制当前状态
// 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);
zuc256_encrypt_finish(&ctx, out + (inlen / 4) * 4);
// 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);
memcpy(state, &ctx.state, sizeof(ZUC256_STATE)); // 回写状态
// 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;
@@ -381,3 +417,170 @@ void extract_iv(const uint8_t *input_25byte, uint8_t *output_23byte) {
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);
}