/* * 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 * @version: 1.0.0 * @date: 2025-09-01 * * @note: 无 * * Change Logs: * Date Author Notes * 2025-08-04 QZH 创建文件 */ #include #include #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); }