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SNOW-V算法C语言实现

news 2026/5/2 20:38:56

新手第一次写算法，有冗余部分多多包涵。

SNOW_V.c部分

#include <stdio.h> #include "SNOW_V.h" #include <string.h> #include <stdint.h> struct Infor { uint16_t Key[16]; //算法运算的密钥 uint16_t IV[8]; //算法运算的初始化向量 uint16_t lfsr_A[16]; //线性移位寄存器A，每个小寄存器16位 uint16_t lfsr_B[16]; //线性移位寄存器B，每个小寄存器16位 uint32_t R1[4], R2[4], R3[4]; //三个记忆单元，每个单元128位，采用小端存储 uint32_t T1[4], T2[4]; //进入FSM部分的变量 uint32_t Z[4]; //输出密钥字 uint8_t trigger_signal; }; //实例化唯一 static struct Infor g_info; //全局声明函数区 static inline uint16_t mul_alpha_a(uint16_t x); // 在 F_{2^16}^A 域上，乘以本原元 α（来自文件的快速实现） static inline uint16_t mul_alpha_b(uint16_t x); // 在 F_{2^16}^B 域上，乘以本原元 β（来自文件的快速实现） static inline uint16_t mul_alpha_inv_a(uint16_t x); // 在 F_{2^16}^A 域上，乘以 α 的逆元 α^{-1} static inline uint16_t mul_alpha_inv_b(uint16_t x); // 在 F_{2^16}^B 域上，乘以 β 的逆元 β^{-1} void Infor_Output(); //计算输出函数 void AESR(uint32_t* Result, const uint32_t* Source); //AES轮函数实现 void Sigema(uint32_t* Result, const uint32_t* Source); //σ变换 //初始化寄存器（全部置0） void Infor_Init(void) { for (int i = 0; i < 16; i++) { g_info.lfsr_A[i] = 0; g_info.lfsr_B[i] = 0; } for (int i = 0; i < 4; i++) { g_info.R1[i] = 0; g_info.R2[i] = 0; g_info.R3[i] = 0; g_info.T1[i] = 0; g_info.T2[i] = 0; g_info.Z[i] = 0; } g_info.trigger_signal = 0; } //装填密钥和向量(密钥256比特，16×16；向量128比特，8×16) void Infor_Input(uint16_t* Key, uint16_t* IV) { for (int i = 0; i < 8; i++) { g_info.lfsr_A[i] = IV[i]; g_info.lfsr_A[i + 8] = Key[i]; g_info.lfsr_B[i + 8] = Key[i + 8]; g_info.Key[i] = Key[i]; g_info.Key[i + 8] = Key[i + 8]; g_info.IV[i] = IV[i]; } } //LFSR更新函数(更新一次) void Infor_LFSRupdate(void) { uint16_t temp_a = 0, temp_b = 0; temp_a = g_info.lfsr_B[0] ^ (mul_alpha_a(g_info.lfsr_A[0]))^g_info.lfsr_A[1] ^ mul_alpha_inv_a(g_info.lfsr_A[8]); temp_b = g_info.lfsr_A[0] ^ (mul_alpha_b(g_info.lfsr_B[0]))^g_info.lfsr_B[3] ^ mul_alpha_inv_b(g_info.lfsr_B[8]); for (int i = 0; i < 15; i++) { g_info.lfsr_A[i] = g_info.lfsr_A[i + 1]; g_info.lfsr_B[i] = g_info.lfsr_B[i + 1]; } g_info.lfsr_A[15] = temp_a; g_info.lfsr_B[15] = temp_b; } //比特抽取 void Infor_BitExtraction(void) { //LFSR_B高位是KEY高位 g_info.T1[0] = (g_info.lfsr_B[9] << 16) | g_info.lfsr_B[8]; g_info.T1[1] = (g_info.lfsr_B[11] << 16) | g_info.lfsr_B[10]; g_info.T1[2] = (g_info.lfsr_B[13] << 16) | g_info.lfsr_B[12]; g_info.T1[3] = (g_info.lfsr_B[15] << 16) | g_info.lfsr_B[14]; //LFSR_A低位是IV的值 g_info.T2[0] = (g_info.lfsr_A[1] << 16) | g_info.lfsr_A[0]; g_info.T2[1] = (g_info.lfsr_A[3] << 16) | g_info.lfsr_A[2]; g_info.T2[2] = (g_info.lfsr_A[5] << 16) | g_info.lfsr_A[4]; g_info.T2[3] = (g_info.lfsr_A[7] << 16) | g_info.lfsr_A[6]; } //FSM更新函数 void Infor_FSMupdate() { uint32_t R1_new[4], R2_new[4], R3_new[4]; uint32_t temp[4] = {0}; //更新R1 for (int i = 0; i < 4; i++) { temp[i] = g_info.R2[i] + (g_info.R3[i] ^ g_info.T2[i]); } //σ变换（更新R1） Sigema(R1_new, temp); //更新R2、R3 AESR(R2_new, g_info.R1); AESR(R3_new, g_info.R2); //全部写回 for (int i = 0; i < 4; i++) { g_info.R1[i] = R1_new[i]; g_info.R2[i] = R2_new[i]; g_info.R3[i] = R3_new[i]; } } //初始化模式 void Infor_InitMod() { for (int i = 0; i < 16; i++) { Infor_BitExtraction(); Infor_Output(); Infor_FSMupdate(); for (int j = 0; j < 8; j++) { Infor_LFSRupdate(); } g_info.lfsr_A[8] ^= (g_info.Z[0] & 0xffff); g_info.lfsr_A[9] ^= ((g_info.Z[0] >> 16) & 0xffff); g_info.lfsr_A[10] ^= (g_info.Z[1] & 0xffff); g_info.lfsr_A[11] ^= ((g_info.Z[1] >> 16) & 0xffff); g_info.lfsr_A[12] ^= (g_info.Z[2] & 0xffff); g_info.lfsr_A[13] ^= ((g_info.Z[2] >> 16) & 0xffff); g_info.lfsr_A[14] ^= (g_info.Z[3] & 0xffff); g_info.lfsr_A[15] ^= ((g_info.Z[3] >> 16) & 0xffff); if (i == 14) { //将密钥的低128位（k₇, …, k₀）异或到 R1 寄存器 // key[0]~key[7] 对应 k₀~k₇（低128位） uint32_t key_word = 0; for (int j = 0; j < 4; j++) { // 将两个连续的16位密钥字组合成一个32位字，按小端序：低位密钥在低16位 key_word = ((uint32_t)g_info.Key[2 * j + 1] << 16) | g_info.Key[2 * j]; g_info.R1[j] ^= key_word; } } if (i == 15) { //将密钥的高128位（k₁₅, …, k₈）异或到 R1 寄存器 // key[8]~key[15] 对应 k₈~k₁₅（高128位） uint32_t key_word = 0; for (int j = 0; j < 4; j++) { key_word = ((uint32_t)g_info.Key[2 * j + 9] << 16) | g_info.Key[2 * j + 8]; g_info.R1[j] ^= key_word; } } } } //工作模式 uint32_t* Infor_WorkMod() { Infor_BitExtraction(); Infor_Output(); Infor_FSMupdate(); for (int i = 0; i < 8; i++) { Infor_LFSRupdate(); } return g_info.Z; } //打印Infor信息 void Infor_Print(void) { uint32_t result = 0; uint16_t middle = 0; printf("LFSR_A的值为："); for (int i = 0; i < 16; i++) { middle = __builtin_bswap16(g_info.lfsr_A[i]); printf("%x ", middle); } printf("\n"); printf("LFSR_B的值为："); for (int i = 0; i < 16; i++) { middle = __builtin_bswap16(g_info.lfsr_B[i]); printf("%x ", middle); } printf("\n"); printf("R1的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32(g_info.R1[i]); printf("%x ", result); } printf("\n"); printf("R2的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32( g_info.R2[i]); printf("%x ", result); } printf("\n"); printf("R3的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32(g_info.R3[i]); printf("%x ", result); } printf("\n"); printf("T1的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32(g_info.T1[i]); printf("%x ", result); } printf("\n"); printf("T2的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32(g_info.T2[i]); printf("%x ", result); } printf("\n"); printf("Z的值为："); for (int i = 0; i < 4; i++) { result = __builtin_bswap32(g_info.Z[i]); printf("%x ", result); } printf("\n"); printf("trigger的值为："); printf("%d ", g_info.trigger_signal); printf("\n"); } // 在 F_{2^16}^A 域上，乘以本原元 α（来自文件的快速实现） static inline uint16_t mul_alpha_a(uint16_t x) { uint16_t GA = 0x990f; if (x & 0x8000) return (x << 1)^GA; else return (x << 1); } // 在 F_{2^16}^B 域上，乘以本原元 β（来自文件的快速实现） static inline uint16_t mul_alpha_b(uint16_t x) { uint16_t GB = 0xc963; if (x & 0x8000) return (x << 1)^GB; else return (x << 1); } // 在 F_{2^16}^A 域上，乘以 α 的逆元 α^{-1} static inline uint16_t mul_alpha_inv_a(uint16_t x) { uint16_t GA_inv = 0xcc87; if (x & 0x0001) return (x >> 1)^GA_inv; else return (x >> 1); } // 在 F_{2^16}^B 域上，乘以 β 的逆元 β^{-1} static inline uint16_t mul_alpha_inv_b(uint16_t x) { uint16_t GB_inv = 0xe4b1; if (x & 0x0001) return (x >> 1)^GB_inv; else return (x >> 1); } //计算输出函数 void Infor_Output() { for (int i = 0; i < 4; i++) { g_info.Z[i] = (g_info.R1[i] + g_info.T1[i])^g_info.R2[i]; } } //多项式乘2 static inline uint8_t gm2(uint8_t a) { uint8_t t0 = a << 1; if (a >> 7 == 1) return t0 ^ 0x1b; return t0; } //多项式乘3 static inline uint8_t gm3(uint8_t a) { return gm2(a) ^ a; } //AES算法S盒 static const uint8_t AES_SBOX[256] = { 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }; //AES轮函数字节变换 void sub_bytes(uint8_t state[16]) { for (uint8_t i = 0; i < 16; i++) { state[i] = AES_SBOX[state[i]]; } } //AES轮函数行移位变换 void shift_rows(uint8_t state[16]) { uint8_t temp0, temp1; temp0 = state[1]; state[1] = state[5]; state[5] = state[9]; state[9] = state[13]; state[13] = temp0; temp0 = state[2]; temp1 = state[6]; state[2] = state[10]; state[6] = state[14]; state[10] = temp0; state[14] = temp1; temp0 = state[15]; state[15] = state[11]; state[11] = state[7]; state[7] = state[3]; state[3] = temp0; } //AES轮函数列混合变换 void mix_columns(uint8_t state[16]) { uint8_t i, j, col[4], res[4]; for (j = 0; j < 4; j++) { for (i = 0; i < 4; i++) col[i] = state[i + 4 * j]; res[0] = gm2(col[0]) ^ gm3(col[1]) ^ col[2] ^ col[3]; res[1] = col[0] ^ gm2(col[1]) ^ gm3(col[2]) ^ col[3]; res[2] = col[0] ^ col[1] ^ gm2(col[2]) ^ gm3(col[3]); res[3] = gm3(col[0]) ^ col[1] ^ col[2] ^ gm2(col[3]); for (i = 0; i < 4; i++) state[i + 4 * j] = res[i]; } } //AES轮函数实现 void AESR(uint32_t* Result, const uint32_t* Source) { // 小端序：Source[0]是最低有效字 uint8_t bytes[16]; for (int i = 0; i < 4; i++) { uint32_t word = Source[i]; bytes[4 * i] = word & 0xFF; // 最低字节 bytes[4 * i + 1] = (word >> 8) & 0xFF; bytes[4 * i + 2] = (word >> 16) & 0xFF; bytes[4 * i + 3] = (word >> 24) & 0xFF; // 最高字节 } //字节替换 sub_bytes(bytes); //行移位 shift_rows(bytes); //列混合 mix_columns(bytes); // 转换回32位字（小端序） for (int i = 0; i < 4; i++) { Result[i] = ((uint32_t)bytes[4 * i + 3] << 24) | // 最高字节 ((uint32_t)bytes[4 * i + 2] << 16) | ((uint32_t)bytes[4 * i + 1] << 8) | bytes[4 * i]; // 最低字节 } } //σ变换 void Sigema(uint32_t* Result, const uint32_t* Source) { // σ置换表 const uint8_t sigma_map[16] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 }; // 小端序：Source[0]是最低有效字 uint8_t in_bytes[16], out_bytes[16]; for (int i = 0; i < 4; i++) { uint32_t word = Source[i]; in_bytes[4 * i] = word & 0xFF; // 最低字节 in_bytes[4 * i + 1] = (word >> 8) & 0xFF; in_bytes[4 * i + 2] = (word >> 16) & 0xFF; in_bytes[4 * i + 3] = (word >> 24) & 0xFF; // 最高字节 } // 应用σ置换 for (int i = 0; i < 16; i++) { out_bytes[i] = in_bytes[sigma_map[i]]; } // 转换回32位字（小端序） for (int i = 0; i < 4; i++) { Result[i] = ((uint32_t)out_bytes[4 * i + 3] << 24) | // 最高字节 ((uint32_t)out_bytes[4 * i + 2] << 16) | ((uint32_t)out_bytes[4 * i + 1] << 8) | out_bytes[4 * i]; // 最低字节 } }

SNOW_V.h部分

#ifndef SNOW_V_H #define SNOW_V_H #include <string.h> #include <stdint.h> struct Infor; void Infor_Init(void); //初始化寄存器（全部置0） void Infor_Input(uint16_t* Key, uint16_t* IV); //装填密钥和向量(密钥256比特，16×16；向量128比特，8×16) void Infor_LFSRupdate(void); //LFSR更新函数 void Infor_BitExtraction(void); //比特抽取 void Infor_FSMupdate(); //FSM更新函数 void Infor_InitMod(); //初始化模式 uint32_t* Infor_WorkMod(); //工作模式 void Infor_Print(void); //打印Infor信息 #endif

main.c部分

#include <stdio.h> #include "SNOW_V.h" #include <string.h> #include <stdint.h> void test_SNOW_V() { uint16_t key[16] = {0}; uint16_t IV[8]={0}; Infor_Init(); Infor_Input(key, IV); Infor_InitMod(); //用来转换输出格式，不影响算法实现 uint32_t* middle=NULL; uint32_t result=0; for(int i=0;i<1;i++) { middle=Infor_WorkMod(); for(int j=0;j<4;j++) { result = __builtin_bswap32(middle[j]); printf("%08x",result); } printf("\n"); } } int main() { test_SNOW_V(); return 0; }

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