无线局域网产品使用的SMS4密码算法简单实现

无线局域网产品使用的SMS4密码算法

 

中文文档下载地址

http://www.oscca.gov.cn/UpFile/200621016423197990.pdf

 

SMS4 Encryption Algorithm for Wireless Networks

 

英文文档下载地址

http://eprint.iacr.org/2008/329.pdf

 

对文档描述进行了简单的直译

有很多地方可以优化

仅实现了128-bit block的加解密

可根据具体应用结合CBC方式使用

 

 

/* * A simple implementation of SMS4 Encryption Algorithm for Wireless Networks. * * No Rights Reserved. */#include <stdio.h>#include <string.h>#define ROTATE(a,n)     (((a) << (n)) | (((a) & 0xffffffff) >> (32 - (n))))#define SWAP32(a)((((a) & 0xff000000) >> 24) | (((a) & 0x000000ff) << 24) \| (((a) & 0x0000ff00) << 8) | (((a) & 0x00ff0000) >> 8))static unsigned char Sbox[256] = {0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48};static unsigned int CK[32] = {0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279};static unsigned int FK[4] = {0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc};/*Non-linear substitution tau*/static inline unsigned intt(unsigned int A){unsigned int a0 = (A >> 24) & 0xff;unsigned int a1 = (A >> 16) & 0xff;unsigned int a2 = (A >> 8) & 0xff;unsigned int a3 = A & 0xff;unsigned int b0 = Sbox[a0];unsigned int b1 = Sbox[a1];unsigned int b2 = Sbox[a2];unsigned int b3 = Sbox[a3];unsigned int B = (((b0 << 24) & 0xff000000)| ((b1 << 16) & 0x00ff0000)| ((b2 << 8) & 0x0000ff00)| (b3 & 0xff));return B;}static inline unsigned intL_ap(unsigned int B){return (B ^ (ROTATE(B, 13)) ^ (ROTATE(B, 23)));}static inline unsigned intT_ap(unsigned int Z){return L_ap(t(Z));}/*Key expansion@MK: the 128bits encryption key@rk: the derived round key, return value*/static inline voidkey_exp(unsigned int MK[4], unsigned int rk[32]){int i;unsigned int K[4];K[0] = MK[0] ^ FK[0];K[1] = MK[1] ^ FK[1];K[2] = MK[2] ^ FK[2];K[3] = MK[3] ^ FK[3];rk[0] = K[0] ^ T_ap(K[1] ^ K[2] ^ K[3] ^ CK[0]);rk[1] = K[1] ^ T_ap(K[2] ^ K[3] ^ rk[0] ^ CK[1]);rk[2] = K[2] ^ T_ap(K[3] ^ rk[0] ^ rk[1] ^ CK[2]);rk[3] = K[3] ^ T_ap(rk[0] ^ rk[1] ^ rk[2] ^ CK[3]);for (i = 4; i < 32; i++) {rk[i] = rk[i - 4] ^ T_ap(rk[i - 3] ^ rk[i - 2] ^ rk[i - 1] ^ CK[i]);}}/*Linear substitution L*/static inline unsigned intL(unsigned int B){unsigned int C;C = (B ^ (ROTATE(B, 2)) ^ (ROTATE(B, 10)) ^ (ROTATE(B, 18)) ^ (ROTATE(B, 24)));return C;}/*Mixer-substitution T*/static inline unsigned intT(unsigned int Z){return L(t(Z));}/*reverse substitution*/static inline voidR(unsigned int A[4]){A[0] = A[0] ^ A[3];A[3] = A[0] ^ A[3];A[0] = A[0] ^ A[3];A[1] = A[1] ^ A[2];A[2] = A[1] ^ A[2];A[1] = A[1] ^ A[2];}/*The round function*/static inline unsigned intF(unsigned int X[4], unsigned int rk){return (X[0] ^ T(X[1] ^ X[2] ^ X[3] ^ rk));}/*Encryption and decryption*/static inline void__sms4(unsigned int X[4], unsigned int rk[32], unsigned int Y[4], int encrypt){int i;unsigned int tmp[36];tmp[0] = X[0];tmp[1] = X[1];tmp[2] = X[2];tmp[3] = X[3];for (i = 0; i < 32; i++) {if (encrypt) {tmp[i + 4] = F(tmp + i, rk[i]);} else {tmp[i + 4] = F(tmp + i, rk[31 - i]);}//printf("rk[%2d] = %08x\t", i, rk[i]);//printf("X[%2d] = %08x\n", i, tmp[i + 4]);}R(tmp + 32);Y[0] = tmp[32];Y[1] = tmp[33];Y[2] = tmp[34];Y[3] = tmp[35];}static inline void_sms4(unsigned int X[4], unsigned int MK[4], unsigned int Y[4], int encrypt){unsigned int rk[32];key_exp(MK, rk);__sms4(X, rk, Y, encrypt);}static inline voidsms4(unsigned char *plain, unsigned char *key, unsigned char *cipher, int encrypt){unsigned int *p = (unsigned int *)plain;unsigned int *k = (unsigned int *)key;unsigned int *c = (unsigned int *)cipher;unsigned int X[4];unsigned int MK[4];unsigned int Y[4];MK[0] = SWAP32(k[0]);MK[1] = SWAP32(k[1]);MK[2] = SWAP32(k[2]);MK[3] = SWAP32(k[3]);X[0] = SWAP32(p[0]);X[1] = SWAP32(p[1]);X[2] = SWAP32(p[2]);X[3] = SWAP32(p[3]);_sms4(X, MK, Y, encrypt);c[0] = SWAP32(Y[0]);c[1] = SWAP32(Y[1]);c[2] = SWAP32(Y[2]);c[3] = SWAP32(Y[3]);}/*@plain: 128-bit block@key: 128-bit block@cipher: 128-bit block*/voidsms4_encrypt(unsigned char *plain, unsigned char *key, unsigned char *cipher){sms4(plain, key, cipher, 1);}/*@plain: 128-bit block@key: 128-bit block@cipher: 128-bit block*/voidsms4_decrypt(unsigned char *cipher, unsigned char *key, unsigned char *plain){sms4(cipher, key, plain, 0);}voidtest1(void){unsigned char plain[16] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};unsigned char key[16] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};unsigned char cipher[16] = {0x68, 0x1e, 0xdf, 0x34, 0xd2, 0x06, 0x96, 0x5e,0x86, 0xb3, 0xe9, 0x4f, 0x53, 0x6e, 0x42, 0x46};unsigned char buf[16];int i;sms4_encrypt(plain, key, buf);for (i = 0; i < 16; i++) {printf("0x%02x ", buf[i]);}printf("\n");if (memcmp(cipher, buf, 16)) {printf("1 error\n");}sms4_decrypt(cipher, key, buf);for (i = 0; i < 16; i++) {printf("0x%02x ", buf[i]);}printf("\n");}voidtest1000000(void){unsigned char plain[16] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};unsigned char key[16] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};unsigned char cipher[16] = {0x59, 0x52, 0x98, 0xc7, 0xc6, 0xfd, 0x27, 0x1f,0x04, 0x02, 0xf8, 0x04, 0xc3, 0x3d, 0x3f, 0x66};unsigned char buf[16];int i;memcpy(buf, plain, 16);for (i = 0; i < 1000000; i++) {sms4_encrypt(buf, key, buf);}for (i = 0; i < 16; i++) {printf("0x%02x ", buf[i]);}printf("\n");if (memcmp(cipher, buf, 16)) {printf("1000000 error\n");}memcpy(buf, cipher, 16);for (i = 0; i < 1000000; i++) {sms4_decrypt(buf, key, buf);}for (i = 0; i < 16; i++) {printf("0x%02x ", buf[i]);}printf("\n");}intmain(void){test1();test1000000();return 0;}