注：
- 支持 cbc&ebc 模式;
- 支持任意待加密数据长度（PKCS7Padding）;
- 仅支持 ASCII;
- 开发环境：Qt 5.12.1.
源代码 & 可执行文件
文件：sm4.h
/** * \brief SM4 context structure */#ifndef SM4_H#define SM4_H#define SM4_ENCRYPT 0#define SM4_DECRYPT 1#define SM4_RESTART 1#define SM4_KEEP 0#ifdef __cplusplusextern "C" {#endif/** * \brief SM4-CBC buffer encryption/decryption * \param ctx SM4 context * \param dec_en SM4_ENCRYPT or SM4_DECRYPT * \param flag SM4_RESTART or SM4_KEEP * \param iv initialization vector (updated after use) * \param length length of the input data * \param input buffer holding the input data * \param output buffer holding the output data */unsigned int sm4_cbc(unsigned char key[16], int dec_en, int flag, unsigned char iv[16], unsigned int length, unsigned char *input, unsigned char *output );/** * \brief SM4-CBC buffer encryption/decryption * \param ctx SM4 context * \param dec_en SM4_ENCRYPT or SM4_DECRYPT * \param flag SM4_RESTART or SM4_KEEP * \param length length of the input data * \param input buffer holding the input data * \param output buffer holding the output data */unsigned int sm4_ecb(unsigned char key[16], int dec_en, int flag, unsigned int length, unsigned char *input, unsigned char *output);#ifdef __cplusplus}#endif#endif文件：sm4.c
#include <string.h>#include <stdio.h>/* * SM4 Encryption alogrithm (SMS4 algorithm) * GM/T 0002-2012 Chinese National Standard ref:http://www.oscca.gov.cn/ * thanks to Xyssl * thnaks and refers to http://hi.baidu.com/numax/blog/item/80addfefddfb93e4cf1b3e61.html * author:goldboar * email:goldboar@163.com * 2012-4-20 */// Test vector 1// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10// round key and temp computing result:// rk[ 0] = f12186f9 X[ 0] = 27fad345// rk[ 1] = 41662b61 X[ 1] = a18b4cb2// rk[ 2] = 5a6ab19a X[ 2] = 11c1e22a// rk[ 3] = 7ba92077 X[ 3] = cc13e2ee// rk[ 4] = 367360f4 X[ 4] = f87c5bd5// rk[ 5] = 776a0c61 X[ 5] = 33220757// rk[ 6] = b6bb89b3 X[ 6] = 77f4c297// rk[ 7] = 24763151 X[ 7] = 7a96f2eb// rk[ 8] = a520307c X[ 8] = 27dac07f// rk[ 9] = b7584dbd X[ 9] = 42dd0f19// rk[10] = c30753ed X[10] = b8a5da02// rk[11] = 7ee55b57 X[11] = 907127fa// rk[12] = 6988608c X[12] = 8b952b83// rk[13] = 30d895b7 X[13] = d42b7c59// rk[14] = 44ba14af X[14] = 2ffc5831// rk[15] = 104495a1 X[15] = f69e6888// rk[16] = d120b428 X[16] = af2432c4// rk[17] = 73b55fa3 X[17] = ed1ec85e// rk[18] = cc874966 X[18] = 55a3ba22// rk[19] = 92244439 X[19] = 124b18aa// rk[20] = e89e641f X[20] = 6ae7725f// rk[21] = 98ca015a X[21] = f4cba1f9// rk[22] = c7159060 X[22] = 1dcdfa10// rk[23] = 99e1fd2e X[23] = 2ff60603// rk[24] = b79bd80c X[24] = eff24fdc// rk[25] = 1d2115b0 X[25] = 6fe46b75// rk[26] = 0e228aeb X[26] = 893450ad// rk[27] = f1780c81 X[27] = 7b938f4c// rk[28] = 428d3654 X[28] = 536e4246// rk[29] = 62293496 X[29] = 86b3e94f// rk[30] = 01cf72e5 X[30] = d206965e// rk[31] = 9124a012 X[31] = 681edf34// cypher: 68 1e df 34 d2 06 96 5e 86 b3 e9 4f 53 6e 42 46//// test vector 2// the same key and plain 1000000 times coumpting// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10// cypher: 59 52 98 c7 c6 fd 27 1f 04 02 f8 04 c3 3d 3f 66#include <string.h>#include <stdio.h>//#include "svdpi.h"/* * 32-bit integer manipulation macros (big endian) */#ifndef GET_ULONG_BE#define GET_ULONG_BE(n,b,i) \{ \ (n) = ( (unsigned long) (b)[(i) ] << 24 ) \ | ( (unsigned long) (b)[(i) + 1] << 16 ) \ | ( (unsigned long) (b)[(i) + 2] << 8 ) \ | ( (unsigned long) (b)[(i) + 3] ); \}#endif#ifndef PUT_ULONG_BE#define PUT_ULONG_BE(n,b,i) \{ \ (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ (b)[(i) + 3] = (unsigned char) ( (n) ); \}#endif/* *rotate shift left marco definition/home/tim/work/sm4/rand_sim/sm4/testbench/dpi_c * */#define SHL(x,n) (((x) & 0xFFFFFFFF) << n)#define ROTL(x,n) (SHL((x),n) | ((x) >> (32 - n)))#define SWAP(a,b) { unsigned long t = a; a = b; b = t; t = 0; }/* * Expanded SM4 S-boxes * Sbox table: 8bits input convert to 8 bits output*/static const unsigned char SboxTable[16][16] ={{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}};/* System parameter */static const unsigned long FK[4] = {0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc};/* fixed parameter */static const unsigned long 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};/* * private function: * look up in SboxTable and get the related value. * args: [in] inch: 0x00~0xFF (8 bits unsigned value). */static unsigned char sm4Sbox(unsigned char inch){ unsigned char *pTable = (unsigned char *)SboxTable; unsigned char retVal = (unsigned char)(pTable[inch]); return retVal;}/* * private F(Lt) function: * "T algorithm" == "L algorithm" + "t algorithm". * args: [in] a: a is a 32 bits unsigned value; * return: c: c is calculated with line algorithm "L" and nonline algorithm "t" */static unsigned long sm4Lt(unsigned long ka){ unsigned long bb = 0; unsigned long c = 0; unsigned char a[4]; unsigned char b[4]; PUT_ULONG_BE(ka,a,0) b[0] = sm4Sbox(a[0]); b[1] = sm4Sbox(a[1]); b[2] = sm4Sbox(a[2]); b[3] = sm4Sbox(a[3]); GET_ULONG_BE(bb,b,0) c =bb^(ROTL(bb, 2))^(ROTL(bb, 10))^(ROTL(bb, 18))^(ROTL(bb, 24)); return c;}/* * private F function: * Calculating and getting encryption/decryption contents. * args: [in] x0: original contents; * args: [in] x1: original contents; * args: [in] x2: original contents; * args: [in] x3: original contents; * args: [in] rk: encryption/decryption key; * return the contents of encryption/decryption contents. */static unsigned long sm4F(unsigned long x0, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long rk){ return (x0^sm4Lt(x1^x2^x3^rk));}/* private function: * Calculating round encryption key. * args: [in] a: a is a 32 bits unsigned value; * return: sk[i]: i{0,1,2,3,...31}. */static unsigned long sm4CalciRK(unsigned long ka){ unsigned long bb = 0; unsigned long rk = 0; unsigned char a[4]; unsigned char b[4]; PUT_ULONG_BE(ka,a,0) b[0] = sm4Sbox(a[0]); b[1] = sm4Sbox(a[1]); b[2] = sm4Sbox(a[2]); b[3] = sm4Sbox(a[3]); GET_ULONG_BE(bb,b,0) rk = bb^(ROTL(bb, 13))^(ROTL(bb, 23)); return rk;}static void sm4_setkey( unsigned long SK[32], unsigned char key[16] ){ unsigned long MK[4]; unsigned long k[36]; unsigned long i = 0; GET_ULONG_BE( MK[0], key, 0 ); GET_ULONG_BE( MK[1], key, 4 ); GET_ULONG_BE( MK[2], key, 8 ); GET_ULONG_BE( MK[3], key, 12 ); k[0] = MK[0]^FK[0]; k[1] = MK[1]^FK[1]; k[2] = MK[2]^FK[2]; k[3] = MK[3]^FK[3]; for(; i<32; i++) { k[i+4] = k[i] ^ (sm4CalciRK(k[i+1]^k[i+2]^k[i+3]^CK[i])); SK[i] = k[i+4]; }}/* * SM4 standard one round processing */static void sm4_one_round( unsigned long sk[32], unsigned char input[16], unsigned char output[16] ){ unsigned long i = 0; unsigned long ulbuf[36]; memset(ulbuf, 0, sizeof(ulbuf)); GET_ULONG_BE( ulbuf[0], input, 0 ) GET_ULONG_BE( ulbuf[1], input, 4 ) GET_ULONG_BE( ulbuf[2], input, 8 ) GET_ULONG_BE( ulbuf[3], input, 12 ) while(i<32) { ulbuf[i+4] = sm4F(ulbuf[i], ulbuf[i+1], ulbuf[i+2], ulbuf[i+3], sk[i]); i++; } PUT_ULONG_BE(ulbuf[35],output,0); PUT_ULONG_BE(ulbuf[34],output,4); PUT_ULONG_BE(ulbuf[33],output,8); PUT_ULONG_BE(ulbuf[32],output,12);}static unsigned char pbIV[16];static unsigned long sk[32];void sm4_enc_128bit(unsigned long sk[32], unsigned char input[16], unsigned char output[16]){ sm4_one_round( sk, input, output);}void sm4_dec_128bit(unsigned long sk[32], unsigned char input[16], unsigned char output[16]){ int i; unsigned long sk_temp[32]; for( i = 0; i < 32; i ++ ) { sk_temp[i] = sk[31-i] ; } sm4_one_round( sk_temp, input, output);}/* * SM4 PKCS7Padding */unsigned int sm4_PKCS7Padding(unsigned char* buf, unsigned int length){ unsigned char padding_count = 0; unsigned int i = 0; padding_count = 16 - ((length % 16 == 0) ? 0 : (length % 16)); for(i=length; i<length+padding_count; i++) buf[i] = padding_count; return (length + padding_count);}/* * SM4 PKCS7Restore */unsigned int sm4_PKCS7Restore(unsigned char* buf, unsigned int length){ unsigned char padding_count = buf[length - 1]; unsigned char count = 0; unsigned int i = 0; for(i=length-padding_count; i<length; i++) { if(buf[i] != padding_count) { break; } else count ++; } if (count != padding_count) return -1; for(i=length - padding_count; i<length; i++) buf[i] = 0; return length - padding_count;}/* * SM4 cbc mode */unsigned int sm4_cbc( unsigned char key[16], int dec_en, int flag, unsigned char iv[16], unsigned int length, unsigned char *input, unsigned char *output ){ int i; unsigned char temp[16]; unsigned int len_t; if(flag) { memcpy(pbIV, iv, 16); sm4_setkey(sk, key); } if( dec_en == 0 ) // encryption { length = sm4_PKCS7Padding(input, length); len_t = length; while (length > 0) { for( i = 0; i < 16; i++ ) temp[i] = (unsigned char)( input[i] ^ pbIV[i] ); sm4_enc_128bit(sk, temp, output); memcpy( pbIV, output, 16 ); input += 16; output += 16; length -= 16; } } else // dencryption { len_t = length; while (length > 0) { memcpy( temp, input, 16 ); sm4_dec_128bit( sk, input, output ); for( i = 0; i < 16; i++ ) output[i] = (unsigned char)( output[i] ^ pbIV[i] ); memcpy( pbIV, temp, 16 ); input += 16; output += 16; length -= 16; } output -= len_t; len_t = sm4_PKCS7Restore(output, len_t); } return len_t;}/* * SM4 ecb mode */unsigned int sm4_ecb(unsigned char key[16], int dec_en, int flag, unsigned int length, unsigned char *input, unsigned char *output){ unsigned int len_t; if(flag) sm4_setkey(sk, key); if (dec_en==0) { length = sm4_PKCS7Padding(input, length); len_t = length; while (length > 0) { sm4_enc_128bit(sk,input,output); //encryption input += 16; output += 16; length -= 16; } } else { len_t = length; while (length > 0) { sm4_dec_128bit(sk,input,output); //decryption input += 16; output += 16; length -= 16; } output -= len_t; len_t = sm4_PKCS7Restore(output, len_t); } return len_t;}