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比如：6F4D8407A0000003330101A542500B50424F43204372656469748701019F38069F33039F4E145F2D087A68656E667264659F1101019F120F4341524420494D4147452030303031BF0C059F4D020B0A, 可以如下分析：6F 4D … 试用一下便知，很好用的。

int main() { unsigned char key[16] = {0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10}; unsigned char input[16] = {0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10}; unsigned char output[16]; sm4_context ctx; unsigned long i; //encrypt standard testing vector sm4_setkey_enc(&ctx,key); sm4_crypt_ecb(&ctx,1,16,input,output); for(i=0;i<16;i++) printf("x ", output[i]); printf("\n"); //decrypt testing sm4_setkey_dec(&ctx,key); sm4_crypt_ecb(&ctx,0,16,output,output); for(i=0;i<16;i++) printf("x ", output[i]); printf("\n"); //decrypt 1M times testing vector based on standards. i = 0; sm4_setkey_enc(&ctx,key); while (i<1000000) { sm4_crypt_ecb(&ctx,1,16,input,input); i++; } for(i=0;i<16;i++) printf("x ", input[i]); printf("\n"); return 0; }

int main( int argc, char *argv[] ) { unsigned char *input = "abc"; int ilen = 3; unsigned char output[32]; int i; sm3_context ctx; printf("Message:\n"); printf("%s\n",input); sm3(input, ilen, output); printf("Hash:\n "); for(i=0; i<32; i++) { printf("x",output[i]); if (((i+1) % 4 ) == 0) printf(" "); } printf("\n"); printf("Message:\n"); for(i=0; i < 16; i++) printf("abcd"); printf("\n"); sm3_starts( &ctx ); for(i=0; i < 16; i++) sm3_update( &ctx, "abcd", 4 ); sm3_finish( &ctx, output ); memset( &ctx, 0, sizeof( sm3_context ) ); printf("Hash:\n "); for(i=0; i<32; i++) { printf("x",output[i]); if (((i+1) % 4 ) == 0) printf(" "); } printf("\n"); //getch(); //VS2008

国标算法2、3、4早已公开，现在把公开的SM2.3.4三个算法文本规范与大家分享一下

国密算法SM2、3、4早已公开，即国标算法SM2/3/4 的 C语言实现，欢迎大家下载使用

3路密码算法的C语言源码实现，方便移植，易在嵌入式中应用。