这段代码演示了如何在C语言中使用OpenSSL库执行HMAC-SM3散列函数，对给定的消息进行签名和验证。它初始化HMAC上下文，设置密钥，更新消息并比较两个生成的摘要以检查一致性。
2.8 MAC示例代码
#include "openssl/hmac.h"
int test_evp_hmac_sm3()
{
const EVP_MD *md = NULL;
int flag, dlen1, dlen2;
unsigned char key[16]={0x66,0xc7,0xf0,0xf4, 0x62,0xee,0xed,0xd9, 0xd1,0xf2,0xd4,0x6b, 0xdc,0x10,0xe4,0xe2};
unsigned char msg[64]={
0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64,
0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64,
0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64,
0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64, 0x61,0x62,0x63,0x64
};
unsigned char digest1[64],digest2[64], *pdata = NULL;
HMAC_CTX ctx, ctx2;
printf("\n************************************************************\n");
printf("测试OpenSSL HMAC SM3\n\n");
md = EVP_sm3();
HMAC_CTX_init(&ctx);
flag = HMAC_Init(&ctx, key, sizeof(key), md);
flag = HMAC_Update(&ctx, msg, sizeof(msg));
flag = HMAC_Final(&ctx, digest1, &dlen1);
HMAC_CTX_cleanup(&ctx);
pdata = HMAC( md, key, sizeof(key), msg, sizeof(msg), digest2, &dlen2);
flag = ( memcmp(digest1, digest2, dlen1) == 0 );
printf("flag = %d\n\n", flag);
return 1;
}
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