【stun系列04】hmac_sha1加密算法的C/C++代码

HMAC运算利用哈希算法，以一个密钥和一个消息为输入，生成一个消息摘要作为输出。HMACSHA1 接受任何大小的密钥，并产生长度为 160 位（20字节）的哈希序列。

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linux平台代码：

依赖openssl库，先安装openssl依赖库：

yum install openssl openssl-devel -y

检查/usr/local/下是否有openssl文件夹

加密C代码:

test.c

#include <stdio.h>
#include <string.h>
#include <openssl/hmac.h>

int main(int argc,void **argv) {
    //key value
    const char key[] = "745s295z8lv458ll46w2467ta460562n";
    //data in hex, /or you can init with text
    unsigned char data[] = {
         0x00,0x01,0x00,0x48,0x21,0x12,0xa4,0x42,0x78,0x2b,0x66,0x6b,0x32,0x34,0x30,0x6b
        ,0x4e,0x51,0x6a,0x56,0x00,0x06,0x00,0x0d,0x36,0x37,0x76,0x32,0x37,0x30,0x37,0x35
        ,0x3a,0x31,0x33,0x42,0x5a,0x00,0x00,0x00,0xc0,0x57,0x00,0x04,0x00,0x02,0x00,0x00
        ,0x80,0x2a,0x00,0x08,0x70,0xfb,0xe5,0x05,0x91,0xbf,0x83,0x3c,0x00,0x24,0x00,0x04
        ,0x6e,0x7e,0x1e,0xff
    };
    
    unsigned char result[20] = {0};
    int resultlen = 20;


    HMAC_CTX ctx;
    HMAC_CTX_init(&ctx);
    // Using sha1 hash engine here.
    // You may use other hash engines. e.g EVP_md5(), EVP_sha224, EVP_sha512, etc
    HMAC_Init_ex(&ctx, key, strlen(key), EVP_sha1(), NULL);
    HMAC_Update(&ctx, (unsigned char*)&data, sizeof(data));
    HMAC_Final(&ctx, result, &resultlen);
    HMAC_CTX_cleanup(&ctx);

    //print the result in hex format
    for (int i = 0; i < resultlen; i++)
        printf("%02x", result[i]);

    printf("\n");
    return 0;
}

/*  1.1.1m版本
　　 HMAC_CTX *ctx = HMAC_CTX_new();
　　 HMAC_Init_ex(ctx, passwd, passwdlen, EVP_sha1(), NULL);
　　 HMAC_Update(ctx, data, datalen);
 　　HMAC_Final(ctx, dest, destlen);
　　 HMAC_CTX_free(ctx);
*/

　　　linux使用命令gcc编译，需要依赖libcrypto，编译命令如下：

gcc -o test test.c -lssl -lcrypto

　　编译后执行./test即可看到结果：

c7c49a60946fa024e5f6212ec63814fe2e76b26d

结果是否正确可以根据系列03或者其中的网址进行二次校验

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windows平台代码：

#include <stdio.h>
#include <openssl/ossl_typ.h>
#include <openssl/hmac.h>
#include <string.h>

void hmac_sha1(char* passwd, int passwdlen, unsigned char* data, short datalen, unsigned char* dest, unsigned int *destlen) {
	//use hmac sha1 to encode data with remote passwd.
	HMAC_CTX *ctx = HMAC_CTX_new();
	HMAC_Init_ex(ctx, passwd, passwdlen, EVP_sha1(), NULL);
	HMAC_Update(ctx, data, datalen);
	HMAC_Final(ctx, dest, destlen);
	HMAC_CTX_free(ctx);
}


int main(int argc, char **argv) {
	unsigned char data[] = {
		 0x00,0x01,0x00,0x48,0x21,0x12,0xa4,0x42,0x78,0x2b,0x66,0x6b,0x32,0x34,0x30,0x6b
		,0x4e,0x51,0x6a,0x56,0x00,0x06,0x00,0x0d,0x36,0x37,0x76,0x32,0x37,0x30,0x37,0x35
		,0x3a,0x31,0x33,0x42,0x5a,0x00,0x00,0x00,0xc0,0x57,0x00,0x04,0x00,0x02,0x00,0x00
		,0x80,0x2a,0x00,0x08,0x70,0xfb,0xe5,0x05,0x91,0xbf,0x83,0x3c,0x00,0x24,0x00,0x04
		,0x6e,0x7e,0x1e,0xff };
	int datalen = sizeof(data);

	char passwd[] = "745s295z8lv458ll46w2467ta460562n";
	int passwdlen = strlen(passwd);

	unsigned char result[20] = { 0 };
	unsigned int resultlen = 0;

	hmac_sha1(passwd, passwdlen, data, datalen, result, &resultlen);
	for (int i = 0; i < resultlen; i++)
		printf("%02x", result[i]);
	printf("\n");
	return 0;
}

　　windows需要安装openssl，需要编译x86时选择对应32位版本的openssl安装，否则会出错

将openssl的include和lib库路径填入工程，并添加libcrypto.lib库，编译即可。运行结果如下：