Linux c based on OpenSSL generates MD5 functions

The Linux OpenSSL provides a series of hash and cryptographic functions, if calling the MD5 function provided by OpenSSL to generate an arbitrary string of MD5? The following provides a section of code to implement the Linux C string generation MD5 function.

Specific code:

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#include "stdio.h"#include <string.h>#include <stdlib.h>#include <openssl/md5.h>intget_md5(char*input,char*output){    charpassword[1024*1024*5]={0};    MD5_CTX x;    inti = 0, len;    char*out = NULL;    unsigned chard[16];    unsigned chartmp[128] = { 0 };     strcpy (password,input);    MD5_Init(&x);    MD5_Update(&x, (char*)password, strlen(password));    MD5_Final(d, &x);    out = (char*)malloc(35);    memset(out, 0x00, 35);    strcpy(out, "$1$");   // printf("MD5(\"%s\") = ", password);    for(i = 0; i < 16; i++)    {        sprintf (out + (i*2), "%02X", d[i]); // 转换为32位    }    out[32] = 0;   // printf("%s\n", out);    strcpy(output,out);    free(out);    return 0;}

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Two code is also provided for reference:

Method One:

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#include<stdio.h>#include<openssl/md5.h>#include<string.h>intmain( intargc, char**argv ){MD5_CTX ctx;unsigned char*data= "123";unsigned charmd[16];charbuf[33]={‘\0‘};chartmp[3]={‘\0‘};inti;MD5_Init(&ctx);MD5_Update(&ctx,data,strlen(data));MD5_Final(md,&ctx);for ( i=0; i<16; i++ ){sprintf(tmp,"%02X",md[i]);strcat(buf,tmp);}printf("%s\n",buf);return0;}

Output:

202cb962ac59075b964b07152d234b70

Method Two:

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#include<stdio.h>#include<openssl/md5.h>#include<string.h>intmain( intargc, char**argv ){unsigned char*data = "123";unsigned charmd[16];inti;chartmp[3]={ ‘\0‘},buf[33]={‘\0‘};MD5(data,strlen(data),md);for(i = 0; i < 16; i++){sprintf(tmp,"%2.2x",md[i]);strcat(buf,tmp);}printf("%s\n",buf);return 0;}

Output:

202cb962ac59075b964b07152d234b70

Article Source:Linux C based on OpenSSL generation MD5 function

Linux c based on OpenSSL generates MD5 functions