[英]md5sum array of int in c
i want to get the same summation with a code C and the command md5sum file.data each time i get the the md5sum and the output of to_md5() different, how to get the same ? 我想每次使用md5sum和to_md5()的输出不同时,使用代码C和命令md5sum file.data获得相同的总和,如何获得相同的总和?
my code is like the next : 我的代码如下:
char* to_md5(int* buffer,int buffersize){
MD5_CTX ctx;
int fg,n,i;
char* out = (char*)malloc(33);
char digest[MD5_DIGEST_LENGTH];
for(i = 0 ; i <= buffersize ; i=i+10)
{
fg = MD5_Init(&ctx);
fg = MD5_Update(&ctx,buffer+i,i);
fg = MD5_Final(digest,&ctx);
if(fg != 1) {fprintf(stderr,"error in MD5_Update() ");exit(-1);}
printf("digest = %x\n",digest);
}
for (n = 0; n < 16; ++n)
{
snprintf(&(out[n*2]), 16*2, "%02x", (unsigned int)digest[n]);
}
printf(" char = %s\n",out);
return out ;
}
int main (){
int i,ierr,rc,iter;
char out[256];
int* buffer;
int buffersize;
int nb_iter;
FILE * file;
if(ierr != 0) exit(-1);
buffersize = 5;
nb_iter = 1;
buffersize *= 10;
printf("bufsize: %ld\n",buffersize);
buffer = (int*) calloc(buffersize,sizeof(int));
srand(time(NULL));
for(i = 0; i < buffersize; i ++){
buffer[i] = rand();
}
file = fopen("buffer.dat","w");
fwrite(buffer,sizeof(int),buffersize,file);
fclose(file);
printf(" :md5sum:%s]\n",to_md5(buffer,buffersize));
// the command to compare my checksum of my array
printf("md5sum = ");system("md5sum buffer.dat");
printf("\n");
free(buffer);
return 0 ;
}
each time i get the the md5sum and the output of to_md5() different, how to get the same ?
每次我得到md5sum和to_md5()的输出不同时,如何得到相同的?
i want a C program give the same thing as md5sum the input (buffer) : is a random array of integer; 我想让C程序给输入 (缓冲区)和md5sum一样的东西:是整数的随机数组; the output (out) : is a md5 checksum ;
输出 (输出):是md5校验和; this is my csample of a code is realy working:
这是我的代码示例确实可以正常工作:
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<stdint.h>
#include<string.h>
#include<unistd.h>
#include<openssl/md5.h>
int get_md5sum(void* buffer,
unsigned long buffersize,
char* checksum){
MD5_CTX ctx;
int rc,i;
unsigned char digest[MD5_DIGEST_LENGTH];
rc = MD5_Init(&ctx);
if(rc != 1) {
fprintf(stderr,"error in get_md5sum : MD5_Init\n");
return 1;
}
rc = MD5_Update(&ctx,buffer,sizeof(int)*buffersize);
if(rc != 1) {
fprintf(stderr,"error in get_md5sum : MD5_Update\n");
return 1;
}
rc = MD5_Final(digest,&ctx);
if(rc != 1) {
fprintf(stderr,"error in get_md5sum : MD5_Final\n");
return 1;
}
for (i = 0; i < MD5_DIGEST_LENGTH; i++) {
snprintf(&(checksum[i*2]), 16*2, "%02x", (unsigned int)digest[i]);
}
checksum[2*MD5_DIGEST_LENGTH+1] = '\0';
return 0;
}
int main (){
int i,ierr;
char out[33];
int* buffer;
int buffersize;
int iter,nb_iter;
FILE* file;
buffersize = 5;
nb_iter = 8;
buffersize *= 10;
printf("bufsize: %ld\n",buffersize);
buffer = (int*) calloc(buffersize,sizeof(int));
srand(time(NULL));
for(i = 0; i < buffersize; i++){
buffer[i] = rand();
}
ierr = get_md5sum(buffer,buffersize,out);
if(ierr!=0) exit(-1);
file= fopen("buffer.dat","w");
fwrite((int*)buffer,sizeof(int),buffersize,file);
fclose(file);
printf("\nwith function get_md5sum :\n%s\n",out);
printf("with command\t\t");
system(" md5sum buffer.dat");
free(buffer);
return 0 ;
}
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