[英]c MD5 from openssl lib does not match php md5 how come?
I am trying to create a md5 hash that I am comparing against a php md5 hash. 我正在尝试创建要与md5哈希进行比较的md5哈希。
The two don't seam to be the same 两者不相同
below is my c code along with the php compairison 以下是我的C代码以及php compairison
Why are the two md5 not the same? 为什么两个md5不同?
Make command 发出命令
gcc -Wall -lssl -o test test.c
Code test.c 代码测试
#include <stdio.h>
#include <openssl/md5.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
#include <time.h>
unsigned char result[MD5_DIGEST_LENGTH];
// Print the MD5 sum as hex-digits.
void print_md5_sum(unsigned char* md, char* md5) {
int i;
for(i=0; i < MD5_DIGEST_LENGTH; i++) {
char temp[3];
snprintf(temp,sizeof(temp),"%02x",md[i]);
if(i == 0){
strncpy(md5,temp,3);
}else{
strncat(md5,temp,MD5_DIGEST_LENGTH);
}
}
printf("md5 is %s \n", md5);
}
int main(int argc, char** argv ){
char* file_buffer = "testtest";
char buffer[MD5_DIGEST_LENGTH +1];
MD5((unsigned char*) file_buffer, sizeof(file_buffer), result);
printf("length %i\n", MD5_DIGEST_LENGTH);
print_md5_sum(result,buffer);
printf("%s \n" ,buffer);
return 0;
}
php code PHP代码
<?php
echo md5("testtest");
?>
results 结果
php md5 PHP的MD5
05a671c66aefea124cc08b76ea6d30bb
c code md5 C代码md5
098f6bcd4621d373cade4e832627b4f6
sizeof(file_buffer)
does not give you the correct length to calculate the MD5 sum over. sizeof(file_buffer)
没有给您正确的长度来计算MD5总和。 It only gives you the size of the pointer file_buffer, which will be likely either 4 or 8 depending on your platform. 它只会为您提供指针file_buffer的大小,根据您的平台,大小可能为4或8。
In this case you are probably better calling the MD5() function like this: 在这种情况下,您最好像这样调用MD5()函数:
MD5((unsigned char*) file_buffer, strlen(file_buffer), result);
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