使用openssl和C ++生成sha256 [英] generate sha256 with openssl and C++

问题描述

我想用sha256使用openssl和C ++创建一个散列。我知道这里有一个类似的帖子：

生成sha哈希在openssl ，但我正在寻找专门创建sha256。

更新：

似乎是包含路径的问题。它不能找到任何openssl函数，即使我包括

  #includeopenssl / sha.h
  
 
 
 
我在我的生成中包含了路径
  -I / opt / ssl / include / -L / opt / ssl / lib / -lcrypto 
  
 
 
解决方案
这是我做的：
  void sha256 string，char outputBuffer [65]）
 {
 unsigned char hash [SHA256_DIGEST_LENGTH]; 
 SHA256_CTX sha256; 
 SHA256_Init（& sha256）; 
 SHA256_Update（& sha256，string，strlen（string））; 
 SHA256_Final（hash，& sha256）; 
 int i = 0; 
 for（i = 0; i  {
 sprintf（outputBuffer +（i * 2），％02x，hash [i] 
} 
 outputBuffer [64] = 0; 
} 
 
 int sha256_file（char * path，char outputBuffer [65]）
 {
 FILE * file = fopen（path，rb）; 
 if（！file）return -534; 
 
字节散列[SHA256_DIGEST_LENGTH]; 
 SHA256_CTX sha256; 
 SHA256_Init（& sha256）; 
 const int bufSize = 32768; 
 byte * buffer = malloc（bufSize）; 
 int bytesRead = 0; 
 if（！buffer）return ENOMEM; 
 while（（bytesRead = fread（buffer，1，bufSize，file）））
 {
 SHA256_Update（& sha256，buffer，bytesRead）; 
} 
 SHA256_Final（hash，& sha256）; 
 
 sha256_hash_string（hash，outputBuffer）; 
 fclose（file）; 
 free（buffer）; 
 return 0; 
} 
  
这样调用：
 
 $ b b 
  static unsigned char buffer [65]; 
 sha256（string，buffer）; 
 printf（％s\\\
，buffer）; 
  
 
I'm looking to create a hash with sha256 using openssl and C++. I know there's a similar post about this here: 

generate sha hash in openssl, but I'm looking to specifically create sha256.  

UPDATE: 

Seems to be a problem witht he include paths. It can't find any openssl functions even though I included 
#include "openssl/sha.h"
and I included the paths in my build
-I/opt/ssl/include/ -L/opt/ssl/lib/ -lcrypto 

解决方案
Here's how I did it:
void sha256(char *string, char outputBuffer[65])
{
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, string, strlen(string));
    SHA256_Final(hash, &sha256);
    int i = 0;
    for(i = 0; i < SHA256_DIGEST_LENGTH; i++)
    {
        sprintf(outputBuffer + (i * 2), "%02x", hash[i]);
    }
    outputBuffer[64] = 0;
}

int sha256_file(char *path, char outputBuffer[65])
{
    FILE *file = fopen(path, "rb");
    if(!file) return -534;

    byte hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    const int bufSize = 32768;
    byte *buffer = malloc(bufSize);
    int bytesRead = 0;
    if(!buffer) return ENOMEM;
    while((bytesRead = fread(buffer, 1, bufSize, file)))
    {
        SHA256_Update(&sha256, buffer, bytesRead);
    }
    SHA256_Final(hash, &sha256);

    sha256_hash_string(hash, outputBuffer);
    fclose(file);
    free(buffer);
    return 0;
}
It's called like this:
static unsigned char buffer[65];
sha256("string", buffer);
printf("%s\n", buffer);


                        
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