使用 OpenSSL 和 C++ 生成 sha256 [英] Generate sha256 with OpenSSL and C++
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问题描述
我希望使用 openssl 和 C++ 创建一个带有 sha256 的哈希.我知道在 使用 OpenSSL 库在 C++ 中生成 SHA 哈希 上有一个类似的帖子,但我正在寻找专门创建 sha256.
I'm looking to create a hash with sha256 using openssl and C++. I know there's a similar post at Generate SHA hash in C++ using OpenSSL library, but I'm looking to specifically create sha256.
更新:
似乎是包含路径的问题.即使我包含了
Seems to be a problem with the include paths. It can't find any OpenSSL functions even though I included
#include "openssl/sha.h"
并且我在构建中包含了路径
and I included the paths in my build
-I/opt/ssl/include/ -L/opt/ssl/lib/ -lcrypto
推荐答案
我是这样做的:
void sha256_hash_string (unsigned char hash[SHA256_DIGEST_LENGTH], char outputBuffer[65])
{
int i = 0;
for(i = 0; i < SHA256_DIGEST_LENGTH; i++)
{
sprintf(outputBuffer + (i * 2), "%02x", hash[i]);
}
outputBuffer[64] = 0;
}
void sha256_string(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;
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init(&sha256);
const int bufSize = 32768;
unsigned char *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;
}
它是这样叫的:
static unsigned char buffer[65];
sha256("string", buffer);
printf("%s
", buffer);
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