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/* this is a cleaned-up version of
* http://adamlamers.com/?p=5
*/
#include <stdio.h>
#include <malloc.h>
#include <errno.h>
#include "checksum.h"
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 (char *string, char outputBuffer[65])
{
int i;
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init (&sha256);
SHA256_Update (&sha256, string, strlen(string));
SHA256_Final (hash, &sha256);
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])
{
int bytesRead;
unsigned char *buffer;
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
FILE *file = fopen (path, "rb");
if (!file)
{
return -534;
}
SHA256_Init (&sha256);
buffer = malloc (BUFSIZE);
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;
}
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