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#include "hash.h"
#include <blake2.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int pow_check_blake2b_hash(char *path, char *target_hash) {
FILE *fp = fopen(path, "rb");
if (!fp) {
printf("failed to open file to check hash\n");
return 1;
}
fseek(fp, 0, SEEK_END);
long fsize = ftell(fp);
fseek(fp, 0, SEEK_SET);
if (fsize < 0) {
printf("error: ftell\n");
fclose(fp);
return 1;
}
char *buf = NULL;
if (fsize > 0) {
buf = malloc((size_t)fsize);
if (!buf) {
fprintf(stderr, "out of memory\n");
fclose(fp);
return 1;
}
if (fread(buf, 1, (size_t)fsize, fp) != (size_t)fsize) {
fprintf(stderr, "read error\n");
free(buf);
fclose(fp);
return 1;
}
}
fclose(fp);
uint8_t digest[BLAKE2B_OUTBYTES];
if (blake2b(digest, buf, NULL, BLAKE2B_OUTBYTES, (size_t)fsize, 0) != 0) {
fprintf(stderr, "blake2b failed\n");
free(buf);
return 1;
}
free(buf);
char hex[BLAKE2B_OUTBYTES * 2 + 1];
for (size_t i = 0; i < BLAKE2B_OUTBYTES; i++) {
snprintf(&hex[i * 2], 3, "%02x", digest[i]);
}
hex[BLAKE2B_OUTBYTES * 2] = '\0';
if (!target_hash || strcmp(hex, target_hash) != 0) {
return 1;
}
return 0;
}
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