Add sha256sum program.

This commit is contained in:
Stephen Heumann 2017-07-03 23:56:36 -05:00
parent e7aa261e19
commit 1f3d51a5c9

55
sha256sum.c Normal file
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/*
* Copyright (c) 2017 Stephen Heumann
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "sha256.h"
unsigned char buf[0x8000];
int main(int argc, char **argv) {
struct sha256_context ctx;
FILE *file;
size_t count;
int i;
srand(time(NULL));
if (argc != 2)
return EXIT_FAILURE;
file = fopen(argv[1], "rb");
if (file == NULL)
return EXIT_FAILURE;
sha256_init(&ctx);
do {
count = (rand() & 0x7FFF) + 1;
count = fread(buf, 1, count, file);
sha256_update(&ctx, buf, count);
} while (count != 0);
fclose(file);
sha256_finalize(&ctx);
for (i = 0; i < 32; i++) {
printf("%02x", ctx.hash[i]);
}
printf("\n");
return 0;
}