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example.c
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example.c
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// SPDX-FileCopyrightText: Red Hat Inc
// SPDX-License-Identifier: LGPL-2.1-or-later
/* blkhash example program. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <blkhash.h>
#define BUF_SIZE (2 * 1024 * 1024)
int main()
{
struct blkhash *h = NULL;
unsigned char *buf = NULL;
unsigned char md[BLKHASH_MAX_MD_SIZE];
unsigned int md_len, i;
int err;
h = blkhash_new();
if (h == NULL) {
err = errno;
goto out;
}
buf = malloc(BUF_SIZE);
if (buf == NULL) {
err = errno;
goto out;
}
/* Hash some data. */
memset(buf, 'A', BUF_SIZE);
err = blkhash_update(h, buf, BUF_SIZE);
if (err)
goto out;
/* Hash more data, detecting zero blocks. */
memset(buf, '\0', BUF_SIZE);
err = blkhash_update(h, buf, BUF_SIZE);
if (err)
goto out;
/* Hash 1G of zeros. */
err = blkhash_zero(h, 1024 * 1024 * 1024);
if (err)
goto out;
/* Finalize the hash and print a message digest. */
err = blkhash_final(h, md, &md_len);
if (err)
goto out;
for (i = 0; i < md_len; i++)
printf("%02x", md[i]);
printf("\n");
out:
blkhash_free(h);
free(buf);
if (err) {
fprintf(stderr, "Example failed: %s\n", strerror(err));
exit(EXIT_FAILURE);
}
return 0;
}