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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Utility functions for file and key handling.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "2sysincludes.h"
#include "2common.h"
#include "2sha.h"
#include "file_keys.h"
#include "host_common.h"
#include "signature_digest.h"
int DigestFile(char *input_file, enum vb2_hash_algorithm alg,
uint8_t *digest, uint32_t digest_size)
{
int input_fd, len;
uint8_t data[VB2_SHA1_BLOCK_SIZE];
struct vb2_digest_context ctx;
if( (input_fd = open(input_file, O_RDONLY)) == -1 ) {
fprintf(stderr, "Couldn't open %s\n", input_file);
return VB2_ERROR_UNKNOWN;
}
vb2_digest_init(&ctx, alg);
while ((len = read(input_fd, data, sizeof(data))) == sizeof(data))
vb2_digest_extend(&ctx, data, len);
if (len != -1)
vb2_digest_extend(&ctx, data, len);
close(input_fd);
return vb2_digest_finalize(&ctx, digest, digest_size);
}
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