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/*
* csum-sha256.c
*
* Copyright (C) 2014 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#include "sha256.h"
#include "csum.h"
#include "debug.h"
#define HASH_TYPE_SHA256 "SHA256 "
#define DIGEST_LEN_SHA256 32
static void sha256_checksum_block(char *buf, int len, unsigned char *digest)
{
sha256((unsigned char *)buf, len, digest, 0);
}
static int sha256_init_hash(unsigned int *ret_digest_len)
{
*ret_digest_len = DIGEST_LEN_SHA256;
return 0;
}
struct sha256_running_checksum {
sha256_context ctx;
};
DECLARE_RUNNING_CSUM_CAST_FUNCS(sha256_running_checksum);
static struct running_checksum *sha256_start_running_checksum(void)
{
struct sha256_running_checksum *c =
calloc(1, sizeof(struct sha256_running_checksum));
if (c) {
sha256_init(&c->ctx);
sha256_starts(&c->ctx, 0);
}
return priv_to_rc(c);
}
static void sha256_add_to_running_checksum(struct running_checksum *_c,
unsigned int len, unsigned char *buf)
{
struct sha256_running_checksum *c = rc_to_priv(_c);
sha256_update(&c->ctx, buf, len);
}
static void sha256_finish_running_checksum(struct running_checksum *_c,
unsigned char *digest)
{
struct sha256_running_checksum *c = rc_to_priv(_c);
sha256_finish(&c->ctx, digest);
sha256_free(&c->ctx);
free(c);
}
static struct csum_module_ops ops_sha256 = {
.init = sha256_init_hash,
.checksum_block = sha256_checksum_block,
.start_running_checksum = sha256_start_running_checksum,
.add_to_running_checksum = sha256_add_to_running_checksum,
.finish_running_checksum = sha256_finish_running_checksum,
};
struct csum_module csum_module_sha256 = {
.name = "SHA256",
.hash_type = HASH_TYPE_SHA256,
.ops = &ops_sha256,
};
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