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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Contact: Krzysztof Jackiewicz <k.jackiewicz@samsung.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
/**
* @file digest.c
* @brief
*/
#include <assert.h>
#include <openssl/evp.h>
#include <yaca_crypto.h>
#include <yaca_digest.h>
#include <yaca_error.h>
#include "internal.h"
static const struct {
yaca_digest_algorithm_e algo;
const EVP_MD *(*digest)(void);
} MESSAGE_DIGESTS[] = {
{YACA_DIGEST_MD5, EVP_md5},
{YACA_DIGEST_SHA1, EVP_sha1},
{YACA_DIGEST_SHA224, EVP_sha224},
{YACA_DIGEST_SHA256, EVP_sha256},
{YACA_DIGEST_SHA384, EVP_sha384},
{YACA_DIGEST_SHA512, EVP_sha512},
};
static const size_t MESSAGE_DIGESTS_SIZE = sizeof(MESSAGE_DIGESTS) / sizeof(MESSAGE_DIGESTS[0]);
struct yaca_digest_context_s {
struct yaca_context_s ctx;
EVP_MD_CTX *md_ctx;
enum context_state_e state;
};
static bool CTX_DEFAULT_STATES[CTX_COUNT][CTX_COUNT] = {
/* from \ to INIT, MSG, FIN */
/* INIT */ { 0, 1, 1 },
/* MSG */ { 0, 1, 1 },
/* FIN */ { 0, 0, 0 },
};
static bool verify_state_change(struct yaca_digest_context_s *c, enum context_state_e to)
{
int from = c->state;
return CTX_DEFAULT_STATES[from][to];
}
static struct yaca_digest_context_s *get_digest_context(const yaca_context_h ctx)
{
if (ctx == YACA_CONTEXT_NULL)
return NULL;
switch (ctx->type) {
case YACA_CONTEXT_DIGEST:
return (struct yaca_digest_context_s *)ctx;
default:
return NULL;
}
}
static int get_digest_output_length(const yaca_context_h ctx,
size_t input_len,
size_t *output_len)
{
assert(output_len != NULL);
struct yaca_digest_context_s *c = get_digest_context(ctx);
if (c == NULL || input_len != 0)
return YACA_ERROR_INVALID_PARAMETER;
int md_size = EVP_MD_CTX_size(c->md_ctx);
if (md_size <= 0)
return YACA_ERROR_INTERNAL;
*output_len = md_size;
return YACA_ERROR_NONE;
}
static void destroy_digest_context(yaca_context_h ctx)
{
struct yaca_digest_context_s *c = get_digest_context(ctx);
if (c == NULL)
return;
EVP_MD_CTX_destroy(c->md_ctx);
c->md_ctx = NULL;
}
int digest_get_algorithm(yaca_digest_algorithm_e algo, const EVP_MD **md)
{
int ret;
size_t i;
assert(md != NULL);
*md = NULL;
ret = YACA_ERROR_INVALID_PARAMETER;
for (i = 0; i < MESSAGE_DIGESTS_SIZE; ++i)
if (MESSAGE_DIGESTS[i].algo == algo) {
*md = MESSAGE_DIGESTS[i].digest();
ret = YACA_ERROR_NONE;
break;
}
if (ret == YACA_ERROR_NONE && *md == NULL) {
ret = YACA_ERROR_INTERNAL;
ERROR_DUMP(ret);
}
return ret;
}
API int yaca_digest_initialize(yaca_context_h *ctx, yaca_digest_algorithm_e algo)
{
int ret;
struct yaca_digest_context_s *nc = NULL;
const EVP_MD *md;
if (ctx == NULL)
return YACA_ERROR_INVALID_PARAMETER;
ret = yaca_zalloc(sizeof(struct yaca_digest_context_s), (void**)&nc);
if (ret != YACA_ERROR_NONE)
return ret;
nc->ctx.type = YACA_CONTEXT_DIGEST;
nc->ctx.context_destroy = destroy_digest_context;
nc->ctx.get_output_length = get_digest_output_length;
nc->ctx.set_property = NULL;
nc->ctx.get_property = NULL;
ret = digest_get_algorithm(algo, &md);
if (ret != YACA_ERROR_NONE)
goto exit;
nc->md_ctx = EVP_MD_CTX_create();
if (nc->md_ctx == NULL) {
ret = YACA_ERROR_INTERNAL;
ERROR_DUMP(ret);
goto exit;
}
ret = EVP_DigestInit(nc->md_ctx, md);
if (ret != 1) {
ret = YACA_ERROR_INTERNAL;
ERROR_DUMP(ret);
goto exit;
}
nc->state = CTX_INITIALIZED;
*ctx = (yaca_context_h)nc;
nc = NULL;
ret = YACA_ERROR_NONE;
exit:
yaca_context_destroy((yaca_context_h)nc);
return ret;
}
API int yaca_digest_update(yaca_context_h ctx, const char *message, size_t message_len)
{
struct yaca_digest_context_s *c = get_digest_context(ctx);
int ret;
if (c == NULL || message == NULL || message_len == 0)
return YACA_ERROR_INVALID_PARAMETER;
if (!verify_state_change(c, CTX_MSG_UPDATED))
return YACA_ERROR_INVALID_PARAMETER;
ret = EVP_DigestUpdate(c->md_ctx, message, message_len);
if (ret != 1) {
ret = YACA_ERROR_INTERNAL;
ERROR_DUMP(ret);
return ret;
}
c->state = CTX_MSG_UPDATED;
return YACA_ERROR_NONE;
}
API int yaca_digest_finalize(yaca_context_h ctx, char *digest, size_t *digest_len)
{
struct yaca_digest_context_s *c = get_digest_context(ctx);
int ret;
unsigned len = 0;
if (c == NULL || digest == NULL || digest_len == NULL)
return YACA_ERROR_INVALID_PARAMETER;
if (!verify_state_change(c, CTX_FINALIZED))
return YACA_ERROR_INVALID_PARAMETER;
ret = EVP_DigestFinal_ex(c->md_ctx, (unsigned char*)digest, &len);
if (ret != 1) {
ret = YACA_ERROR_INTERNAL;
ERROR_DUMP(ret);
return ret;
}
c->state = CTX_FINALIZED;
*digest_len = len;
return YACA_ERROR_NONE;
}
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