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/* Fluent Bit
* ==========
* Copyright (C) 2019-2020 The Fluent Bit Authors
*
* 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.
*/
#include <fluent-bit/flb_hash.h>
#include <openssl/bio.h>
static const EVP_MD *flb_crypto_get_digest_algorithm_instance_by_id(int algorithm_id)
{
const EVP_MD *algorithm;
if (algorithm_id == FLB_HASH_SHA256) {
algorithm = EVP_sha256();
}
else if (algorithm_id == FLB_HASH_SHA512) {
algorithm = EVP_sha512();
}
else if (algorithm_id == FLB_HASH_MD5) {
algorithm = EVP_md5();
}
else {
algorithm = NULL;
}
return algorithm;
}
int flb_hash_init(struct flb_hash *context, int hash_type)
{
const EVP_MD *digest_algorithm;
int result;
if (context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
digest_algorithm = flb_crypto_get_digest_algorithm_instance_by_id(hash_type);
if (digest_algorithm == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
context->backend_context = EVP_MD_CTX_create();
if (context->backend_context == NULL) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
result = EVP_DigestInit_ex(context->backend_context, digest_algorithm, 0);
if (result == 0) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
context->digest_size = EVP_MD_CTX_size(context->backend_context);
return FLB_CRYPTO_SUCCESS;
}
int flb_hash_finalize(struct flb_hash *context,
unsigned char *digest_buffer,
size_t digest_buffer_size)
{
unsigned int digest_length;
int result;
if (context->backend_context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (digest_buffer == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (digest_buffer_size < context->digest_size) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
result = EVP_DigestFinal_ex(context->backend_context,
digest_buffer, &digest_length);
if (result == 0) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
(void) digest_length;
return FLB_CRYPTO_SUCCESS;
}
int flb_hash_update(struct flb_hash *context,
unsigned char *data,
size_t data_length)
{
int result;
if (context->backend_context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (data == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
result = EVP_DigestUpdate(context->backend_context,
data,
data_length);
if (result == 0) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
return FLB_CRYPTO_SUCCESS;
}
int flb_hash_cleanup(struct flb_hash *context)
{
if (context->backend_context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
EVP_MD_CTX_destroy(context->backend_context);
context->backend_context = NULL;
return FLB_CRYPTO_SUCCESS;
}
int flb_hash_simple_batch(int hash_type,
size_t entry_count,
unsigned char **data_entries,
size_t *length_entries,
unsigned char *digest_buffer,
size_t digest_buffer_size)
{
struct flb_hash digest_context;
size_t entry_index;
int result;
result = flb_hash_init(&digest_context, hash_type);
if (result == FLB_CRYPTO_SUCCESS) {
for (entry_index = 0 ;
entry_index < entry_count && result == FLB_CRYPTO_SUCCESS;
entry_index++) {
if (data_entries[entry_index] != NULL &&
length_entries[entry_index] > 0) {
result = flb_hash_update(&digest_context,
data_entries[entry_index],
length_entries[entry_index]);
}
}
if (result == FLB_CRYPTO_SUCCESS) {
result = flb_hash_finalize(&digest_context,
digest_buffer,
digest_buffer_size);
}
flb_hash_cleanup(&digest_context);
}
return result;
}
int flb_hash_simple(int hash_type,
unsigned char *data,
size_t data_length,
unsigned char *digest_buffer,
size_t digest_buffer_size)
{
size_t length_entries[1];
unsigned char *data_entries[1];
data_entries[0] = data;
length_entries[0] = data_length;
return flb_hash_simple_batch(hash_type,
1,
data_entries,
length_entries,
digest_buffer,
digest_buffer_size);
}
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