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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#include <stdio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/opensslv.h>
#include <isc/md.h>
#include <isc/util.h>
#include "openssl_shim.h"
isc_md_t *
isc_md_new(void) {
isc_md_t *md = EVP_MD_CTX_new();
RUNTIME_CHECK(md != NULL);
return (md);
}
void
isc_md_free(isc_md_t *md) {
if (md == NULL) {
return;
}
EVP_MD_CTX_free(md);
}
isc_result_t
isc_md_init(isc_md_t *md, const isc_md_type_t *md_type) {
REQUIRE(md != NULL);
if (md_type == NULL) {
return (ISC_R_NOTIMPLEMENTED);
}
if (EVP_DigestInit_ex(md, md_type, NULL) != 1) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
return (ISC_R_SUCCESS);
}
isc_result_t
isc_md_reset(isc_md_t *md) {
REQUIRE(md != NULL);
if (EVP_MD_CTX_reset(md) != 1) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
return (ISC_R_SUCCESS);
}
isc_result_t
isc_md_update(isc_md_t *md, const unsigned char *buf, const size_t len) {
REQUIRE(md != NULL);
if (buf == NULL || len == 0) {
return (ISC_R_SUCCESS);
}
if (EVP_DigestUpdate(md, buf, len) != 1) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
return (ISC_R_SUCCESS);
}
isc_result_t
isc_md_final(isc_md_t *md, unsigned char *digest, unsigned int *digestlen) {
REQUIRE(md != NULL);
REQUIRE(digest != NULL);
if (EVP_DigestFinal_ex(md, digest, digestlen) != 1) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
return (ISC_R_SUCCESS);
}
const isc_md_type_t *
isc_md_get_md_type(isc_md_t *md) {
REQUIRE(md != NULL);
return (EVP_MD_CTX_get0_md(md));
}
size_t
isc_md_get_size(isc_md_t *md) {
REQUIRE(md != NULL);
return (EVP_MD_CTX_size(md));
}
size_t
isc_md_get_block_size(isc_md_t *md) {
REQUIRE(md != NULL);
return (EVP_MD_CTX_block_size(md));
}
size_t
isc_md_type_get_size(const isc_md_type_t *md_type) {
STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE,
"Change ISC_MAX_MD_SIZE to be greater than or equal to "
"EVP_MAX_MD_SIZE");
if (md_type != NULL) {
return ((size_t)EVP_MD_size(md_type));
}
return (ISC_MAX_MD_SIZE);
}
size_t
isc_md_type_get_block_size(const isc_md_type_t *md_type) {
STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE,
"Change ISC_MAX_MD_SIZE to be greater than or equal to "
"EVP_MAX_MD_SIZE");
if (md_type != NULL) {
return ((size_t)EVP_MD_block_size(md_type));
}
return (ISC_MAX_MD_SIZE);
}
isc_result_t
isc_md(const isc_md_type_t *md_type, const unsigned char *buf, const size_t len,
unsigned char *digest, unsigned int *digestlen) {
isc_md_t *md;
isc_result_t res;
md = isc_md_new();
res = isc_md_init(md, md_type);
if (res != ISC_R_SUCCESS) {
goto end;
}
res = isc_md_update(md, buf, len);
if (res != ISC_R_SUCCESS) {
goto end;
}
res = isc_md_final(md, digest, digestlen);
if (res != ISC_R_SUCCESS) {
goto end;
}
end:
isc_md_free(md);
return (res);
}
#define md_register_algorithm(alg) \
const isc_md_type_t *isc__md_##alg(void) { \
const isc_md_type_t *value = EVP_##alg(); \
if (value == NULL) { \
ERR_clear_error(); \
} \
return (value); \
}
md_register_algorithm(md5);
md_register_algorithm(sha1);
md_register_algorithm(sha224);
md_register_algorithm(sha256);
md_register_algorithm(sha384);
md_register_algorithm(sha512);
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