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-rw-r--r--lib/isc/md.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/lib/isc/md.c b/lib/isc/md.c
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+++ b/lib/isc/md.c
@@ -0,0 +1,185 @@
+/*
+ * 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);