/*
* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/engine.h>
#include <openssl/params.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "crypto/evp.h"
#include "internal/provider.h"
#include "evp_local.h"
/* This call frees resources associated with the context */
int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
{
if (ctx == NULL)
return 1;
#ifndef FIPS_MODE
/* TODO(3.0): Temporarily no support for EVP_DigestSign* in FIPS module */
/*
* pctx should be freed by the user of EVP_MD_CTX
* if EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set
*/
if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
EVP_PKEY_CTX_free(ctx->pctx);
#endif
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = NULL;
ctx->reqdigest = NULL;
if (ctx->provctx != NULL) {
if (ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->provctx);
ctx->provctx = NULL;
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
}
/* TODO(3.0): Remove legacy code below */
/*
* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
* sometimes only copies of the context are ever finalised.
*/
if (ctx->digest && ctx->digest->cleanup
&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
ctx->digest->cleanup(ctx);
if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
}
#if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
ENGINE_finish(ctx->engine);
#endif
/* TODO(3.0): End of legacy code */
OPENSSL_cleanse(ctx, sizeof(*ctx));
return 1;
}
EVP_MD_CTX *EVP_MD_CTX_new(void)
{
return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
}
void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
{
if (ctx == NULL)
return;
EVP_MD_CTX_reset(ctx);
OPENSSL_free(ctx);
return;
}
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
EVP_MD_CTX_reset(ctx);
return EVP_DigestInit_ex(ctx, type, NULL);
}
int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
ENGINE *tmpimpl = NULL;
#endif
EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
if (ctx->provctx != NULL) {
if (!ossl_assert(ctx->digest != NULL)) {
EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
return 0;
}
if (ctx->digest->freectx != NULL)
ctx->digest->freectx(ctx->provctx);
ctx->provctx = NULL;
}
if (type != NULL)
ctx->reqdigest = type;
/* TODO(3.0): Legacy work around code below. Remove this */
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
/*
* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
* this context may already have an ENGINE! Try to avoid releasing the
* previous handle, re-querying for an ENGINE, and having a
* reinitialisation, when it may all be unnecessary.
*/
if (ctx->engine && ctx->digest &&
(type == NULL || (type->type == ctx->digest->type)))
goto skip_to_init;
if (type != NULL) {
/*
* Ensure an ENGINE left lying around from last time is cleared (the
* previous check attempted to avoid this if the same ENGINE and
* EVP_MD could be used).
*/
ENGINE_finish(ctx->engine);
ctx->engine = NULL;
}
if (type != NULL && impl == NULL)
tmpimpl = ENGINE_get_digest_engine(type->type);
#endif
/*
* If there are engines involved or EVP_MD_CTX_FLAG_NO_INIT is set then we
* should use legacy handling for now.
*/
if (ctx->engine != NULL
|| impl != NULL
#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
|| tmpimpl != NULL
#endif
|| (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0) {
if (ctx->digest == ctx->fetched_digest)
ctx->digest = NULL;
EVP_MD_free(ctx->fetched_digest);
ctx->fetched_digest = NULL;
goto legacy;
}
if (ctx->digest != NULL && ctx->digest->ctx_size > 0) {
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
ctx->md_data = NULL;
}
/* TODO(3.0): Start of non-legacy code below */
if (type->prov == NULL) {