pineapple-src/externals/libressl/crypto/evp/digest.c
2022-04-24 22:29:35 +02:00

429 lines
13 KiB
C
Executable file

/* $OpenBSD: digest.c,v 1.34 2022/01/10 10:51:31 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/opensslconf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "evp_locl.h"
int
EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
EVP_MD_CTX_init(ctx);
return EVP_DigestInit_ex(ctx, type, NULL);
}
int
EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
#ifndef OPENSSL_NO_ENGINE
/* 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 unecessary. */
if (ctx->engine && ctx->digest && (!type ||
(type && (type->type == ctx->digest->type))))
goto skip_to_init;
if (type) {
/* 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);
if (impl != NULL) {
if (!ENGINE_init(impl)) {
EVPerror(EVP_R_INITIALIZATION_ERROR);
return 0;
}
} else
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type->type);
if (impl != NULL) {
/* There's an ENGINE for this job ... (apparently) */
const EVP_MD *d = ENGINE_get_digest(impl, type->type);
if (d == NULL) {
/* Same comment from evp_enc.c */
EVPerror(EVP_R_INITIALIZATION_ERROR);
ENGINE_finish(impl);
return 0;
}
/* We'll use the ENGINE's private digest definition */
type = d;
/* Store the ENGINE functional reference so we know
* 'type' came from an ENGINE and we need to release
* it when done. */
ctx->engine = impl;
} else
ctx->engine = NULL;
} else if (!ctx->digest) {
EVPerror(EVP_R_NO_DIGEST_SET);
return 0;
}
#endif
if (ctx->digest != type) {
if (ctx->digest && ctx->digest->ctx_size && ctx->md_data &&
!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
freezero(ctx->md_data, ctx->digest->ctx_size);
ctx->md_data = NULL;
}
ctx->digest = type;
if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
ctx->update = type->update;
ctx->md_data = calloc(1, type->ctx_size);
if (ctx->md_data == NULL) {
EVP_PKEY_CTX_free(ctx->pctx);
ctx->pctx = NULL;
EVPerror(ERR_R_MALLOC_FAILURE);
return 0;
}
}
}
#ifndef OPENSSL_NO_ENGINE
skip_to_init:
#endif
if (ctx->pctx) {
int r;
r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
if (r <= 0 && (r != -2))
return 0;
}
if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
return 1;
return ctx->digest->init(ctx);
}
int
EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
{
return ctx->update(ctx, data, count);
}
/* The caller can assume that this removes any secret data from the context */
int
EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
{
int ret;
ret = EVP_DigestFinal_ex(ctx, md, size);
EVP_MD_CTX_cleanup(ctx);
return ret;
}
/* The caller can assume that this removes any secret data from the context */
int
EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
{
int ret;
if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) {
EVPerror(EVP_R_TOO_LARGE);
return 0;
}
ret = ctx->digest->final(ctx, md);
if (size != NULL)
*size = ctx->digest->md_size;
if (ctx->digest->cleanup) {
ctx->digest->cleanup(ctx);
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
}
memset(ctx->md_data, 0, ctx->digest->ctx_size);
return ret;
}
int
EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
EVP_MD_CTX_init(out);
return EVP_MD_CTX_copy_ex(out, in);
}
int
EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
unsigned char *tmp_buf;
if ((in == NULL) || (in->digest == NULL)) {
EVPerror(EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
#ifndef OPENSSL_NO_ENGINE
/* Make sure it's safe to copy a digest context using an ENGINE */
if (in->engine && !ENGINE_init(in->engine)) {
EVPerror(ERR_R_ENGINE_LIB);
return 0;
}
#endif
if (out->digest == in->digest) {
tmp_buf = out->md_data;
EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
} else
tmp_buf = NULL;
EVP_MD_CTX_cleanup(out);
memcpy(out, in, sizeof *out);
out->md_data = NULL;
out->pctx = NULL;
/*
* Because of the EVP_PKEY_CTX_dup() below, EVP_MD_CTX_cleanup() needs
* to free out->pctx in all cases (even if this flag is set on in).
*/
EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
if (in->md_data && out->digest->ctx_size) {
if (tmp_buf) {
out->md_data = tmp_buf;
} else {
out->md_data = calloc(1, out->digest->ctx_size);
if (out->md_data == NULL) {
EVPerror(ERR_R_MALLOC_FAILURE);
return 0;
}
}
memcpy(out->md_data, in->md_data, out->digest->ctx_size);
}
out->update = in->update;
if (in->pctx) {
out->pctx = EVP_PKEY_CTX_dup(in->pctx);
if (!out->pctx) {
EVP_MD_CTX_cleanup(out);
return 0;
}
}
if (out->digest->copy)
return out->digest->copy(out, in);
return 1;
}
int
EVP_Digest(const void *data, size_t count,
unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
{
EVP_MD_CTX ctx;
int ret;
EVP_MD_CTX_init(&ctx);
EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT);
ret = EVP_DigestInit_ex(&ctx, type, impl) &&
EVP_DigestUpdate(&ctx, data, count) &&
EVP_DigestFinal_ex(&ctx, md, size);
EVP_MD_CTX_cleanup(&ctx);
return ret;
}
EVP_MD_CTX *
EVP_MD_CTX_new(void)
{
return calloc(1, sizeof(EVP_MD_CTX));
}
void
EVP_MD_CTX_free(EVP_MD_CTX *ctx)
{
if (ctx == NULL)
return;
EVP_MD_CTX_cleanup(ctx);
free(ctx);
}
void
EVP_MD_CTX_init(EVP_MD_CTX *ctx)
{
memset(ctx, 0, sizeof(*ctx));
}
int
EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
{
return EVP_MD_CTX_cleanup(ctx);
}
EVP_MD_CTX *
EVP_MD_CTX_create(void)
{
return EVP_MD_CTX_new();
}
void
EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
{
EVP_MD_CTX_free(ctx);
}
/* This call frees resources associated with the context */
int
EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
{
/*
* 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))
freezero(ctx->md_data, ctx->digest->ctx_size);
/*
* If EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set, EVP_MD_CTX_set_pkey() was
* called and its strange API contract implies we don't own ctx->pctx.
*/
if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
EVP_PKEY_CTX_free(ctx->pctx);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(ctx->engine);
#endif
memset(ctx, 0, sizeof(*ctx));
return 1;
}
int
EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
{
int ret;
if (!ctx->digest) {
EVPerror(EVP_R_NO_CIPHER_SET);
return 0;
}
if (!ctx->digest->md_ctrl) {
EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED);
return 0;
}
ret = ctx->digest->md_ctrl(ctx, type, arg, ptr);
if (ret == -1) {
EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
return 0;
}
return ret;
}