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- /* 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) 1998-2007 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).
- *
- */
- /* ====================================================================
- * Copyright 2005 Nokia. All rights reserved.
- *
- * The portions of the attached software ("Contribution") is developed by
- * Nokia Corporation and is licensed pursuant to the OpenSSL open source
- * license.
- *
- * The Contribution, originally written by Mika Kousa and Pasi Eronen of
- * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
- * support (see RFC 4279) to OpenSSL.
- *
- * No patent licenses or other rights except those expressly stated in
- * the OpenSSL open source license shall be deemed granted or received
- * expressly, by implication, estoppel, or otherwise.
- *
- * No assurances are provided by Nokia that the Contribution does not
- * infringe the patent or other intellectual property rights of any third
- * party or that the license provides you with all the necessary rights
- * to make use of the Contribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
- * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
- * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
- * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
- * OTHERWISE. */
-
- #include <openssl/ssl.h>
-
- #include <openssl/buf.h>
- #include <openssl/digest.h>
-
- #include "internal.h"
-
-
- namespace bssl {
-
- SSLTranscript::SSLTranscript() {}
-
- SSLTranscript::~SSLTranscript() {}
-
- bool SSLTranscript::Init() {
- buffer_.reset(BUF_MEM_new());
- if (!buffer_) {
- return false;
- }
-
- hash_.Reset();
- return true;
- }
-
- // InitDigestWithData calls |EVP_DigestInit_ex| on |ctx| with |md| and then
- // writes the data in |buf| to it.
- static bool InitDigestWithData(EVP_MD_CTX *ctx, const EVP_MD *md,
- const BUF_MEM *buf) {
- if (!EVP_DigestInit_ex(ctx, md, NULL)) {
- return false;
- }
- EVP_DigestUpdate(ctx, buf->data, buf->length);
- return true;
- }
-
- bool SSLTranscript::InitHash(uint16_t version, const SSL_CIPHER *cipher) {
- const EVP_MD *md = ssl_get_handshake_digest(version, cipher);
- return InitDigestWithData(hash_.get(), md, buffer_.get());
- }
-
- void SSLTranscript::FreeBuffer() {
- buffer_.reset();
- }
-
- size_t SSLTranscript::DigestLen() const {
- return EVP_MD_size(Digest());
- }
-
- const EVP_MD *SSLTranscript::Digest() const {
- return EVP_MD_CTX_md(hash_.get());
- }
-
- bool SSLTranscript::UpdateForHelloRetryRequest() {
- if (buffer_) {
- buffer_->length = 0;
- }
-
- uint8_t old_hash[EVP_MAX_MD_SIZE];
- size_t hash_len;
- if (!GetHash(old_hash, &hash_len)) {
- return false;
- }
- const uint8_t header[4] = {SSL3_MT_MESSAGE_HASH, 0, 0,
- static_cast<uint8_t>(hash_len)};
- if (!EVP_DigestInit_ex(hash_.get(), Digest(), nullptr) ||
- !Update(header) ||
- !Update(MakeConstSpan(old_hash, hash_len))) {
- return false;
- }
- return true;
- }
-
- bool SSLTranscript::CopyHashContext(EVP_MD_CTX *ctx) {
- return EVP_MD_CTX_copy_ex(ctx, hash_.get());
- }
-
- bool SSLTranscript::Update(Span<const uint8_t> in) {
- // Depending on the state of the handshake, either the handshake buffer may be
- // active, the rolling hash, or both.
- if (buffer_ &&
- !BUF_MEM_append(buffer_.get(), in.data(), in.size())) {
- return false;
- }
-
- if (EVP_MD_CTX_md(hash_.get()) != NULL) {
- EVP_DigestUpdate(hash_.get(), in.data(), in.size());
- }
-
- return true;
- }
-
- bool SSLTranscript::GetHash(uint8_t *out, size_t *out_len) {
- ScopedEVP_MD_CTX ctx;
- unsigned len;
- if (!EVP_MD_CTX_copy_ex(ctx.get(), hash_.get()) ||
- !EVP_DigestFinal_ex(ctx.get(), out, &len)) {
- return false;
- }
- *out_len = len;
- return true;
- }
-
- bool SSLTranscript::GetFinishedMAC(uint8_t *out, size_t *out_len,
- const SSL_SESSION *session,
- bool from_server) {
- static const char kClientLabel[] = "client finished";
- static const char kServerLabel[] = "server finished";
- auto label = from_server
- ? MakeConstSpan(kServerLabel, sizeof(kServerLabel) - 1)
- : MakeConstSpan(kClientLabel, sizeof(kClientLabel) - 1);
-
- uint8_t digest[EVP_MAX_MD_SIZE];
- size_t digest_len;
- if (!GetHash(digest, &digest_len)) {
- return false;
- }
-
- static const size_t kFinishedLen = 12;
- if (!tls1_prf(Digest(), MakeSpan(out, kFinishedLen),
- MakeConstSpan(session->master_key, session->master_key_length),
- label, MakeConstSpan(digest, digest_len), {})) {
- return false;
- }
-
- *out_len = kFinishedLen;
- return true;
- }
-
- } // namespace bssl
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