--- /dev/null
+/*
+ * DTLS implementation written by Nagendra Modadugu
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2005 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 <openssl/ssl.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include <openssl/buf.h>
+#include <openssl/err.h>
+
+#include "../crypto/internal.h"
+#include "internal.h"
+
+
+using namespace bssl;
+
+static void dtls1_on_handshake_complete(SSL *ssl) {
+ // Stop the reply timer left by the last flight we sent.
+ dtls1_stop_timer(ssl);
+ // If the final flight had a reply, we know the peer has received it. If not,
+ // we must leave the flight around for post-handshake retransmission.
+ if (ssl->d1->flight_has_reply) {
+ dtls_clear_outgoing_messages(ssl);
+ }
+}
+
+static bool dtls1_set_read_state(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx) {
+ // Cipher changes are forbidden if the current epoch has leftover data.
+ if (dtls_has_unprocessed_handshake_data(ssl)) {
+ OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE);
+ ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
+ return false;
+ }
+
+ ssl->d1->r_epoch++;
+ OPENSSL_memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap));
+ OPENSSL_memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence));
+
+ ssl->s3->aead_read_ctx = std::move(aead_ctx);
+ return true;
+}
+
+static bool dtls1_set_write_state(SSL *ssl,
+ UniquePtr<SSLAEADContext> aead_ctx) {
+ ssl->d1->w_epoch++;
+ OPENSSL_memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence,
+ sizeof(ssl->s3->write_sequence));
+ OPENSSL_memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
+
+ ssl->d1->last_aead_write_ctx = std::move(ssl->s3->aead_write_ctx);
+ ssl->s3->aead_write_ctx = std::move(aead_ctx);
+ return true;
+}
+
+static const SSL_PROTOCOL_METHOD kDTLSProtocolMethod = {
+ true /* is_dtls */,
+ dtls1_new,
+ dtls1_free,
+ dtls1_get_message,
+ dtls1_next_message,
+ dtls1_open_handshake,
+ dtls1_open_change_cipher_spec,
+ dtls1_open_app_data,
+ dtls1_write_app_data,
+ dtls1_dispatch_alert,
+ dtls1_init_message,
+ dtls1_finish_message,
+ dtls1_add_message,
+ dtls1_add_change_cipher_spec,
+ dtls1_add_alert,
+ dtls1_flush_flight,
+ dtls1_on_handshake_complete,
+ dtls1_set_read_state,
+ dtls1_set_write_state,
+};
+
+const SSL_METHOD *DTLS_method(void) {
+ static const SSL_METHOD kMethod = {
+ 0,
+ &kDTLSProtocolMethod,
+ &ssl_crypto_x509_method,
+ };
+ return &kMethod;
+}
+
+const SSL_METHOD *DTLS_with_buffers_method(void) {
+ static const SSL_METHOD kMethod = {
+ 0,
+ &kDTLSProtocolMethod,
+ &ssl_noop_x509_method,
+ };
+ return &kMethod;
+}
+
+// Legacy version-locked methods.
+
+const SSL_METHOD *DTLSv1_2_method(void) {
+ static const SSL_METHOD kMethod = {
+ DTLS1_2_VERSION,
+ &kDTLSProtocolMethod,
+ &ssl_crypto_x509_method,
+ };
+ return &kMethod;
+}
+
+const SSL_METHOD *DTLSv1_method(void) {
+ static const SSL_METHOD kMethod = {
+ DTLS1_VERSION,
+ &kDTLSProtocolMethod,
+ &ssl_crypto_x509_method,
+ };
+ return &kMethod;
+}
+
+// Legacy side-specific methods.
+
+const SSL_METHOD *DTLSv1_2_server_method(void) {
+ return DTLSv1_2_method();
+}
+
+const SSL_METHOD *DTLSv1_server_method(void) {
+ return DTLSv1_method();
+}
+
+const SSL_METHOD *DTLSv1_2_client_method(void) {
+ return DTLSv1_2_method();
+}
+
+const SSL_METHOD *DTLSv1_client_method(void) {
+ return DTLSv1_method();
+}
+
+const SSL_METHOD *DTLS_server_method(void) {
+ return DTLS_method();
+}
+
+const SSL_METHOD *DTLS_client_method(void) {
+ return DTLS_method();
+}
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