1 /*
2  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License").
5  * You may not use this file except in compliance with the License.
6  * A copy of the License is located at
7  *
8  *  http://aws.amazon.com/apache2.0
9  *
10  * or in the "license" file accompanying this file. This file is distributed
11  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
12  * express or implied. See the License for the specific language governing
13  * permissions and limitations under the License.
14  */
15 
16 #pragma once
17 
18 #include "tls/s2n_connection.h"
19 #include "tls/s2n_prf.h"
20 
21 #include "crypto/s2n_hash.h"
22 
23 /* Allocationg new EVP structs is expensive, so we back them up here and reuse them */
24 struct s2n_connection_hmac_handles {
25     struct s2n_hmac_evp_backup initial_client;
26     struct s2n_hmac_evp_backup initial_client_copy;
27     struct s2n_hmac_evp_backup initial_server;
28     struct s2n_hmac_evp_backup secure_client;
29     struct s2n_hmac_evp_backup secure_client_copy;
30     struct s2n_hmac_evp_backup secure_server;
31 };
32 
33 extern int s2n_connection_save_hmac_state(struct s2n_connection_hmac_handles *hmac_handles, struct s2n_connection *conn);
34 extern int s2n_connection_restore_hmac_state(struct s2n_connection *conn, struct s2n_connection_hmac_handles *hmac_handles);
35