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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#pragma once
#include <stdint.h>
#include "crypto/s2n_hmac.h"
#include "tls/s2n_connection.h"
#include "utils/s2n_blob.h"
/* Enough to support TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, 2*SHA384_DIGEST_LEN + 2*AES256_KEY_SIZE */
#define S2N_MAX_KEY_BLOCK_LEN 160
union p_hash_state {
struct s2n_hmac_state s2n_hmac;
};
struct s2n_prf_working_space {
union p_hash_state p_hash;
uint8_t digest0[S2N_MAX_DIGEST_LEN];
uint8_t digest1[S2N_MAX_DIGEST_LEN];
};
/* TLS key expansion results in an array of contiguous data which is then
* interpreted as the MAC, KEY and IV for the client and server.
*
* The following is the memory layout of the key material:
*
* [ CLIENT_MAC, SERVER_MAC, CLIENT_KEY, SERVER_KEY, CLIENT_IV, SERVER_IV ]
*/
struct s2n_key_material {
/* key material data resulting from key expansion */
uint8_t key_block[S2N_MAX_KEY_BLOCK_LEN];
/* pointers into data representing specific key information */
struct s2n_blob client_mac;
struct s2n_blob server_mac;
struct s2n_blob client_key;
struct s2n_blob server_key;
struct s2n_blob client_iv;
struct s2n_blob server_iv;
};
S2N_RESULT s2n_key_material_init(struct s2n_key_material *key_material, struct s2n_connection *conn);
S2N_RESULT s2n_prf_new(struct s2n_connection *conn);
S2N_RESULT s2n_prf_wipe(struct s2n_connection *conn);
S2N_RESULT s2n_prf_free(struct s2n_connection *conn);
int s2n_prf_calculate_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret);
int s2n_prf_hybrid_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret);
S2N_RESULT s2n_prf_generate_key_material(struct s2n_connection *conn, struct s2n_key_material *key_material);
int s2n_prf_key_expansion(struct s2n_connection *conn);
int s2n_prf_server_finished(struct s2n_connection *conn);
int s2n_prf_client_finished(struct s2n_connection *conn);
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