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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_hash.h"
#include "crypto/s2n_hmac.h"
#include "crypto/s2n_openssl.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
#if defined(OPENSSL_IS_AWSLC)
#define S2N_LIBCRYPTO_SUPPORTS_TLS_PRF 1
#else
#define S2N_LIBCRYPTO_SUPPORTS_TLS_PRF 0
#endif
union p_hash_state {
struct s2n_hmac_state s2n_hmac;
struct s2n_evp_hmac_state evp_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];
};
/* The s2n p_hash implementation is abstracted to allow for separate implementations, using
* either s2n's formally verified HMAC or OpenSSL's EVP HMAC, for use by the TLS PRF. */
struct s2n_p_hash_hmac {
int (*alloc)(struct s2n_prf_working_space *ws);
int (*init)(struct s2n_prf_working_space *ws, s2n_hmac_algorithm alg, struct s2n_blob *secret);
int (*update)(struct s2n_prf_working_space *ws, const void *data, uint32_t size);
int (*final)(struct s2n_prf_working_space *ws, void *digest, uint32_t size);
int (*reset)(struct s2n_prf_working_space *ws);
int (*cleanup)(struct s2n_prf_working_space *ws);
int (*free)(struct s2n_prf_working_space *ws);
};
/* 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);
#include "tls/s2n_connection.h"
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(struct s2n_connection *conn, struct s2n_blob *secret, struct s2n_blob *label, struct s2n_blob *seed_a,
struct s2n_blob *seed_b, struct s2n_blob *seed_c, struct s2n_blob *out);
int s2n_prf_calculate_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret);
int s2n_tls_prf_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret);
int s2n_hybrid_prf_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret);
S2N_RESULT s2n_tls_prf_extended_master_secret(struct s2n_connection *conn, struct s2n_blob *premaster_secret, struct s2n_blob *session_hash, struct s2n_blob *sha1_hash);
S2N_RESULT s2n_prf_get_digest_for_ems(struct s2n_connection *conn, struct s2n_blob *message, s2n_hash_algorithm hash_alg, struct s2n_blob *output);
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);
bool s2n_libcrypto_supports_tls_prf();
S2N_RESULT s2n_custom_prf(struct s2n_connection *conn, struct s2n_blob *secret, struct s2n_blob *label,
struct s2n_blob *seed_a, struct s2n_blob *seed_b, struct s2n_blob *seed_c, struct s2n_blob *out);
S2N_RESULT s2n_libcrypto_prf(struct s2n_connection *conn, struct s2n_blob *secret, struct s2n_blob *label,
struct s2n_blob *seed_a, struct s2n_blob *seed_b, struct s2n_blob *seed_c, struct s2n_blob *out);
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