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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"
typedef enum {
S2N_HMAC_NONE,
S2N_HMAC_MD5,
S2N_HMAC_SHA1,
S2N_HMAC_SHA224,
S2N_HMAC_SHA256,
S2N_HMAC_SHA384,
S2N_HMAC_SHA512,
S2N_HMAC_SSLv3_MD5,
S2N_HMAC_SSLv3_SHA1
} s2n_hmac_algorithm;
struct s2n_hmac_state {
s2n_hmac_algorithm alg;
uint16_t hash_block_size;
uint32_t currently_in_hash_block;
uint16_t xor_pad_size;
uint8_t digest_size;
struct s2n_hash_state inner;
struct s2n_hash_state inner_just_key;
struct s2n_hash_state outer;
struct s2n_hash_state outer_just_key;
/* key needs to be as large as the biggest block size */
uint8_t xor_pad[128];
/* For storing the inner digest */
uint8_t digest_pad[SHA512_DIGEST_LENGTH];
};
struct s2n_hmac_evp_backup {
struct s2n_hash_evp_digest inner;
struct s2n_hash_evp_digest inner_just_key;
struct s2n_hash_evp_digest outer;
struct s2n_hash_evp_digest outer_just_key;
};
extern int s2n_hmac_digest_size(s2n_hmac_algorithm alg, uint8_t *out);
extern bool s2n_hmac_is_available(s2n_hmac_algorithm alg);
extern int s2n_hmac_hash_alg(s2n_hmac_algorithm hmac_alg, s2n_hash_algorithm *out);
extern int s2n_hash_hmac_alg(s2n_hash_algorithm hash_alg, s2n_hmac_algorithm *out);
extern int s2n_hmac_new(struct s2n_hmac_state *state);
S2N_RESULT s2n_hmac_state_validate(struct s2n_hmac_state *state);
extern int s2n_hmac_init(struct s2n_hmac_state *state, s2n_hmac_algorithm alg, const void *key, uint32_t klen);
extern int s2n_hmac_update(struct s2n_hmac_state *state, const void *in, uint32_t size);
extern int s2n_hmac_digest(struct s2n_hmac_state *state, void *out, uint32_t size);
extern int s2n_hmac_digest_two_compression_rounds(struct s2n_hmac_state *state, void *out, uint32_t size);
extern int s2n_hmac_digest_verify(const void *a, const void *b, uint32_t len);
extern int s2n_hmac_free(struct s2n_hmac_state *state);
extern int s2n_hmac_reset(struct s2n_hmac_state *state);
extern int s2n_hmac_copy(struct s2n_hmac_state *to, struct s2n_hmac_state *from);
extern int s2n_hmac_save_evp_hash_state(struct s2n_hmac_evp_backup* backup, struct s2n_hmac_state* hmac);
extern int s2n_hmac_restore_evp_hash_state(struct s2n_hmac_evp_backup* backup, struct s2n_hmac_state* hmac);
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