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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 <stdbool.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include "crypto/s2n_evp.h"
#define S2N_MAX_DIGEST_LEN SHA512_DIGEST_LENGTH
typedef enum {
S2N_HASH_NONE=0,
S2N_HASH_MD5,
S2N_HASH_SHA1,
S2N_HASH_SHA224,
S2N_HASH_SHA256,
S2N_HASH_SHA384,
S2N_HASH_SHA512,
S2N_HASH_MD5_SHA1,
/* Don't add any hash algorithms below S2N_HASH_SENTINEL */
S2N_HASH_SENTINEL
} s2n_hash_algorithm;
/* The low_level_digest stores all OpenSSL structs that are alg-specific to be used with OpenSSL's low-level hash API's. */
union s2n_hash_low_level_digest {
MD5_CTX md5;
SHA_CTX sha1;
SHA256_CTX sha224;
SHA256_CTX sha256;
SHA512_CTX sha384;
SHA512_CTX sha512;
struct {
MD5_CTX md5;
SHA_CTX sha1;
} md5_sha1;
};
/* The evp_digest stores all OpenSSL structs to be used with OpenSSL's EVP hash API's. */
struct s2n_hash_evp_digest {
struct s2n_evp_digest evp;
/* Always store a secondary evp_digest to allow resetting a hash_state to MD5_SHA1 from another alg. */
struct s2n_evp_digest evp_md5_secondary;
};
/* s2n_hash_state stores the s2n_hash implementation being used (low-level or EVP),
* the hash algorithm being used at the time, and either low_level or high_level (EVP) OpenSSL digest structs.
*/
struct s2n_hash_state {
const struct s2n_hash *hash_impl;
s2n_hash_algorithm alg;
uint8_t is_ready_for_input;
uint64_t currently_in_hash;
union {
union s2n_hash_low_level_digest low_level;
struct s2n_hash_evp_digest high_level;
} digest;
};
/* The s2n hash implementation is abstracted to allow for separate implementations, using
* either OpenSSL's low-level algorithm-specific API's or OpenSSL's EVP API's.
*/
struct s2n_hash {
int (*alloc) (struct s2n_hash_state *state);
int (*allow_md5_for_fips) (struct s2n_hash_state *state);
int (*init) (struct s2n_hash_state *state, s2n_hash_algorithm alg);
int (*update) (struct s2n_hash_state *state, const void *data, uint32_t size);
int (*digest) (struct s2n_hash_state *state, void *out, uint32_t size);
int (*copy) (struct s2n_hash_state *to, struct s2n_hash_state *from);
int (*reset) (struct s2n_hash_state *state);
int (*free) (struct s2n_hash_state *state);
};
bool s2n_hash_evp_fully_supported();
const EVP_MD* s2n_hash_alg_to_evp_md(s2n_hash_algorithm alg);
extern int s2n_hash_digest_size(s2n_hash_algorithm alg, uint8_t *out);
extern int s2n_hash_block_size(s2n_hash_algorithm alg, uint64_t *block_size);
extern bool s2n_hash_is_available(s2n_hash_algorithm alg);
extern int s2n_hash_is_ready_for_input(struct s2n_hash_state *state);
extern int s2n_hash_new(struct s2n_hash_state *state);
S2N_RESULT s2n_hash_state_validate(struct s2n_hash_state *state);
extern int s2n_hash_allow_md5_for_fips(struct s2n_hash_state *state);
extern int s2n_hash_init(struct s2n_hash_state *state, s2n_hash_algorithm alg);
extern int s2n_hash_update(struct s2n_hash_state *state, const void *data, uint32_t size);
extern int s2n_hash_digest(struct s2n_hash_state *state, void *out, uint32_t size);
extern int s2n_hash_copy(struct s2n_hash_state *to, struct s2n_hash_state *from);
extern int s2n_hash_reset(struct s2n_hash_state *state);
extern int s2n_hash_free(struct s2n_hash_state *state);
extern int s2n_hash_get_currently_in_hash_total(struct s2n_hash_state *state, uint64_t *out);
extern int s2n_hash_const_time_get_currently_in_hash_block(struct s2n_hash_state *state, uint64_t *out);
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