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 <stdint.h>
19 #include <openssl/sha.h>
20 #include <openssl/md5.h>
21 
22 #include "crypto/s2n_evp.h"
23 
24 #define S2N_MAX_DIGEST_LEN SHA512_DIGEST_LENGTH
25 
26 typedef enum {
27     S2N_HASH_NONE,
28     S2N_HASH_MD5,
29     S2N_HASH_SHA1,
30     S2N_HASH_SHA224,
31     S2N_HASH_SHA256,
32     S2N_HASH_SHA384,
33     S2N_HASH_SHA512,
34     S2N_HASH_MD5_SHA1,
35     /* Don't add any hash algorithms below S2N_HASH_SENTINEL */
36     S2N_HASH_SENTINEL
37 } s2n_hash_algorithm;
38 
39 struct s2n_hash_state {
40   s2n_hash_algorithm alg;
41   int currently_in_hash_block;
42 };
43 
44 /* SHA1
45  * These fields were determined from the SHA specification, augmented by
46  * analyzing SHA implementations.
47  * PER_BLOCK_COST is the cost of a compression round.  Pessimistically assume
48  * it is 1000 cycles/block, which is worse than real implementations (larger
49  * numbers here make lucky13 leakages look worse), and hence large is safer.
50  * PER_BYTE_COST is the cost of memcopy one byte that is already in cache,
51  * to a location already in cache.
52  */
53 enum {
54   PER_BLOCK_COST = 1000,
55   PER_BYTE_COST = 1,
56   BLOCK_SIZE = 64,
57   LENGTH_FIELD_SIZE = 8,
58   DIGEST_SIZE = 20
59 };
60 
61 #define MAX_SIZE 1024
62 
63 enum {
64   SUCCESS = 0,
65   FAILURE = -1
66 };
67 
68 extern int s2n_hash_digest_size(s2n_hash_algorithm alg, uint8_t *out);
69 extern int s2n_hash_new(struct s2n_hash_state *state);
70 S2N_RESULT s2n_hash_state_validate(struct s2n_hash_state *state);
71 extern int s2n_hash_init(struct s2n_hash_state *state, s2n_hash_algorithm alg);
72 extern int s2n_hash_update(struct s2n_hash_state *state, const void *data, uint32_t size);
73 extern int s2n_hash_digest(struct s2n_hash_state *state, void *out, uint32_t size);
74 extern int s2n_hash_copy(struct s2n_hash_state *to, struct s2n_hash_state *from);
75 extern int s2n_hash_reset(struct s2n_hash_state *state);
76 extern int s2n_hash_free(struct s2n_hash_state *state);
77 extern int s2n_hash_get_currently_in_hash_total(struct s2n_hash_state *state, uint64_t *out);
78