1 53bf0b54 2023-02-23 op /*
 2 53bf0b54 2023-02-23 op  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
 3 53bf0b54 2023-02-23 op  *
 4 53bf0b54 2023-02-23 op  * Permission to use, copy, modify, and distribute this software for any
 5 53bf0b54 2023-02-23 op  * purpose with or without fee is hereby granted, provided that the above
 6 53bf0b54 2023-02-23 op  * copyright notice and this permission notice appear in all copies.
 7 53bf0b54 2023-02-23 op  *
 8 53bf0b54 2023-02-23 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 53bf0b54 2023-02-23 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 53bf0b54 2023-02-23 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 53bf0b54 2023-02-23 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 53bf0b54 2023-02-23 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 53bf0b54 2023-02-23 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 53bf0b54 2023-02-23 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 53bf0b54 2023-02-23 op  */
16 53bf0b54 2023-02-23 op 
17 53bf0b54 2023-02-23 op #define GOT_SHA1_STRING_ZERO "0000000000000000000000000000000000000000"
18 87a3ab84 2023-02-23 op #define GOT_SHA256_STRING_ZERO "0000000000000000000000000000000000000000000000000000000000000000"
19 53bf0b54 2023-02-23 op 
20 ae25a666 2023-02-23 op #define GOT_HASH_DIGEST_MAXLEN SHA256_DIGEST_LENGTH
21 ae25a666 2023-02-23 op 
22 53bf0b54 2023-02-23 op int got_parse_xdigit(uint8_t *, const char *);
23 87a3ab84 2023-02-23 op 
24 53bf0b54 2023-02-23 op char *got_sha1_digest_to_str(const uint8_t *, char *, size_t);
25 87a3ab84 2023-02-23 op char *got_sha256_digest_to_str(const uint8_t *, char *, size_t);
26 87a3ab84 2023-02-23 op 
27 87a3ab84 2023-02-23 op int got_parse_hash_digest(uint8_t *, const char *, enum got_hash_algorithm);
28 87a3ab84 2023-02-23 op int got_parse_object_id(struct got_object_id *, const char *,
29 87a3ab84 2023-02-23 op     enum got_hash_algorithm);
30 ae25a666 2023-02-23 op 
31 ae25a666 2023-02-23 op struct got_hash {
32 ae25a666 2023-02-23 op 	SHA1_CTX		 sha1_ctx;
33 ae25a666 2023-02-23 op 	SHA2_CTX		 sha256_ctx;
34 ae25a666 2023-02-23 op 	enum got_hash_algorithm	 algo;
35 ae25a666 2023-02-23 op };
36 ae25a666 2023-02-23 op 
37 ae25a666 2023-02-23 op /*
38 ae25a666 2023-02-23 op  * These functions allow to compute and check hashes.
39 ae25a666 2023-02-23 op  * The hash function used is specified during got_hash_init.
40 ae25a666 2023-02-23 op  * Data can be added with got_hash_update and, once done, the checksum
41 ae25a666 2023-02-23 op  * saved in a buffer long at least GOT_HASH_DIGEST_MAXLEN bytes with
42 ae25a666 2023-02-23 op  * got_hash_final or in an got_object_id with got_hash_final_object_id.
43 ae25a666 2023-02-23 op  */
44 ae25a666 2023-02-23 op void	got_hash_init(struct got_hash *, enum got_hash_algorithm);
45 ae25a666 2023-02-23 op void	got_hash_update(struct got_hash *, const void *, size_t);
46 ae25a666 2023-02-23 op void	got_hash_final(struct got_hash *, uint8_t *);
47 ae25a666 2023-02-23 op void	got_hash_final_object_id(struct got_hash *, struct got_object_id *);
48 ae25a666 2023-02-23 op 
49 ae25a666 2023-02-23 op /*
50 ae25a666 2023-02-23 op  * Compare two hash digest; similar to memcmp().
51 ae25a666 2023-02-23 op  */
52 ae25a666 2023-02-23 op int	got_hash_cmp(enum got_hash_algorithm, uint8_t *, uint8_t *);