1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define GOT_SHA1_STRING_ZERO "0000000000000000000000000000000000000000"
18 #define GOT_SHA256_STRING_ZERO "0000000000000000000000000000000000000000000000000000000000000000"
19 
20 int got_parse_xdigit(uint8_t *, const char *);
21 
22 int got_parse_sha1_digest(uint8_t *, const char *);
23 char *got_sha1_digest_to_str(const uint8_t *, char *, size_t);
24 
25 int got_parse_sha256_digest(uint8_t *, const char *);
26 char *got_sha256_digest_to_str(const uint8_t *, char *, size_t);
27 
28 int got_parse_hash_digest(uint8_t *, const char *, enum got_hash_algorithm);
29 char *got_hash_digest_to_str(const uint8_t *, char *, size_t,
30     enum got_hash_algorithm);
31 
32 size_t got_hash_digest_length(enum got_hash_algorithm);
33 size_t got_hash_digest_string_length(enum got_hash_algorithm);
34 
35 struct got_hash {
36 	SHA1_CTX		 sha1_ctx;
37 	SHA2_CTX		 sha256_ctx;
38 	enum got_hash_algorithm	 algo;
39 };
40 
41 /*
42  * These functions allow to compute and check hashes.
43  * The hash function used is specified during got_hash_init.
44  * Data can be added with got_hash_update and, once done, the checksum
45  * can be obtained with got_hash_final; its output buffer must be at
46  * least GOT_OBJECT_ID_MAXLEN bytes.
47  * got_hash_cmp is like memcmp() and compares two hash digests.
48  */
49 void	got_hash_init(struct got_hash *, enum got_hash_algorithm);
50 void	got_hash_update(struct got_hash *, const void *, size_t);
51 void	got_hash_final(struct got_hash *, uint8_t *);
52 int	got_hash_cmp(struct got_hash *, uint8_t *, uint8_t *);