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/*
* Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define GOT_SHA1_STRING_ZERO "0000000000000000000000000000000000000000"
#define GOT_SHA256_STRING_ZERO "0000000000000000000000000000000000000000000000000000000000000000"
#define GOT_HASH_DIGEST_MAXLEN SHA256_DIGEST_LENGTH
#define GOT_HASH_DIGEST_STRING_MAXLEN SHA256_DIGEST_STRING_LENGTH
int got_parse_xdigit(uint8_t *, const char *);
char *got_sha1_digest_to_str(const uint8_t *, char *, size_t);
char *got_sha256_digest_to_str(const uint8_t *, char *, size_t);
char *got_hash_digest_to_str(const uint8_t *, char *, size_t,
enum got_hash_algorithm);
int got_parse_hash_digest(uint8_t *, const char *, enum got_hash_algorithm);
/*
* Write the string representation fo an object ID in the given buffer.
* This buffer must be at least GOT_OBJECT_ID_HEX_MAXLEN bytes in size.
* The output depends on the hash function used by the repository format.
*/
char *got_object_id_hex(struct got_object_id *, char *, size_t);
int got_parse_object_id(struct got_object_id *, const char *,
enum got_hash_algorithm);
static inline int
got_hash_digest_length(enum got_hash_algorithm algo)
{
switch (algo) {
case GOT_HASH_SHA1:
return SHA1_DIGEST_LENGTH;
case GOT_HASH_SHA256:
return SHA256_DIGEST_LENGTH;
default:
return 0;
}
}
static inline int
got_hash_digest_string_length(enum got_hash_algorithm algo)
{
switch (algo) {
case GOT_HASH_SHA1:
return SHA1_DIGEST_STRING_LENGTH;
case GOT_HASH_SHA256:
return SHA256_DIGEST_STRING_LENGTH;
default:
return 0;
}
}
struct got_hash {
SHA1_CTX sha1_ctx;
SHA2_CTX sha256_ctx;
enum got_hash_algorithm algo;
};
/*
* These functions allow to compute and check hashes.
* The hash function used is specified during got_hash_init.
* Data can be added with got_hash_update and, once done, the checksum
* saved in a buffer long at least GOT_HASH_DIGEST_MAXLEN bytes with
* got_hash_final or in an got_object_id with got_hash_final_object_id.
*/
void got_hash_init(struct got_hash *, enum got_hash_algorithm);
void got_hash_update(struct got_hash *, const void *, size_t);
void got_hash_final(struct got_hash *, uint8_t *);
void got_hash_final_object_id(struct got_hash *, struct got_object_id *);
/*
* Compare two hash digest; similar to memcmp().
*/
int got_hash_cmp(enum got_hash_algorithm, uint8_t *, uint8_t *);
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