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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
size_t
librecrypt_settings_prefix(const char *hash, size_t *hashsize_out)
{
size_t i, len, ret = 0u;
size_t last_offset = 0u;
const struct algorithm *algo;
uintmax_t hashsize;
/* Find last algorithm, and beginning of result */
for (i = 0u; hash[i]; i++) {
if (hash[i] == LIBRECRYPT_HASH_COMPOSITION_DELIMITER)
ret = i + 1u;
else if (hash[i] == LIBRECRYPT_ALGORITHM_LINK_DELIMITER)
last_offset = ret = i + 1u;
}
/* and get `strlen(hash)` */
len = i;
/* TODO "_" is a prefix that is being used */
/* Return if hash size is not required */
if (!hashsize_out)
goto out;
/* Return 0 as hash size if default is specified */
if (ret == i)
goto zero;
/* Return 0 as hash size if algorithm cannot be identified or has fixed hash size */
algo = librecrypt_find_first_algorithm_(&hash[last_offset], len - last_offset);
if (!algo || !algo->flexible_hash_size)
goto zero;
/* Get the hash size */
if (!librecrypt_check_settings_(&hash[ret], len - ret, "%^b",
&hashsize, (uintmax_t)1u, (uintmax_t)SIZE_MAX,
algo->decoding_lut, algo->pad, algo->strict_pad))
goto zero;
*hashsize_out = (size_t)hashsize;
goto out;
zero:
*hashsize_out = 0u;
out:
return ret;
}
#else
#define CHECK_NULL(PREFIX, SUFFIX)\
do {\
EXPECT(librecrypt_settings_prefix(PREFIX SUFFIX, NULL) == sizeof(PREFIX) - 1u);\
EXPECT(librecrypt_settings_prefix(PREFIX, NULL) == sizeof(PREFIX) - 1u); \
} while (0)
#if 0
#define CHECK_ASTERISK(PREFIX, SUFFIX, HASH)\
do {\
size_t hashsize = 99999u;\
EXPECT(librecrypt_settings_prefix(PREFIX SUFFIX #HASH, &hashsize) == sizeof(PREFIX) - 1u);\
EXPECT(hashsize == HASH##u);\
} while (0)
#define CHECK_ZERO(PREFIX, SUFFIX)\
do {\
size_t hashsize = 99999u;\
EXPECT(librecrypt_settings_prefix(PREFIX SUFFIX, &hashsize) == sizeof(PREFIX) - 1u);\
EXPECT(hashsize == 0u);\
} while (0)
#define CHECK_HASHED(PREFIX, SUFFIX, HASH)\
do {\
size_t hashsize = 99999u;\
EXPECT(librecrypt_settings_prefix(PREFIX SUFFIX, &hashsize) == sizeof(PREFIX) - 1u);\
EXPECT(hashsize == HASH##u);\
} while (0)
#endif
int
main(void)
{
SET_UP_ALARM();
/* Simple cases */
CHECK_NULL("", "result");
CHECK_NULL(">", "double-des result");
CHECK_NULL("$", "x");
CHECK_NULL("y$", "x");
CHECK_NULL("y>", "x");
CHECK_NULL("a$b$c>d$e$", "x");
CHECK_NULL("a$b$c>", "x");
/* Discard asterisk-notation */
CHECK_NULL("", "*10");
CHECK_NULL(">", "*11");
CHECK_NULL("$", "*12");
CHECK_NULL("y$", "*13");
CHECK_NULL("y>", "*012");
CHECK_NULL("a$b$c>d$e$", "*1");
CHECK_NULL("a$b$c>", "*2");
CHECK_NULL("a$b$c>*10$", "*2");
/* TODO test hash size output (requires algorithms) */
return 0;
}
#endif
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