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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
static ssize_t
zero_generator(void *out, size_t n, void *user)
{
(void) user;
if (n > (size_t)SSIZE_MAX)
n = (size_t)SSIZE_MAX;
memset(out, 0, n);
return (ssize_t)n;
}
ssize_t
librecrypt_hash_(char *restrict out_buffer, size_t size, const char *phrase, size_t len,
const char *settings, void *reserved, enum action action)
{
const struct algorithm *algo;
ssize_t (*rng)(void *out, size_t n, void *user) = NULL;
char *settings_scratch = NULL;
char *phrase_scratches[2] = {NULL, NULL};
size_t phrase_scratch_sizes[2] = {0u, 0u};
size_t n, ascii_len, min, prefix, ret = 0u;
int has_next, phrase_scratch_i = 0;
ssize_t r_len;
int r;
void *new;
if (reserved != NULL) {
errno = EINVAL;
return -1;
}
if (!size)
rng = &zero_generator;
if (strchr(settings, '*')) {
if (action != ASCII_CRYPT) {
errno = EINVAL;
return -1;
}
r_len = librecrypt_realise_salts(out_buffer, size, settings, rng, NULL);
if (r_len < 0) {
if (errno == ERANGE)
errno = ENOMEM;
return -1;
} else if ((size_t)r_len >= size) {
settings_scratch = malloc((size_t)r_len + 1u);
if (!settings_scratch)
return -1;
if (librecrypt_realise_salts(settings_scratch, (size_t)r_len + 1u, settings, rng, NULL) != r_len)
abort();
settings = settings_scratch;
}
}
next:
has_next = 0;
for (n = 0u; settings[n]; n++) {
if (settings[n] == LIBRECRYPT_ALGORITHM_LINK_DELIMITER) {
has_next = 1;
break;
}
}
algo = librecrypt_find_first_algorithm_(settings, n);
if (!algo) {
errno = ENOSYS;
goto fail;
}
prefix = (*algo->get_prefix)(settings, n);
if (has_next && prefix < n) {
errno = EINVAL;
goto fail;
}
if (action == ASCII_CRYPT) {
min = size ? size - 1u < prefix ? size - 1u : prefix : 0u;
size -= min;
memcpy(out_buffer, settings, min);
out_buffer = &out_buffer[min];
ret += prefix;
}
if (size && phrase_scratch_sizes[phrase_scratch_i] < algo->hash_size) {
librecrypt_wipe(phrase_scratches[phrase_scratch_i], phrase_scratch_sizes[phrase_scratch_i]);
new = realloc(phrase_scratches[phrase_scratch_i], algo->hash_size);
if (!new) {
free(phrase_scratches[phrase_scratch_i]);
phrase_scratches[phrase_scratch_i] = NULL;
phrase_scratch_sizes[phrase_scratch_i] = 0u;
goto fail;
}
phrase_scratches[phrase_scratch_i] = new;
phrase_scratch_sizes[phrase_scratch_i] = algo->hash_size;
}
if (has_next) {
hash_to_scratch:
r = (*algo->hash)(size ? phrase_scratches[phrase_scratch_i] : NULL,
size ? phrase_scratch_sizes[phrase_scratch_i] : 0u,
phrase, len, settings, prefix, reserved);
} else if (action == BINARY_HASH) {
hash_to_output:
r = (*algo->hash)(out_buffer, size, phrase, len, settings, prefix, reserved);
} else if (size < algo->hash_size) {
goto hash_to_scratch;
} else {
goto hash_to_output;
}
if (r < 0)
goto fail;
if (!has_next) {
if (action == BINARY_HASH) {
ret += algo->hash_size;
} else if (!size) {
ascii_len = algo->hash_size % 3u;
if (ascii_len) {
if (algo->pad && algo->strict_pad)
ascii_len = 4u;
else
ascii_len += 1u;
}
ascii_len += algo->hash_size / 3u * 4u;
goto include_ascii;
} else {
ascii_len = librecrypt_encode(out_buffer, size,
size < algo->hash_size ? phrase_scratches[phrase_scratch_i] : out_buffer,
algo->hash_size, algo->encoding_lut, algo->strict_pad ? algo->pad : '\0');
include_ascii:
min = size ? size - 1u < ascii_len ? size - 1u : ascii_len : 0u;
out_buffer = &out_buffer[min];
size -= min;
ret += ascii_len;
}
} else {
phrase = size ? phrase_scratches[phrase_scratch_i] : NULL;
phrase_scratch_i ^= 1;
len = algo->hash_size;
settings = &settings[n];
if (action == ASCII_CRYPT) {
ret += 1u;
if (size) {
*out_buffer++ = LIBRECRYPT_ALGORITHM_LINK_DELIMITER;
size -= 1u;
}
}
settings++;
goto next;
}
librecrypt_wipe(phrase_scratches[0u], phrase_scratch_sizes[0u]);
librecrypt_wipe(phrase_scratches[1u], phrase_scratch_sizes[1u]);
librecrypt_wipe_str(settings_scratch);
free(phrase_scratches[0u]);
free(phrase_scratches[1u]);
free(settings_scratch);
if (size && action != BINARY_HASH)
out_buffer[0] = '\0';
return (ssize_t)ret;
fail:
librecrypt_wipe(phrase_scratches[0u], phrase_scratch_sizes[0u]);
librecrypt_wipe(phrase_scratches[1u], phrase_scratch_sizes[1u]);
librecrypt_wipe_str(settings_scratch);
free(phrase_scratches[0u]);
free(phrase_scratches[1u]);
free(settings_scratch);
return -1;
}
#else
/* Tested via librecrypt_hash_binary, librecrypt_hash, and librecrypt_crypt */
CONST int main(void) { return 0; }
#endif
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