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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
ssize_t
librecrypt_realise_salts(char *restrict out_buffer, size_t size, const char *settings,
ssize_t (*rng)(void *out, size_t n, void *user), void *user)
{
const char *lut;
char pad;
int strict_pad, has_asterisk, nul_term = 0;
size_t i, j, n, min, ret = 0u;
size_t count, digit, q, r, left, mid, right;
if (size) {
nul_term = 1;
size -= 1u;
}
for (;;) {
for (; *settings == LIBRECRYPT_ALGORITHM_LINK_DELIMITER; settings++) {
if (size) {
*out_buffer++ = LIBRECRYPT_ALGORITHM_LINK_DELIMITER;
size -= 1u;
}
ret += 1u;
}
if (!*settings)
break;
has_asterisk = 0;
for (n = 0u; settings[n] && settings[n] != LIBRECRYPT_ALGORITHM_LINK_DELIMITER; n++)
if (settings[n] == '*')
has_asterisk = 1;
if (!has_asterisk) {
min = size < n ? size : n;
memcpy(out_buffer, settings, min);
out_buffer += min;
settings = &settings[n];
ret += n;
continue;
}
if (*settings == '*') {
errno = EINVAL;
return -1;
}
lut = librecrypt_get_encoding(settings, n, &pad, &strict_pad, 0);
if (!lut)
return -1;
pad = strict_pad ? pad : '\0';
for (i = 0; i < n;) {
if (settings[i] != '*') {
if (size) {
*out_buffer++ = settings[i];
size -= 1u;
}
ret += 1u;
i++;
continue;
}
if (++i == n) {
if (size) {
*out_buffer++ = '*';
size -= 1u;
}
ret += 1u;
break;
}
if ('0' > settings[i] || settings[i] > '9') {
if (size) {
*out_buffer++ = '*';
size -= 1u;
}
ret += 1u;
continue;
}
count = 0;
for (; i < n && '0' <= settings[i] && settings[i] <= '9'; i++) {
digit = (size_t)(settings[i] - '0');
if (count > ((size_t)SSIZE_MAX - digit) / 10u)
goto erange;
count *= 10u;
count += digit;
}
q = count / 3u;
r = count % 3u;
mid = r ? r + 1u : 0u;
right = (!r ? 0u : pad ? 4u : r + 1u);
if (q > ((size_t)SSIZE_MAX - right) / 4u)
goto erange;
left = q * 4u;
ret += left + mid + right;
left += mid;
if (left > size) {
left = size;
mid = 0;
}
if (librecrypt_fill_with_random_(out_buffer, left, rng, user))
return -1;
for (j = 0; j < left; j++)
out_buffer[j] = lut[((unsigned char *)out_buffer)[j]];
if (mid)
out_buffer[j] = lut[((unsigned char *)out_buffer)[j] & (r == 1u ? ~15u : ~3u)];
out_buffer = &out_buffer[left];
size -= left;
if (right > size)
right = size;
for (j = 0; j < right; j++)
out_buffer[right] = pad;
out_buffer = &out_buffer[right];
size -= right;
}
}
if (nul_term)
*out_buffer = '\0';
if (ret > (size_t)SSIZE_MAX)
goto erange;
return (ssize_t)ret;
erange:
errno = ERANGE;
return -1;
}
#else
int
main(void)
{
SET_UP_ALARM();
return 0;
}
#endif
/* TODO test */
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