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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
ssize_t
librecrypt_add_algorithm(char *out_buffer, size_t size, char *augend, const char *restrict augment, void *reserved)
{
size_t prefix1 = librecrypt_settings_prefix(augend);
size_t prefix2, min, ret, len, phraselen;
char *phrase, pad;
int strict_pad;
const unsigned char *lut;
ssize_t r;
#define COPY_PREFIX()\
do {\
size -= 1u;\
min = prefix1 < size ? prefix1 : size;\
if (out_buffer != augend)\
memmove(out_buffer, augend, min);\
out_buffer = &out_buffer[min];\
size -= min;\
if (size) {\
*out_buffer++ = LIBRECRYPT_ALGORITHM_LINK_DELIMITER;\
size -= 1u;\
}\
} while (0)
if (!augend[prefix1]) {
prefix2 = librecrypt_settings_prefix(augment);
ret = prefix1 + 1u + prefix2;
if (size) {
COPY_PREFIX();
min = prefix2 < size ? prefix2 : size;
memcpy(out_buffer, augment, min);
out_buffer[min] = '\0';
}
return (ssize_t)ret;
}
if (size <= prefix1 + 2u) {
phrase = NULL;
phraselen = 0u;
} else {
lut = librecrypt_get_encoding(augend, strlen(augend), &pad, &strict_pad, 1);
if (!lut)
return -1;
len = strlen(&augend[prefix1]);
r = librecrypt_decode(NULL, 0, &augend[prefix1], len, lut, pad, strict_pad);
if (r <= 0) {
if (!r)
abort();
return -1;
}
phraselen = (size_t)r;
phrase = malloc(phraselen);
if (!phrase)
return -1;
if (librecrypt_decode(phrase, phraselen, &augend[prefix1], len, lut, pad, strict_pad) != r)
abort();
}
COPY_PREFIX();
ret = prefix1 + 1u;
r = librecrypt_crypt(out_buffer, size + 1u, phrase, phraselen, augment, reserved);
if (r <= 0) {
librecrypt_wipe(phrase, phraselen);
free(phrase);
if (!r)
abort();
return -1;
}
ret += (size_t)r;
librecrypt_wipe(phrase, phraselen);
free(phrase);
return (ssize_t)ret;
}
#else
int
main(void)
{
SET_UP_ALARM();
return 0;
}
#endif
/* TODO test */
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