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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include "libdnssec/binary.h"
#include "libdnssec/error.h"
#include "contrib/ctype.h"
/* -- binary to hex -------------------------------------------------------- */
static const char BIN_TO_HEX[] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
int bin_to_hex_static(const dnssec_binary_t *bin, dnssec_binary_t *hex)
{
if (!bin || !hex) {
return DNSSEC_EINVAL;
}
if (bin->size * 2 != hex->size) {
return DNSSEC_EINVAL;
}
for (size_t i = 0; i < bin->size; i++) {
hex->data[2*i] = BIN_TO_HEX[bin->data[i] >> 4];
hex->data[2*i+1] = BIN_TO_HEX[bin->data[i] & 0x0f];
}
return DNSSEC_EOK;
}
int bin_to_hex(const dnssec_binary_t *bin, char **hex_ptr)
{
if (!bin || !hex_ptr) {
return DNSSEC_EINVAL;
}
size_t hex_size = bin->size * 2;
char *hex = malloc(hex_size + 1);
if (!hex) {
return DNSSEC_ENOMEM;
}
dnssec_binary_t hex_bin = { .data = (uint8_t *)hex, .size = hex_size };
bin_to_hex_static(bin, &hex_bin);
hex[hex_size] = '\0';
*hex_ptr = hex;
return DNSSEC_EOK;
}
/* -- hex to binary -------------------------------------------------------- */
/*!
* Convert HEX character to numeric value (assumes valid and lowercase input).
*/
static uint8_t hex_to_number(const char hex)
{
if (hex >= '0' && hex <= '9') {
return hex - '0';
} else if (hex >= 'a' && hex <= 'f') {
return hex - 'a' + 10;
} else {
assert(hex >= 'A' && hex <= 'F');
return hex - 'A' + 10;
}
}
/*!
* Check if the input string has valid size and contains valid characters.
*/
static bool hex_valid_input(const dnssec_binary_t *hex)
{
assert(hex);
if (hex->size % 2 != 0) {
return false;
}
for (int i = 0; i < hex->size; i++) {
if (!is_xdigit(hex->data[i])) {
return false;
}
}
return true;
}
/*!
* Perform hex to bin conversion without checking the validity.
*/
static void hex_to_bin_convert(const dnssec_binary_t *hex, dnssec_binary_t *bin)
{
assert(hex);
assert(bin);
for (size_t i = 0; i < bin->size; i++) {
uint8_t high = hex_to_number(hex->data[2 * i]);
uint8_t low = hex_to_number(hex->data[2 * i + 1]);
bin->data[i] = high << 4 | low;
}
}
int hex_to_bin_static(const dnssec_binary_t *hex, dnssec_binary_t *bin)
{
if (!hex || !bin) {
return DNSSEC_EINVAL;
}
if (hex->size / 2 != bin->size) {
return DNSSEC_EINVAL;
}
if (!hex_valid_input(hex)) {
return DNSSEC_MALFORMED_DATA;
}
hex_to_bin_convert(hex, bin);
return DNSSEC_EOK;
}
int hex_to_bin(const char *hex_str, dnssec_binary_t *bin)
{
if (!hex_str || !bin) {
return DNSSEC_EINVAL;
}
dnssec_binary_t hex = { .data = (uint8_t *)hex_str, .size = strlen(hex_str) };
if (!hex_valid_input(&hex)) {
return DNSSEC_MALFORMED_DATA;
}
size_t bin_size = hex.size / 2;
if (bin_size == 0) {
bin->size = 0;
bin->data = NULL;
return DNSSEC_EOK;
}
int result = dnssec_binary_alloc(bin, bin_size);
if (result != DNSSEC_EOK) {
return result;
}
hex_to_bin_static(&hex, bin);
return DNSSEC_EOK;
}
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