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/*
* This file is part of the SSH Library
*
* Copyright (c) 2017 Sartura d.o.o.
*
* Author: Juraj Vijtiuk <juraj.vijtiuk@sartura.hr>
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include "config.h"
#include "libssh/priv.h"
#include "libssh/libmbedcrypto.h"
#ifdef HAVE_LIBMBEDCRYPTO
bignum ssh_mbedcry_bn_new(void)
{
bignum bn;
bn = malloc(sizeof(mbedtls_mpi));
if (bn) {
mbedtls_mpi_init(bn);
}
return bn;
}
void ssh_mbedcry_bn_free(bignum bn)
{
mbedtls_mpi_free(bn);
SAFE_FREE(bn);
}
char *ssh_mbedcry_bn2num(bignum num, int radix)
{
char *buf = NULL;
size_t olen;
int rc;
rc = mbedtls_mpi_write_string(num, radix, buf, 0, &olen);
if (rc != 0) {
return NULL;
}
buf = malloc(olen);
if (buf == NULL) {
return NULL;
}
rc = mbedtls_mpi_write_string(num, radix, buf, olen, &olen);
if (rc != 0) {
SAFE_FREE(buf);
return NULL;
}
return buf;
}
int ssh_mbedcry_rand(bignum rnd, int bits, int top, int bottom)
{
size_t len;
int rc;
int i;
if (bits <= 0) {
return 0;
}
len = bits / 8 + 1;
rc = mbedtls_mpi_fill_random(rnd, len, mbedtls_ctr_drbg_random,
&ssh_mbedtls_ctr_drbg);
if (rc != 0) {
return 0;
}
for (i = len * 8 - 1; i >= bits; i--) {
rc = mbedtls_mpi_set_bit(rnd, i, 0);
if (rc != 0) {
return 0;
}
}
if (top == 0) {
rc = mbedtls_mpi_set_bit(rnd, bits - 1, 0);
}
if (top == 1) {
if (bits < 2) {
return 0;
}
rc = mbedtls_mpi_set_bit(rnd, bits - 2, 0);
if (rc != 0) {
return 0;
}
}
if (bottom) {
rc = mbedtls_mpi_set_bit(rnd, 0, 1);
if (rc != 0) {
return 0;
}
}
return 1;
}
int ssh_mbedcry_is_bit_set(bignum num, size_t pos)
{
int bit;
bit = mbedtls_mpi_get_bit(num, pos);
return bit;
}
#endif
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