mirror of
https://git.libssh.org/projects/libssh.git
synced 2026-02-06 10:27:22 +09:00
0cda1c0e83
Signed-off-by: Jakub Jelen <jjelen@redhat.com> Reviewed-by: Andreas Schneider <asn@cryptomilk.org> Reviewed-by: Sahana Prasad <sahana@redhat.com>
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
|
|
* This file is part of the SSH Library
|
|
*
|
|
* Copyright (c) 2014 by Aris Adamantiadis <aris@badcode.be>
|
|
*
|
|
* 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 <stdio.h>
|
|
|
|
#include "libssh/priv.h"
|
|
#include "libssh/bignum.h"
|
|
#include "libssh/string.h"
|
|
|
|
static ssh_string make_bignum_string(bignum num, size_t pad_to_len)
|
|
{
|
|
ssh_string ptr = NULL;
|
|
size_t pad = 0;
|
|
size_t len = bignum_num_bytes(num);
|
|
size_t bits = bignum_num_bits(num);
|
|
|
|
if (pad_to_len == 0) {
|
|
/* If the first bit is set we have a negative number */
|
|
if (!(bits % 8) && bignum_is_bit_set(num, bits - 1)) {
|
|
pad++;
|
|
}
|
|
} else {
|
|
if (len > pad_to_len) {
|
|
return NULL;
|
|
}
|
|
pad = pad_to_len - len;
|
|
}
|
|
|
|
#ifdef DEBUG_CRYPTO
|
|
SSH_LOG(SSH_LOG_TRACE, "%zu bits, %zu bytes, %zu padding", bits, len, pad);
|
|
#endif /* DEBUG_CRYPTO */
|
|
|
|
ptr = ssh_string_new(len + pad);
|
|
if (ptr == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
/* We have a negative number so we need a leading zero */
|
|
if (pad) {
|
|
memset(ptr->data, 0, pad);
|
|
}
|
|
|
|
bignum_bn2bin(num, len, ptr->data + pad);
|
|
|
|
return ptr;
|
|
}
|
|
|
|
ssh_string ssh_make_bignum_string(bignum num)
|
|
{
|
|
return make_bignum_string(num, 0);
|
|
}
|
|
|
|
ssh_string ssh_make_padded_bignum_string(bignum num, size_t pad_len)
|
|
{
|
|
return make_bignum_string(num, pad_len);
|
|
}
|
|
|
|
bignum ssh_make_string_bn(ssh_string string)
|
|
{
|
|
bignum bn = NULL;
|
|
size_t len = ssh_string_len(string);
|
|
|
|
#ifdef DEBUG_CRYPTO
|
|
SSH_LOG(SSH_LOG_TRACE,
|
|
"Importing a %zu bits, %zu bytes object ...",
|
|
len * 8,
|
|
len);
|
|
#endif /* DEBUG_CRYPTO */
|
|
|
|
bignum_bin2bn(string->data, (int)len, &bn);
|
|
|
|
return bn;
|
|
}
|
|
|
|
/* prints the bignum on stderr */
|
|
void ssh_print_bignum(const char *name, const_bignum num)
|
|
{
|
|
unsigned char *hex = NULL;
|
|
if (num != NULL) {
|
|
bignum_bn2hex(num, &hex);
|
|
}
|
|
SSH_LOG(SSH_LOG_DEBUG,
|
|
"%s value: %s",
|
|
name,
|
|
(hex == NULL) ? "(null)" : (char *)hex);
|
|
ssh_crypto_free(hex);
|
|
}
|