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https://git.libssh.org/projects/libssh.git
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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
/*
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* This file is part of the SSH Library
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*
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* Copyright (c) 2014 by Aris Adamantiadis <aris@badcode.be>
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*
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* The SSH Library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The SSH Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the SSH Library; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include "libssh/priv.h"
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#include "libssh/bignum.h"
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#include "libssh/string.h"
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static ssh_string make_bignum_string(bignum num, size_t pad_to_len)
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{
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ssh_string ptr = NULL;
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size_t pad = 0;
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size_t len = bignum_num_bytes(num);
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size_t bits = bignum_num_bits(num);
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if (pad_to_len == 0) {
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/* If the first bit is set we have a negative number */
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if (!(bits % 8) && bignum_is_bit_set(num, bits - 1)) {
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pad++;
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}
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} else {
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if (len > pad_to_len) {
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return NULL;
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}
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pad = pad_to_len - len;
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}
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#ifdef DEBUG_CRYPTO
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SSH_LOG(SSH_LOG_TRACE, "%zu bits, %zu bytes, %zu padding", bits, len, pad);
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#endif /* DEBUG_CRYPTO */
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ptr = ssh_string_new(len + pad);
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if (ptr == NULL) {
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return NULL;
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}
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/* We have a negative number so we need a leading zero */
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if (pad) {
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memset(ptr->data, 0, pad);
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}
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bignum_bn2bin(num, len, ptr->data + pad);
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return ptr;
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}
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ssh_string ssh_make_bignum_string(bignum num)
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{
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return make_bignum_string(num, 0);
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}
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ssh_string ssh_make_padded_bignum_string(bignum num, size_t pad_len)
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{
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return make_bignum_string(num, pad_len);
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}
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bignum ssh_make_string_bn(ssh_string string)
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{
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bignum bn = NULL;
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size_t len = ssh_string_len(string);
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#ifdef DEBUG_CRYPTO
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SSH_LOG(SSH_LOG_TRACE,
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"Importing a %zu bits, %zu bytes object ...",
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len * 8,
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len);
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#endif /* DEBUG_CRYPTO */
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bignum_bin2bn(string->data, (int)len, &bn);
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return bn;
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}
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/* prints the bignum on stderr */
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void ssh_print_bignum(const char *name, const_bignum num)
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{
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unsigned char *hex = NULL;
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if (num != NULL) {
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bignum_bn2hex(num, &hex);
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}
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SSH_LOG(SSH_LOG_DEBUG,
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"%s value: %s",
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name,
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(hex == NULL) ? "(null)" : (char *)hex);
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ssh_crypto_free(hex);
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}
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