view bignum.c @ 1902:4a6725ac957c

Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 1051e4eea25a
children 8b4274d34fe8
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/*
 * Dropbear - a SSH2 server
 * 
 * Copyright (c) 2002,2003 Matt Johnston
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. */

/* Contains helper functions for mp_int handling */

#include "includes.h"
#include "dbutil.h"

/* wrapper for mp_init, failing fatally on errors (memory allocation) */
void m_mp_init(mp_int *mp) {

	if (mp_init(mp) != MP_OKAY) {
		dropbear_exit("Mem alloc error");
	}
}

/* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally
 * on error */
void m_mp_init_multi(mp_int *mp, ...) 
{
	mp_int* cur_arg = mp;
	va_list args;

	va_start(args, mp);        /* init args to next argument from caller */
	while (cur_arg != NULL) {
		if (mp_init(cur_arg) != MP_OKAY) {
			dropbear_exit("Mem alloc error");
		}
		cur_arg = va_arg(args, mp_int*);
	}
	va_end(args);
}

void m_mp_alloc_init_multi(mp_int **mp, ...) 
{
	mp_int** cur_arg = mp;
	va_list args;

	va_start(args, mp);        /* init args to next argument from caller */
	while (cur_arg != NULL) {
		*cur_arg = m_malloc(sizeof(mp_int));
		if (mp_init(*cur_arg) != MP_OKAY) {
			dropbear_exit("Mem alloc error");
		}
		cur_arg = va_arg(args, mp_int**);
	}
	va_end(args);
}

void m_mp_free_multi(mp_int **mp, ...) 
{
	mp_int** cur_arg = mp;
	va_list args;

	va_start(args, mp);        /* init args to next argument from caller */
	while (cur_arg != NULL) {
		if (*cur_arg) {
			mp_clear(*cur_arg);
		}
		m_free(*cur_arg);
		cur_arg = va_arg(args, mp_int**);
	}
	va_end(args);
}

void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) {

	if (mp_from_ubin(mp, (unsigned char*)bytes, len) != MP_OKAY) {
		dropbear_exit("Mem alloc error");
	}
}

/* hash the ssh representation of the mp_int mp */
void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, 
				hash_state *hs, mp_int *mp) {
	buffer * buf;

	buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, 
								plus header + some leeway*/
	buf_putmpint(buf, mp);
	hash_desc->process(hs, buf->data, buf->len);
	buf_free(buf);
}