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/* $OpenBSD: gmp_util.c,v 1.4 1999/02/26 03:40:05 niklas Exp $ */
/* $EOM: gmp_util.c,v 1.2 1999/02/25 11:38:58 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/param.h>
#include <gmp.h>
#include "sysdep.h"
#include "gmp_util.h"
/* Various utility functions for gmp, used in more than one module */
u_int32_t
mpz_sizeinoctets (mpz_ptr a)
{
return (7 + mpz_sizeinbase (a, 2)) >> 3;
}
void
mpz_getraw (u_int8_t *raw, mpz_ptr v, u_int32_t len)
{
mpz_t a, tmp;
mpz_init_set (a, v);
mpz_init (tmp);
while (len-- > 0)
raw[len] = mpz_fdiv_qr_ui (a, tmp, a, 256);
mpz_clear (a);
mpz_clear (tmp);
}
void
mpz_setraw (mpz_ptr d, u_int8_t *s, u_int32_t l)
{
u_int32_t i;
mpz_set_ui (d, 0);
for (i = 0; i < l; i++)
{
mpz_mul_ui (d, d, 256);
mpz_add_ui (d, d, s[i]);
}
}
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