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/* $OpenBSD: gmp_util.c,v 1.11 2004/04/15 18:39:25 deraadt Exp $ */
/* $EOM: gmp_util.c,v 1.7 2000/09/18 00:01:47 ho Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
* Copyright (c) 1999, 2000 Niklas Hallqvist. All rights reserved.
* Copyright (c) 2000 Håkan Olsson. 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.
*
* 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 "sysdep.h"
#include "gmp_util.h"
#include "math_mp.h"
/* Various utility functions for gmp, used in more than one module */
u_int32_t
mpz_sizeinoctets(math_mp_t a)
{
#if MP_FLAVOUR == MP_FLAVOUR_GMP
return (7 + mpz_sizeinbase(a, 2)) >> 3;
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
return BN_num_bytes(a);
#endif
}
void
mpz_getraw(u_int8_t *raw, math_mp_t v, u_int32_t len)
{
math_mp_t a;
#if MP_FLAVOUR == MP_FLAVOUR_GMP
math_mp_t tmp;
/* XXX mpz_get_str (raw, BASE, v); ? */
mpz_init_set(a, v);
mpz_init(tmp);
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
/* XXX bn2bin? */
a = BN_dup(v);
#endif
while (len-- > 0)
#if MP_FLAVOUR == MP_FLAVOUR_GMP
raw[len] = mpz_fdiv_qr_ui(a, tmp, a, 256);
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
raw[len] = BN_div_word(a, 256);
#endif
#if MP_FLAVOUR == MP_FLAVOUR_GMP
mpz_clear(a);
mpz_clear(tmp);
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
BN_clear_free(a);
#endif
}
void
mpz_setraw(math_mp_t d, u_int8_t *s, u_int32_t l)
{
u_int32_t i;
#if MP_FLAVOUR == MP_FLAVOUR_GMP
/* XXX mpz_set_str (d, s, 0); */
mpz_set_si(d, 0);
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
/* XXX bin2bn? */
BN_set_word(d, 0);
#endif
for (i = 0; i < l; i++) {
#if MP_FLAVOUR == MP_FLAVOUR_GMP
mpz_mul_ui(d, d, 256);
mpz_add_ui(d, d, s[i]);
#elif MP_FLAVOUR == MP_FLAVOUR_OPENSSL
BN_mul_word(d, 256);
BN_add_word(d, s[i]);
#endif
}
}
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