dropbear: gendss.c annotate

annotate gendss.c @ 640:76097ec1a29a dropbear-tfm

- Bring in original tomsfastmath patch against 0.52 from Peter Turczak in 2008

author	Matt Johnston <matt@ucc.asn.au>
date	Mon, 21 Nov 2011 19:19:57 +0800
parents	c9483550701b
children	2b1bb792cd4d

rev	line source
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * Permission is hereby granted, free of charge, to any person obtaining a copy
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * of this software and associated documentation files (the "Software"), to deal
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * in the Software without restriction, including without limitation the rights
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * copies of the Software, and to permit persons to whom the Software is
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * furnished to do so, subject to the following conditions:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * The above copyright notice and this permission notice shall be included in
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * SOFTWARE. */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "dbutil.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "signkey.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "bignum.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "random.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "gendss.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "dss.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #define QSIZE 20 /* 160 bit */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35
60 2ca590852f45 Just a test for merging heads Matt Johnston <matt@ucc.asn.au> parents: 48 diff changeset	36 /* This is just a test */
2ca590852f45 Just a test for merging heads Matt Johnston <matt@ucc.asn.au> parents: 48 diff changeset	37
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 #ifdef DROPBEAR_DSS
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 static void getq(dss_key *key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 static void getp(dss_key *key, unsigned int size);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 static void getg(dss_key *key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 static void getx(dss_key *key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 static void gety(dss_key *key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 dss_key * gen_dss_priv_key(unsigned int size) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 dss_key *key;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 key = (dss_key*)m_malloc(sizeof(dss_key));
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	52 key->p = (fp_int*)m_malloc(sizeof(fp_int));
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	53 key->q = (fp_int*)m_malloc(sizeof(fp_int));
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	54 key->g = (fp_int*)m_malloc(sizeof(fp_int));
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	55 key->y = (fp_int*)m_malloc(sizeof(fp_int));
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	56 key->x = (fp_int*)m_malloc(sizeof(fp_int));
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	57 m_fp_init_multi(key->p, key->q, key->g, key->y, key->x, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 seedrandom();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 getq(key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 getp(key, size);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 getg(key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 getx(key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 gety(key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 return key;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 static void getq(dss_key *key) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 char buf[QSIZE];
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 /* 160 bit prime */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 genrandom(buf, QSIZE);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 buf[0] \|= 0x80; /* top bit high */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 buf[QSIZE-1] \|= 0x01; /* bottom bit high */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	80 bytes_to_fp(key->q, buf, QSIZE);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 /* 18 rounds are required according to HAC */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	83 if (fp_prime_next_prime(key->q, 18, 0) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84 fprintf(stderr, "dss key generation failed\n");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 static void getp(dss_key *key, unsigned int size) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	91 DEF_FP_INT(tempX);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	92 DEF_FP_INT(tempC);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	93 DEF_FP_INT(tempP);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	94 DEF_FP_INT(temp2q);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 int result;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 unsigned char *buf;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	98 m_fp_init_multi(&tempX, &tempC, &tempP, &temp2q, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 /* 2q /
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	102 fp_mul_d(key->q, 2, &temp2q);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 buf = (unsigned char*)m_malloc(size);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 result = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 do {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 genrandom(buf, size);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 buf[0] \|= 0x80; /* set the top bit high */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	112 /* X is a random fp_int */
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	113 bytes_to_fp(&tempX, buf, size);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 /* C = X mod 2q */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	116 if (fp_mod(&tempX, &temp2q, &tempC) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 fprintf(stderr, "dss key generation failed\n");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 /* P = X - (C - 1) = X - C + 1*/
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	122 fp_sub(&tempX, &tempC, &tempP);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	124 fp_add_d(&tempP, 1, key->p);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 /* now check for prime, 5 rounds is enough according to HAC */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 /* result == 1 => p is prime */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	128 if (fp_prime_is_prime(key->p, 5, &result) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 fprintf(stderr, "dss key generation failed\n");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 } while (!result);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	134 fp_zero(&tempX);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	135 fp_zero(&tempC);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	136 fp_zero(&tempP);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	137 fp_zero(&temp2q);
188 c9483550701b - refactored random mp_int generation and byte->mp_int code Matt Johnston <matt@ucc.asn.au> parents: 102 diff changeset	138 m_burn(buf, size);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 m_free(buf);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 static void getg(dss_key * key) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	144 DEF_FP_INT(div);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	145 DEF_FP_INT(h);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	146 DEF_FP_INT(val);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	148 m_fp_init_multi(&div, &h, &val, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 /* get div=(p-1)/q */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	151 fp_sub_d(key->p, 1, &val);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	152 fp_div(&val, key->q, &div, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 /* initialise h=1 */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	155 fp_set(&h, 1);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 do {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 /* now keep going with g=h^div mod p, until g > 1 */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	158 if (fp_exptmod(&h, &div, key->p, key->g) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 fprintf(stderr, "dss key generation failed\n");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	163 fp_add_d(&h, 1, &h);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	165 } while (fp_cmp_d(key->g, 1) != FP_GT);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	167 fp_zero(&div);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	168 fp_zero(&h);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	169 fp_zero(&val);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 static void getx(dss_key *key) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	174 gen_random_fpint(key->q, key->x);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 static void gety(dss_key *key) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	179 if (fp_exptmod(key->g, key->x, key->p, key->y) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 fprintf(stderr, "dss key generation failed\n");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 #endif /* DROPBEAR_DSS */

Mercurial > dropbear

annotate gendss.c @ 640:76097ec1a29a dropbear-tfm