dropbear: genrsa.c annotate

annotate genrsa.c @ 647:939cd3e22c87 dropbear-tfm

- Fix constraints so we don't get warned about uninitialised variable (it isn't used as input by the asm)

author	Matt Johnston <matt@ucc.asn.au>
date	Wed, 30 Nov 2011 23:15:21 +0800
parents	2b1bb792cd4d
children

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 "bignum.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "random.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "rsa.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "genrsa.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #define RSA_E 65537
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 #ifdef DROPBEAR_RSA
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	36 static void getrsaprime(fp_int* prime, fp_int *primeminus,
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	37 fp_int* rsa_e, unsigned int size);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 /* mostly taken from libtomcrypt's rsa key generation routine */
586 b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	40 dropbear_rsa_key * gen_rsa_priv_key(unsigned int size) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41
586 b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	42 dropbear_rsa_key * key;
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	43 DEF_FP_INT(pminus);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	44 DEF_FP_INT(qminus);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	45 DEF_FP_INT(lcm);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46
586 b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	47 key = m_malloc(sizeof(*key));
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	49 key->e = (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: 477 diff changeset	50 key->n = (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: 477 diff changeset	51 key->d = (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: 477 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: 477 diff changeset	53 key->q = (fp_int*)m_malloc(sizeof(fp_int));
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	55 m_fp_init_multi(key->e, key->n, key->d, key->p, key->q,
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 &pminus, &lcm, &qminus, NULL);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 seedrandom();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	60 fp_set(key->e, RSA_E);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 getrsaprime(key->p, &pminus, key->e, size/2);
477 657c045054ab Remove workaround forcing rsa mpint to exactly a 8 bits multiple for putty (see Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	63 getrsaprime(key->q, &qminus, key->e, size/2);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	65 fp_mul(key->p, key->q, key->n);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	66
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	67 /* lcm(p-1, q-1) */
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	68 fp_lcm(&pminus, &qminus, &lcm);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	69
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	70 /* de = 1 mod lcm(p-1,q-1) */
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	71 /* therefore d = (e^-1) mod lcm(p-1,q-1) */
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	72 if (fp_invmod(key->e, &lcm, key->d) != FP_OKAY) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 fprintf(stderr, "rsa generation failed\n");
477 657c045054ab Remove workaround forcing rsa mpint to exactly a 8 bits multiple for putty (see Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	74 exit(1);
657c045054ab Remove workaround forcing rsa mpint to exactly a 8 bits multiple for putty (see Matt Johnston <matt@ucc.asn.au> parents: 188 diff changeset	75 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	77 m_fp_zero_multi(&pminus, &qminus, &lcm, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 return key;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 }
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 /* return a prime suitable for p or q */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	83 static void getrsaprime(fp_int* prime, fp_int *primeminus,
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	84 fp_int* rsa_e, unsigned int size) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 unsigned char *buf;
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	87 DEF_FP_INT(temp_gcd);
4 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 buf = (unsigned char*)m_malloc(size+1);
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: 477 diff changeset	91 m_fp_init(&temp_gcd);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92 do {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 /* generate a random odd number with MSB set, then find the
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 the next prime above it */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 genrandom(buf, size+1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 buf[0] \|= 0x80; /* MSB set */
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: 477 diff changeset	98 bytes_to_fp(prime, buf, size+1);
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 /* find the next integer which is prime, 8 round of miller-rabin */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	101 if (fp_prime_next_prime(prime, 8, 0) != FP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	102 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 }
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 /* subtract one to get p-1 */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	107 fp_sub_d(prime, 1, primeminus);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 /* check relative primality to e */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	109 fp_gcd(primeminus, rsa_e, &temp_gcd);
76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	110 } while (fp_cmp_d(&temp_gcd, 1) != FP_EQ); /* while gcd(p-1, e) != 1 */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 /* now we have a good value for result */
640 76097ec1a29a - Bring in original tomsfastmath patch against 0.52 from Peter Turczak Matt Johnston <matt@ucc.asn.au> parents: 477 diff changeset	113 fp_zero(&temp_gcd);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 m_burn(buf, size+1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 m_free(buf);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 #endif /* DROPBEAR_RSA */

Mercurial > dropbear

annotate genrsa.c @ 647:939cd3e22c87 dropbear-tfm