dropbear: genrsa.c annotate

annotate genrsa.c @ 1873:2c9d635a1c04

Avoid unused argument warning when reexec is unused

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 03 Feb 2022 22:12:11 +0800
parents	1051e4eea25a
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"
858 220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h Matt Johnston <matt@ucc.asn.au> parents: 805 diff changeset	28 #include "dbrandom.h"
4 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
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 892 diff changeset	34 #if DROPBEAR_RSA
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 static void getrsaprime(mp_int* prime, mp_int *primeminus,
794 d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	37 mp_int* rsa_e, unsigned int size_bytes);
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;
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	43 DEF_MP_INT(pminus);
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	44 DEF_MP_INT(qminus);
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	45 DEF_MP_INT(lcm);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46
794 d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	47 if (size < 512 \|\| size > 4096 \|\| (size % 8 != 0)) {
d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	48 dropbear_exit("Bits must satisfy 512 <= bits <= 4096, and be a"
d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	49 " multiple of 8");
d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	50 }
d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	51
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	52 key = m_malloc(sizeof(*key));
805 724c3e0c8734 Add m_mp_alloc_init_multi() helper Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	53 m_mp_alloc_init_multi(&key->e, &key->n, &key->d, &key->p, &key->q, NULL);
724c3e0c8734 Add m_mp_alloc_init_multi() helper Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	54 m_mp_init_multi(&pminus, &lcm, &qminus, NULL);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55
1692 1051e4eea25a Update LibTomMath to 1.2.0 (#84) Steffen Jaeckel <s@jaeckel.eu> parents: 1655 diff changeset	56 mp_set_ul(key->e, RSA_E);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	58 while (1) {
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	59 getrsaprime(key->p, &pminus, key->e, size/16);
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	60 getrsaprime(key->q, &qminus, key->e, size/16);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	62 if (mp_mul(key->p, key->q, key->n) != MP_OKAY) {
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	63 fprintf(stderr, "RSA generation failed\n");
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	64 exit(1);
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	65 }
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	66
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	67 if ((unsigned int)mp_count_bits(key->n) == size) {
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	68 break;
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	69 }
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	70 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 /* lcm(p-1, q-1) */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 if (mp_lcm(&pminus, &qminus, &lcm) != MP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	74 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 /* de = 1 mod lcm(p-1,q-1) */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 /* therefore d = (e^-1) mod lcm(p-1,q-1) */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 if (mp_invmod(key->e, &lcm, key->d) != MP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	81 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 exit(1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 mp_clear_multi(&pminus, &qminus, &lcm, NULL);
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 return key;
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
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 /* return a prime suitable for p or q */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 static void getrsaprime(mp_int* prime, mp_int *primeminus,
794 d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 689 diff changeset	92 mp_int* rsa_e, unsigned int size_bytes) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 unsigned char *buf;
1655 f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79) Steffen Jaeckel <s_jaeckel@gmx.de> parents: 1295 diff changeset	95 int trials;
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	96 DEF_MP_INT(temp_gcd);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	98 buf = (unsigned char*)m_malloc(size_bytes);
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 m_mp_init(&temp_gcd);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 do {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 /* 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	103 the next prime above it */
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	104 genrandom(buf, size_bytes);
ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	105 buf[0] \|= 0x80;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	107 bytes_to_mp(prime, buf, size_bytes);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108
1655 f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79) Steffen Jaeckel <s_jaeckel@gmx.de> parents: 1295 diff changeset	109 /* find the next integer which is prime */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79) Steffen Jaeckel <s_jaeckel@gmx.de> parents: 1295 diff changeset	110 trials = mp_prime_rabin_miller_trials(mp_count_bits(prime));
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79) Steffen Jaeckel <s_jaeckel@gmx.de> parents: 1295 diff changeset	111 if (mp_prime_next_prime(prime, trials, 0) != MP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	112 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 exit(1);
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
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 /* subtract one to get p-1 */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 if (mp_sub_d(prime, 1, primeminus) != MP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	118 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 exit(1);
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 /* check relative primality to e */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 if (mp_gcd(primeminus, rsa_e, &temp_gcd) != MP_OKAY) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 586 diff changeset	123 fprintf(stderr, "RSA generation failed\n");
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 exit(1);
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 } while (mp_cmp_d(&temp_gcd, 1) != MP_EQ); /* while gcd(p-1, e) != 1 */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 /* now we have a good value for result */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 mp_clear(&temp_gcd);
892 ae766a2c8fa7 generate RSA keys of exact length Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	130 m_burn(buf, size_bytes);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 m_free(buf);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 #endif /* DROPBEAR_RSA */

Mercurial > dropbear

annotate genrsa.c @ 1873:2c9d635a1c04