1/*	$NetBSD: plainrsa-gen.c,v 1.4 2006/09/09 16:22:10 manu Exp $	*/
2
3/* Id: plainrsa-gen.c,v 1.6 2005/04/21 09:08:40 monas Exp */
4/*
5 * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
6 * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/* This file contains a generator for FreeS/WAN-style ipsec.secrets RSA keys. */
35
36#include "config.h"
37
38#include <stdio.h>
39#include <string.h>
40#include <errno.h>
41
42#include <sys/types.h>
43#include <sys/stat.h>
44#include <sys/socket.h>
45#include <unistd.h>
46
47#include <openssl/bio.h>
48#include <openssl/bn.h>
49#include <openssl/err.h>
50#include <openssl/objects.h>
51#include <openssl/rsa.h>
52#include <openssl/evp.h>
53#ifdef HAVE_OPENSSL_ENGINE_H
54#include <openssl/engine.h>
55#endif
56
57#include "misc.h"
58#include "vmbuf.h"
59#include "plog.h"
60#include "crypto_openssl.h"
61
62#include "package_version.h"
63
64void
65usage (char *argv0)
66{
67	fprintf(stderr, "Plain RSA key generator, part of %s\n", TOP_PACKAGE_STRING);
68	fprintf(stderr, "By Michal Ludvig (http://www.logix.cz/michal)\n");
69	fprintf(stderr, "\n");
70	fprintf(stderr, "Usage: %s [options]\n", argv0);
71	fprintf(stderr, "\n");
72	fprintf(stderr, "  -b bits       Generate <bits> long RSA key (default=1024)\n");
73	fprintf(stderr, "  -e pubexp     Public exponent to use (default=0x3)\n");
74	fprintf(stderr, "  -f filename   Filename to store the key to (default=stdout)\n");
75	fprintf(stderr, "  -h            Help\n");
76	fprintf(stderr, "\n");
77	fprintf(stderr, "Report bugs to <ipsec-tools-devel@lists.sourceforge.net>\n");
78	exit(1);
79}
80
81/*
82 * See RFC 2065, section 3.5 for details about the output format.
83 */
84vchar_t *
85mix_b64_pubkey(RSA *key)
86{
87	char *binbuf;
88	long binlen, ret;
89	vchar_t *res;
90
91	binlen = 1 + BN_num_bytes(key->e) + BN_num_bytes(key->n);
92	binbuf = malloc(binlen);
93	memset(binbuf, 0, binlen);
94	binbuf[0] = BN_bn2bin(key->e, (unsigned char *) &binbuf[1]);
95	ret = BN_bn2bin(key->n, (unsigned char *) (&binbuf[binbuf[0] + 1]));
96	if (1 + binbuf[0] + ret != binlen) {
97		plog(LLV_ERROR, LOCATION, NULL,
98		     "Pubkey generation failed. This is really strange...\n");
99		return NULL;
100	}
101
102	return base64_encode(binbuf, binlen);
103}
104
105char *
106lowercase(char *input)
107{
108	char *ptr = input;
109	while (*ptr) {
110		if (*ptr >= 'A' && *ptr <= 'F')
111			*ptr -= 'A' - 'a';
112		*ptr++;
113	}
114
115	return input;
116}
117
118int
119gen_rsa_key(FILE *fp, size_t bits, unsigned long exp)
120{
121	RSA *key;
122	vchar_t *pubkey64 = NULL;
123
124	key = RSA_generate_key(bits, exp, NULL, NULL);
125	if (!key) {
126		fprintf(stderr, "RSA_generate_key(): %s\n", eay_strerror());
127		return -1;
128	}
129
130	pubkey64 = mix_b64_pubkey(key);
131	if (!pubkey64) {
132		fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
133		return -1;
134	}
135
136	fprintf(fp, "# : PUB 0s%s\n", pubkey64->v);
137	fprintf(fp, ": RSA\t{\n");
138	fprintf(fp, "\t# RSA %zu bits\n", bits);
139	fprintf(fp, "\t# pubkey=0s%s\n", pubkey64->v);
140	fprintf(fp, "\tModulus: 0x%s\n", lowercase(BN_bn2hex(key->n)));
141	fprintf(fp, "\tPublicExponent: 0x%s\n", lowercase(BN_bn2hex(key->e)));
142	fprintf(fp, "\tPrivateExponent: 0x%s\n", lowercase(BN_bn2hex(key->d)));
143	fprintf(fp, "\tPrime1: 0x%s\n", lowercase(BN_bn2hex(key->p)));
144	fprintf(fp, "\tPrime2: 0x%s\n", lowercase(BN_bn2hex(key->q)));
145	fprintf(fp, "\tExponent1: 0x%s\n", lowercase(BN_bn2hex(key->dmp1)));
146	fprintf(fp, "\tExponent2: 0x%s\n", lowercase(BN_bn2hex(key->dmq1)));
147	fprintf(fp, "\tCoefficient: 0x%s\n", lowercase(BN_bn2hex(key->iqmp)));
148	fprintf(fp, "  }\n");
149
150	vfree(pubkey64);
151
152	return 0;
153}
154
155int
156main (int argc, char *argv[])
157{
158	FILE *fp = stdout;
159	size_t bits = 1024;
160	unsigned int pubexp = 0x3;
161	struct stat st;
162	extern char *optarg;
163	extern int optind;
164	int c;
165	char *fname = NULL;
166
167	while ((c = getopt(argc, argv, "e:b:f:h")) != -1)
168		switch (c) {
169			case 'e':
170				if (strncmp(optarg, "0x", 2) == 0)
171					sscanf(optarg, "0x%x", &pubexp);
172				else
173					pubexp = atoi(optarg);
174				break;
175			case 'b':
176				bits = atoi(optarg);
177				break;
178			case 'f':
179				fname = optarg;
180				break;
181			case 'h':
182			default:
183				usage(argv[0]);
184		}
185
186	if (fname) {
187		if (stat(fname, &st) >= 0) {
188			fprintf(stderr, "%s: file exists! Please use a different name.\n", fname);
189			exit(1);
190		}
191
192		umask(0077);
193		fp = fopen(fname, "w");
194		if (fp == NULL) {
195			fprintf(stderr, "%s: %s\n", fname, strerror(errno));
196			exit(1);
197		}
198	}
199
200	ploginit();
201	eay_init();
202
203	gen_rsa_key(fp, bits, pubexp);
204
205	fclose(fp);
206
207	return 0;
208}
209