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
64 void
usage(char * argv0)65 usage (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 */
84 vchar_t *
mix_b64_pubkey(RSA * key)85 mix_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
105 char *
lowercase(char * input)106 lowercase(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
118 int
gen_rsa_key(FILE * fp,size_t bits,unsigned long exp)119 gen_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
155 int
main(int argc,char * argv[])156 main (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