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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