crypto/dist/ipsec-tools/src/racoon/plainrsa-gen.c

   1 /*      $NetBSD$        */
   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
  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 *
  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 *
 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
 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
 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 }