ipsec-tools/racoon/plainrsa-gen.c

   1 /* $Id: plainrsa-gen.c,v 1.4.8.2 2005/04/21 09:07:20 monas Exp $ */
   2 /*
   3  * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
   4  * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /* This file contains a generator for FreeS/WAN-style ipsec.secrets RSA keys. */
  33
  34 #include "config.h"
  35
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <errno.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/socket.h>
  43 #include <unistd.h>
  44
  45 #include <openssl/bio.h>
  46 #include <openssl/bn.h>
  47 #include <openssl/err.h>
  48 #include <openssl/objects.h>
  49 #include <openssl/rsa.h>
  50 #include <openssl/evp.h>
  51 #ifdef HAVE_OPENSSL_ENGINE_H
  52 #include <openssl/engine.h>
  53 #endif
  54
  55 #include "misc.h"
  56 #include "vmbuf.h"
  57 #include "plog.h"
  58 #include "crypto_openssl.h"
  59
  60 //#include "package_version.h"
  61
  62 int print_pid = 0;
  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, "Plain RSA key generator\n");
  69         fprintf(stderr, "By Michal Ludvig (http://www.logix.cz/michal)\n");
  70         fprintf(stderr, "\n");
  71         fprintf(stderr, "Usage: %s [options]\n", argv0);
  72         fprintf(stderr, "\n");
  73         fprintf(stderr, "  -b bits       Generate <bits> long RSA key (default=1024)\n");
  74         fprintf(stderr, "  -e pubexp     Public exponent to use (default=0x3)\n");
  75         fprintf(stderr, "  -f filename   Filename to store the key to (default=stdout)\n");
  76         fprintf(stderr, "  -h            Help\n");
  77         fprintf(stderr, "\n");
  78         fprintf(stderr, "Report bugs to <ipsec-tools-devel@lists.sourceforge.net>\n");
  79         exit(1);
  80 }
  81
  82 /*
  83  * See RFC 2065, section 3.5 for details about the output format.
  84  */
  85 vchar_t *
  86 mix_b64_pubkey(RSA *key)
  87 {
  88         char *binbuf;
  89         long binlen, ret;
  90         vchar_t *res;
  91
  92         binlen = 1 + BN_num_bytes(key->e) + BN_num_bytes(key->n);
  93         binbuf = malloc(binlen);
  94         memset(binbuf, 0, binlen);
  95         binbuf[0] = BN_bn2bin(key->e, (unsigned char *) &binbuf[1]);
  96         ret = BN_bn2bin(key->n, (unsigned char *) (&binbuf[binbuf[0] + 1]));
  97         if (1 + binbuf[0] + ret != binlen) {
  98                 plog(LLV_ERROR, LOCATION, NULL,
  99                      "Pubkey generation failed. This is really strange...\n");
 100                 return NULL;
 101         }
 102
 103         return base64_encode(binbuf, binlen);
 104 }
 105
 106 char *
 107 lowercase(char *input)
 108 {
 109         char *ptr = input;
 110         while (*ptr) {
 111                 if (*ptr >= 'A' && *ptr <= 'F')
 112                         *ptr -= 'A' - 'a';
 113                 *ptr++;
 114         }
 115
 116         return input;
 117 }
 118
 119 int
 120 gen_rsa_key(FILE *fp, size_t bits, unsigned long exp)
 121 {
 122         RSA *key;
 123         vchar_t *pubkey64 = NULL;
 124
 125         key = RSA_generate_key(bits, exp, NULL, NULL);
 126         if (!key) {
 127                 fprintf(stderr, "RSA_generate_key(): %s\n", eay_strerror());
 128                 return -1;
 129         }
 130
 131         pubkey64 = mix_b64_pubkey(key);
 132         if (!pubkey64) {
 133                 fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
 134                 return -1;
 135         }
 136
 137         fprintf(fp, "# : PUB 0s%s\n", pubkey64->v);
 138         fprintf(fp, ": RSA\t{\n");
 139         fprintf(fp, "\t# RSA %zu bits\n", bits);
 140         fprintf(fp, "\t# pubkey=0s%s\n", pubkey64->v);
 141         fprintf(fp, "\tModulus: 0x%s\n", lowercase(BN_bn2hex(key->n)));
 142         fprintf(fp, "\tPublicExponent: 0x%s\n", lowercase(BN_bn2hex(key->e)));
 143         fprintf(fp, "\tPrivateExponent: 0x%s\n", lowercase(BN_bn2hex(key->d)));
 144         fprintf(fp, "\tPrime1: 0x%s\n", lowercase(BN_bn2hex(key->p)));
 145         fprintf(fp, "\tPrime2: 0x%s\n", lowercase(BN_bn2hex(key->q)));
 146         fprintf(fp, "\tExponent1: 0x%s\n", lowercase(BN_bn2hex(key->dmp1)));
 147         fprintf(fp, "\tExponent2: 0x%s\n", lowercase(BN_bn2hex(key->dmq1)));
 148         fprintf(fp, "\tCoefficient: 0x%s\n", lowercase(BN_bn2hex(key->iqmp)));
 149         fprintf(fp, "  }\n");
 150
 151         vfree(pubkey64);
 152
 153         return 0;
 154 }
 155
 156 int
 157 main (int argc, char *argv[])
 158 {
 159         FILE *fp = stdout;
 160         size_t bits = 1024;
 161         unsigned int pubexp = 0x3;
 162         struct stat st;
 163         extern char *optarg;
 164         extern int optind;
 165         int c;
 166         char *fname = NULL;
 167
 168         while ((c = getopt(argc, argv, "e:b:f:h")) != -1)
 169                 switch (c) {
 170                         case 'e':
 171                                 if (strncmp(optarg, "0x", 2) == 0)
 172                                         sscanf(optarg, "0x%x", &pubexp);
 173                                 else
 174                                         pubexp = atoi(optarg);
 175                                 break;
 176                         case 'b':
 177                                 bits = atoi(optarg);
 178                                 break;
 179                         case 'f':
 180                                 fname = optarg;
 181                                 break;
 182                         case 'h':
 183                         default:
 184                                 usage(argv[0]);
 185                 }
 186
 187         if (fname) {
 188                 if (stat(fname, &st) >= 0) {
 189                         fprintf(stderr, "%s: file exists! Please use a different name.\n", fname);
 190                         exit(1);
 191                 }
 192
 193                 umask(0077);
 194                 fp = fopen(fname, "w");
 195                 if (fp == NULL) {
 196                         fprintf(stderr, "%s: %s\n", fname, strerror(errno));
 197                         exit(1);
 198                 }
 199         }
 200
 201         ploginit();
 202         eay_init();
 203
 204         gen_rsa_key(fp, bits, pubexp);
 205
 206         fclose(fp);
 207
 208         return 0;
 209 }