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Sourcecode: ipsec-tools version File versions

plainrsa-gen.c

/* $Id: plainrsa-gen.c,v 1.4.6.1 2005/04/21 08:57:17 monas Exp $ */
/*
 * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
 * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* This file contains a generator for FreeS/WAN-style ipsec.secrets RSA keys. */

#include "config.h"

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#ifdef HAVE_OPENSSL_ENGINE_H
#include <openssl/engine.h>
#endif

#include "misc.h"
#include "vmbuf.h"
#include "plog.h"
#include "crypto_openssl.h"

#include "../../package_version.h"

void
usage (char *argv0)
{
      fprintf(stderr, "Plain RSA key generator, part of %s\n", TOP_PACKAGE_STRING);
      fprintf(stderr, "By Michal Ludvig (http://www.logix.cz/michal)\n");
      fprintf(stderr, "\n");
      fprintf(stderr, "Usage: %s [options]\n", argv0);
      fprintf(stderr, "\n");
      fprintf(stderr, "  -b bits       Generate <bits> long RSA key (default=1024)\n");
      fprintf(stderr, "  -e pubexp     Public exponent to use (default=0x3)\n");
      fprintf(stderr, "  -f filename   Filename to store the key to (default=stdout)\n");
      fprintf(stderr, "  -h            Help\n");
      fprintf(stderr, "\n");
      fprintf(stderr, "Report bugs to <ipsec-tools-devel@lists.sourceforge.net>\n");
      exit(1);
}

/*
 * See RFC 2065, section 3.5 for details about the output format.
 */
vchar_t *
mix_b64_pubkey(RSA *key)
{
      char *binbuf;
      long binlen, ret;
      vchar_t *res;
      
      binlen = 1 + BN_num_bytes(key->e) + BN_num_bytes(key->n);
      binbuf = malloc(binlen);
      memset(binbuf, 0, binlen);
      binbuf[0] = BN_bn2bin(key->e, (unsigned char *) &binbuf[1]);
      ret = BN_bn2bin(key->n, (unsigned char *) (&binbuf[binbuf[0] + 1]));
      if (1 + binbuf[0] + ret != binlen) {
            plog(LLV_ERROR, LOCATION, NULL,
                 "Pubkey generation failed. This is really strange...\n");
            return NULL;
      }

      return base64_encode(binbuf, binlen);
}

char *
lowercase(char *input)
{
      char *ptr = input;
      while (*ptr) {
            if (*ptr >= 'A' && *ptr <= 'F')
                  *ptr -= 'A' - 'a';
            *ptr++;
      }

      return input;
}

int
gen_rsa_key(FILE *fp, size_t bits, unsigned long exp)
{
      RSA *key;
      vchar_t *pubkey64 = NULL;

      key = RSA_generate_key(bits, exp, NULL, NULL);
      if (!key) {
            fprintf(stderr, "RSA_generate_key(): %s\n", eay_strerror());
            return -1;
      }
      
      pubkey64 = mix_b64_pubkey(key);
      if (!pubkey64) {
            fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
            return -1;
      }
      
      fprintf(fp, "# : PUB 0s%s\n", pubkey64->v);
      fprintf(fp, ": RSA\t{\n");
      fprintf(fp, "\t# RSA %zu bits\n", bits);
      fprintf(fp, "\t# pubkey=0s%s\n", pubkey64->v);
      fprintf(fp, "\tModulus: 0x%s\n", lowercase(BN_bn2hex(key->n)));
      fprintf(fp, "\tPublicExponent: 0x%s\n", lowercase(BN_bn2hex(key->e)));
      fprintf(fp, "\tPrivateExponent: 0x%s\n", lowercase(BN_bn2hex(key->d)));
      fprintf(fp, "\tPrime1: 0x%s\n", lowercase(BN_bn2hex(key->p)));
      fprintf(fp, "\tPrime2: 0x%s\n", lowercase(BN_bn2hex(key->q)));
      fprintf(fp, "\tExponent1: 0x%s\n", lowercase(BN_bn2hex(key->dmp1)));
      fprintf(fp, "\tExponent2: 0x%s\n", lowercase(BN_bn2hex(key->dmq1)));
      fprintf(fp, "\tCoefficient: 0x%s\n", lowercase(BN_bn2hex(key->iqmp)));
      fprintf(fp, "  }\n");

      vfree(pubkey64);

      return 0;
}

int
main (int argc, char *argv[])
{
      FILE *fp = stdout;
      size_t bits = 1024;
      unsigned int pubexp = 0x3;
      struct stat st;
      extern char *optarg;
      extern int optind;
      int c;
      char *fname = NULL;

      while ((c = getopt(argc, argv, "e:b:f:h")) != -1)
            switch (c) {
                  case 'e':
                        if (strncmp(optarg, "0x", 2) == 0)
                              sscanf(optarg, "0x%x", &pubexp);
                        else
                              pubexp = atoi(optarg);
                        break;
                  case 'b':
                        bits = atoi(optarg);
                        break;
                  case 'f':
                        fname = optarg;
                        break;
                  case 'h':
                  default:
                        usage(argv[0]);
            }

      if (fname) {
            if (stat(fname, &st) >= 0) {
                  fprintf(stderr, "%s: file exists! Please use a different name.\n", fname);
                  exit(1);
            }

            umask(0077);
            fp = fopen(fname, "w");
            if (fp == NULL) {
                  fprintf(stderr, "%s: %s\n", fname, strerror(errno));
                  exit(1);
            }
      }

      ploginit();
      eay_init();

      gen_rsa_key(fp, bits, pubexp);

      fclose(fp);

      return 0;
}

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