/* $NetBSD: plainrsa-gen.c,v 1.4 2006/09/09 16:22:10 manu Exp $ */
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/* Id: plainrsa-gen.c,v 1.6 2005/04/21 09:08:40 monas Exp */
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/*
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* Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
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* Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* This file contains a generator for FreeS/WAN-style ipsec.secrets RSA keys. */
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <openssl/bio.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/objects.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#ifdef HAVE_OPENSSL_ENGINE_H
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#include <openssl/engine.h>
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#endif
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#include "misc.h"
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#include "vmbuf.h"
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#include "plog.h"
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#include "crypto_openssl.h"
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#include "package_version.h"
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void
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usage (char *argv0)
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{
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fprintf(stderr, "Plain RSA key generator, part of %s\n", TOP_PACKAGE_STRING);
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fprintf(stderr, "By Michal Ludvig (http://www.logix.cz/michal)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Usage: %s [options]\n", argv0);
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fprintf(stderr, "\n");
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fprintf(stderr, " -b bits Generate <bits> long RSA key (default=1024)\n");
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fprintf(stderr, " -e pubexp Public exponent to use (default=0x3)\n");
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fprintf(stderr, " -f filename Filename to store the key to (default=stdout)\n");
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fprintf(stderr, " -h Help\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Report bugs to <ipsec-tools-devel@lists.sourceforge.net>\n");
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exit(1);
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}
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/*
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* See RFC 2065, section 3.5 for details about the output format.
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*/
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vchar_t *
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mix_b64_pubkey(RSA *key)
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{
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char *binbuf;
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long binlen, ret;
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vchar_t *res;
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binlen = 1 + BN_num_bytes(key->e) + BN_num_bytes(key->n);
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binbuf = malloc(binlen);
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memset(binbuf, 0, binlen);
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binbuf[0] = BN_bn2bin(key->e, (unsigned char *) &binbuf[1]);
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ret = BN_bn2bin(key->n, (unsigned char *) (&binbuf[binbuf[0] + 1]));
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if (1 + binbuf[0] + ret != binlen) {
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plog(LLV_ERROR, LOCATION, NULL,
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"Pubkey generation failed. This is really strange...\n");
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return NULL;
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}
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return base64_encode(binbuf, binlen);
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}
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char *
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lowercase(char *input)
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{
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char *ptr = input;
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while (*ptr) {
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if (*ptr >= 'A' && *ptr <= 'F')
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*ptr -= 'A' - 'a';
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*ptr++;
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}
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return input;
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}
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int
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gen_rsa_key(FILE *fp, size_t bits, unsigned long exp)
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{
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RSA *key;
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vchar_t *pubkey64 = NULL;
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key = RSA_generate_key(bits, exp, NULL, NULL);
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if (!key) {
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fprintf(stderr, "RSA_generate_key(): %s\n", eay_strerror());
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return -1;
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}
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pubkey64 = mix_b64_pubkey(key);
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if (!pubkey64) {
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fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
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return -1;
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}
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fprintf(fp, "# : PUB 0s%s\n", pubkey64->v);
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fprintf(fp, ": RSA\t{\n");
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fprintf(fp, "\t# RSA %zu bits\n", bits);
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fprintf(fp, "\t# pubkey=0s%s\n", pubkey64->v);
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fprintf(fp, "\tModulus: 0x%s\n", lowercase(BN_bn2hex(key->n)));
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fprintf(fp, "\tPublicExponent: 0x%s\n", lowercase(BN_bn2hex(key->e)));
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fprintf(fp, "\tPrivateExponent: 0x%s\n", lowercase(BN_bn2hex(key->d)));
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fprintf(fp, "\tPrime1: 0x%s\n", lowercase(BN_bn2hex(key->p)));
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fprintf(fp, "\tPrime2: 0x%s\n", lowercase(BN_bn2hex(key->q)));
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fprintf(fp, "\tExponent1: 0x%s\n", lowercase(BN_bn2hex(key->dmp1)));
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fprintf(fp, "\tExponent2: 0x%s\n", lowercase(BN_bn2hex(key->dmq1)));
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fprintf(fp, "\tCoefficient: 0x%s\n", lowercase(BN_bn2hex(key->iqmp)));
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fprintf(fp, " }\n");
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vfree(pubkey64);
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return 0;
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}
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int
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main (int argc, char *argv[])
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{
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FILE *fp = stdout;
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size_t bits = 1024;
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unsigned int pubexp = 0x3;
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struct stat st;
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extern char *optarg;
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extern int optind;
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int c;
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char *fname = NULL;
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while ((c = getopt(argc, argv, "e:b:f:h")) != -1)
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switch (c) {
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case 'e':
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if (strncmp(optarg, "0x", 2) == 0)
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sscanf(optarg, "0x%x", &pubexp);
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else
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pubexp = atoi(optarg);
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break;
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case 'b':
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bits = atoi(optarg);
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break;
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case 'f':
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fname = optarg;
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break;
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case 'h':
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default:
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usage(argv[0]);
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}
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if (fname) {
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if (stat(fname, &st) >= 0) {
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fprintf(stderr, "%s: file exists! Please use a different name.\n", fname);
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exit(1);
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}
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umask(0077);
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fp = fopen(fname, "w");
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if (fp == NULL) {
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fprintf(stderr, "%s: %s\n", fname, strerror(errno));
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exit(1);
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}
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}
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ploginit();
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eay_init();
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gen_rsa_key(fp, bits, pubexp);
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fclose(fp);
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return 0;
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}
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