/* $NetBSD: plainrsa-gen.c,v 1.4 2006/09/09 16:22:10 manu Exp $ */
/* Id: plainrsa-gen.c,v 1.6 2005/04/21 09:08:40 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;
}