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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 2000-2014 ircd-hybrid development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*! \file rsa.c
* \brief Functions for use with RSA public key cryptography.
* \version $Id$
*/
#include "stdinc.h"
#ifdef HAVE_LIBCRYPTO
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/opensslv.h>
#include "memory.h"
#include "rsa.h"
#include "conf.h"
#include "log.h"
/*
* report_crypto_errors - Dump crypto error list to log
*/
void
report_crypto_errors(void)
{
unsigned long e = 0;
while ((e = ERR_get_error()))
ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
}
void
binary_to_hex(const unsigned char *bin, char *hex, unsigned int length)
{
static const char trans[] = "0123456789ABCDEF";
for (const unsigned char *end = bin + length; bin < end; ++bin)
{
*hex++ = trans[*bin >> 4];
*hex++ = trans[*bin & 0xf];
}
*hex = '\0';
}
int
get_randomness(unsigned char *buf, int length)
{
return RAND_bytes(buf, length);
}
int
generate_challenge(char **r_challenge, char **r_response, RSA *rsa)
{
unsigned char secret[32], *tmp = NULL;
unsigned long length = 0;
int ret = -1;
if (!rsa)
return -1;
if (!get_randomness(secret, 32))
{
report_crypto_errors();
return -1;
}
*r_response = MyMalloc(65);
binary_to_hex(secret, *r_response, 32);
length = RSA_size(rsa);
tmp = MyMalloc(length);
ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);
*r_challenge = MyMalloc((length << 1) + 1);
binary_to_hex(tmp, *r_challenge, length);
MyFree(tmp);
if (ret < 0)
{
report_crypto_errors();
return -1;
}
return 0;
}
#endif
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