trunk/src/rsa.c

/*
 *  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));
}

static void
binary_to_hex(unsigned char *bin, char *hex, unsigned int length)
{
  static const char trans[] = "0123456789ABCDEF";
  unsigned int i = 0;

  for (; i < length; ++i)
  {
    hex[(i << 1)    ] = trans[bin[i] >> 4];
    hex[(i << 1) + 1] = trans[bin[i] & 0xf];
  }

  hex[i << 1] = '\0';
}

int
get_randomness(unsigned char *buf, int length)
{
  /* Seed OpenSSL PRNG with EGD enthropy pool -kre */
  if (ConfigFileEntry.use_egd && ConfigFileEntry.egdpool_path)
    if (RAND_egd(ConfigFileEntry.egdpool_path) == -1)
      return -1;

  if (RAND_status())
    return RAND_bytes(buf, length);
  /* XXX - abort? */
  return RAND_pseudo_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;

  get_randomness(secret, 32);
  *r_response = MyCalloc(65);
  binary_to_hex(secret, *r_response, 32);

  length = RSA_size(rsa);
  tmp = MyCalloc(length);
  ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);

  *r_challenge = MyCalloc((length << 1) + 1);
  binary_to_hex( tmp, *r_challenge, length);
  (*r_challenge)[length << 1] = 0;
  MyFree(tmp);

  if (ret < 0)
  {
    report_crypto_errors();
    return -1;
  }

  return 0;
}
#endif
Revision:	3504
Committed:	Sat May 10 19:51:29 2014 UTC (11 years, 3 months ago) by michael
Content type:	text/x-csrc
File size:	2802 byte(s)
Log Message:	- Renamed MyMalloc() to MyCalloc()
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 2000-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19			* USA
20			*/
21
22	michael	2916	/*! \file rsa.c
23			* \brief Functions for use with RSA public key cryptography.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	michael	1307	#ifdef HAVE_LIBCRYPTO
29	adx	30	#include <openssl/pem.h>
30			#include <openssl/rand.h>
31			#include <openssl/rsa.h>
32			#include <openssl/bn.h>
33			#include <openssl/evp.h>
34			#include <openssl/err.h>
35	michael	1013	#include <openssl/opensslv.h>
36	adx	30
37			#include "memory.h"
38			#include "rsa.h"
39	michael	1309	#include "conf.h"
40			#include "log.h"
41	adx	30
42
43			/*
44			* report_crypto_errors - Dump crypto error list to log
45			*/
46			void
47			report_crypto_errors(void)
48			{
49	michael	1752	unsigned long e = 0;
50	adx	30
51	michael	1752	while ((e = ERR_get_error()))
52	michael	1247	ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
53	adx	30	}
54
55			static void
56	michael	3457	binary_to_hex(unsigned char bin, char hex, unsigned int length)
57	adx	30	{
58			static const char trans[] = "0123456789ABCDEF";
59	michael	3457	unsigned int i = 0;
60	adx	30
61	michael	3457	for (; i < length; ++i)
62	adx	30	{
63	michael	2134	hex[(i << 1) ] = trans[bin[i] >> 4];
64	adx	30	hex[(i << 1) + 1] = trans[bin[i] & 0xf];
65			}
66
67			hex[i << 1] = '\0';
68			}
69
70			int
71			get_randomness(unsigned char *buf, int length)
72			{
73	michael	2134	/* Seed OpenSSL PRNG with EGD enthropy pool -kre */
74	michael	3335	if (ConfigFileEntry.use_egd && ConfigFileEntry.egdpool_path)
75	michael	2134	if (RAND_egd(ConfigFileEntry.egdpool_path) == -1)
76			return -1;
77	adx	30
78			if (RAND_status())
79	michael	2134	return RAND_bytes(buf, length);
80			/* XXX - abort? */
81			return RAND_pseudo_bytes(buf, length);
82	adx	30	}
83
84			int
85			generate_challenge(char r_challenge, char r_response, RSA *rsa)
86			{
87	michael	3335	unsigned char secret[32], *tmp = NULL;
88			unsigned long length = 0;
89	adx	30	int ret = -1;
90
91			if (!rsa)
92	michael	1307	return -1;
93
94	adx	30	get_randomness(secret, 32);
95	michael	3504	*r_response = MyCalloc(65);
96	adx	30	binary_to_hex(secret, *r_response, 32);
97
98			length = RSA_size(rsa);
99	michael	3504	tmp = MyCalloc(length);
100	adx	30	ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);
101
102	michael	3504	*r_challenge = MyCalloc((length << 1) + 1);
103	adx	30	binary_to_hex( tmp, *r_challenge, length);
104	michael	3335	(*r_challenge)[length << 1] = 0;
105	adx	30	MyFree(tmp);
106
107			if (ret < 0)
108			{
109			report_crypto_errors();
110			return -1;
111			}
112	michael	1307
113	adx	30	return 0;
114			}
115	michael	1307	#endif