trunk/src/rsa.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  rsa.c: Functions for use with RSA public key cryptography.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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
 *
 *  $Id$
 */

#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, int length)
{
  static const char trans[] = "0123456789ABCDEF";
  int i;

  for (i = 0; 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;
  unsigned long length;
  int ret = -1;

  if (!rsa)
    return -1;

  get_randomness(secret, 32);
  *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);
  (*r_challenge)[length<<1] = 0;
  MyFree(tmp);

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

  return 0;
}
#endif
Revision:	2134
Committed:	Wed May 29 18:59:39 2013 UTC (12 years, 3 months ago) by michael
Content type:	text/x-csrc
File size:	2755 byte(s)
Log Message:	- s_user.c, s_serv.c, rsa.c: style corrections; mostly whitespace changes
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* rsa.c: Functions for use with RSA public key cryptography.
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22	knight	31	* $Id$
23	adx	30	*/
24
25			#include "stdinc.h"
26	michael	1307	#ifdef HAVE_LIBCRYPTO
27	adx	30	#include <openssl/pem.h>
28			#include <openssl/rand.h>
29			#include <openssl/rsa.h>
30			#include <openssl/bn.h>
31			#include <openssl/evp.h>
32			#include <openssl/err.h>
33	michael	1013	#include <openssl/opensslv.h>
34	adx	30
35			#include "memory.h"
36			#include "rsa.h"
37	michael	1309	#include "conf.h"
38			#include "log.h"
39	adx	30
40
41			/*
42			* report_crypto_errors - Dump crypto error list to log
43			*/
44			void
45			report_crypto_errors(void)
46			{
47	michael	1752	unsigned long e = 0;
48	adx	30
49	michael	1752	while ((e = ERR_get_error()))
50	michael	1247	ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
51	adx	30	}
52
53			static void
54			binary_to_hex(unsigned char bin, char hex, int length)
55			{
56			static const char trans[] = "0123456789ABCDEF";
57			int i;
58
59	michael	2134	for (i = 0; i < length; ++i)
60	adx	30	{
61	michael	2134	hex[(i << 1) ] = trans[bin[i] >> 4];
62	adx	30	hex[(i << 1) + 1] = trans[bin[i] & 0xf];
63			}
64
65			hex[i << 1] = '\0';
66			}
67
68			int
69			get_randomness(unsigned char *buf, int length)
70			{
71	michael	2134	/* Seed OpenSSL PRNG with EGD enthropy pool -kre */
72			if (ConfigFileEntry.use_egd &&
73			ConfigFileEntry.egdpool_path)
74			if (RAND_egd(ConfigFileEntry.egdpool_path) == -1)
75			return -1;
76	adx	30
77			if (RAND_status())
78	michael	2134	return RAND_bytes(buf, length);
79			/* XXX - abort? */
80			return RAND_pseudo_bytes(buf, length);
81	adx	30	}
82
83			int
84			generate_challenge(char r_challenge, char r_response, RSA *rsa)
85			{
86			unsigned char secret[32], *tmp;
87			unsigned long length;
88			int ret = -1;
89
90			if (!rsa)
91	michael	1307	return -1;
92
93	adx	30	get_randomness(secret, 32);
94			*r_response = MyMalloc(65);
95			binary_to_hex(secret, *r_response, 32);
96
97			length = RSA_size(rsa);
98			tmp = MyMalloc(length);
99			ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);
100
101			*r_challenge = MyMalloc((length << 1) + 1);
102			binary_to_hex( tmp, *r_challenge, length);
103			(*r_challenge)[length<<1] = 0;
104			MyFree(tmp);
105
106			if (ret < 0)
107			{
108			report_crypto_errors();
109			return -1;
110			}
111	michael	1307
112	adx	30	return 0;
113			}
114	michael	1307	#endif