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/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* rsa.c: Functions for use with RSA public key cryptography. |
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* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#ifdef HAVE_LIBCRYPTO |
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#include <openssl/pem.h> |
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#include <openssl/rand.h> |
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#include <openssl/rsa.h> |
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#include <openssl/bn.h> |
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#include <openssl/evp.h> |
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#include <openssl/err.h> |
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#include <openssl/opensslv.h> |
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|
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#include "memory.h" |
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#include "rsa.h" |
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#include "conf.h" |
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#include "log.h" |
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|
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|
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/* |
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* report_crypto_errors - Dump crypto error list to log |
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*/ |
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void |
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report_crypto_errors(void) |
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{ |
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unsigned long e = 0; |
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unsigned long cnt = 0; |
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|
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while ((cnt < 100) && (e = ERR_get_error())) |
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{ |
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ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0)); |
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cnt++; |
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} |
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} |
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|
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static void |
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binary_to_hex(unsigned char *bin, char *hex, int length) |
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{ |
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static const char trans[] = "0123456789ABCDEF"; |
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int i; |
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|
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for (i = 0; i < length; i++) |
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{ |
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hex[i << 1] = trans[bin[i] >> 4]; |
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hex[(i << 1) + 1] = trans[bin[i] & 0xf]; |
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} |
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|
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hex[i << 1] = '\0'; |
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} |
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|
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int |
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get_randomness(unsigned char *buf, int length) |
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{ |
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/* Seed OpenSSL PRNG with EGD enthropy pool -kre */ |
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if (ConfigFileEntry.use_egd && |
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(ConfigFileEntry.egdpool_path != NULL)) |
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{ |
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if (RAND_egd(ConfigFileEntry.egdpool_path) == -1) |
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return -1; |
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} |
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|
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if (RAND_status()) |
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return (RAND_bytes(buf, length)); |
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else /* XXX - abort? */ |
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return (RAND_pseudo_bytes(buf, length)); |
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} |
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|
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int |
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generate_challenge(char **r_challenge, char **r_response, RSA *rsa) |
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{ |
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unsigned char secret[32], *tmp; |
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unsigned long length; |
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int ret = -1; |
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|
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if (!rsa) |
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return -1; |
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|
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get_randomness(secret, 32); |
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*r_response = MyMalloc(65); |
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binary_to_hex(secret, *r_response, 32); |
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|
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length = RSA_size(rsa); |
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tmp = MyMalloc(length); |
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ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING); |
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|
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*r_challenge = MyMalloc((length << 1) + 1); |
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binary_to_hex( tmp, *r_challenge, length); |
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(*r_challenge)[length<<1] = 0; |
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MyFree(tmp); |
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|
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if (ret < 0) |
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{ |
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report_crypto_errors(); |
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return -1; |
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} |
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|
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return 0; |
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} |
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#endif |
