/*
-Blind-ID library for user identification using RSA blind signatures
-Copyright (C) 2010 Rudolf Polzer
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
-
-This library 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
-Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public
-License along with this library; if not, write to the Free Software
-Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-*/
+ * FILE: d0_bignum-gmp.c
+ * AUTHOR: Rudolf Polzer - divVerent@xonotic.org
+ *
+ * Copyright (c) 2010, Rudolf Polzer
+ * 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 copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``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 AUTHOR OR CONTRIBUTOR(S) 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.
+ *
+ * $Format:commit %H$
+ * $Id$
+ */
+
+/* NOTE: this file links against libgmp (http://gmplib.org), which is under the
+ * Lesser General Public License 2.1 or later. You may have to abide to its
+ * terms too if you use this file.
+ * To alternatively link to OpenSSL, provide the option --with-openssl to
+ * ./configure.
+ */
+
+#ifdef WIN32
+#include <windows.h>
+#include <wincrypt.h>
+#endif
#include "d0_bignum.h"
#include <gmp.h>
+#include <string.h>
+#include <stdlib.h>
struct d0_bignum_s
{
#include <time.h>
#include <stdio.h>
-void d0_bignum_INITIALIZE()
+
+D0_WARN_UNUSED_RESULT D0_BOOL d0_bignum_INITIALIZE(void)
{
FILE *f;
+ D0_BOOL ret = 1;
+ unsigned char buf[256];
d0_bignum_init(&temp);
gmp_randinit_mt(RANDSTATE);
gmp_randseed_ui(RANDSTATE, time(NULL));
- f = fopen("/dev/random", "rb");
+ * (time_t *) (&buf[0]) = time(0); // if everything else fails, we use the current time + uninitialized data
+#ifdef WIN32
+ {
+ HCRYPTPROV hCryptProv;
+ if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+ {
+ if(!CryptGenRandom(hCryptProv, sizeof(buf), (PBYTE) &buf[0]))
+ {
+ fprintf(stderr, "WARNING: could not initialize random number generator (CryptGenRandom failed)\n");
+ ret = 0;
+ }
+ CryptReleaseContext(hCryptProv, 0);
+ }
+ else if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_NEWKEYSET))
+ {
+ if(!CryptGenRandom(hCryptProv, sizeof(buf), (PBYTE) &buf[0]))
+ {
+ fprintf(stderr, "WARNING: could not initialize random number generator (CryptGenRandom failed)\n");
+ ret = 0;
+ }
+ CryptReleaseContext(hCryptProv, 0);
+ }
+ else
+ {
+ fprintf(stderr, "WARNING: could not initialize random number generator (CryptAcquireContext failed)\n");
+ ret = 0;
+ }
+ }
+#else
+ f = fopen("/dev/urandom", "rb");
+ if(!f)
+ f = fopen("/dev/random", "rb");
if(f)
{
- unsigned char buf[256];
- if(fread(buf, sizeof(buf), 1, f) == 1)
+ setbuf(f, NULL);
+ if(fread(buf, sizeof(buf), 1, f) != 1)
{
- mpz_import(temp.z, sizeof(buf), 1, 1, 0, 0, buf);
- gmp_randseed(RANDSTATE, temp.z);
+ fprintf(stderr, "WARNING: could not initialize random number generator (read from random device failed)\n");
+ ret = 0;
}
fclose(f);
}
+ else
+ {
+ fprintf(stderr, "WARNING: could not initialize random number generator (no random device found)\n");
+ ret = 0;
+ }
+#endif
+
+ mpz_import(temp.z, sizeof(buf), 1, 1, 0, 0, buf);
+ gmp_randseed(RANDSTATE, temp.z);
+
+ return ret;
}
-void d0_bignum_SHUTDOWN()
+void d0_bignum_SHUTDOWN(void)
{
d0_bignum_clear(&temp);
gmp_randclear(RANDSTATE);
}
-BOOL d0_iobuf_write_bignum(d0_iobuf_t *buf, const d0_bignum_t *bignum)
+D0_BOOL d0_iobuf_write_bignum(d0_iobuf_t *buf, const d0_bignum_t *bignum)
{
static unsigned char numbuf[65536];
size_t count = 0;
return bignum;
}
-d0_bignum_t *d0_bignum_new()
+ssize_t d0_bignum_export_unsigned(const d0_bignum_t *bignum, void *buf, size_t bufsize)
+{
+ size_t count;
+ count = (mpz_sizeinbase(bignum->z, 2) + 7) / 8;
+ if(count > bufsize)
+ return -1;
+ if(bufsize > count)
+ {
+ // pad from left (big endian numbers!)
+ memset(buf, 0, bufsize - count);
+ buf += bufsize - count;
+ }
+ bufsize = count;
+ mpz_export(buf, &bufsize, 1, 1, 0, 0, bignum->z);
+ if(bufsize > count)
+ {
+ // REALLY BAD
+ // mpz_sizeinbase lied to us
+ // buffer overflow
+ // there is no sane way whatsoever to handle this
+ abort();
+ }
+ if(bufsize < count)
+ {
+ // BAD
+ // mpz_sizeinbase lied to us
+ // move the number
+ if(bufsize == 0)
+ {
+ memset(buf, 0, count);
+ }
+ else
+ {
+ memmove(buf + count - bufsize, buf, bufsize);
+ memset(buf, 0, count - bufsize);
+ }
+ }
+ return bufsize;
+}
+
+d0_bignum_t *d0_bignum_import_unsigned(d0_bignum_t *bignum, const void *buf, size_t bufsize)
+{
+ size_t count;
+ if(!bignum) bignum = d0_bignum_new(); if(!bignum) return NULL;
+ mpz_import(bignum->z, bufsize, 1, 1, 0, 0, buf);
+ return bignum;
+}
+
+d0_bignum_t *d0_bignum_new(void)
{
d0_bignum_t *b = d0_malloc(sizeof(d0_bignum_t));
mpz_init(b->z);
return r;
}
+d0_bignum_t *d0_bignum_mod_sub(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
+{
+ r = d0_bignum_sub(r, a, b);
+ mpz_fdiv_r(r->z, r->z, m->z);
+ return r;
+}
+
d0_bignum_t *d0_bignum_mod_mul(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
{
r = d0_bignum_mul(r, a, b);
return r;
}
-BOOL d0_bignum_mod_inv(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *m)
+D0_BOOL d0_bignum_mod_inv(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *m)
{
// here, r MUST be set, as otherwise we cannot return error state!
return mpz_invert(r->z, a->z, m->z);
projects / xonotic / d0_blind_id.git / blobdiff