/*
-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-openssl.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 openssl (http://www.openssl.org), which is
+ * under the OpenSSL License. You may have to abide to its terms too if you use
+ * this file.
+ * To alternatively link to GMP, provide the option --without-openssl to
+ * ./configure.
+ */
#include "d0_bignum.h"
#include <assert.h>
#include <string.h>
#include <openssl/bn.h>
+#include <openssl/crypto.h>
+
+// for stupid OpenSSL versions in Mac OS X
+#ifndef BN_is_negative
+#define BN_is_negative(a) ((a)->neg != 0)
+#define BN_set_negative(a,n) ((a)->neg = ((n) && !BN_is_zero(a)))
+#endif
struct d0_bignum_s
{
static d0_bignum_t temp;
static BN_CTX *ctx;
+static unsigned char numbuf[65536];
+static void *tempmutex = NULL; // hold this mutex when using ctx or temp or numbuf
#include <time.h>
#include <stdio.h>
-WARN_UNUSED_RESULT BOOL d0_bignum_INITIALIZE(void)
+static void **locks;
+
+void locking_function(int mode, int l, const char *file, int line)
+{
+ void *m = locks[l];
+ if(mode & CRYPTO_LOCK)
+ d0_lockmutex(m);
+ else
+ d0_unlockmutex(m);
+}
+
+typedef struct CRYPTO_dynlock_value
+{
+ void *m;
+};
+
+struct CRYPTO_dynlock_value *dyn_create_function(const char *file, int line)
+{
+ return (struct CRYPTO_dynlock_value *) d0_createmutex();
+}
+
+void dyn_lock_function(int mode, struct CRYPTO_dynlock_value *l, const char *file, int line)
{
+ void *m = (void *) l;
+ if(mode & CRYPTO_LOCK)
+ d0_lockmutex(m);
+ else
+ d0_unlockmutex(m);
+}
+
+void dyn_destroy_function(struct CRYPTO_dynlock_value *l, const char *file, int line)
+{
+ void *m = (void *) l;
+ d0_destroymutex(l);
+}
+
+D0_WARN_UNUSED_RESULT D0_BOOL d0_bignum_INITIALIZE(void)
+{
+ FILE *f;
+ D0_BOOL ret = 1;
+ unsigned char buf[256];
+ int i, n;
+
+ tempmutex = d0_createmutex();
+ d0_lockmutex(tempmutex);
+
+ n = CRYPTO_num_locks();
+ locks = d0_malloc(n * sizeof(*locks));
+ for(i = 0; i < n; ++i)
+ locks[i] = d0_createmutex();
+
+ CRYPTO_set_locking_callback(locking_function);
+ CRYPTO_set_dynlock_create_callback(dyn_create_function);
+ CRYPTO_set_dynlock_lock_callback(dyn_lock_function);
+ CRYPTO_set_dynlock_destroy_callback(dyn_destroy_function);
+
ctx = BN_CTX_new();
d0_bignum_init(&temp);
+
+#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)
+ {
+ setbuf(f, NULL);
+ if(fread(buf, sizeof(buf), 1, f) != 1)
+ {
+ 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
+ RAND_add(buf, sizeof(buf), sizeof(buf));
+
+ d0_unlockmutex(tempmutex);
+
return 1;
+ // FIXME initialize the RNG on Windows on UNIX it is done right already
}
void d0_bignum_SHUTDOWN(void)
{
+ int i, n;
+
+ d0_lockmutex(tempmutex);
+
d0_bignum_clear(&temp);
BN_CTX_free(ctx);
ctx = NULL;
+
+ n = CRYPTO_num_locks();
+ for(i = 0; i < n; ++i)
+ d0_destroymutex(locks[i]);
+ d0_free(locks);
+
+ d0_unlockmutex(tempmutex);
+ d0_destroymutex(tempmutex);
+ tempmutex = NULL;
}
-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];
+ D0_BOOL ret;
size_t count = 0;
+
+ d0_lockmutex(tempmutex);
numbuf[0] = BN_is_zero(&bignum->z) ? 0 : BN_is_negative(&bignum->z) ? 3 : 1;
if((numbuf[0] & 3) != 0) // nonzero
{
count = BN_num_bytes(&bignum->z);
if(count > sizeof(numbuf) - 1)
+ {
+ d0_unlockmutex(tempmutex);
return 0;
+ }
BN_bn2bin(&bignum->z, numbuf+1);
}
- return d0_iobuf_write_packet(buf, numbuf, count + 1);
+ ret = d0_iobuf_write_packet(buf, numbuf, count + 1);
+ d0_unlockmutex(tempmutex);
+ return ret;
}
d0_bignum_t *d0_iobuf_read_bignum(d0_iobuf_t *buf, d0_bignum_t *bignum)
{
- static unsigned char numbuf[65536];
size_t count = sizeof(numbuf);
+
+ d0_lockmutex(tempmutex);
if(!d0_iobuf_read_packet(buf, numbuf, &count))
+ {
+ d0_unlockmutex(tempmutex);
return NULL;
+ }
if(count < 1)
+ {
+ d0_unlockmutex(tempmutex);
return NULL;
- if(!bignum) bignum = d0_bignum_new(); if(!bignum) return NULL;
+ }
+ if(!bignum)
+ bignum = d0_bignum_new();
+ if(!bignum)
+ {
+ d0_unlockmutex(tempmutex);
+ return NULL;
+ }
if(numbuf[0] & 3) // nonzero
{
BN_bin2bn(numbuf+1, count-1, &bignum->z);
{
BN_zero(&bignum->z);
}
+ d0_unlockmutex(tempmutex);
return bignum;
}
d0_bignum_t *d0_bignum_rand_range(d0_bignum_t *r, const d0_bignum_t *min, const d0_bignum_t *max)
{
if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
BN_sub(&temp.z, &max->z, &min->z);
BN_rand_range(&r->z, &temp.z);
+ d0_unlockmutex(tempmutex);
BN_add(&r->z, &r->z, &min->z);
return r;
}
if(n > 0)
BN_lshift(&r->z, &a->z, n);
else if(n < 0)
- BN_rshift(&r->z, &a->z, n);
+ BN_rshift(&r->z, &a->z, -n);
else if(r != a)
BN_copy(&r->z, &a->z);
return r;
d0_bignum_t *d0_bignum_mul(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b)
{
if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
BN_mul(&r->z, &a->z, &b->z, ctx);
+ d0_unlockmutex(tempmutex);
return r;
}
{
if(!q && !m)
m = d0_bignum_new();
+ d0_lockmutex(tempmutex);
if(q)
{
if(m)
assert(!"I know this code is broken (rounds towards zero), need handle negative correctly");
}
else
- BN_nnmod(&q->z, &a->z, &b->z, ctx);
+ BN_nnmod(&m->z, &a->z, &b->z, ctx);
+ d0_unlockmutex(tempmutex);
if(m)
return m;
else
d0_bignum_t *d0_bignum_mod_add(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
{
if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
BN_mod_add(&r->z, &a->z, &b->z, &m->z, ctx);
+ d0_unlockmutex(tempmutex);
+ 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)
+{
+ if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
+ BN_mod_sub(&r->z, &a->z, &b->z, &m->z, ctx);
+ d0_unlockmutex(tempmutex);
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)
{
if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
BN_mod_mul(&r->z, &a->z, &b->z, &m->z, ctx);
+ d0_unlockmutex(tempmutex);
return r;
}
d0_bignum_t *d0_bignum_mod_pow(d0_bignum_t *r, const d0_bignum_t *a, const d0_bignum_t *b, const d0_bignum_t *m)
{
if(!r) r = d0_bignum_new(); if(!r) return NULL;
+ d0_lockmutex(tempmutex);
BN_mod_exp(&r->z, &a->z, &b->z, &m->z, ctx);
+ d0_unlockmutex(tempmutex);
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 !!BN_mod_inverse(&r->z, &a->z, &m->z, ctx);
+ int ret;
+ d0_lockmutex(tempmutex);
+ ret = !!BN_mod_inverse(&r->z, &a->z, &m->z, ctx);
+ d0_unlockmutex(tempmutex);
+ return ret;
}
-int d0_bignum_isprime(d0_bignum_t *r, int param)
+int d0_bignum_isprime(const d0_bignum_t *r, int param)
{
- return BN_is_prime(&r->z, param, NULL, ctx, NULL);
+ int ret;
+ d0_lockmutex(tempmutex);
+ if(param <= 0)
+ ret = BN_is_prime_fasttest(&r->z, 1, NULL, ctx, NULL, 1);
+ else
+ ret = BN_is_prime(&r->z, param, NULL, ctx, NULL);
+ d0_unlockmutex(tempmutex);
+ return ret;
}
d0_bignum_t *d0_bignum_gcd(d0_bignum_t *r, d0_bignum_t *s, d0_bignum_t *t, const d0_bignum_t *a, const d0_bignum_t *b)
else if(t)
assert(!"Extended gcd not implemented");
else
+ {
+ d0_lockmutex(tempmutex);
BN_gcd(&r->z, &a->z, &b->z, ctx);
+ d0_unlockmutex(tempmutex);
+ }
return r;
}
char *d0_bignum_tostring(const d0_bignum_t *x, unsigned int base)
{
+ char *s = NULL;
+ char *s2;
+ size_t n;
if(base == 10)
- return BN_bn2dec(&x->z);
+ s = BN_bn2dec(&x->z);
else if(base == 16)
- return BN_bn2hex(&x->z);
+ s = BN_bn2hex(&x->z);
else
assert(!"Other bases not implemented");
+ n = strlen(s) + 1;
+ s2 = d0_malloc(n);
+ memcpy(s2, s, n);
+ OPENSSL_free(s);
+ return s2;
}
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