+++ /dev/null
-/* crypto/bn/bn_rand.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 CONTRIBUTORS 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-#include <stdio.h>
-#include <time.h>
-#include "cryptlib.h"
-#include "bn_lcl.h"
-#include <openssl/rand.h>
-
-static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom)
- {
- unsigned char *buf=NULL;
- int ret=0,bit,bytes,mask;
- time_t tim;
-
- if (bits == 0)
- {
- BN_zero(rnd);
- return 1;
- }
-
- bytes=(bits+7)/8;
- bit=(bits-1)%8;
- mask=0xff<<(bit+1);
-
- buf=(unsigned char *)Malloc(bytes);
- if (buf == NULL)
- {
- BNerr(BN_F_BN_RAND,ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- /* make a random number and set the top and bottom bits */
- time(&tim);
- RAND_add(&tim,sizeof(tim),0);
-
- if (pseudorand)
- {
- if (RAND_pseudo_bytes(buf, bytes) == -1)
- goto err;
- }
- else
- {
- if (RAND_bytes(buf, bytes) <= 0)
- goto err;
- }
-
-#if 1
- if (pseudorand == 2)
- {
- /* generate patterns that are more likely to trigger BN
- library bugs */
- int i;
- unsigned char c;
-
- for (i = 0; i < bytes; i++)
- {
- RAND_pseudo_bytes(&c, 1);
- if (c >= 128 && i > 0)
- buf[i] = buf[i-1];
- else if (c < 42)
- buf[i] = 0;
- else if (c < 84)
- buf[i] = 255;
- }
- }
-#endif
-
- if (top != -1)
- {
- if (top)
- {
- if (bit == 0)
- {
- buf[0]=1;
- buf[1]|=0x80;
- }
- else
- {
- buf[0]|=(3<<(bit-1));
- }
- }
- else
- {
- buf[0]|=(1<<bit);
- }
- }
- buf[0] &= ~mask;
- if (bottom) /* set bottom bit if requested */
- buf[bytes-1]|=1;
- if (!BN_bin2bn(buf,bytes,rnd)) goto err;
- ret=1;
-err:
- if (buf != NULL)
- {
- memset(buf,0,bytes);
- Free(buf);
- }
- return(ret);
- }
-
-int BN_rand(BIGNUM *rnd, int bits, int top, int bottom)
- {
- return bnrand(0, rnd, bits, top, bottom);
- }
-
-int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom)
- {
- return bnrand(1, rnd, bits, top, bottom);
- }
-
-#if 0
-int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom)
- {
- return bnrand(2, rnd, bits, top, bottom);
- }
-#endif
-
-/* random number r: 0 <= r < range */
-int BN_rand_range(BIGNUM *r, BIGNUM *range)
- {
- int n;
-
- if (range->neg || BN_is_zero(range))
- {
- BNerr(BN_F_BN_RAND_RANGE, BN_R_INVALID_RANGE);
- return 0;
- }
-
- n = BN_num_bits(range); /* n > 0 */
-
- if (n == 1)
- {
- if (!BN_zero(r)) return 0;
- }
- else if (BN_is_bit_set(range, n - 2))
- {
- do
- {
- /* range = 11..._2, so each iteration succeeds with probability >= .75 */
- if (!BN_rand(r, n, -1, 0)) return 0;
- }
- while (BN_cmp(r, range) >= 0);
- }
- else
- {
- /* range = 10..._2,
- * so 3*range (= 11..._2) is exactly one bit longer than range */
- do
- {
- if (!BN_rand(r, n + 1, -1, 0)) return 0;
- /* If r < 3*range, use r := r MOD range
- * (which is either r, r - range, or r - 2*range).
- * Otherwise, iterate once more.
- * Since 3*range = 11..._2, each iteration succeeds with
- * probability >= .75. */
- if (BN_cmp(r ,range) >= 0)
- {
- if (!BN_sub(r, r, range)) return 0;
- if (BN_cmp(r, range) >= 0)
- if (!BN_sub(r, r, range)) return 0;
- }
- }
- while (BN_cmp(r, range) >= 0);
- }
-
- return 1;
- }
projects / apple / security.git / blobdiff