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| 1 /* crypto/bn/bn_rand.c */ | |
| 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * This package is an SSL implementation written | |
| 6 * by Eric Young (eay@cryptsoft.com). | |
| 7 * The implementation was written so as to conform with Netscapes SSL. | |
| 8 * | |
| 9 * This library is free for commercial and non-commercial use as long as | |
| 10 * the following conditions are aheared to. The following conditions | |
| 11 * apply to all code found in this distribution, be it the RC4, RSA, | |
| 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
| 13 * included with this distribution is covered by the same copyright terms | |
| 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
| 15 * | |
| 16 * Copyright remains Eric Young's, and as such any Copyright notices in | |
| 17 * the code are not to be removed. | |
| 18 * If this package is used in a product, Eric Young should be given attribution | |
| 19 * as the author of the parts of the library used. | |
| 20 * This can be in the form of a textual message at program startup or | |
| 21 * in documentation (online or textual) provided with the package. | |
| 22 * | |
| 23 * Redistribution and use in source and binary forms, with or without | |
| 24 * modification, are permitted provided that the following conditions | |
| 25 * are met: | |
| 26 * 1. Redistributions of source code must retain the copyright | |
| 27 * notice, this list of conditions and the following disclaimer. | |
| 28 * 2. Redistributions in binary form must reproduce the above copyright | |
| 29 * notice, this list of conditions and the following disclaimer in the | |
| 30 * documentation and/or other materials provided with the distribution. | |
| 31 * 3. All advertising materials mentioning features or use of this software | |
| 32 * must display the following acknowledgement: | |
| 33 * "This product includes cryptographic software written by | |
| 34 * Eric Young (eay@cryptsoft.com)" | |
| 35 * The word 'cryptographic' can be left out if the rouines from the library | |
| 36 * being used are not cryptographic related :-). | |
| 37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
| 38 * the apps directory (application code) you must include an acknowledgement: | |
| 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
| 40 * | |
| 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
| 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 51 * SUCH DAMAGE. | |
| 52 * | |
| 53 * The licence and distribution terms for any publically available version or | |
| 54 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
| 55 * copied and put under another distribution licence | |
| 56 * [including the GNU Public Licence.] | |
| 57 */ | |
| 58 /* ==================================================================== | |
| 59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. | |
| 60 * | |
| 61 * Redistribution and use in source and binary forms, with or without | |
| 62 * modification, are permitted provided that the following conditions | |
| 63 * are met: | |
| 64 * | |
| 65 * 1. Redistributions of source code must retain the above copyright | |
| 66 * notice, this list of conditions and the following disclaimer. | |
| 67 * | |
| 68 * 2. Redistributions in binary form must reproduce the above copyright | |
| 69 * notice, this list of conditions and the following disclaimer in | |
| 70 * the documentation and/or other materials provided with the | |
| 71 * distribution. | |
| 72 * | |
| 73 * 3. All advertising materials mentioning features or use of this | |
| 74 * software must display the following acknowledgment: | |
| 75 * "This product includes software developed by the OpenSSL Project | |
| 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
| 77 * | |
| 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
| 79 * endorse or promote products derived from this software without | |
| 80 * prior written permission. For written permission, please contact | |
| 81 * openssl-core@openssl.org. | |
| 82 * | |
| 83 * 5. Products derived from this software may not be called "OpenSSL" | |
| 84 * nor may "OpenSSL" appear in their names without prior written | |
| 85 * permission of the OpenSSL Project. | |
| 86 * | |
| 87 * 6. Redistributions of any form whatsoever must retain the following | |
| 88 * acknowledgment: | |
| 89 * "This product includes software developed by the OpenSSL Project | |
| 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
| 91 * | |
| 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
| 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
| 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 103 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 104 * ==================================================================== | |
| 105 * | |
| 106 * This product includes cryptographic software written by Eric Young | |
| 107 * (eay@cryptsoft.com). This product includes software written by Tim | |
| 108 * Hudson (tjh@cryptsoft.com). | |
| 109 * | |
| 110 */ | |
| 111 | |
| 112 #include <stdio.h> | |
| 113 #include <time.h> | |
| 114 #include "cryptlib.h" | |
| 115 #include "bn_lcl.h" | |
| 116 #include <openssl/rand.h> | |
| 117 | |
| 118 static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) | |
| 119 { | |
| 120 unsigned char *buf=NULL; | |
| 121 int ret=0,bit,bytes,mask; | |
| 122 time_t tim; | |
| 123 | |
| 124 if (bits == 0) | |
| 125 { | |
| 126 BN_zero(rnd); | |
| 127 return 1; | |
| 128 } | |
| 129 | |
| 130 bytes=(bits+7)/8; | |
| 131 bit=(bits-1)%8; | |
| 132 mask=0xff<<(bit+1); | |
| 133 | |
| 134 buf=(unsigned char *)OPENSSL_malloc(bytes); | |
| 135 if (buf == NULL) | |
| 136 { | |
| 137 BNerr(BN_F_BNRAND,ERR_R_MALLOC_FAILURE); | |
| 138 goto err; | |
| 139 } | |
| 140 | |
| 141 /* make a random number and set the top and bottom bits */ | |
| 142 time(&tim); | |
| 143 RAND_add(&tim,sizeof(tim),0.0); | |
| 144 | |
| 145 if (pseudorand) | |
| 146 { | |
| 147 if (RAND_pseudo_bytes(buf, bytes) == -1) | |
| 148 goto err; | |
| 149 } | |
| 150 else | |
| 151 { | |
| 152 if (RAND_bytes(buf, bytes) <= 0) | |
| 153 goto err; | |
| 154 } | |
| 155 | |
| 156 #if 1 | |
| 157 if (pseudorand == 2) | |
| 158 { | |
| 159 /* generate patterns that are more likely to trigger BN | |
| 160 library bugs */ | |
| 161 int i; | |
| 162 unsigned char c; | |
| 163 | |
| 164 for (i = 0; i < bytes; i++) | |
| 165 { | |
| 166 RAND_pseudo_bytes(&c, 1); | |
| 167 if (c >= 128 && i > 0) | |
| 168 buf[i] = buf[i-1]; | |
| 169 else if (c < 42) | |
| 170 buf[i] = 0; | |
| 171 else if (c < 84) | |
| 172 buf[i] = 255; | |
| 173 } | |
| 174 } | |
| 175 #endif | |
| 176 | |
| 177 if (top != -1) | |
| 178 { | |
| 179 if (top) | |
| 180 { | |
| 181 if (bit == 0) | |
| 182 { | |
| 183 buf[0]=1; | |
| 184 buf[1]|=0x80; | |
| 185 } | |
| 186 else | |
| 187 { | |
| 188 buf[0]|=(3<<(bit-1)); | |
| 189 } | |
| 190 } | |
| 191 else | |
| 192 { | |
| 193 buf[0]|=(1<<bit); | |
| 194 } | |
| 195 } | |
| 196 buf[0] &= ~mask; | |
| 197 if (bottom) /* set bottom bit if requested */ | |
| 198 buf[bytes-1]|=1; | |
| 199 if (!BN_bin2bn(buf,bytes,rnd)) goto err; | |
| 200 ret=1; | |
| 201 err: | |
| 202 if (buf != NULL) | |
| 203 { | |
| 204 OPENSSL_cleanse(buf,bytes); | |
| 205 OPENSSL_free(buf); | |
| 206 } | |
| 207 bn_check_top(rnd); | |
| 208 return(ret); | |
| 209 } | |
| 210 | |
| 211 int BN_rand(BIGNUM *rnd, int bits, int top, int bottom) | |
| 212 { | |
| 213 return bnrand(0, rnd, bits, top, bottom); | |
| 214 } | |
| 215 | |
| 216 int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom) | |
| 217 { | |
| 218 return bnrand(1, rnd, bits, top, bottom); | |
| 219 } | |
| 220 | |
| 221 #if 1 | |
| 222 int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom) | |
| 223 { | |
| 224 return bnrand(2, rnd, bits, top, bottom); | |
| 225 } | |
| 226 #endif | |
| 227 | |
| 228 | |
| 229 /* random number r: 0 <= r < range */ | |
| 230 static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) | |
| 231 { | |
| 232 int (*bn_rand)(BIGNUM *, int, int, int) = pseudo ? BN_pseudo_rand : BN_r
and; | |
| 233 int n; | |
| 234 int count = 100; | |
| 235 | |
| 236 if (range->neg || BN_is_zero(range)) | |
| 237 { | |
| 238 BNerr(BN_F_BN_RAND_RANGE, BN_R_INVALID_RANGE); | |
| 239 return 0; | |
| 240 } | |
| 241 | |
| 242 n = BN_num_bits(range); /* n > 0 */ | |
| 243 | |
| 244 /* BN_is_bit_set(range, n - 1) always holds */ | |
| 245 | |
| 246 if (n == 1) | |
| 247 BN_zero(r); | |
| 248 else if (!BN_is_bit_set(range, n - 2) && !BN_is_bit_set(range, n - 3)) | |
| 249 { | |
| 250 /* range = 100..._2, | |
| 251 * so 3*range (= 11..._2) is exactly one bit longer than rang
e */ | |
| 252 do | |
| 253 { | |
| 254 if (!bn_rand(r, n + 1, -1, 0)) return 0; | |
| 255 /* If r < 3*range, use r := r MOD range | |
| 256 * (which is either r, r - range, or r - 2*range). | |
| 257 * Otherwise, iterate once more. | |
| 258 * Since 3*range = 11..._2, each iteration succeeds wit
h | |
| 259 * probability >= .75. */ | |
| 260 if (BN_cmp(r ,range) >= 0) | |
| 261 { | |
| 262 if (!BN_sub(r, r, range)) return 0; | |
| 263 if (BN_cmp(r, range) >= 0) | |
| 264 if (!BN_sub(r, r, range)) return 0; | |
| 265 } | |
| 266 | |
| 267 if (!--count) | |
| 268 { | |
| 269 BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIO
NS); | |
| 270 return 0; | |
| 271 } | |
| 272 | |
| 273 } | |
| 274 while (BN_cmp(r, range) >= 0); | |
| 275 } | |
| 276 else | |
| 277 { | |
| 278 do | |
| 279 { | |
| 280 /* range = 11..._2 or range = 101..._2 */ | |
| 281 if (!bn_rand(r, n, -1, 0)) return 0; | |
| 282 | |
| 283 if (!--count) | |
| 284 { | |
| 285 BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIO
NS); | |
| 286 return 0; | |
| 287 } | |
| 288 } | |
| 289 while (BN_cmp(r, range) >= 0); | |
| 290 } | |
| 291 | |
| 292 bn_check_top(r); | |
| 293 return 1; | |
| 294 } | |
| 295 | |
| 296 | |
| 297 int BN_rand_range(BIGNUM *r, const BIGNUM *range) | |
| 298 { | |
| 299 return bn_rand_range(0, r, range); | |
| 300 } | |
| 301 | |
| 302 int BN_pseudo_rand_range(BIGNUM *r, const BIGNUM *range) | |
| 303 { | |
| 304 return bn_rand_range(1, r, range); | |
| 305 } | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master