diff options
Diffstat (limited to '')
| -rw-r--r-- | freebsd/crypto/openssl/crypto/bn/bn_rand.c | 264 |
1 files changed, 119 insertions, 145 deletions
diff --git a/freebsd/crypto/openssl/crypto/bn/bn_rand.c b/freebsd/crypto/openssl/crypto/bn/bn_rand.c index 42dc239c..68ded7c3 100644 --- a/freebsd/crypto/openssl/crypto/bn/bn_rand.c +++ b/freebsd/crypto/openssl/crypto/bn/bn_rand.c @@ -1,130 +1,32 @@ #include <machine/rtems-bsd-user-space.h> -/* 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.] - */ -/* ==================================================================== - * Copyright (c) 1998-2001 The OpenSSL Project. 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. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * openssl-core@openssl.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.openssl.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED 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 OpenSSL PROJECT OR - * ITS 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. - * ==================================================================== - * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). +/* + * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include <stdio.h> #include <time.h> -#include "cryptlib.h" +#include "internal/cryptlib.h" #include "bn_lcl.h" #include <openssl/rand.h> +#include <openssl/sha.h> -static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) +typedef enum bnrand_flag_e { + NORMAL, TESTING, PRIVATE +} BNRAND_FLAG; + +static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom) { unsigned char *buf = NULL; - int ret = 0, bit, bytes, mask; - time_t tim; + int b, ret = 0, bit, bytes, mask; if (bits == 0) { - if (top != -1 || bottom != 0) + if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY) goto toosmall; BN_zero(rnd); return 1; @@ -136,22 +38,18 @@ static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) bit = (bits - 1) % 8; mask = 0xff << (bit + 1); - buf = (unsigned char *)OPENSSL_malloc(bytes); + buf = OPENSSL_malloc(bytes); if (buf == NULL) { BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE); goto err; } /* make a random number and set the top and bottom bits */ - time(&tim); - RAND_add(&tim, sizeof(tim), 0.0); - - /* We ignore the value of pseudorand and always call RAND_bytes */ - if (RAND_bytes(buf, bytes) <= 0) + b = flag == NORMAL ? RAND_bytes(buf, bytes) : RAND_priv_bytes(buf, bytes); + if (b <= 0) goto err; -#if 1 - if (pseudorand == 2) { + if (flag == TESTING) { /* * generate patterns that are more likely to trigger BN library bugs */ @@ -159,7 +57,7 @@ static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) unsigned char c; for (i = 0; i < bytes; i++) { - if (RAND_pseudo_bytes(&c, 1) < 0) + if (RAND_bytes(&c, 1) <= 0) goto err; if (c >= 128 && i > 0) buf[i] = buf[i - 1]; @@ -169,7 +67,6 @@ static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) buf[i] = 255; } } -#endif if (top >= 0) { if (top) { @@ -190,12 +87,9 @@ static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom) goto err; ret = 1; err: - if (buf != NULL) { - OPENSSL_cleanse(buf, bytes); - OPENSSL_free(buf); - } + OPENSSL_clear_free(buf, bytes); bn_check_top(rnd); - return (ret); + return ret; toosmall: BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL); @@ -204,31 +98,27 @@ toosmall: int BN_rand(BIGNUM *rnd, int bits, int top, int bottom) { - return bnrand(0, rnd, bits, top, bottom); + return bnrand(NORMAL, rnd, bits, top, bottom); } -int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom) +int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom) { - return bnrand(1, rnd, bits, top, bottom); + return bnrand(TESTING, rnd, bits, top, bottom); } -#if 1 -int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom) +int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom) { - return bnrand(2, rnd, bits, top, bottom); + return bnrand(PRIVATE, rnd, bits, top, bottom); } -#endif /* random number r: 0 <= r < range */ -static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) +static int bnrand_range(BNRAND_FLAG flag, BIGNUM *r, const BIGNUM *range) { - int (*bn_rand) (BIGNUM *, int, int, int) = - pseudo ? BN_pseudo_rand : BN_rand; int n; int count = 100; if (range->neg || BN_is_zero(range)) { - BNerr(BN_F_BN_RAND_RANGE, BN_R_INVALID_RANGE); + BNerr(BN_F_BNRAND_RANGE, BN_R_INVALID_RANGE); return 0; } @@ -244,8 +134,9 @@ static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) * than range */ do { - if (!bn_rand(r, n + 1, -1, 0)) + if (!bnrand(flag, r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY)) 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 @@ -261,7 +152,7 @@ static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) } if (!--count) { - BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIONS); + BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS); return 0; } @@ -270,11 +161,11 @@ static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) } else { do { /* range = 11..._2 or range = 101..._2 */ - if (!bn_rand(r, n, -1, 0)) + if (!bnrand(flag, r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY)) return 0; if (!--count) { - BNerr(BN_F_BN_RAND_RANGE, BN_R_TOO_MANY_ITERATIONS); + BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS); return 0; } } @@ -287,10 +178,93 @@ static int bn_rand_range(int pseudo, BIGNUM *r, const BIGNUM *range) int BN_rand_range(BIGNUM *r, const BIGNUM *range) { - return bn_rand_range(0, r, range); + return bnrand_range(NORMAL, r, range); +} + +int BN_priv_rand_range(BIGNUM *r, const BIGNUM *range) +{ + return bnrand_range(PRIVATE, r, range); +} + +int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom) +{ + return BN_rand(rnd, bits, top, bottom); } int BN_pseudo_rand_range(BIGNUM *r, const BIGNUM *range) { - return bn_rand_range(1, r, range); + return BN_rand_range(r, range); +} + +/* + * BN_generate_dsa_nonce generates a random number 0 <= out < range. Unlike + * BN_rand_range, it also includes the contents of |priv| and |message| in + * the generation so that an RNG failure isn't fatal as long as |priv| + * remains secret. This is intended for use in DSA and ECDSA where an RNG + * weakness leads directly to private key exposure unless this function is + * used. + */ +int BN_generate_dsa_nonce(BIGNUM *out, const BIGNUM *range, + const BIGNUM *priv, const unsigned char *message, + size_t message_len, BN_CTX *ctx) +{ + SHA512_CTX sha; + /* + * We use 512 bits of random data per iteration to ensure that we have at + * least |range| bits of randomness. + */ + unsigned char random_bytes[64]; + unsigned char digest[SHA512_DIGEST_LENGTH]; + unsigned done, todo; + /* We generate |range|+8 bytes of random output. */ + const unsigned num_k_bytes = BN_num_bytes(range) + 8; + unsigned char private_bytes[96]; + unsigned char *k_bytes; + int ret = 0; + + k_bytes = OPENSSL_malloc(num_k_bytes); + if (k_bytes == NULL) + goto err; + + /* We copy |priv| into a local buffer to avoid exposing its length. */ + todo = sizeof(priv->d[0]) * priv->top; + if (todo > sizeof(private_bytes)) { + /* + * No reasonable DSA or ECDSA key should have a private key this + * large and we don't handle this case in order to avoid leaking the + * length of the private key. + */ + BNerr(BN_F_BN_GENERATE_DSA_NONCE, BN_R_PRIVATE_KEY_TOO_LARGE); + goto err; + } + memcpy(private_bytes, priv->d, todo); + memset(private_bytes + todo, 0, sizeof(private_bytes) - todo); + + for (done = 0; done < num_k_bytes;) { + if (RAND_priv_bytes(random_bytes, sizeof(random_bytes)) != 1) + goto err; + SHA512_Init(&sha); + SHA512_Update(&sha, &done, sizeof(done)); + SHA512_Update(&sha, private_bytes, sizeof(private_bytes)); + SHA512_Update(&sha, message, message_len); + SHA512_Update(&sha, random_bytes, sizeof(random_bytes)); + SHA512_Final(digest, &sha); + + todo = num_k_bytes - done; + if (todo > SHA512_DIGEST_LENGTH) + todo = SHA512_DIGEST_LENGTH; + memcpy(k_bytes + done, digest, todo); + done += todo; + } + + if (!BN_bin2bn(k_bytes, num_k_bytes, out)) + goto err; + if (BN_mod(out, out, range, ctx) != 1) + goto err; + ret = 1; + + err: + OPENSSL_free(k_bytes); + OPENSSL_cleanse(private_bytes, sizeof(private_bytes)); + return ret; } |