299 lines
8.3 KiB
C
299 lines
8.3 KiB
C
/* crypto/rand/rand_lib.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <time.h>
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#include "cryptlib.h"
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#include <openssl/rand.h>
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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#ifdef OPENSSL_FIPS
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#include <openssl/fips.h>
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#include <openssl/fips_rand.h>
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#endif
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#ifndef OPENSSL_NO_ENGINE
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/* non-NULL if default_RAND_meth is ENGINE-provided */
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static ENGINE *funct_ref =NULL;
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#endif
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static const RAND_METHOD *default_RAND_meth = NULL;
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int RAND_set_rand_method(const RAND_METHOD *meth)
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{
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#ifndef OPENSSL_NO_ENGINE
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if(funct_ref)
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{
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ENGINE_finish(funct_ref);
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funct_ref = NULL;
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}
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#endif
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default_RAND_meth = meth;
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return 1;
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}
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const RAND_METHOD *RAND_get_rand_method(void)
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{
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if (!default_RAND_meth)
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{
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#ifndef OPENSSL_NO_ENGINE
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ENGINE *e = ENGINE_get_default_RAND();
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if(e)
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{
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default_RAND_meth = ENGINE_get_RAND(e);
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if(!default_RAND_meth)
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{
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ENGINE_finish(e);
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e = NULL;
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}
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}
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if(e)
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funct_ref = e;
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else
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#endif
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default_RAND_meth = RAND_SSLeay();
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}
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return default_RAND_meth;
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}
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#ifndef OPENSSL_NO_ENGINE
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int RAND_set_rand_engine(ENGINE *engine)
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{
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const RAND_METHOD *tmp_meth = NULL;
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if(engine)
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{
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if(!ENGINE_init(engine))
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return 0;
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tmp_meth = ENGINE_get_RAND(engine);
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if(!tmp_meth)
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{
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ENGINE_finish(engine);
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return 0;
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}
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}
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/* This function releases any prior ENGINE so call it first */
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RAND_set_rand_method(tmp_meth);
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funct_ref = engine;
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return 1;
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}
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#endif
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void RAND_cleanup(void)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->cleanup)
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meth->cleanup();
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RAND_set_rand_method(NULL);
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}
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void RAND_seed(const void *buf, int num)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->seed)
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meth->seed(buf,num);
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}
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void RAND_add(const void *buf, int num, double entropy)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->add)
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meth->add(buf,num,entropy);
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}
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int RAND_bytes(unsigned char *buf, int num)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->bytes)
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return meth->bytes(buf,num);
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return(-1);
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}
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int RAND_pseudo_bytes(unsigned char *buf, int num)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->pseudorand)
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return meth->pseudorand(buf,num);
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return(-1);
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}
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int RAND_status(void)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth && meth->status)
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return meth->status();
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return 0;
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}
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#ifdef OPENSSL_FIPS
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/* FIPS DRBG initialisation code. This sets up the DRBG for use by the
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* rest of OpenSSL.
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*/
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/* Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather
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* entropy internally through RAND_poll().
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*/
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static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout,
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int entropy, size_t min_len, size_t max_len)
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{
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/* Round up request to multiple of block size */
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min_len = ((min_len + 19) / 20) * 20;
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*pout = OPENSSL_malloc(min_len);
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if (!*pout)
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return 0;
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if (RAND_SSLeay()->bytes(*pout, min_len) <= 0)
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{
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OPENSSL_free(*pout);
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*pout = NULL;
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return 0;
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}
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return min_len;
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}
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static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen)
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{
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if (out)
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{
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OPENSSL_cleanse(out, olen);
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OPENSSL_free(out);
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}
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}
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/* Set "additional input" when generating random data. This uses the
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* current PID, a time value and a counter.
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*/
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static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout)
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{
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/* Use of static variables is OK as this happens under a lock */
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static unsigned char buf[16];
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static unsigned long counter;
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FIPS_get_timevec(buf, &counter);
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*pout = buf;
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return sizeof(buf);
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}
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/* RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is
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* correctly seeded by RAND_poll().
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*/
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static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen,
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double entropy)
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{
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RAND_SSLeay()->add(in, inlen, entropy);
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return 1;
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}
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static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen)
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{
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RAND_SSLeay()->seed(in, inlen);
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return 1;
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}
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#ifndef OPENSSL_DRBG_DEFAULT_TYPE
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#define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr
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#endif
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#ifndef OPENSSL_DRBG_DEFAULT_FLAGS
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#define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF
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#endif
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static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE;
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static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS;
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void RAND_set_fips_drbg_type(int type, int flags)
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{
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fips_drbg_type = type;
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fips_drbg_flags = flags;
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}
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int RAND_init_fips(void)
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{
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DRBG_CTX *dctx;
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size_t plen;
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unsigned char pers[32], *p;
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dctx = FIPS_get_default_drbg();
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if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0)
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{
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RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG);
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return 0;
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}
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FIPS_drbg_set_callbacks(dctx,
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drbg_get_entropy, drbg_free_entropy, 20,
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drbg_get_entropy, drbg_free_entropy);
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FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0,
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drbg_rand_seed, drbg_rand_add);
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/* Personalisation string: a string followed by date time vector */
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strcpy((char *)pers, "OpenSSL DRBG2.0");
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plen = drbg_get_adin(dctx, &p);
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memcpy(pers + 16, p, plen);
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if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0)
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{
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RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG);
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return 0;
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}
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FIPS_rand_set_method(FIPS_drbg_method());
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return 1;
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}
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#endif
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