236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/* ====================================================================
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* Copyright (c) 2003 The OpenSSL Project. All rights reserved.
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* This is a FIPS approved PRNG, ANSI X9.17, as specified in HAC,
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* Menezes et al., p.173
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*/
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#include <openssl/des.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/fips_rand.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <unistd.h>
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#define SEED_SIZE 8
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static unsigned char seed[SEED_SIZE];
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static int n_seed;
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static int o_seed;
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static DES_cblock key1;
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static DES_cblock key2;
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static DES_key_schedule ks1,ks2;
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static int key_set;
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static int test_mode;
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static unsigned char test_faketime[8];
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static void fips_rand_cleanup(void);
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static void fips_rand_seed(const void *buf, int num);
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static void fips_rand_add(const void *buf, int num, double add_entropy);
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static int fips_rand_bytes(unsigned char *buf, int num);
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static int fips_rand_status(void);
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RAND_METHOD rand_fips_meth=
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{
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fips_rand_seed,
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fips_rand_bytes,
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fips_rand_cleanup,
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fips_rand_add,
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fips_rand_bytes,
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fips_rand_status
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};
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void FIPS_set_prng_key(const unsigned char k1[8],const unsigned char k2[8])
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{
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memcpy(&key1,k1,sizeof key1);
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memcpy(&key2,k2,sizeof key2);
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key_set=1;
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}
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void FIPS_test_mode(int test,const unsigned char faketime[8])
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{
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test_mode=test;
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if(!test_mode)
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return;
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memcpy(test_faketime,faketime,sizeof test_faketime);
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}
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static void fips_gettime(unsigned char buf[8])
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{
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struct timeval tv;
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#ifndef GETPID_IS_MEANINGLESS
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long pid;
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#endif
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if(test_mode)
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{
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fprintf(stderr,"WARNING!!! PRNG IN TEST MODE!!!\n");
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memcpy(buf,test_faketime,sizeof test_faketime);
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return;
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}
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gettimeofday(&tv,NULL);
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assert(sizeof(long) == 4);
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*(long *)&buf[0]=tv.tv_sec;
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*(long *)&buf[4]=tv.tv_usec;
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#ifndef GETPID_IS_MEANINGLESS
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/* we mix in the PID to ensure that after a fork the children don't give
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* the same results as each other
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*/
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pid=getpid();
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/* make sure we shift the pid to the MSB */
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if((pid&0xffff0000) == 0)
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pid<<=16;
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*(long *)&buf[0]^=pid;
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#endif
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}
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static void fips_rand_encrypt(unsigned char *out,const unsigned char *in)
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{
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DES_ecb2_encrypt(in,out,&ks1,&ks2,1);
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}
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static void fips_rand_cleanup(void)
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{
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OPENSSL_cleanse(seed,sizeof seed);
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n_seed=0;
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}
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static void fips_rand_seed(const void *buf_, int num)
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{
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const char *buf=buf_;
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int n;
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static int init;
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/* If the key hasn't been set, we can't seed! */
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if(!key_set)
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return;
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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if(!init)
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{
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init=1;
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DES_set_key(&key1,&ks1);
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DES_set_key(&key2,&ks2);
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}
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/*
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* This algorithm only uses 64 bits of seed, so ensure that we use
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* the most recent 64 bits.
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*/
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for(n=0 ; n < num ; )
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{
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int t=num-n;
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if(o_seed+t > sizeof seed)
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t=sizeof seed-o_seed;
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memcpy(seed+o_seed,buf+n,t);
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n+=t;
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o_seed+=t;
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if(o_seed == sizeof seed)
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o_seed=0;
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if(n_seed < sizeof seed)
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n_seed+=t;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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}
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static void fips_rand_add(const void *buf, int num, double add_entropy)
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{
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fips_rand_seed(buf,num);
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}
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static int fips_rand_bytes(unsigned char *buf,int num)
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{
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int n;
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unsigned char timeseed[8];
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unsigned char intermediate[SEED_SIZE];
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unsigned char output[SEED_SIZE];
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if(n_seed < sizeof seed)
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{
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RANDerr(RAND_F_FIPS_RAND_BYTES,RAND_R_PRNG_NOT_SEEDED);
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return 0;
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}
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fips_gettime(timeseed);
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fips_rand_encrypt(intermediate,timeseed);
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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for(n=0 ; n < num ; )
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{
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unsigned char t[SEED_SIZE];
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int l;
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/* now generate a full 64 bits of "randomness" */
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for(l=0 ; l < sizeof t ; ++l)
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t[l]=intermediate[l]^seed[l];
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fips_rand_encrypt(output,t);
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for(l=0 ; l < sizeof t ; ++l)
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t[l]=output[l]^seed[l];
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fips_rand_encrypt(seed,t);
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l=SEED_SIZE < num-n ? SEED_SIZE : num-n;
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memcpy(buf+n,output,l);
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n+=l;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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return num;
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}
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static int fips_rand_status(void)
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{
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return n_seed == sizeof seed;
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}
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