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/*
* Copyright (c) 1998, 1999, 2000, 2002 Virtual Unlimited B.V.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*!\file fips186.c
* \brief FIPS 186 pseudo-random number generator.
* \author Bob Deblier <bob.deblier@pandora.be>
* \ingroup PRNG_m PRNG_fips186_m
*/
#include "system.h"
#include "beecrypt.h"
#include "endianness.h" /* XXX for encodeInts */
#include "fips186.h"
#include "mpopt.h"
#include "mp.h"
#include "debug.h"
/*!\addtogroup PRNG_fips186_m
* \{
*/
/**
*/
/*@observer@*/ /*@unchecked@*/
static uint32_t fips186hinit[5] = { 0xefcdab89U, 0x98badcfeU, 0x10325476U, 0xc3d2e1f0U, 0x67452301U };
/*@-sizeoftype@*/
const randomGenerator fips186prng = { "FIPS 186", sizeof(fips186Param), (const randomGeneratorSetup) fips186Setup, (const randomGeneratorSeed) fips186Seed, (const randomGeneratorNext) fips186Next, (const randomGeneratorCleanup) fips186Cleanup };
/*@=sizeoftype@*/
/**
*/
static int fips186init(register sha1Param* p)
/*@modifies p @*/
{
memcpy(p->h, fips186hinit, sizeof(p->h));
return 0;
}
int fips186Setup(fips186Param* fp)
{
if (fp)
{
#ifdef _REENTRANT
# if WIN32
if (!(fp->lock = CreateMutex(NULL, FALSE, NULL)))
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_init(&fp->lock, USYNC_THREAD, (void *) 0))
return -1;
# elif HAVE_PTHREAD_H
/*@-nullpass@*/
/*@-moduncon@*/
if (pthread_mutex_init(&fp->lock, (pthread_mutexattr_t *) 0))
return -1;
/*@=moduncon@*/
/*@=nullpass@*/
# endif
# endif
#endif
fp->digestremain = 0;
return entropyGatherNext((byte*) fp->state, MP_WORDS_TO_BYTES(FIPS186_STATE_SIZE));
}
return -1;
}
int fips186Seed(fips186Param* fp, const byte* data, size_t size)
{
if (fp)
{
#ifdef _REENTRANT
# if WIN32
if (WaitForSingleObject(fp->lock, INFINITE) != WAIT_OBJECT_0)
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_lock(&fp->lock))
return -1;
# elif HAVE_PTHREAD_H
/*@-moduncon@*/
if (pthread_mutex_lock(&fp->lock))
return -1;
/*@=moduncon@*/
# endif
# endif
#endif
if (data)
{
mpw seed[FIPS186_STATE_SIZE];
/* if there's too much data, cut off at what we can deal with */
if (size > MP_WORDS_TO_BYTES(FIPS186_STATE_SIZE))
size = MP_WORDS_TO_BYTES(FIPS186_STATE_SIZE);
/* convert to multi-precision integer, and add to the state */
if (os2ip(seed, FIPS186_STATE_SIZE, data, size) == 0)
(void) mpadd(FIPS186_STATE_SIZE, fp->state, seed);
}
#ifdef _REENTRANT
# if WIN32
if (!ReleaseMutex(fp->lock))
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_unlock(&fp->lock))
return -1;
# elif HAVE_PTHREAD_H
/*@-moduncon@*/
if (pthread_mutex_unlock(&fp->lock))
return -1;
/*@=moduncon@*/
# endif
# endif
#endif
return 0;
}
return -1;
}
int fips186Next(fips186Param* fp, byte* data, size_t size)
{
if (fp)
{
mpw dig[FIPS186_STATE_SIZE];
#ifdef _REENTRANT
# if WIN32
if (WaitForSingleObject(fp->lock, INFINITE) != WAIT_OBJECT_0)
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_lock(&fp->lock))
return -1;
# elif HAVE_PTHREAD_H
/*@-moduncon@*/
if (pthread_mutex_lock(&fp->lock))
return -1;
/*@=moduncon@*/
# endif
# endif
#endif
while (size > 0)
{
register size_t copy;
if (fp->digestremain == 0)
{
(void) fips186init(&fp->param);
/* copy the 512 bits of state data into the sha1Param */
memcpy(fp->param.data, fp->state, MP_WORDS_TO_BYTES(FIPS186_STATE_SIZE));
/* process the data */
sha1Process(&fp->param);
(void) encodeInts(fp->param.h, fp->digest, 5);
if (os2ip(dig, FIPS186_STATE_SIZE, fp->digest, 20) == 0)
{
/* set state to state + digest + 1 mod 2^512 */
(void) mpadd (FIPS186_STATE_SIZE, fp->state, dig);
(void) mpaddw(FIPS186_STATE_SIZE, fp->state, 1);
}
/* else shouldn't occur */
/* we now have 5 words of pseudo-random data */
fp->digestremain = 20;
}
copy = (size > fp->digestremain) ? fp->digestremain : size;
memcpy(data, fp->digest+20-fp->digestremain, copy);
fp->digestremain -= copy;
size -= copy;
data += copy;
}
#ifdef _REENTRANT
# if WIN32
if (!ReleaseMutex(fp->lock))
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_unlock(&fp->lock))
return -1;
# elif HAVE_PTHREAD_H
/*@-moduncon@*/
if (pthread_mutex_unlock(&fp->lock))
return -1;
/*@=moduncon@*/
# endif
# endif
#endif
return 0;
}
return -1;
}
int fips186Cleanup(fips186Param* fp)
{
if (fp)
{
#ifdef _REENTRANT
# if WIN32
if (!CloseHandle(fp->lock))
return -1;
# else
# if HAVE_THREAD_H && HAVE_SYNCH_H
if (mutex_destroy(&fp->lock))
return -1;
# elif HAVE_PTHREAD_H
/*@-moduncon@*/
if (pthread_mutex_destroy(&fp->lock))
return -1;
/*@=moduncon@*/
# endif
# endif
#endif
return 0;
}
return -1;
}
/*!\}
*/
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