/* unused */

/* crypto/bn/expspeed.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.]
 */

/* most of this code has been pilfered from my libdes speed.c program */

#define BASENUM	5000
#define NUM_START 0


/* determine timings for modexp, modmul, modsqr, gcd, Kronecker symbol,
 * modular inverse, or modular square roots */
#define TEST_EXP
#undef TEST_MUL
#undef TEST_SQR
#undef TEST_GCD
#undef TEST_KRON
#undef TEST_INV
#undef TEST_SQRT
#define P_MOD_64 9 /* least significant 6 bits for prime to be used for BN_sqrt timings */

#if defined(TEST_EXP) + defined(TEST_MUL) + defined(TEST_SQR) + defined(TEST_GCD) + defined(TEST_KRON) + defined(TEST_INV) +defined(TEST_SQRT) != 1
#  error "choose one test"
#endif

#if defined(TEST_INV) || defined(TEST_SQRT)
#  define C_PRIME
static void genprime_cb(int p, int n, void *arg);
#endif



#undef PROG
#define PROG bnspeed_main

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/rand.h>

#if !defined(OPENSSL_SYS_MSDOS) && (!defined(OPENSSL_SYS_VMS) || defined(__DECC)) && !defined(OPENSSL_SYS_MACOSX)
#define TIMES
#endif

#ifndef _IRIX
#include <time.h>
#endif
#ifdef TIMES
#include <sys/types.h>
#include <sys/times.h>
#endif

/* Depending on the VMS version, the tms structure is perhaps defined.
   The __TMS macro will show if it was.  If it wasn't defined, we should
   undefine TIMES, since that tells the rest of the program how things
   should be handled.				-- Richard Levitte */
#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__TMS)
#undef TIMES
#endif

#ifndef TIMES
#include <sys/timeb.h>
#endif

#if defined(sun) || defined(__ultrix)
#define _POSIX_SOURCE
#include <limits.h>
#include <sys/param.h>
#endif

#include <openssl/bn.h>
#include <openssl/x509.h>

/* The following if from times(3) man page.  It may need to be changed */
#ifndef HZ
# ifndef CLK_TCK
#  ifndef _BSD_CLK_TCK_ /* FreeBSD hack */
#   define HZ	100.0
#  else /* _BSD_CLK_TCK_ */
#   define HZ ((double)_BSD_CLK_TCK_)
#  endif
# else /* CLK_TCK */
#  define HZ ((double)CLK_TCK)
# endif
#endif

#undef BUFSIZE
#define BUFSIZE	((long)1024*8)
int run=0;

static double Time_F(int s);
#define START	0
#define STOP	1

static double Time_F(int s)
	{
	double ret;
#ifdef TIMES
	static struct tms tstart,tend;

	if (s == START)
		{
		times(&tstart);
		return(0);
		}
	else
		{
		times(&tend);
		ret=((double)(tend.tms_utime-tstart.tms_utime))/HZ;
		return((ret < 1e-3)?1e-3:ret);
		}
#else /* !times() */
	static struct timeb tstart,tend;
	long i;

	if (s == START)
		{
		ftime(&tstart);
		return(0);
		}
	else
		{
		ftime(&tend);
		i=(long)tend.millitm-(long)tstart.millitm;
		ret=((double)(tend.time-tstart.time))+((double)i)/1000.0;
		return((ret < 0.001)?0.001:ret);
		}
#endif
	}

#define NUM_SIZES	7
#if NUM_START > NUM_SIZES
#   error "NUM_START > NUM_SIZES"
#endif
static int sizes[NUM_SIZES]={128,256,512,1024,2048,4096,8192};
static int mul_c[NUM_SIZES]={8*8*8*8*8*8,8*8*8*8*8,8*8*8*8,8*8*8,8*8,8,1};
/*static int sizes[NUM_SIZES]={59,179,299,419,539}; */

#define RAND_SEED(string) { const char str[] = string; RAND_seed(string, sizeof str); }

void do_mul_exp(BIGNUM *r,BIGNUM *a,BIGNUM *b,BIGNUM *c,BN_CTX *ctx); 

int main(int argc, char **argv)
	{
	BN_CTX *ctx;
	BIGNUM *a,*b,*c,*r;

#if 1
	if (!CRYPTO_set_mem_debug_functions(0,0,0,0,0))
		abort();
#endif

	ctx=BN_CTX_new();
	a=BN_new();
	b=BN_new();
	c=BN_new();
	r=BN_new();

	while (!RAND_status())
		/* not enough bits */
		RAND_SEED("I demand a manual recount!");

	do_mul_exp(r,a,b,c,ctx);
	return 0;
	}

void do_mul_exp(BIGNUM *r, BIGNUM *a, BIGNUM *b, BIGNUM *c, BN_CTX *ctx)
	{
	int i,k;
	double tm;
	long num;

	num=BASENUM;
	for (i=NUM_START; i<NUM_SIZES; i++)
		{
#ifdef C_PRIME
#  ifdef TEST_SQRT
		if (!BN_set_word(a, 64)) goto err;
		if (!BN_set_word(b, P_MOD_64)) goto err;
#    define ADD a
#    define REM b
#  else
#    define ADD NULL
#    define REM NULL
#  endif
		if (!BN_generate_prime(c,sizes[i],0,ADD,REM,genprime_cb,NULL)) goto err;
		putc('\n', stderr);
		fflush(stderr);
#endif

		for (k=0; k<num; k++)
			{
			if (k%50 == 0) /* Average over num/50 different choices of random numbers. */
				{
				if (!BN_pseudo_rand(a,sizes[i],1,0)) goto err;

				if (!BN_pseudo_rand(b,sizes[i],1,0)) goto err;

#ifndef C_PRIME
				if (!BN_pseudo_rand(c,sizes[i],1,1)) goto err;
#endif

#ifdef TEST_SQRT				
				if (!BN_mod_sqr(a,a,c,ctx)) goto err;
				if (!BN_mod_sqr(b,b,c,ctx)) goto err;
#else
				if (!BN_nnmod(a,a,c,ctx)) goto err;
				if (!BN_nnmod(b,b,c,ctx)) goto err;
#endif

				if (k == 0)
					Time_F(START);
				}

#if defined(TEST_EXP)
			if (!BN_mod_exp(r,a,b,c,ctx)) goto err;
#elif defined(TEST_MUL)
			{
			int i = 0;
			for (i = 0; i < 50; i++)
				if (!BN_mod_mul(r,a,b,c,ctx)) goto err;
			}
#elif defined(TEST_SQR)
			{
			int i = 0;
			for (i = 0; i < 50; i++)
				{
				if (!BN_mod_sqr(r,a,c,ctx)) goto err;
				if (!BN_mod_sqr(r,b,c,ctx)) goto err;
				}
			}
#elif defined(TEST_GCD)
			if (!BN_gcd(r,a,b,ctx)) goto err;
			if (!BN_gcd(r,b,c,ctx)) goto err;
			if (!BN_gcd(r,c,a,ctx)) goto err;
#elif defined(TEST_KRON)
			if (-2 == BN_kronecker(a,b,ctx)) goto err;
			if (-2 == BN_kronecker(b,c,ctx)) goto err;
			if (-2 == BN_kronecker(c,a,ctx)) goto err;
#elif defined(TEST_INV)
			if (!BN_mod_inverse(r,a,c,ctx)) goto err;
			if (!BN_mod_inverse(r,b,c,ctx)) goto err;
#else /* TEST_SQRT */
			if (!BN_mod_sqrt(r,a,c,ctx)) goto err;
			if (!BN_mod_sqrt(r,b,c,ctx)) goto err;
#endif
			}
		tm=Time_F(STOP);
		printf(
#if defined(TEST_EXP)
			"modexp %4d ^ %4d %% %4d"
#elif defined(TEST_MUL)
			"50*modmul %4d %4d %4d"
#elif defined(TEST_SQR)
			"100*modsqr %4d %4d %4d"
#elif defined(TEST_GCD)
			"3*gcd %4d %4d %4d"
#elif defined(TEST_KRON)
			"3*kronecker %4d %4d %4d"
#elif defined(TEST_INV)
			"2*inv %4d %4d mod %4d"
#else /* TEST_SQRT */
			"2*sqrt [prime == %d (mod 64)] %4d %4d mod %4d"
#endif
			" -> %8.3fms %5.1f (%ld)\n",
#ifdef TEST_SQRT
			P_MOD_64,
#endif
			sizes[i],sizes[i],sizes[i],tm*1000.0/num,tm*mul_c[i]/num, num);
		num/=7;
		if (num <= 0) num=1;
		}
	return;

 err:
	ERR_print_errors_fp(stderr);
	}


#ifdef C_PRIME
static void genprime_cb(int p, int n, void *arg)
	{
	char c='*';

	if (p == 0) c='.';
	if (p == 1) c='+';
	if (p == 2) c='*';
	if (p == 3) c='\n';
	putc(c, stderr);
	fflush(stderr);
	(void)n;
	(void)arg;
	}
#endif
