From 07ca4eaa9d8df67acdccc86c782bcef685d49e2c Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 19 Dec 2000 17:20:22 +0000
Subject: Removed files from the HEAD revision, because they are now in another
 repository

---
 mpi/mpi-mpow.c | 222 ---------------------------------------------------------
 1 file changed, 222 deletions(-)
 delete mode 100644 mpi/mpi-mpow.c

(limited to 'mpi/mpi-mpow.c')

diff --git a/mpi/mpi-mpow.c b/mpi/mpi-mpow.c
deleted file mode 100644
index 556f7e116..000000000
--- a/mpi/mpi-mpow.c
+++ /dev/null
@@ -1,222 +0,0 @@
-/* mpi-mpow.c  -  MPI functions
- *	Copyright (C) 1998, 1999 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * GnuPG is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * GnuPG 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "mpi-internal.h"
-#include "longlong.h"
-#include <assert.h>
-
-/* Barrett is slower than the classical way.  It can be tweaked by
- * using partial multiplications
- */
-/*#define USE_BARRETT*/
-
-
-
-#ifdef USE_BARRETT
-static void barrett_mulm( MPI w, MPI u, MPI v, MPI m, MPI y, int k, MPI r1, MPI r2 );
-static MPI init_barrett( MPI m, int *k, MPI *r1, MPI *r2 );
-static int calc_barrett( MPI r, MPI x, MPI m, MPI y, int k, MPI r1, MPI r2  );
-#else
-#define barrett_mulm( w, u, v, m, y, k, r1, r2 ) mpi_mulm( (w), (u), (v), (m) )
-#endif
-
-
-static int
-build_index( MPI *exparray, int k, int i, int t )
-{
-    int j, bitno;
-    int idx = 0;
-
-    bitno = t-i;
-    for(j=k-1; j >= 0; j-- ) {
-	idx <<= 1;
-	if( mpi_test_bit( exparray[j], bitno ) )
-	    idx |= 1;
-    }
-    /*log_debug("t=%d i=%d idx=%d\n", t, i, idx );*/
-    return idx;
-}
-
-/****************
- * RES = (BASE[0] ^ EXP[0]) *  (BASE[1] ^ EXP[1]) * ... * mod M
- */
-void
-mpi_mulpowm( MPI res, MPI *basearray, MPI *exparray, MPI m)
-{
-    int k;	/* number of elements */
-    int t;	/* bit size of largest exponent */
-    int i, j, idx;
-    MPI *G;	/* table with precomputed values of size 2^k */
-    MPI tmp;
-  #ifdef USE_BARRETT
-    MPI barrett_y, barrett_r1, barrett_r2;
-    int barrett_k;
-  #endif
-
-    for(k=0; basearray[k]; k++ )
-	;
-    assert(k);
-    for(t=0, i=0; (tmp=exparray[i]); i++ ) {
-	/*log_mpidump("exp: ", tmp );*/
-	j = mpi_get_nbits(tmp);
-	if( j > t )
-	    t = j;
-    }
-    /*log_mpidump("mod: ", m );*/
-    assert(i==k);
-    assert(t);
-    assert( k < 10 );
-
-    G = g10_xcalloc( (1<<k) , sizeof *G );
-  #ifdef USE_BARRETT
-    barrett_y = init_barrett( m, &barrett_k, &barrett_r1, &barrett_r2 );
-  #endif
-    /* and calculate */
-    tmp =  mpi_alloc( mpi_get_nlimbs(m)+1 );
-    mpi_set_ui( res, 1 );
-    for(i = 1; i <= t; i++ ) {
-	barrett_mulm(tmp, res, res, m, barrett_y, barrett_k,
-				       barrett_r1, barrett_r2 );
-	idx = build_index( exparray, k, i, t );
-	assert( idx >= 0 && idx < (1<<k) );
-	if( !G[idx] ) {
-	    if( !idx )
-		 G[0] = mpi_alloc_set_ui( 1 );
-	    else {
-		for(j=0; j < k; j++ ) {
-		    if( (idx & (1<<j) ) ) {
-			if( !G[idx] )
-			    G[idx] = mpi_copy( basearray[j] );
-			else
-			    barrett_mulm( G[idx], G[idx], basearray[j],
-					       m, barrett_y, barrett_k, barrett_r1, barrett_r2	);
-		    }
-		}
-		if( !G[idx] )
-		    G[idx] = mpi_alloc(0);
-	    }
-	}
-	barrett_mulm(res, tmp, G[idx], m, barrett_y, barrett_k, barrett_r1, barrett_r2	);
-    }
-
-    /* cleanup */
-    mpi_free(tmp);
-  #ifdef USE_BARRETT
-    mpi_free(barrett_y);
-    mpi_free(barrett_r1);
-    mpi_free(barrett_r2);
-  #endif
-    for(i=0; i < (1<<k); i++ )
-	mpi_free(G[i]);
-    g10_free(G);
-}
-
-
-
-#ifdef USE_BARRETT
-static void
-barrett_mulm( MPI w, MPI u, MPI v, MPI m, MPI y, int k, MPI r1, MPI r2	)
-{
-    mpi_mul(w, u, v);
-    if( calc_barrett( w, w, m, y, k, r1, r2 ) )
-	mpi_fdiv_r( w, w, m );
-}
-
-/****************
- * Barrett precalculation: y = floor(b^(2k) / m)
- */
-static MPI
-init_barrett( MPI m, int *k, MPI *r1, MPI *r2 )
-{
-    MPI tmp;
-
-    mpi_normalize( m );
-    *k = mpi_get_nlimbs( m );
-    tmp = mpi_alloc( *k + 1 );
-    mpi_set_ui( tmp, 1 );
-    mpi_lshift_limbs( tmp, 2 * *k );
-    mpi_fdiv_q( tmp, tmp, m );
-    *r1 = mpi_alloc( 2* *k + 1 );
-    *r2 = mpi_alloc( 2* *k + 1 );
-    return tmp;
-}
-
-/****************
- * Barrett reduction: We assume that these conditions are met:
- * Given x =(x_2k-1 ...x_0)_b
- *	 m =(m_k-1 ....m_0)_b	  with m_k-1 != 0
- * Output r = x mod m
- * Before using this function init_barret must be used to calucalte y and k.
- * Returns: false = no error
- *	    true = can't perform barret reduction
- */
-static int
-calc_barrett( MPI r, MPI x, MPI m, MPI y, int k, MPI r1, MPI r2 )
-{
-    int xx = k > 3 ? k-3:0;
-
-    mpi_normalize( x );
-    if( mpi_get_nlimbs(x) > 2*k )
-	return 1; /* can't do it */
-
-    /* 1. q1 = floor( x / b^k-1)
-     *	  q2 = q1 * y
-     *	  q3 = floor( q2 / b^k+1 )
-     * Actually, we don't need qx, we can work direct on r2
-     */
-    mpi_set( r2, x );
-    mpi_rshift_limbs( r2, k-1 );
-    mpi_mul( r2, r2, y );
-    mpi_rshift_limbs( r2, k+1 );
-
-    /* 2. r1 = x mod b^k+1
-     *	  r2 = q3 * m mod b^k+1
-     *	  r  = r1 - r2
-     * 3. if r < 0 then  r = r + b^k+1
-     */
-    mpi_set( r1, x );
-    if( r1->nlimbs > k+1 ) /* quick modulo operation */
-	r1->nlimbs = k+1;
-    mpi_mul( r2, r2, m );
-    if( r2->nlimbs > k+1 ) /* quick modulo operation */
-	r2->nlimbs = k+1;
-    mpi_sub( r, r1, r2 );
-
-    if( mpi_is_neg( r ) ) {
-	MPI tmp;
-
-	tmp = mpi_alloc( k + 2 );
-	mpi_set_ui( tmp, 1 );
-	mpi_lshift_limbs( tmp, k+1 );
-	mpi_add( r, r, tmp );
-	mpi_free(tmp);
-    }
-
-    /* 4. while r >= m do r = r - m */
-    while( mpi_cmp( r, m ) >= 0 )
-	mpi_sub( r, r, m );
-
-    return 0;
-}
-#endif /* USE_BARRETT */
-
-- 
cgit