+++ /dev/null
-/* crypto/bn/bn_mulw.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.]
- */
-
-#include <stdio.h>
-#include "cryptlib.h"
-#include "bn_lcl.h"
-
-#ifdef BN_LLONG
-
-BN_ULONG bn_mul_add_words(rp,ap,num,w)
-BN_ULONG *rp,*ap;
-int num;
-BN_ULONG w;
- {
- BN_ULONG c1=0;
-
- for (;;)
- {
- mul_add(rp[0],ap[0],w,c1);
- if (--num == 0) break;
- mul_add(rp[1],ap[1],w,c1);
- if (--num == 0) break;
- mul_add(rp[2],ap[2],w,c1);
- if (--num == 0) break;
- mul_add(rp[3],ap[3],w,c1);
- if (--num == 0) break;
- ap+=4;
- rp+=4;
- }
-
- return(c1);
- }
-
-BN_ULONG bn_mul_words(rp,ap,num,w)
-BN_ULONG *rp,*ap;
-int num;
-BN_ULONG w;
- {
- BN_ULONG c1=0;
-
- for (;;)
- {
- mul(rp[0],ap[0],w,c1);
- if (--num == 0) break;
- mul(rp[1],ap[1],w,c1);
- if (--num == 0) break;
- mul(rp[2],ap[2],w,c1);
- if (--num == 0) break;
- mul(rp[3],ap[3],w,c1);
- if (--num == 0) break;
- ap+=4;
- rp+=4;
- }
- return(c1);
- }
-
-void bn_sqr_words(r,a,n)
-BN_ULONG *r,*a;
-int n;
- {
- for (;;)
- {
- BN_ULLONG t;
-
- t=(BN_ULLONG)(a[0])*(a[0]);
- r[0]=Lw(t); r[1]=Hw(t);
- if (--n == 0) break;
-
- t=(BN_ULLONG)(a[1])*(a[1]);
- r[2]=Lw(t); r[3]=Hw(t);
- if (--n == 0) break;
-
- t=(BN_ULLONG)(a[2])*(a[2]);
- r[4]=Lw(t); r[5]=Hw(t);
- if (--n == 0) break;
-
- t=(BN_ULLONG)(a[3])*(a[3]);
- r[6]=Lw(t); r[7]=Hw(t);
- if (--n == 0) break;
-
- a+=4;
- r+=8;
- }
- }
-
-BN_ULONG bn_add_words(r,a,b,n)
-BN_ULONG *r,*a,*b;
-int n;
- {
- BN_ULLONG ll;
-
- ll=0;
- for (;;)
- {
- ll+= (BN_ULLONG)a[0]+b[0];
- r[0]=(BN_ULONG)ll&BN_MASK2;
- ll>>=BN_BITS2;
- if (--n <= 0) break;
-
- ll+= (BN_ULLONG)a[1]+b[1];
- r[1]=(BN_ULONG)ll&BN_MASK2;
- ll>>=BN_BITS2;
- if (--n <= 0) break;
-
- ll+= (BN_ULLONG)a[2]+b[2];
- r[2]=(BN_ULONG)ll&BN_MASK2;
- ll>>=BN_BITS2;
- if (--n <= 0) break;
-
- ll+= (BN_ULLONG)a[3]+b[3];
- r[3]=(BN_ULONG)ll&BN_MASK2;
- ll>>=BN_BITS2;
- if (--n <= 0) break;
-
- a+=4;
- b+=4;
- r+=4;
- }
- return(ll&BN_MASK2);
- }
-
-#else
-
-BN_ULONG bn_mul_add_words(rp,ap,num,w)
-BN_ULONG *rp,*ap;
-int num;
-BN_ULONG w;
- {
- BN_ULONG c=0;
- BN_ULONG bl,bh;
-
- bl=LBITS(w);
- bh=HBITS(w);
-
- for (;;)
- {
- mul_add(rp[0],ap[0],bl,bh,c);
- if (--num == 0) break;
- mul_add(rp[1],ap[1],bl,bh,c);
- if (--num == 0) break;
- mul_add(rp[2],ap[2],bl,bh,c);
- if (--num == 0) break;
- mul_add(rp[3],ap[3],bl,bh,c);
- if (--num == 0) break;
- ap+=4;
- rp+=4;
- }
- return(c);
- }
-
-BN_ULONG bn_mul_words(rp,ap,num,w)
-BN_ULONG *rp,*ap;
-int num;
-BN_ULONG w;
- {
- BN_ULONG carry=0;
- BN_ULONG bl,bh;
-
- bl=LBITS(w);
- bh=HBITS(w);
-
- for (;;)
- {
- mul(rp[0],ap[0],bl,bh,carry);
- if (--num == 0) break;
- mul(rp[1],ap[1],bl,bh,carry);
- if (--num == 0) break;
- mul(rp[2],ap[2],bl,bh,carry);
- if (--num == 0) break;
- mul(rp[3],ap[3],bl,bh,carry);
- if (--num == 0) break;
- ap+=4;
- rp+=4;
- }
- return(carry);
- }
-
-void bn_sqr_words(r,a,n)
-BN_ULONG *r,*a;
-int n;
- {
- for (;;)
- {
- sqr64(r[0],r[1],a[0]);
- if (--n == 0) break;
-
- sqr64(r[2],r[3],a[1]);
- if (--n == 0) break;
-
- sqr64(r[4],r[5],a[2]);
- if (--n == 0) break;
-
- sqr64(r[6],r[7],a[3]);
- if (--n == 0) break;
-
- a+=4;
- r+=8;
- }
- }
-
-BN_ULONG bn_add_words(r,a,b,n)
-BN_ULONG *r,*a,*b;
-int n;
- {
- BN_ULONG t1,t2;
- int carry,i;
-
- carry=0;
- for (i=0; i<n; i++)
- {
- t1= *(a++);
- t2= *(b++);
- if (carry)
- {
- carry=(t2 >= ((~t1)&BN_MASK2));
- t2=(t1+t2+1)&BN_MASK2;
- }
- else
- {
- t2=(t1+t2)&BN_MASK2;
- carry=(t2<t1);
- }
- *(r++)=t2;
- }
- return(carry);
- }
-
-#endif
-
-#if defined(BN_LLONG) && defined(BN_DIV2W)
-
-BN_ULONG bn_div64(h,l,d)
-BN_ULONG h,l,d;
- {
- return((BN_ULONG)(((((BN_ULLONG)h)<<BN_BITS2)|l)/(BN_ULLONG)d));
- }
-
-#else
-
-/* Divide h-l by d and return the result. */
-/* I need to test this some more :-( */
-BN_ULONG bn_div64(h,l,d)
-BN_ULONG h,l,d;
- {
- BN_ULONG dh,dl,q,ret=0,th,tl,t;
- int i,count=2;
-
- if (d == 0) return(BN_MASK2);
-
- i=BN_num_bits_word(d);
- if ((i != BN_BITS2) && (h > (BN_ULONG)1<<i))
- {
-#if !defined(NO_STDIO) && !defined(WIN16)
- fprintf(stderr,"Division would overflow (%d)\n",i);
-#endif
- abort();
- }
- i=BN_BITS2-i;
- if (h >= d) h-=d;
-
- if (i)
- {
- d<<=i;
- h=(h<<i)|(l>>(BN_BITS2-i));
- l<<=i;
- }
- dh=(d&BN_MASK2h)>>BN_BITS4;
- dl=(d&BN_MASK2l);
- for (;;)
- {
- if ((h>>BN_BITS4) == dh)
- q=BN_MASK2l;
- else
- q=h/dh;
-
- for (;;)
- {
- t=(h-q*dh);
- if ((t&BN_MASK2h) ||
- ((dl*q) <= (
- (t<<BN_BITS4)+
- ((l&BN_MASK2h)>>BN_BITS4))))
- break;
- q--;
- }
- th=q*dh;
- tl=q*dl;
- t=(tl>>BN_BITS4);
- tl=(tl<<BN_BITS4)&BN_MASK2h;
- th+=t;
-
- if (l < tl) th++;
- l-=tl;
- if (h < th)
- {
- h+=d;
- q--;
- }
- h-=th;
-
- if (--count == 0) break;
-
- ret=q<<BN_BITS4;
- h=((h<<BN_BITS4)|(l>>BN_BITS4))&BN_MASK2;
- l=(l&BN_MASK2l)<<BN_BITS4;
- }
- ret|=q;
- return(ret);
- }
-#endif
-
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