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+/* crypto/bn/bn_asm.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.]
+ */
+
+#ifndef BN_DEBUG
+# undef NDEBUG /* avoid conflicting definitions */
+# define NDEBUG
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+#include "bn_lcl.h"
+
+#if defined(BN_LLONG) || defined(BN_UMULT_HIGH)
+
+BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
+ {
+ BN_ULONG c1=0;
+
+ assert(num >= 0);
+ if (num <= 0) return(c1);
+
+ while (num&~3)
+ {
+ mul_add(rp[0],ap[0],w,c1);
+ mul_add(rp[1],ap[1],w,c1);
+ mul_add(rp[2],ap[2],w,c1);
+ mul_add(rp[3],ap[3],w,c1);
+ ap+=4; rp+=4; num-=4;
+ }
+ if (num)
+ {
+ mul_add(rp[0],ap[0],w,c1); if (--num==0) return c1;
+ mul_add(rp[1],ap[1],w,c1); if (--num==0) return c1;
+ mul_add(rp[2],ap[2],w,c1); return c1;
+ }
+
+ return(c1);
+ }
+
+BN_ULONG bn_mul_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
+ {
+ BN_ULONG c1=0;
+
+ assert(num >= 0);
+ if (num <= 0) return(c1);
+
+ while (num&~3)
+ {
+ mul(rp[0],ap[0],w,c1);
+ mul(rp[1],ap[1],w,c1);
+ mul(rp[2],ap[2],w,c1);
+ mul(rp[3],ap[3],w,c1);
+ ap+=4; rp+=4; num-=4;
+ }
+ if (num)
+ {
+ mul(rp[0],ap[0],w,c1); if (--num == 0) return c1;
+ mul(rp[1],ap[1],w,c1); if (--num == 0) return c1;
+ mul(rp[2],ap[2],w,c1);
+ }
+ return(c1);
+ }
+
+void bn_sqr_words(BN_ULONG *r, BN_ULONG *a, int n)
+ {
+ assert(n >= 0);
+ if (n <= 0) return;
+ while (n&~3)
+ {
+ sqr(r[0],r[1],a[0]);
+ sqr(r[2],r[3],a[1]);
+ sqr(r[4],r[5],a[2]);
+ sqr(r[6],r[7],a[3]);
+ a+=4; r+=8; n-=4;
+ }
+ if (n)
+ {
+ sqr(r[0],r[1],a[0]); if (--n == 0) return;
+ sqr(r[2],r[3],a[1]); if (--n == 0) return;
+ sqr(r[4],r[5],a[2]);
+ }
+ }
+
+#else /* !(defined(BN_LLONG) || defined(BN_UMULT_HIGH)) */
+
+BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
+ {
+ BN_ULONG c=0;
+ BN_ULONG bl,bh;
+
+ assert(num >= 0);
+ if (num <= 0) return((BN_ULONG)0);
+
+ 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(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
+ {
+ BN_ULONG carry=0;
+ BN_ULONG bl,bh;
+
+ assert(num >= 0);
+ if (num <= 0) return((BN_ULONG)0);
+
+ 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(BN_ULONG *r, BN_ULONG *a, int n)
+ {
+ assert(n >= 0);
+ if (n <= 0) return;
+ 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;
+ }
+ }
+
+#endif /* !(defined(BN_LLONG) || defined(BN_UMULT_HIGH)) */
+
+#if defined(BN_LLONG) && defined(BN_DIV2W)
+
+BN_ULONG bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG 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_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG 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);
+ assert((i == BN_BITS2) || (h > (BN_ULONG)1<<i));
+
+ 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;
+
+ th=q*dh;
+ tl=dl*q;
+ for (;;)
+ {
+ t=h-th;
+ if ((t&BN_MASK2h) ||
+ ((tl) <= (
+ (t<<BN_BITS4)|
+ ((l&BN_MASK2h)>>BN_BITS4))))
+ break;
+ q--;
+ th-=dh;
+ tl-=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 /* !defined(BN_LLONG) && defined(BN_DIV2W) */
+
+#ifdef BN_LLONG
+BN_ULONG bn_add_words(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n)
+ {
+ BN_ULLONG ll=0;
+
+ assert(n >= 0);
+ if (n <= 0) return((BN_ULONG)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((BN_ULONG)ll);
+ }
+#else /* !BN_LLONG */
+BN_ULONG bn_add_words(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n)
+ {
+ BN_ULONG c,l,t;
+
+ assert(n >= 0);
+ if (n <= 0) return((BN_ULONG)0);
+
+ c=0;
+ for (;;)
+ {
+ t=a[0];
+ t=(t+c)&BN_MASK2;
+ c=(t < c);
+ l=(t+b[0])&BN_MASK2;
+ c+=(l < t);
+ r[0]=l;
+ if (--n <= 0) break;
+
+ t=a[1];
+ t=(t+c)&BN_MASK2;
+ c=(t < c);
+ l=(t+b[1])&BN_MASK2;
+ c+=(l < t);
+ r[1]=l;
+ if (--n <= 0) break;
+
+ t=a[2];
+ t=(t+c)&BN_MASK2;
+ c=(t < c);
+ l=(t+b[2])&BN_MASK2;
+ c+=(l < t);
+ r[2]=l;
+ if (--n <= 0) break;
+
+ t=a[3];
+ t=(t+c)&BN_MASK2;
+ c=(t < c);
+ l=(t+b[3])&BN_MASK2;
+ c+=(l < t);
+ r[3]=l;
+ if (--n <= 0) break;
+
+ a+=4;
+ b+=4;
+ r+=4;
+ }
+ return((BN_ULONG)c);
+ }
+#endif /* !BN_LLONG */
generated by cgit v1.1 at 2024-12-21 02:35:11 +0000