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openssl/crypto/bn/bn_mont.c

Index: openssl/crypto/bn/bn_mont.c
===================================================================
--- openssl/crypto/bn/bn_mont.c	(revision 105093)
+++ openssl/crypto/bn/bn_mont.c	(working copy)
@@ -122,26 +122,10 @@
 
 #define MONT_WORD /* use the faster word-based algorithm */
 
-#if defined(MONT_WORD) && defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)
-/* This condition means we have a specific non-default build:
- * In the 0.9.8 branch, OPENSSL_BN_ASM_MONT is normally not set for any
- * BN_BITS2<=32 platform; an explicit "enable-montasm" is required.
- * I.e., if we are here, the user intentionally deviates from the
- * normal stable build to get better Montgomery performance from
- * the 0.9.9-dev backport.
- *
- * In this case only, we also enable BN_from_montgomery_word()
- * (another non-stable feature from 0.9.9-dev).
- */
-#define MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
-#endif
-
-#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
+#ifdef MONT_WORD
 static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont);
 #endif
 
-
-
 int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
 			  BN_MONT_CTX *mont, BN_CTX *ctx)
 	{
@@ -153,11 +137,7 @@
 	if (num>1 && a->top==num && b->top==num)
 		{
 		if (bn_wexpand(r,num) == NULL) return(0);
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
 		if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,mont->n0,num))
-#else
-		if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,&mont->n0,num))
-#endif
 			{
 			r->neg = a->neg^b->neg;
 			r->top = num;
@@ -181,7 +161,7 @@
 		if (!BN_mul(tmp,a,b,ctx)) goto err;
 		}
 	/* reduce from aRR to aR */
-#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
+#ifdef MONT_WORD
 	if (!BN_from_montgomery_word(r,tmp,mont)) goto err;
 #else
 	if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err;
@@ -193,7 +173,7 @@
 	return(ret);
 	}
 
-#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
+#ifdef MONT_WORD
 static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)
 	{
 	BIGNUM *n;
@@ -217,15 +197,15 @@
 	nrp= &(r->d[nl]);
 
 	/* clear the top words of T */
+#if 1
 	for (i=r->top; i<max; i++) /* memset? XXX */
 		r->d[i]=0;
+#else
+	memset(&(r->d[r->top]),0,(max-r->top)*sizeof(BN_ULONG)); 
+#endif
 
 	r->top=max;
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
 	n0=mont->n0[0];
-#else
-	n0=mont->n0;
-#endif
 
 #ifdef BN_COUNT
 	fprintf(stderr,"word BN_from_montgomery_word %d * %d\n",nl,nl);
@@ -270,6 +250,8 @@
 		}
 	al=r->top-ri;
 
+#define BRANCH_FREE 1
+#if BRANCH_FREE
 	if (bn_wexpand(ret,ri) == NULL) return(0);
 	x=0-(((al-ri)>>(sizeof(al)*8-1))&1);
 	ret->top=x=(ri&~x)|(al&x);	/* min(ri,al) */
@@ -295,7 +277,7 @@
 	m1|=m2;			/* (al!=ri) */
 	m1|=(0-(size_t)v);	/* (al!=ri || v) */
 	m1&=~m2;		/* (al!=ri || v) && !al>ri */
-	nrp=(BN_ULONG *)(((size_t)rp&~m1)|((size_t)ap&m1));
+	nrp=(BN_ULONG *)(((PTR_SIZE_INT)rp&~m1)|((PTR_SIZE_INT)ap&m1));
 	}
 
 	/* 'i<ri' is chosen to eliminate dependency on input data, even
@@ -317,164 +299,8 @@
 		rp[i]=nrp[i], ap[i]=0;
 	bn_correct_top(r);
 	bn_correct_top(ret);
-	bn_check_top(ret);
-
-	return(1);
-	}
-
-int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
-	     BN_CTX *ctx)
-	{
-	int retn=0;
-	BIGNUM *t;
-
-	BN_CTX_start(ctx);
-	if ((t = BN_CTX_get(ctx)) && BN_copy(t,a))
-		retn = BN_from_montgomery_word(ret,t,mont);
-	BN_CTX_end(ctx);
-	return retn;
-	}
-
-#else /* !MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
-
-int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
-	     BN_CTX *ctx)
-	{
-	int retn=0;
-
-#ifdef MONT_WORD
-	BIGNUM *n,*r;
-	BN_ULONG *ap,*np,*rp,n0,v,*nrp;
-	int al,nl,max,i,x,ri;
-
-	BN_CTX_start(ctx);
-	if ((r = BN_CTX_get(ctx)) == NULL) goto err;
-
-	if (!BN_copy(r,a)) goto err;
-	n= &(mont->N);
-
-	ap=a->d;
-	/* mont->ri is the size of mont->N in bits (rounded up
-	   to the word size) */
-	al=ri=mont->ri/BN_BITS2;
-	
-	nl=n->top;
-	if ((al == 0) || (nl == 0)) { r->top=0; return(1); }
-
-	max=(nl+al+1); /* allow for overflow (no?) XXX */
-	if (bn_wexpand(r,max) == NULL) goto err;
-
-	r->neg=a->neg^n->neg;
-	np=n->d;
-	rp=r->d;
-	nrp= &(r->d[nl]);
-
-	/* clear the top words of T */
-#if 1
-	for (i=r->top; i<max; i++) /* memset? XXX */
-		r->d[i]=0;
 #else
-	memset(&(r->d[r->top]),0,(max-r->top)*sizeof(BN_ULONG)); 
-#endif
-
-	r->top=max;
-	n0=mont->n0;
-
-#ifdef BN_COUNT
-	fprintf(stderr,"word BN_from_montgomery %d * %d\n",nl,nl);
-#endif
-	for (i=0; i<nl; i++)
-		{
-#ifdef __TANDEM
-                {
-                   long long t1;
-                   long long t2;
-                   long long t3;
-                   t1 = rp[0] * (n0 & 0177777);
-                   t2 = 037777600000l;
-                   t2 = n0 & t2;
-                   t3 = rp[0] & 0177777;
-                   t2 = (t3 * t2) & BN_MASK2;
-                   t1 = t1 + t2;
-                   v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1);
-                }
-#else
-		v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
-#endif
-		nrp++;
-		rp++;
-		if (((nrp[-1]+=v)&BN_MASK2) >= v)
-			continue;
-		else
-			{
-			if (((++nrp[0])&BN_MASK2) != 0) continue;
-			if (((++nrp[1])&BN_MASK2) != 0) continue;
-			for (x=2; (((++nrp[x])&BN_MASK2) == 0); x++) ;
-			}
-		}
-	bn_correct_top(r);
-	
-	/* mont->ri will be a multiple of the word size and below code
-	 * is kind of BN_rshift(ret,r,mont->ri) equivalent */
-	if (r->top <= ri)
-		{
-		ret->top=0;
-		retn=1;
-		goto err;
-		}
-	al=r->top-ri;
-
-# define BRANCH_FREE 1
-# if BRANCH_FREE
-	if (bn_wexpand(ret,ri) == NULL) goto err;
-	x=0-(((al-ri)>>(sizeof(al)*8-1))&1);
-	ret->top=x=(ri&~x)|(al&x);	/* min(ri,al) */
-	ret->neg=r->neg;
-
-	rp=ret->d;
-	ap=&(r->d[ri]);
-
-	{
-	size_t m1,m2;
-
-	v=bn_sub_words(rp,ap,np,ri);
-	/* this ----------------^^ works even in al<ri case
-	 * thanks to zealous zeroing of top of the vector in the
-	 * beginning. */
-
-	/* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
-	/* in other words if subtraction result is real, then
-	 * trick unconditional memcpy below to perform in-place
-	 * "refresh" instead of actual copy. */
-	m1=0-(size_t)(((al-ri)>>(sizeof(al)*8-1))&1);	/* al<ri */
-	m2=0-(size_t)(((ri-al)>>(sizeof(al)*8-1))&1);	/* al>ri */
-	m1|=m2;			/* (al!=ri) */
-	m1|=(0-(size_t)v);	/* (al!=ri || v) */
-	m1&=~m2;		/* (al!=ri || v) && !al>ri */
-	nrp=(BN_ULONG *)(((size_t)rp&~m1)|((size_t)ap&m1));
-	}
-
-	/* 'i<ri' is chosen to eliminate dependency on input data, even
-	 * though it results in redundant copy in al<ri case. */
-	for (i=0,ri-=4; i<ri; i+=4)
-		{
-		BN_ULONG t1,t2,t3,t4;
-		
-		t1=nrp[i+0];
-		t2=nrp[i+1];
-		t3=nrp[i+2];	ap[i+0]=0;
-		t4=nrp[i+3];	ap[i+1]=0;
-		rp[i+0]=t1;	ap[i+2]=0;
-		rp[i+1]=t2;	ap[i+3]=0;
-		rp[i+2]=t3;
-		rp[i+3]=t4;
-		}
-	for (ri+=4; i<ri; i++)
-		rp[i]=nrp[i], ap[i]=0;
-	bn_correct_top(r);
-	bn_correct_top(ret);
-# else
-	if (bn_wexpand(ret,al) == NULL) goto err;
+	if (bn_wexpand(ret,al) == NULL) return(0);
 	ret->top=al;
 	ret->neg=r->neg;
 
@@ -497,8 +323,30 @@
 	al+=4;
 	for (; i<al; i++)
 		rp[i]=ap[i];
-# endif
-#else /* !MONT_WORD */ 
+
+	if (BN_ucmp(ret, &(mont->N)) >= 0)
+		{
+		if (!BN_usub(ret,ret,&(mont->N))) return(0);
+		}
+#endif
+	bn_check_top(ret);
+
+	return(1);
+	}
+#endif	/* MONT_WORD */
+
+int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
+	     BN_CTX *ctx)
+	{
+	int retn=0;
+#ifdef MONT_WORD
+	BIGNUM *t;
+
+	BN_CTX_start(ctx);
+	if ((t = BN_CTX_get(ctx)) && BN_copy(t,a))
+		retn = BN_from_montgomery_word(ret,t,mont);
+	BN_CTX_end(ctx);
+#else /* !MONT_WORD */
 	BIGNUM *t1,*t2;
 
 	BN_CTX_start(ctx);
@@ -515,21 +363,18 @@
 	if (!BN_mul(t1,t2,&mont->N,ctx)) goto err;
 	if (!BN_add(t2,a,t1)) goto err;
 	if (!BN_rshift(ret,t2,mont->ri)) goto err;
-#endif /* MONT_WORD */
 
-#if !defined(BRANCH_FREE) || BRANCH_FREE==0
 	if (BN_ucmp(ret, &(mont->N)) >= 0)
 		{
 		if (!BN_usub(ret,ret,&(mont->N))) goto err;
 		}
-#endif
 	retn=1;
 	bn_check_top(ret);
  err:
 	BN_CTX_end(ctx);
+#endif /* MONT_WORD */
 	return(retn);
 	}
-#endif /* MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
 
 BN_MONT_CTX *BN_MONT_CTX_new(void)
 	{
@@ -549,11 +394,7 @@
 	BN_init(&(ctx->RR));
 	BN_init(&(ctx->N));
 	BN_init(&(ctx->Ni));
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
 	ctx->n0[0] = ctx->n0[1] = 0;
-#else
-	ctx->n0 = 0;
-#endif
 	ctx->flags=0;
 	}
 
@@ -585,26 +426,22 @@
 		BIGNUM tmod;
 		BN_ULONG buf[2];
 
-		mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2;
-		BN_zero(R);
-#if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)",
-         only certain BN_BITS2<=32 platforms actually need this */
-		if (!(BN_set_bit(R,2*BN_BITS2))) goto err;	/* R */
-#else
-		if (!(BN_set_bit(R,BN_BITS2))) goto err;	/* R */
-#endif
-
-		buf[0]=mod->d[0]; /* tmod = N mod word size */
-		buf[1]=0;
-
 		BN_init(&tmod);
 		tmod.d=buf;
-		tmod.top = buf[0] != 0 ? 1 : 0;
 		tmod.dmax=2;
 		tmod.neg=0;
 
-#if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)";
-         only certain BN_BITS2<=32 platforms actually need this */
+		mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2;
+
+#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)
+		/* Only certain BN_BITS2<=32 platforms actually make use of
+		 * n0[1], and we could use the #else case (with a shorter R
+		 * value) for the others.  However, currently only the assembler
+		 * files do know which is which. */
+
+		BN_zero(R);
+		if (!(BN_set_bit(R,2*BN_BITS2))) goto err;
+
 								tmod.top=0;
 		if ((buf[0] = mod->d[0]))			tmod.top=1;
 		if ((buf[1] = mod->top>1 ? mod->d[1] : 0))	tmod.top=2;
@@ -632,6 +469,12 @@
 		mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
 		mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0;
 #else
+		BN_zero(R);
+		if (!(BN_set_bit(R,BN_BITS2))) goto err;	/* R */
+
+		buf[0]=mod->d[0]; /* tmod = N mod word size */
+		buf[1]=0;
+		tmod.top = buf[0] != 0 ? 1 : 0;
 							/* Ri = R^-1 mod N*/
 		if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
 			goto err;
@@ -647,12 +490,8 @@
 		if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
 		/* Ni = (R*Ri-1)/N,
 		 * keep only least significant word: */
-# if 0 /* for OpenSSL 0.9.9 mont->n0 */
 		mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
 		mont->n0[1] = 0;
-# else
-		mont->n0 = (Ri->top > 0) ? Ri->d[0] : 0;
-# endif
 #endif
 		}
 #else /* !MONT_WORD */
@@ -689,12 +528,8 @@
 	if (!BN_copy(&(to->N),&(from->N))) return NULL;
 	if (!BN_copy(&(to->Ni),&(from->Ni))) return NULL;
 	to->ri=from->ri;
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
 	to->n0[0]=from->n0[0];
 	to->n0[1]=from->n0[1];
-#else
-	to->n0=from->n0;
-#endif
 	return(to);
 	}