t= &(ctx->bn[ctx->tos]);
t = BN_CTX_get(ctx);
int bn_mull(BIGNUM *r, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)	{	int top,i,j,k,al,bl;	BIGNUM *t;#ifdef BN_COUNTprintf("bn_mull %d * %d\n",a->top,b->top);#endif	bn_check_top(a);	bn_check_top(b);	bn_check_top(r);	al=a->top;	bl=b->top;	r->neg=a->neg^b->neg;	top=al+bl;	if ((al < 4) || (bl < 4))		{		if (bn_wexpand(r,top) == NULL) return(0);		r->top=top;		bn_mul_normal(r->d,a->d,al,b->d,bl);		goto end;		}	else if (al == bl) /* A good start, they are the same size */		goto symetric;	else		{		i=(al-bl);		if ((i ==  1) && !BN_get_flags(b,BN_FLG_STATIC_DATA))			{			bn_wexpand(b,al);			b->d[bl]=0;			bl++;			goto symetric;			}		else if ((i ==  -1) && !BN_get_flags(a,BN_FLG_STATIC_DATA))			{			bn_wexpand(a,bl);			a->d[al]=0;			al++;			goto symetric;			}		}	/* asymetric and >= 4 */ 	if (bn_wexpand(r,top) == NULL) return(0);	r->top=top;	bn_mul_normal(r->d,a->d,al,b->d,bl);	if (0)		{		/* symetric and > 4 */symetric:		if (al == 4)			{			if (bn_wexpand(r,al*2) == NULL) return(0);			r->top=top;			bn_mul_comba4(r->d,a->d,b->d);			goto end;			}		if (al == 8)			{			if (bn_wexpand(r,al*2) == NULL) return(0);			r->top=top;			bn_mul_comba8(r->d,a->d,b->d);			goto end;			}		if (al <= BN_MULL_NORMAL_SIZE)			{			if (bn_wexpand(r,al*2) == NULL) return(0);			r->top=top;			bn_mul_normal(r->d,a->d,al,b->d,bl);			goto end;			}		/* 16 or larger */		j=BN_num_bits_word((BN_ULONG)al);		j=1<<(j-1);		k=j+j;		t= &(ctx->bn[ctx->tos]);		if (al == j) /* exact multiple */			{			bn_wexpand(t,k*2);			bn_wexpand(r,k*2);			bn_mul_recursive(r->d,a->d,b->d,al,t->d);			}		else			{			bn_wexpand(a,k);			bn_wexpand(b,k);			bn_wexpand(t,k*4);			bn_wexpand(r,k*4);			for (i=a->top; i<k; i++)				a->d[i]=0;			for (i=b->top; i<k; i++)				b->d[i]=0;			bn_mul_part_recursive(r->d,a->d,b->d,al-j,j,t->d);			}		r->top=top;		}end:	bn_fix_top(r);	return(1);	}