Montgomery-related minor cleanups/documentation

Configure

@@ -1268,11 +1268,11 @@ if ($ranlib eq "")
 $cpuid_obj="" if ($processor eq "386");
 
 $bn_obj = $bn_asm unless $bn_obj ne "";
-# bn86* is the only one implementing bn_*_part_words
-$cflags.=" -DOPENSSL_BN_ASM_PART_WORDS" if ($bn_obj =~ /bn(86|-586)/);
+# bn-586 is the only one implementing bn_*_part_words
+$cflags.=" -DOPENSSL_BN_ASM_PART_WORDS" if ($bn_obj =~ /bn-586/);
 $cflags.=" -DOPENSSL_IA32_SSE2" if (!$no_sse2 && $bn_obj =~ /86/);
 
-$cflags.=" -DOPENSSL_BN_ASM_MONT" if ($bn_obj =~ /\-mont|mo86\-/);
+$cflags.=" -DOPENSSL_BN_ASM_MONT" if ($bn_obj =~ /-mont/);
 
 $cpuid_obj="mem_clr.o"	unless ($cpuid_obj =~ /\.o$/);
 $des_obj=$des_enc	unless ($des_obj =~ /\.o$/);

crypto/bn/bn.h

@@ -315,7 +315,8 @@ struct bn_mont_ctx_st
 	BIGNUM N;      /* The modulus */
 	BIGNUM Ni;     /* R*(1/R mod N) - N*Ni = 1
 	                * (Ni is only stored for bignum algorithm) */
-	BN_ULONG n0[2];/* least significant word(s) of Ni */
+	BN_ULONG n0[2];/* least significant word(s) of Ni;
+	                  (type changed with 0.9.9, was "BN_ULONG n0;" before) */
 	int flags;
 	};
 

crypto/bn/bn_mont.c

@@ -394,6 +394,7 @@ void BN_MONT_CTX_init(BN_MONT_CTX *ctx)
 	BN_init(&(ctx->RR));
 	BN_init(&(ctx->N));
 	BN_init(&(ctx->Ni));
+	ctx->n0[0] = ctx->n0[1] = 0;
 	ctx->flags=0;
 	}