Improve bntest slightly, and fix another bug in the BN library.

CHANGES

@@ -4,6 +4,13 @@
 
  Changes between 0.9.4 and 0.9.5  [xx XXX 2000]
 
+  *) Bug fix for BN_div_recp() for numerators with an even number of
+     bits.
+     [Ulf Möller]
+
+  *) More tests in bntest.c, and changed test_bn output.
+     [Ulf Möller]
+
   *) ./config recognizes MacOS X now.
      [Andy Polyakov]
 

crypto/bn/bn_ctx.c

@@ -119,7 +119,7 @@ BIGNUM *BN_CTX_get(BN_CTX *ctx)
 		if (!ctx->too_many)
 			{
 			BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
-			/* disable error code until SSL_CTX_end is called: */
+			/* disable error code until BN_CTX_end is called: */
 			ctx->too_many = 1;
 			}
 		return NULL;

crypto/bn/bn_recp.c

@@ -158,6 +158,7 @@ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *m, BN_RECP_CTX *recp,
 	 *
 	 */
 	i=BN_num_bits(m);
+	if (i%2) i--;
 
 	j=recp->num_bits*2;
 	if (j > i)

crypto/bn/bntest.c

@@ -72,6 +72,10 @@
 #include "../bio/bss_file.c"
 #endif
 
+const num0 = 100; /* number of tests */
+const num1 = 50;  /* additional tests for some functions */
+const num2 = 5;   /* number of tests for slow functions */
+
 int test_add(BIO *bp);
 int test_sub(BIO *bp);
 int test_lshift1(BIO *bp);
@@ -100,6 +104,16 @@ static unsigned char lst[]="\xC6\x4F\x43\x04\x2A\xEA\xCA\x6E\x58\x36\x80\x5B\xE8
 
 static const char rnd_seed[] = "string to make the random number generator think it has entropy";
 
+void message(BIO *out, char *m)
+	{
+	fprintf(stderr, "test %s\n", m);
+#if 1
+	BIO_puts(out, "print \"test ");
+	BIO_puts(out, m);
+	BIO_puts(out, "\\n\"\n");
+#endif
+	}
+
 int main(int argc, char *argv[])
 	{
 	BN_CTX *ctx;
@@ -149,68 +163,68 @@ int main(int argc, char *argv[])
 	if (!results)
 		BIO_puts(out,"obase=16\nibase=16\n");
 
-	fprintf(stderr,"test BN_add\n");
+	message(out,"BN_add");
 	if (!test_add(out)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_sub\n");
+	message(out,"BN_sub");
 	if (!test_sub(out)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_lshift1\n");
+	message(out,"BN_lshift1");
 	if (!test_lshift1(out)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_lshift (fixed)\n");
+	message(out,"BN_lshift (fixed)");
 	if (!test_lshift(out,ctx,BN_bin2bn(lst,sizeof(lst)-1,NULL)))
 	    goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_lshift\n");
+	message(out,"BN_lshift");
 	if (!test_lshift(out,ctx,NULL)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_rshift1\n");
+	message(out,"BN_rshift1");
 	if (!test_rshift1(out)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_rshift\n");
+	message(out,"BN_rshift");
 	if (!test_rshift(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_sqr\n");
+	message(out,"BN_sqr");
 	if (!test_sqr(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_mul\n");
+	message(out,"BN_mul");
 	if (!test_mul(out)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_div\n");
+	message(out,"BN_div");
 	if (!test_div(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_div_recp\n");
+	message(out,"BN_div_recp");
 	if (!test_div_recp(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_mod\n");
+	message(out,"BN_mod");
 	if (!test_mod(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_mod_mul\n");
+	message(out,"BN_mod_mul");
 	if (!test_mod_mul(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_mont\n");
+	message(out,"BN_mont");
 	if (!test_mont(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_mod_exp\n");
+	message(out,"BN_mod_exp");
 	if (!test_mod_exp(out,ctx)) goto err;
 	fflush(stdout);
 
-	fprintf(stderr,"test BN_exp\n");
+	message(out,"BN_exp");
 	if (!test_exp(out,ctx)) goto err;
 	fflush(stdout);
 
@@ -222,7 +236,7 @@ int main(int argc, char *argv[])
 err:
 	BIO_puts(out,"1\n"); /* make sure bc fails if we are piping to it */
 	ERR_load_crypto_strings();
-	ERR_print_errors(out);
+	ERR_print_errors_fp(stderr);
 	exit(1);
 	return(1);
 	}
@@ -238,7 +252,7 @@ int test_add(BIO *bp)
 	BN_init(&c);
 
 	BN_rand(&a,512,0,0);
-	for (i=0; i<100; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_rand(&b,450+i,0,0);
 		a.neg=rand_neg();
@@ -265,7 +279,7 @@ int test_add(BIO *bp)
 		BN_add(&c,&c,&a);
 		if(!BN_is_zero(&c))
 		    {
-		    BIO_puts(bp,"Add test failed!\n");
+		    fprintf(stderr,"Add test failed!\n");
 		    return 0;
 		    }
 		}
@@ -285,12 +299,21 @@ int test_sub(BIO *bp)
 	BN_init(&b);
 	BN_init(&c);
 
-	BN_rand(&a,512,0,0);
-	for (i=0; i<100; i++)
+	for (i=0; i<num0+num1; i++)
 		{
-		BN_rand(&b,400+i,0,0);
-		a.neg=rand_neg();
-		b.neg=rand_neg();
+		if (i < num1)
+			{
+			BN_rand(&a,512,0,0);
+			BN_copy(&b,&a);
+			if (BN_set_bit(&a,i)==0) return(0);
+			BN_add_word(&b,i);
+			}
+		else
+			{
+			BN_rand(&b,400+i-num1,0,0);
+			a.neg=rand_neg();
+			b.neg=rand_neg();
+			}
 		if (bp == NULL)
 			for (j=0; j<10000; j++)
 				BN_sub(&c,&a,&b);
@@ -311,7 +334,7 @@ int test_sub(BIO *bp)
 		BN_sub(&c,&c,&a);
 		if(!BN_is_zero(&c))
 		    {
-		    BIO_puts(bp,"Subtract test failed!\n");
+		    fprintf(stderr,"Subtract test failed!\n");
 		    return 0;
 		    }
 		}
@@ -333,10 +356,17 @@ int test_div(BIO *bp, BN_CTX *ctx)
 	BN_init(&d);
 	BN_init(&e);
 
-	BN_rand(&a,400,0,0);
-	for (i=0; i<100; i++)
+	for (i=0; i<num0+num1; i++)
 		{
-		BN_rand(&b,50+i,0,0);
+		if (i < num1)
+			{
+			BN_rand(&a,400,0,0);
+			BN_copy(&b,&a);
+			BN_lshift(&a,&a,i);
+			BN_add_word(&a,i);
+			}
+		else
+			BN_rand(&b,50+3*(i-num1),0,0);
 		a.neg=rand_neg();
 		b.neg=rand_neg();
 		if (bp == NULL)
@@ -370,7 +400,7 @@ int test_div(BIO *bp, BN_CTX *ctx)
 		BN_sub(&d,&d,&a);
 		if(!BN_is_zero(&d))
 		    {
-		    BIO_puts(bp,"Division test failed!\n");
+		    fprintf(stderr,"Division test failed!\n");
 		    return 0;
 		    }
 		}
@@ -396,10 +426,17 @@ int test_div_recp(BIO *bp, BN_CTX *ctx)
 	BN_init(&d);
 	BN_init(&e);
 
-	BN_rand(&a,400,0,0);
-	for (i=0; i<100; i++)
+	for (i=0; i<num0+num1; i++)
 		{
-		BN_rand(&b,50+i,0,0);
+		if (i < num1)
+			{
+			BN_rand(&a,400,0,0);
+			BN_copy(&b,&a);
+			BN_lshift(&a,&a,i);
+			BN_add_word(&a,i);
+			}
+		else
+			BN_rand(&b,50+3*(i-num1),0,0);
 		a.neg=rand_neg();
 		b.neg=rand_neg();
 		BN_RECP_CTX_set(&recp,&b,ctx);
@@ -434,7 +471,12 @@ int test_div_recp(BIO *bp, BN_CTX *ctx)
 		BN_sub(&d,&d,&a);
 		if(!BN_is_zero(&d))
 		    {
-		    BIO_puts(bp,"Reciprocal division test failed!\n");
+		    fprintf(stderr,"Reciprocal division test failed!\n");
+		    fprintf(stderr,"a=");
+		    BN_print_fp(stderr,&a);
+		    fprintf(stderr,"\nb=");
+		    BN_print_fp(stderr,&b);
+		    fprintf(stderr,"\n");
 		    return 0;
 		    }
 		}
@@ -461,11 +503,15 @@ int test_mul(BIO *bp)
 	BN_init(&d);
 	BN_init(&e);
 
-	BN_rand(&a,200,0,0);
-	for (i=0; i<100; i++)
+	for (i=0; i<num0+num1; i++)
 		{
-		BN_rand(&b,250+i,0,0);
-		BN_rand(&b,200,0,0);
+		if (i < num1)
+			{
+			BN_rand(&a,100,0,0);
+			BN_rand(&b,100,0,0);
+			}
+		else
+			BN_rand(&b,i-num1,0,0);
 		a.neg=rand_neg();
 		b.neg=rand_neg();
 		if (bp == NULL)
@@ -488,7 +534,7 @@ int test_mul(BIO *bp)
 		BN_sub(&d,&d,&b);
 		if(!BN_is_zero(&d) || !BN_is_zero(&e))
 		    {
-		    BIO_puts(bp,"Multiplication test failed!\n");
+		    fprintf(stderr,"Multiplication test failed!\n");
 		    return 0;
 		    }
 		}
@@ -512,7 +558,7 @@ int test_sqr(BIO *bp, BN_CTX *ctx)
 	BN_init(&d);
 	BN_init(&e);
 
-	for (i=0; i<40; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_rand(&a,40+i*10,0,0);
 		a.neg=rand_neg();
@@ -536,7 +582,7 @@ int test_sqr(BIO *bp, BN_CTX *ctx)
 		BN_sub(&d,&d,&a);
 		if(!BN_is_zero(&d) || !BN_is_zero(&e))
 		    {
-		    BIO_puts(bp,"Square test failed!\n");
+		    fprintf(stderr,"Square test failed!\n");
 		    return 0;
 		    }
 		}
@@ -567,7 +613,7 @@ int test_mont(BIO *bp, BN_CTX *ctx)
 
 	BN_rand(&a,100,0,0); /**/
 	BN_rand(&b,100,0,0); /**/
-	for (i=0; i<10; i++)
+	for (i=0; i<num2; i++)
 		{
 		int bits = (100%BN_BITS2+1)*BN_BITS2*i*BN_BITS2;
 
@@ -608,7 +654,7 @@ BN_num_bits(mont->N));
 		BN_sub(&d,&d,&A);
 		if(!BN_is_zero(&d))
 		    {
-		    BIO_puts(bp,"Montgomery multiplication test failed!\n");
+		    fprintf(stderr,"Montgomery multiplication test failed!\n");
 		    return 0;
 		    }
 		}
@@ -636,7 +682,7 @@ int test_mod(BIO *bp, BN_CTX *ctx)
 	e=BN_new();
 
 	BN_rand(a,1024,0,0); /**/
-	for (i=0; i<20; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_rand(b,450+i*10,0,0); /**/
 		a->neg=rand_neg();
@@ -661,7 +707,7 @@ int test_mod(BIO *bp, BN_CTX *ctx)
 		BN_sub(e,e,c);
 		if(!BN_is_zero(e))
 		    {
-		    BIO_puts(bp,"Modulo test failed!\n");
+		    fprintf(stderr,"Modulo test failed!\n");
 		    return 0;
 		    }
 		}
@@ -685,9 +731,8 @@ int test_mod_mul(BIO *bp, BN_CTX *ctx)
 	e=BN_new();
 
 	BN_rand(c,1024,0,0); /**/
-	for (i=0; i<10; i++)
+	for (i=0; i<num0; i++)
 		{
-		BN_rand(a,475+i*10,0,0); /**/
 		BN_rand(b,425+i*10,0,0); /**/
 		a->neg=rand_neg();
 		b->neg=rand_neg();
@@ -723,7 +768,7 @@ int test_mod_mul(BIO *bp, BN_CTX *ctx)
 		BN_div(a,b,d,c,ctx);
 		if(!BN_is_zero(b))
 		    {
-		    BIO_puts(bp,"Modulo multiply test failed!\n");
+		    fprintf(stderr,"Modulo multiply test failed!\n");
 		    return 0;
 		    }
 		}
@@ -747,7 +792,7 @@ int test_mod_exp(BIO *bp, BN_CTX *ctx)
 	e=BN_new();
 
 	BN_rand(c,30,0,1); /* must be odd for montgomery */
-	for (i=0; i<6; i++)
+	for (i=0; i<num2; i++)
 		{
 		BN_rand(a,20+i*5,0,0); /**/
 		BN_rand(b,2+i,0,0); /**/
@@ -774,7 +819,7 @@ int test_mod_exp(BIO *bp, BN_CTX *ctx)
 		BN_div(a,b,e,c,ctx);
 		if(!BN_is_zero(b))
 		    {
-		    BIO_puts(bp,"Modulo exponentiation test failed!\n");
+		    fprintf(stderr,"Modulo exponentiation test failed!\n");
 		    return 0;
 		    }
 		}
@@ -798,7 +843,7 @@ int test_exp(BIO *bp, BN_CTX *ctx)
 	one=BN_new();
 	BN_one(one);
 
-	for (i=0; i<6; i++)
+	for (i=0; i<num2; i++)
 		{
 		BN_rand(a,20+i*5,0,0); /**/
 		BN_rand(b,2+i,0,0); /**/
@@ -824,7 +869,7 @@ int test_exp(BIO *bp, BN_CTX *ctx)
 		BN_sub(e,e,d);
 		if(!BN_is_zero(e))
 		    {
-		    BIO_puts(bp,"Exponentiation test failed!\n");
+		    fprintf(stderr,"Exponentiation test failed!\n");
 		    return 0;
 		    }
 		}
@@ -854,7 +899,7 @@ int test_lshift(BIO *bp,BN_CTX *ctx,BIGNUM *a_)
 	    BN_rand(a,200,0,0); /**/
 	    a->neg=rand_neg();
 	    }
-	for (i=0; i<70; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_lshift(b,a,i+1);
 		BN_add(c,c,c);
@@ -874,16 +919,16 @@ int test_lshift(BIO *bp,BN_CTX *ctx,BIGNUM *a_)
 		BN_sub(d,d,b);
 		if(!BN_is_zero(d))
 		    {
-		    BIO_puts(bp,"Left shift test failed!\n");
-		    BIO_puts(bp,"a=");
-		    BN_print(bp,a);
-		    BIO_puts(bp,"\nb=");
-		    BN_print(bp,b);
-		    BIO_puts(bp,"\nc=");
-		    BN_print(bp,c);
-		    BIO_puts(bp,"\nd=");
-		    BN_print(bp,d);
-		    BIO_puts(bp,"\n");
+		    fprintf(stderr,"Left shift test failed!\n");
+		    fprintf(stderr,"a=");
+		    BN_print_fp(stderr,a);
+		    fprintf(stderr,"\nb=");
+		    BN_print_fp(stderr,b);
+		    fprintf(stderr,"\nc=");
+		    BN_print_fp(stderr,c);
+		    fprintf(stderr,"\nd=");
+		    BN_print_fp(stderr,d);
+		    fprintf(stderr,"\n");
 		    return 0;
 		    }
 		}
@@ -905,7 +950,7 @@ int test_lshift1(BIO *bp)
 
 	BN_rand(a,200,0,0); /**/
 	a->neg=rand_neg();
-	for (i=0; i<70; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_lshift1(b,a);
 		if (bp != NULL)
@@ -923,7 +968,7 @@ int test_lshift1(BIO *bp)
 		BN_sub(a,b,c);
 		if(!BN_is_zero(a))
 		    {
-		    BIO_puts(bp,"Left shift one test failed!\n");
+		    fprintf(stderr,"Left shift one test failed!\n");
 		    return 0;
 		    }
 		
@@ -949,7 +994,7 @@ int test_rshift(BIO *bp,BN_CTX *ctx)
 
 	BN_rand(a,200,0,0); /**/
 	a->neg=rand_neg();
-	for (i=0; i<70; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_rshift(b,a,i+1);
 		BN_add(c,c,c);
@@ -969,7 +1014,7 @@ int test_rshift(BIO *bp,BN_CTX *ctx)
 		BN_sub(d,d,b);
 		if(!BN_is_zero(d))
 		    {
-		    BIO_puts(bp,"Right shift test failed!\n");
+		    fprintf(stderr,"Right shift test failed!\n");
 		    return 0;
 		    }
 		}
@@ -992,7 +1037,7 @@ int test_rshift1(BIO *bp)
 
 	BN_rand(a,200,0,0); /**/
 	a->neg=rand_neg();
-	for (i=0; i<70; i++)
+	for (i=0; i<num0; i++)
 		{
 		BN_rshift1(b,a);
 		if (bp != NULL)
@@ -1010,7 +1055,7 @@ int test_rshift1(BIO *bp)
 		BN_sub(c,c,b);
 		if(!BN_is_zero(c) && !BN_is_one(c))
 		    {
-		    BIO_puts(bp,"Right shift one test failed!\n");
+		    fprintf(stderr,"Right shift one test failed!\n");
 		    return 0;
 		    }
 		BN_copy(a,b);

doc/crypto/BN_mod_mul_reciprocal.pod

@@ -16,6 +16,9 @@ reciprocal
 
  int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *m, BN_CTX *ctx);
 
+ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *a, BN_RECP_CTX *recp,
+        BN_CTX *ctx);
+
  int BN_mod_mul_reciprocal(BIGNUM *r, BIGNUM *a, BIGNUM *b,
         BN_RECP_CTX *recp, BN_CTX *ctx);
 
@@ -33,9 +36,13 @@ BN_RECP_CTX_init() initializes an existing uninitialized B<BN_RECP>.
 BN_RECP_CTX_free() frees the components of the B<BN_RECP>, and, if it
 was created by BN_RECP_CTX_new(), also the structure itself.
 
-BN_RECP_CTX_set() computes 1/B<m> and shifts it left by
-BN_num_bits(B<m>)+1 to make it an integer. The result and the
-number of bits it was shifted left are stored in B<recp>.
+BN_RECP_CTX_set() stores B<m> in B<recp> and sets it up for computing
+1/B<m> and shifting it left by BN_num_bits(B<m>)+1 to make it an
+integer. The result and the number of bits it was shifted left will
+later be stored in B<recp>.
+
+BN_div_recp() divides B<a> by B<m> using B<recp>. It places the quotient
+in B<dv> and the remainder in B<rem>.
 
 The B<BN_RECP_CTX> structure is defined as follows:
 

test/Makefile.ssl

@@ -13,6 +13,7 @@ INSTALLTOP=	/usr/local/ssl
 MAKEFILE=	Makefile.ssl
 MAKE=		make -f $(MAKEFILE)
 MAKEDEPEND=	$(TOP)/util/domd $(TOP)
+PERL=		perl
 
 PEX_LIBS=
 EX_LIBS= #-lnsl -lsocket
@@ -180,14 +181,10 @@ test_pkcs7:
 
 test_bn:
 	@echo starting big number library test, could take a while...
-# This *should* work:
-#	@(./$(BNTEST)|bc) | awk '{ \
-# Some broken bc's treat the pipe as a terminal :-(
-# By using a temporary file, errors detected by awk may be farther away from
-# the test that caused them; but even with the pipe there'd be some distance.
-	@(./$(BNTEST) >tmp.bntest; echo quit >>tmp.bntest; bc tmp.bntest) | awk '{ \
-if ($$0 != "0") {print "error"; exit(1); } \
-if (((NR+1)%64) == 0) print NR+1," tests done"; }'
+	@./$(BNTEST) >tmp.bntest
+	@echo quit >>tmp.bntest
+	@echo "running bc"
+	@bc tmp.bntest 2>&1 | $(PERL) -e 'while (<STDIN>) {if (/^test (.*)/) {print STDERR "\nverify $$1";} elsif (!/^0$$/) {die "\nFailed! bc: $$_";} print STDERR "."; $$i++;} print STDERR "\n$$i tests passed\n"'
 	@echo 'test a^b%c implementations'
 	./$(EXPTEST)