- Pseudo-seed the PRNG in programs used for "make test"

because otherwise BN_rand will fail unless DEVRANDOM works,
  which causes the programs to dump core because they
  don't check the return value of BN_rand (and if they
  did, we still couldn't test anything).

- add comment to some files that appear not to be used at all.

crypto/bn/bn_opts.c

@@ -1,4 +1,6 @@
-/* crypto/bn/expspeed.c */
+/* unused */
+
+/* crypto/bn/bn_opts.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *

crypto/bn/bnspeed.c

@@ -1,3 +1,5 @@
+/* unused */
+
 /* crypto/bn/bnspeed.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.

crypto/bn/bntest.c

@@ -98,6 +98,8 @@ static int results=0;
 static unsigned char lst1[]="\xC6\x4F\x43\x04\x2A\xEA\xCA\x6E\x58\x36\x80\x5B\xE8\xC9"
 "\x9B\x04\x5D\x48\x36\xC2\xFD\x16\xC9\x64\xF0";
 
+static const char rnd_seed[] = "string to make the random number generator think it has entropy";
+
 int main(int argc, char *argv[])
 	{
 	BN_CTX *ctx;
@@ -106,6 +108,10 @@ int main(int argc, char *argv[])
 
 	results = 0;
 
+	RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't
+	                                       * even check its return value
+	                                       * (which we should) */
+
 	argc--;
 	argv++;
 	while (argc >= 1)

crypto/bn/d.c

@@ -1,3 +1,5 @@
+/* unused */
+
 #include <stdio.h>
 #include <openssl/bio.h>
 #include "bn_lcl.h"

crypto/bn/exp.c

@@ -1,3 +1,5 @@
+/* unused */
+
 #include <stdio.h>
 #include <openssl/tmdiff.h>
 #include "bn_lcl.h"

crypto/bn/expspeed.c

@@ -1,3 +1,5 @@
+/* unused */
+
 /* crypto/bn/expspeed.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.

crypto/bn/exptest.c

@@ -69,6 +69,8 @@
 
 #define NUM_BITS	(BN_BITS*2)
 
+static const char rnd_seed[] = "string to make the random number generator think it has entropy";
+
 int main(int argc, char *argv[])
 	{
 	BN_CTX *ctx;
@@ -77,6 +79,10 @@ int main(int argc, char *argv[])
 	unsigned char c;
 	BIGNUM *r_mont,*r_recp,*r_simple,*a,*b,*m;
 
+	RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't
+	                                       * even check its return value
+	                                       * (which we should) */
+
 	ERR_load_BN_strings();
 
 	ctx=BN_CTX_new();

crypto/bn/test.c

@@ -1,3 +1,5 @@
+/* unused */
+
 #include <stdio.h>
 #include "cryptlib.h"
 #include "bn_lcl.h"