another round of chemo for the RAND code to provide clarity.

ok deraadt

1 files changed, 79 insertions, 159 deletions

diff --git a/lib/libcrypto/rand/rand_lib.c b/lib/libcrypto/rand/rand_lib.c
index 243a87ddfbd..6d61b3d3f62 100644
--- a/lib/libcrypto/rand/rand_lib.c
+++ b/lib/libcrypto/rand/rand_lib.c
@@ -1,177 +1,97 @@
-/* crypto/rand/rand_lib.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
  *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- * 
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to.  The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- * 
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *    "This product includes cryptographic software written by
- *     Eric Young (eay@cryptsoft.com)"
- *    The word 'cryptographic' can be left out if the rouines from the library
- *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from 
- *    the apps directory (application code) you must include an acknowledgement:
- *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- * 
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * 
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed.  i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-
-#include <stdio.h>
-#include <time.h>
 #include "cryptlib.h"
 #include <openssl/rand.h>
 
-#ifndef OPENSSL_NO_ENGINE
-#include <openssl/engine.h>
-#endif
+#include <stdlib.h>
 
-#ifndef OPENSSL_NO_ENGINE
-/* non-NULL if default_RAND_meth is ENGINE-provided */
-static ENGINE *funct_ref =NULL;
-#endif
-static const RAND_METHOD *default_RAND_meth = NULL;
-
-int RAND_set_rand_method(const RAND_METHOD *meth)
-	{
-#ifndef OPENSSL_NO_ENGINE
-	if(funct_ref)
-		{
-		ENGINE_finish(funct_ref);
-		funct_ref = NULL;
-		}
-#endif
-	default_RAND_meth = meth;
+/*
+ * The useful functions in this file are at the bottom.
+ */
+int
+RAND_set_rand_method(const RAND_METHOD *meth)
+{
 	return 1;
-	}
+}
 
-const RAND_METHOD *RAND_get_rand_method(void)
-	{
-	if (!default_RAND_meth)
-		{
-#ifndef OPENSSL_NO_ENGINE
-		ENGINE *e = ENGINE_get_default_RAND();
-		if(e)
-			{
-			default_RAND_meth = ENGINE_get_RAND(e);
-			if(!default_RAND_meth)
-				{
-				ENGINE_finish(e);
-				e = NULL;
-				}
-			}
-		if(e)
-			funct_ref = e;
-		else
-#endif
-			default_RAND_meth = RAND_SSLeay();
-		}
-	return default_RAND_meth;
-	}
+const RAND_METHOD *
+RAND_get_rand_method(void)
+{
+	return NULL;
+}
+
+RAND_METHOD *
+RAND_SSLeay(void)
+{
+	return NULL;
+}
 
 #ifndef OPENSSL_NO_ENGINE
-int RAND_set_rand_engine(ENGINE *engine)
-	{
-	const RAND_METHOD *tmp_meth = NULL;
-	if(engine)
-		{
-		if(!ENGINE_init(engine))
-			return 0;
-		tmp_meth = ENGINE_get_RAND(engine);
-		if(!tmp_meth)
-			{
-			ENGINE_finish(engine);
-			return 0;
-			}
-		}
-	/* This function releases any prior ENGINE so call it first */
-	RAND_set_rand_method(tmp_meth);
-	funct_ref = engine;
+int
+RAND_set_rand_engine(ENGINE *engine)
+{
 	return 1;
-	}
+}
 #endif
 
-void RAND_cleanup(void)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->cleanup)
-		meth->cleanup();
-	RAND_set_rand_method(NULL);
-	}
+void
+RAND_cleanup(void)
+{
+
+}
+
+void
+RAND_seed(const void *buf, int num)
+{
+
+}
 
-void RAND_seed(const void *buf, int num)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->seed)
-		meth->seed(buf,num);
-	}
+void
+RAND_add(const void *buf, int num, double entropy)
+{
 
-void RAND_add(const void *buf, int num, double entropy)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->add)
-		meth->add(buf,num,entropy);
-	}
+}
 
-int RAND_bytes(unsigned char *buf, int num)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->bytes)
-		return meth->bytes(buf,num);
-	return(-1);
-	}
+int
+RAND_status(void)
+{
+	return 1;
+}
 
-int RAND_pseudo_bytes(unsigned char *buf, int num)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->pseudorand)
-		return meth->pseudorand(buf,num);
-	return(-1);
-	}
+int
+RAND_poll(void)
+{
+       return 1;
+}
 
-int RAND_status(void)
-	{
-	const RAND_METHOD *meth = RAND_get_rand_method();
-	if (meth && meth->status)
-		return meth->status();
-	return 0;
-	}
+/*
+ * Hurray. You've made it to the good parts.
+ */
+int
+RAND_bytes(unsigned char *buf, int num)
+{
+	if (num > 0)
+		arc4random_buf(buf, num);
+	return 1;
+}
+
+int
+RAND_pseudo_bytes(unsigned char *buf, int num)
+{
+	if (num > 0)
+		arc4random_buf(buf, num);
+	return 1;
+}