From 2b561cb0e87f2ee535e8c64907883cd275ad3fec Mon Sep 17 00:00:00 2001
From: deraadt <>
Date: Tue, 2 May 2017 03:59:45 +0000
Subject: use freezero() instead of memset/explicit_bzero + free. 
 Substantially reduces conditional logic (-218, +82).

MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH cache alignment calculation bn/bn_exp.c
wasn'tt quite right.  Two other tricky bits with ASN1_STRING_FLAG_NDEF and
BN_FLG_STATIC_DATA where the condition cannot be collapsed completely.

Passes regress.  ok beck
---
 src/lib/libcrypto/rsa/rsa_eay.c  | 22 +++++-----------------
 src/lib/libcrypto/rsa/rsa_saos.c | 10 +++-------
 src/lib/libcrypto/rsa/rsa_sign.c | 16 +++++-----------
 3 files changed, 13 insertions(+), 35 deletions(-)

(limited to 'src/lib/libcrypto/rsa')

diff --git a/src/lib/libcrypto/rsa/rsa_eay.c b/src/lib/libcrypto/rsa/rsa_eay.c
index f9f620ae23..6c3da0d656 100644
--- a/src/lib/libcrypto/rsa/rsa_eay.c
+++ b/src/lib/libcrypto/rsa/rsa_eay.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_eay.c,v 1.48 2017/04/28 22:46:40 beck Exp $ */
+/* $OpenBSD: rsa_eay.c,v 1.49 2017/05/02 03:59:45 deraadt Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -244,10 +244,7 @@ err:
 		BN_CTX_end(ctx);
 		BN_CTX_free(ctx);
 	}
-	if (buf != NULL) {
-		explicit_bzero(buf, num);
-		free(buf);
-	}
+	freezero(buf, num);
 	return r;
 }
 
@@ -468,10 +465,7 @@ err:
 		BN_CTX_end(ctx);
 		BN_CTX_free(ctx);
 	}
-	if (buf != NULL) {
-		explicit_bzero(buf, num);
-		free(buf);
-	}
+	freezero(buf, num);
 	return r;
 }
 
@@ -597,10 +591,7 @@ err:
 		BN_CTX_end(ctx);
 		BN_CTX_free(ctx);
 	}
-	if (buf != NULL) {
-		explicit_bzero(buf, num);
-		free(buf);
-	}
+	freezero(buf, num);
 	return r;
 }
 
@@ -700,10 +691,7 @@ err:
 		BN_CTX_end(ctx);
 		BN_CTX_free(ctx);
 	}
-	if (buf != NULL) {
-		explicit_bzero(buf, num);
-		free(buf);
-	}
+	freezero(buf, num);
 	return r;
 }
 
diff --git a/src/lib/libcrypto/rsa/rsa_saos.c b/src/lib/libcrypto/rsa/rsa_saos.c
index 10184b6c18..e1fbdcb5df 100644
--- a/src/lib/libcrypto/rsa/rsa_saos.c
+++ b/src/lib/libcrypto/rsa/rsa_saos.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_saos.c,v 1.22 2017/04/28 22:46:40 beck Exp $ */
+/* $OpenBSD: rsa_saos.c,v 1.23 2017/05/02 03:59:45 deraadt Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -96,8 +96,7 @@ RSA_sign_ASN1_OCTET_STRING(int type, const unsigned char *m, unsigned int m_len,
 	else
 		*siglen = i;
 
-	explicit_bzero(s, (unsigned int)j + 1);
-	free(s);
+	freezero(s, (unsigned int)j + 1);
 	return ret;
 }
 
@@ -137,9 +136,6 @@ RSA_verify_ASN1_OCTET_STRING(int dtype, const unsigned char *m,
 		ret = 1;
 err:
 	ASN1_OCTET_STRING_free(sig);
-	if (s != NULL) {
-		explicit_bzero(s, (unsigned int)siglen);
-		free(s);
-	}
+	freezero(s, (unsigned int)siglen);
 	return ret;
 }
diff --git a/src/lib/libcrypto/rsa/rsa_sign.c b/src/lib/libcrypto/rsa/rsa_sign.c
index 818b88c604..6e9e869f0a 100644
--- a/src/lib/libcrypto/rsa/rsa_sign.c
+++ b/src/lib/libcrypto/rsa/rsa_sign.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_sign.c,v 1.28 2017/04/28 22:46:40 beck Exp $ */
+/* $OpenBSD: rsa_sign.c,v 1.29 2017/05/02 03:59:45 deraadt Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -135,10 +135,8 @@ RSA_sign(int type, const unsigned char *m, unsigned int m_len,
 	else
 		*siglen = i;
 
-	if (type != NID_md5_sha1) {
-		explicit_bzero(tmps, (unsigned int)j + 1);
-		free(tmps);
-	}
+	if (type != NID_md5_sha1)
+		freezero(tmps, (unsigned int)j + 1);
 	return (ret);
 }
 
@@ -232,12 +230,8 @@ int_rsa_verify(int dtype, const unsigned char *m, unsigned int m_len,
 			ret = 1;
 	}
 err:
-	if (sig != NULL)
-		X509_SIG_free(sig);
-	if (s != NULL) {
-		explicit_bzero(s, (unsigned int)siglen);
-		free(s);
-	}
+	X509_SIG_free(sig);
+	freezero(s, (unsigned int)siglen);
 	return ret;
 }
 
-- 
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