From: Martin Willi <martin@strongswan.org>
Subject: HMAC regression
Date: Thu, 28 May 2009 17:09:08 +0200
Message-ID: <1243523348.30487.89.camel@martin.hsr.ch>
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
To: Herbert Xu <herbert@gondor.apana.org.au>,
	linux-crypto@vger.kernel.org
Return-path: <linux-crypto-owner@vger.kernel.org>
Received: from zaes.ch ([213.133.111.41]:57933 "EHLO zaes.ch"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1759441AbZE1PnT (ORCPT <rfc822;linux-crypto@vger.kernel.org>);
	Thu, 28 May 2009 11:43:19 -0400
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Hi,

Switching the hash implementations to the new shash API introduced a
regression. HMACs are created incorrectly if the data is scattered over
multiple pages, resulting in very unreliable IPsec tunnels.

The appended patch adds a silly hmac(sha1) test vector larger than a 4KB
page and fails on current crypto-2.6. It runs successful when reverting
sha1 to the old hash API (54ccb367).

Data on the first page gets hashed correctly, but walking to the next
page fails. The new page does not get mapped and the remaining bytes are
read from the beginning of the first page, resulting in wrong MACs. I
did not fully understand the hash_walk code in ahash.c, but either the
length/offset calculation is wrong (when using compat functions) or the
scatterlist is not set up correctly.

Martin

---
 crypto/testmgr.h |  252 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 250 insertions(+), 2 deletions(-)

diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 526f00a..ab90006 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -32,7 +32,7 @@ struct hash_testvec {
 	char *plaintext;
 	char *digest;
 	unsigned char tap[MAX_TAP];
-	unsigned char psize;
+	unsigned int psize;
 	unsigned char np;
 	unsigned char ksize;
 };
@@ -1238,7 +1238,7 @@ static struct hash_testvec hmac_rmd160_tv_template[] = {
 /*
  * HMAC-SHA1 test vectors from RFC2202
  */
-#define HMAC_SHA1_TEST_VECTORS	7
+#define HMAC_SHA1_TEST_VECTORS	8
 
 static struct hash_testvec hmac_sha1_tv_template[] = {
 	{
@@ -1314,6 +1314,254 @@ static struct hash_testvec hmac_sha1_tv_template[] = {
 		.psize	= 73,
 		.digest	= "\xe8\xe9\x9d\x0f\x45\x23\x7d\x78\x6d\x6b"
 			  "\xba\xa7\x96\x5c\x78\x08\xbb\xff\x1a\x91",
+	}, {
+		.key	= "\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c",
+		.ksize	= 20,
+		.plaintext =
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90"
+"\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90\x12\x34\x56\x78\x90",
+		.psize	= 4100,
+		.digest	= "\x4F\x3B\x6B\xD1\x1A\x2E\xD6\x12\x3D\x5A\xC8\x39\x91\xE3\xC3\x0E\xB6\x51\x85\xA5",
 	},
 };
 
-- 
1.6.3.1