Security-57336.1.9.tar.gz

[apple/security.git] / OSX / libsecurity_smime / lib / siginfoUtils.cpp

diff --git a/OSX/libsecurity_smime/lib/siginfoUtils.cpp b/OSX/libsecurity_smime/lib/siginfoUtils.cpp
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+/*
+ * Copyright (c) 2008,2011 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/* 
+ * siginfoUtils.cpp - private C++ routines for cmssiginfo
+ */
+ 
+#include <Security/SecCmsSignerInfo.h>
+#include <security_utilities/simpleprefs.h>
+#include "cmspriv.h"    /* prototype */
+
+/*
+ * RFC 3278 section section 2.1.1 states that the signatureAlgorithm 
+ * field contains the full ecdsa-with-SHA1 OID, not plain old ecPublicKey 
+ * as would appear in other forms of signed datas. However Microsoft doesn't 
+ * do this, it puts ecPublicKey there, and if we put ecdsa-with-SHA1 there, 
+ * MS can't verify - presumably because it takes the digest of the digest 
+ * before feeding it to ECDSA.
+ * We handle this with a preference; default if it's not there is 
+ * "Microsoft compatibility mode". 
+ */
+
+bool SecCmsMsEcdsaCompatMode()
+{
+       bool msCompat = true;
+       Dictionary *pd = Dictionary::CreateDictionary(kMSCompatibilityDomain, Dictionary::US_User, false);
+       if(pd == NULL) {
+           pd = Dictionary::CreateDictionary(kMSCompatibilityDomain, Dictionary::US_System, false);
+       }
+       if(pd != NULL) {
+           /* 
+            * not present means true, the opposite of getBoolValue(), so we have to see if 
+            * it's there...
+            */
+           if(pd->getValue(kMSCompatibilityMode)) {
+                       msCompat = pd->getBoolValue(kMSCompatibilityMode);
+           }
+           delete pd;
+       }
+       return msCompat;
+}
+