Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_codesigning / lib / reqreader.cpp

diff --git a/Security/libsecurity_codesigning/lib/reqreader.cpp b/Security/libsecurity_codesigning/lib/reqreader.cpp
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+/*
+ * Copyright (c) 2007,2011 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@
+ */
+
+//
+// reqreader - Requirement language (exprOp) reader/scanner
+//
+#include "reqreader.h"
+#include <Security/SecTrustSettingsPriv.h>
+#include <security_utilities/memutils.h>
+#include <security_cdsa_utilities/cssmdata.h>  // for hex encoding
+#include "csutilities.h"
+
+namespace Security {
+namespace CodeSigning {
+
+
+//
+// Requirement::Reader
+//
+Requirement::Reader::Reader(const Requirement *req)
+       : mReq(req), mPC(sizeof(Requirement))
+{
+       assert(req);
+       if (req->kind() != exprForm)
+               MacOSError::throwMe(errSecCSReqUnsupported);
+}
+
+
+//
+// Access helpers to retrieve various data types from the data stream
+//
+void Requirement::Reader::getData(const void *&data, size_t &length)
+{
+       length = get<uint32_t>();
+       checkSize(length);
+       data = (mReq->at<void>(mPC));
+       mPC += LowLevelMemoryUtilities::alignUp(length, baseAlignment);
+}
+
+string Requirement::Reader::getString()
+{
+       const char *s; size_t length;
+       getData(s, length);
+       return string(s, length);
+}
+
+const unsigned char *Requirement::Reader::getHash()
+{
+       const unsigned char *s; size_t length;
+       getData(s, length);
+       if (length != SHA1::digestLength)
+               MacOSError::throwMe(errSecCSReqInvalid);
+       return s;
+}
+
+const unsigned char *Requirement::Reader::getSHA1()
+{
+       const unsigned char *digest; size_t length;
+       getData(digest, length);
+       if (length != CC_SHA1_DIGEST_LENGTH)
+               MacOSError::throwMe(errSecCSReqInvalid);
+       return digest;
+}
+
+void Requirement::Reader::skip(size_t length)
+{
+       checkSize(length);
+       mPC += length;
+}
+
+
+}      // CodeSigning
+}      // Security