Security-55163.44.tar.gz

[apple/security.git] / libsecurity_apple_csp / lib / AppleCSPKeys.cpp

diff --git a/libsecurity_apple_csp/lib/AppleCSPKeys.cpp b/libsecurity_apple_csp/lib/AppleCSPKeys.cpp
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+++ b/libsecurity_apple_csp/lib/AppleCSPKeys.cpp
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+/*
+ * Copyright (c) 2003 Apple Computer, Inc. All Rights Reserved.
+ * 
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please 
+ * obtain a copy of the License at http://www.apple.com/publicsource and 
+ * read it before using this file.
+ * 
+ * This 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.
+ */
+/*
+ * AppleCSPKeys.cpp - Key support
+ */
+ 
+#include "AppleCSPKeys.h"
+#include "AppleCSPUtils.h"
+/*
+ * CSPKeyInfoProvider for symmetric keys. 
+ */
+CSPKeyInfoProvider *SymmetricKeyInfoProvider::provider(
+               const CssmKey   &cssmKey,
+               AppleCSPSession &session)
+{
+       if(cssmKey.blobType() != CSSM_KEYBLOB_RAW) {
+               errorLog0("KeyInfoProvider deals only with RAW keys!\n");
+               CssmError::throwMe(CSSMERR_CSP_INTERNAL_ERROR);
+       }
+       if(cssmKey.keyClass() != CSSM_KEYCLASS_SESSION_KEY) {
+               /* that's all we need to know */
+               return NULL;
+       }
+       return new SymmetricKeyInfoProvider(cssmKey, session);
+}
+ 
+SymmetricKeyInfoProvider::SymmetricKeyInfoProvider(
+       const CssmKey   &cssmKey,
+       AppleCSPSession &session) :
+               CSPKeyInfoProvider(cssmKey, session)
+{
+}
+
+/* cook up a Binary key */
+void SymmetricKeyInfoProvider::CssmKeyToBinary(
+       CssmKey                         *paramKey,      // ignored
+       CSSM_KEYATTR_FLAGS      &attrFlags,     // IN/OUT
+       BinaryKey                       **binKey)
+{
+       CASSERT(mKey.keyClass() == CSSM_KEYCLASS_SESSION_KEY);
+       SymmetricBinaryKey *symBinKey = new SymmetricBinaryKey(
+               mKey.KeyHeader.LogicalKeySizeInBits);
+       copyCssmData(mKey, 
+               symBinKey->mKeyData, 
+               symBinKey->mAllocator);
+       *binKey = symBinKey;
+}
+
+/* obtain key size in bits */
+void SymmetricKeyInfoProvider::QueryKeySizeInBits(
+       CSSM_KEY_SIZE &keySize)
+{
+       /* FIXME - do we ever need to calculate RC2 effective size here? */
+       keySize.LogicalKeySizeInBits = keySize.EffectiveKeySizeInBits =
+               mKey.length() * 8;
+}
+
+/* 
+ * Obtain blob suitable for hashing in CSSM_APPLECSP_KEYDIGEST 
+ * passthrough.
+ */
+bool SymmetricKeyInfoProvider::getHashableBlob(
+       Allocator       &allocator,
+       CssmData                &blob)                  // blob to hash goes here
+{
+       /*
+        * This is trivial: the raw key is already in the "proper" format.
+        */
+       assert(mKey.blobType() == CSSM_KEYBLOB_RAW);
+       const CssmData &keyBlob = CssmData::overlay(mKey.KeyData);
+       copyCssmData(keyBlob, blob, allocator);
+       return true;
+}
+