Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_apple_csp / lib / NullCryptor.h

diff --git a/Security/libsecurity_apple_csp/lib/NullCryptor.h b/Security/libsecurity_apple_csp/lib/NullCryptor.h
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+/*
+ * Copyright (c) 2000-2001,2011,2014 Apple 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.
+ */
+
+
+/*
+ * NullCryptor.h - null symmetric encryptor for measurement only
+ */
+#ifndef _NULL_CRYPTOR_H_
+#define _NULL_CRYPTOR_H_
+
+/*
+ * DO NOT DEFINE THIS SYMBOL TRUE FOR CODE CHECKED IN TO CVS
+ */
+#define NULL_CRYPT_ENABLE                      0
+
+#if            NULL_CRYPT_ENABLE
+
+#include <security_cdsa_plugin/CSPsession.h>
+#include "AppleCSP.h"
+#include "AppleCSPContext.h"
+#include "AppleCSPSession.h"
+#include "BlockCryptor.h"
+
+#define NULL_CRYPT_BLOCK_SIZE          16
+
+class NullCryptor : public BlockCryptor {
+public:
+       NullCryptor(AppleCSPSession &session) :
+               BlockCryptor(session),
+               mInitFlag(false)        { }
+       ~NullCryptor() { }
+       
+       // called by CSPFullPluginSession
+       void init(const Context &context, bool encoding = true)
+       {
+               if(mInitFlag && !opStarted()) {
+                       return;
+               }
+               /* Just have BlockCryptor do its setup */
+               setup(NULL_CRYPT_BLOCK_SIZE, context);
+               mInitFlag = true;
+       }
+
+       // called by BlockCryptor
+       void encryptBlock(
+               const void              *plainText,                     // length implied (one block)
+               size_t                  plainTextLen,
+               void                    *cipherText,    
+               size_t                  &cipherTextLen,         // in/out, throws on overflow
+               bool                    final)
+       {
+               memmove(cipherText, plainText, NULL_CRYPT_BLOCK_SIZE);
+               cipherTextLen = NULL_CRYPT_BLOCK_SIZE;
+       }
+       
+       void decryptBlock(
+               const void              *cipherText,            // length implied (one cipher block)
+               size_t                  cipherTextLen,
+               void                    *plainText,     
+               size_t                  &plainTextLen,          // in/out, throws on overflow
+               bool                    final)
+       {
+               memmove(plainText, cipherText, NULL_CRYPT_BLOCK_SIZE);
+               plainTextLen = NULL_CRYPT_BLOCK_SIZE;
+       }
+               
+private:
+       bool                            mInitFlag;                      // for easy reuse
+
+};     /* NullCryptor */
+
+#endif /* NULL_CRYPT_ENABLE */
+
+#endif //_NULL_CRYPTOR_H_