Security-57031.1.35.tar.gz

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

diff --git a/Security/libsecurity_apple_csp/lib/gladmanContext.h b/Security/libsecurity_apple_csp/lib/gladmanContext.h
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+/*
+ * Copyright (c) 2000-2001,2011,2013-2014 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.
+ */
+
+
+//
+// gladmanContext.h - Gladman AES context class
+//
+#ifndef _H_GLADMAN_CONTEXT
+#define _H_GLADMAN_CONTEXT
+
+#include <security_cdsa_plugin/CSPsession.h>
+#include "AppleCSP.h"
+#include "AppleCSPContext.h"
+#include "AppleCSPSession.h"
+#include "BlockCryptor.h"
+#include <CommonCrypto/CommonCryptor.h>
+#include <CommonCrypto/CommonCryptorSPI.h>
+#include "aesCommon.h"
+
+#define GLADMAN_BLOCK_SIZE_BYTES       DEFAULT_AES_BLOCK_BYTES
+
+/* Symmetric encryption context */
+class GAESContext : public BlockCryptor {
+public:
+       GAESContext(AppleCSPSession &session);
+       virtual ~GAESContext();
+       
+       // called by CSPFullPluginSession
+       void init(const Context &context, bool encoding = true);
+
+       // As an optimization, we allow reuse of a modified context. The main thing
+       // we avoid is a redundant key scheduling. We save the current raw keys bits
+       // in mRawKey and compare on re-init.
+       bool changed(const Context &context)     { return 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);
+       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);
+       
+private:
+       void deleteKey();
+       
+       /* scheduled key */
+    CCCryptorRef       mAesKey;        
+       bool                            mInitFlag;                      // for easy reuse
+       
+       /* 
+        * Raw key bits saved here and checked on re-init to avoid extra key 
+        * schedule on re-init. We also have to do a new key schedule if 
+        * changing between encrypting and decrypting since the key schedules
+        * differ for the two.
+        */
+       uint8                           mRawKey[MAX_AES_KEY_BITS / 8];
+       uint32                          mRawKeySize;
+       bool                            mWasEncrypting;
+};     /* AESContext */
+
+#endif //_H_GLADMAN_CONTEXT