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Annotation of truecrypt/volume/cipher.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.
                      3: 
                      4:  Governed by the TrueCrypt License 2.4 the full text of which is contained
                      5:  in the file License.txt included in TrueCrypt binary and source code
                      6:  distribution packages.
                      7: */
                      8: 
                      9: #ifndef TC_HEADER_Encryption_Ciphers
                     10: #define TC_HEADER_Encryption_Ciphers
                     11: 
                     12: #include "Platform/Platform.h"
                     13: 
                     14: 
                     15: namespace TrueCrypt
                     16: {
                     17:        class Cipher;
                     18:        typedef vector < shared_ptr <Cipher> > CipherList;
                     19: 
                     20:        class Cipher
                     21:        {
                     22:        public:
                     23:                virtual ~Cipher ();
                     24: 
                     25:                virtual void DecryptBlock (byte *data) const;
                     26:                virtual void EncryptBlock (byte *data) const;
                     27:                static CipherList GetAvailableCiphers ();
                     28:                virtual size_t GetBlockSize () const = 0;
                     29:                virtual size_t GetKeySize () const = 0;
                     30:                virtual wstring GetName () const = 0;
                     31:                virtual shared_ptr <Cipher> GetNew () const = 0;
                     32:                virtual void SetKey (const ConstBufferPtr &key);
                     33: 
                     34:                static const int MaxBlockSize = 16;
                     35: 
                     36:        protected:
                     37:                Cipher ();
                     38: 
                     39:                virtual void Decrypt (byte *data) const = 0;
                     40:                virtual void Encrypt (byte *data) const = 0;
                     41:                virtual size_t GetScheduledKeySize () const = 0;
                     42:                virtual void SetCipherKey (const byte *key) = 0;
                     43: 
                     44:                bool Initialized;
                     45:                SecureBuffer ScheduledKey;
                     46: 
                     47:        private:
                     48:                Cipher (const Cipher &);
                     49:                Cipher &operator= (const Cipher &);
                     50:        };
                     51: 
                     52:        struct CipherException : public Exception
                     53:        {
                     54:        protected:
                     55:                CipherException () { }
                     56:                CipherException (const string &message) : Exception (message) { }
                     57:                CipherException (const string &message, const wstring &subject) : Exception (message, subject) { }
                     58:        };
                     59: 
                     60: 
                     61: #define TC_CIPHER(NAME, BLOCK_SIZE, KEY_SIZE) \
                     62:        class TC_JOIN (Cipher,NAME) : public Cipher \
                     63:        { \
                     64:        public: \
                     65:                TC_JOIN (Cipher,NAME) () { } \
                     66:                virtual ~TC_JOIN (Cipher,NAME) () { } \
                     67: \
                     68:                virtual size_t GetBlockSize () const { return BLOCK_SIZE; }; \
                     69:                virtual size_t GetKeySize () const { return KEY_SIZE; }; \
                     70:                virtual wstring GetName () const { return L###NAME; }; \
                     71:                virtual shared_ptr <Cipher> GetNew () const { return shared_ptr <Cipher> (new TC_JOIN (Cipher,NAME)()); } \
                     72: \
                     73:        protected: \
                     74:                virtual void Decrypt (byte *data) const; \
                     75:                virtual void Encrypt (byte *data) const; \
                     76:                virtual size_t GetScheduledKeySize () const; \
                     77:                virtual void SetCipherKey (const byte *key); \
                     78: \
                     79:        private: \
                     80:                TC_JOIN (Cipher,NAME) (const TC_JOIN (Cipher,NAME) &); \
                     81:                TC_JOIN (Cipher,NAME) &operator= (const TC_JOIN (Cipher,NAME) &); \
                     82:        }
                     83:        
                     84:        TC_CIPHER (AES, 16, 32);
                     85:        TC_CIPHER (Blowfish, 8, 56);
                     86:        TC_CIPHER (Cast5, 8, 16);
                     87:        TC_CIPHER (Serpent, 16, 32);
                     88:        TC_CIPHER (TripleDES, 8, 24);
                     89:        TC_CIPHER (Twofish, 16, 32);
                     90: 
                     91: #undef TC_CIPHER
                     92: 
                     93:        
                     94: #define TC_EXCEPTION(NAME) TC_EXCEPTION_DECL(NAME,CipherException)
                     95: 
                     96: #undef TC_EXCEPTION_SET
                     97: #define TC_EXCEPTION_SET \
                     98:        TC_EXCEPTION (CipherInitError); \
                     99:        TC_EXCEPTION (WeakKeyDetected);
                    100: 
                    101:        TC_EXCEPTION_SET;
                    102: 
                    103: #undef TC_EXCEPTION
                    104: }
                    105: 
                    106: #endif // TC_HEADER_Encryption_Ciphers

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