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155 lines
4 KiB
C++
155 lines
4 KiB
C++
/*
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Copyright (C) 2000-2007 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301 USA.
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*/
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/* modes.hpp provides ECB and CBC modes for block cipher encryption/decryption
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*/
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#ifndef TAO_CRYPT_MODES_HPP
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#define TAO_CRYPT_MODES_HPP
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#include "misc.hpp"
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namespace TaoCrypt {
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enum Mode { ECB, CBC };
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// BlockCipher abstraction
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template<CipherDir DIR, class T, Mode MODE>
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class BlockCipher {
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public:
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BlockCipher() : cipher_(DIR, MODE) {}
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void Process(byte* c, const byte* p, word32 sz)
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{ cipher_.Process(c, p, sz); }
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void SetKey(const byte* k, word32 sz)
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{ cipher_.SetKey(k, sz, DIR); }
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void SetKey(const byte* k, word32 sz, const byte* iv_arg)
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{ cipher_.SetKey(k, sz, DIR); cipher_.SetIV(iv_arg); }
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private:
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T cipher_;
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BlockCipher(const BlockCipher&); // hide copy
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BlockCipher& operator=(const BlockCipher&); // and assign
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};
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// Mode Base for block ciphers, static size
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class Mode_BASE : public virtual_base {
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public:
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enum { MaxBlockSz = 16 };
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explicit Mode_BASE(int sz, CipherDir dir, Mode mode)
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: blockSz_(sz), reg_(reinterpret_cast<byte*>(r_)),
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tmp_(reinterpret_cast<byte*>(t_)), dir_(dir), mode_(mode)
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{
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assert(sz <= MaxBlockSz);
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}
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virtual ~Mode_BASE() {}
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virtual void Process(byte*, const byte*, word32);
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void SetIV(const byte* iv) { memcpy(reg_, iv, blockSz_); }
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protected:
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int blockSz_;
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byte* reg_;
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byte* tmp_;
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word32 r_[MaxBlockSz / sizeof(word32)]; // align reg_ on word32
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word32 t_[MaxBlockSz / sizeof(word32)]; // align tmp_ on word32
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CipherDir dir_;
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Mode mode_;
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void ECB_Process(byte*, const byte*, word32);
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void CBC_Encrypt(byte*, const byte*, word32);
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void CBC_Decrypt(byte*, const byte*, word32);
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Mode_BASE(const Mode_BASE&); // hide copy
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Mode_BASE& operator=(const Mode_BASE&); // and assign
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private:
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virtual void ProcessAndXorBlock(const byte*, const byte*, byte*) const = 0;
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};
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inline void Mode_BASE::Process(byte* out, const byte* in, word32 sz)
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{
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if (mode_ == ECB)
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ECB_Process(out, in, sz);
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else if (mode_ == CBC)
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if (dir_ == ENCRYPTION)
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CBC_Encrypt(out, in, sz);
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else
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CBC_Decrypt(out, in, sz);
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}
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// ECB Process blocks
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inline void Mode_BASE::ECB_Process(byte* out, const byte* in, word32 sz)
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{
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word32 blocks = sz / blockSz_;
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while (blocks--) {
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ProcessAndXorBlock(in, 0, out);
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out += blockSz_;
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in += blockSz_;
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}
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}
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// CBC Encrypt
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inline void Mode_BASE::CBC_Encrypt(byte* out, const byte* in, word32 sz)
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{
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word32 blocks = sz / blockSz_;
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while (blocks--) {
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xorbuf(reg_, in, blockSz_);
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ProcessAndXorBlock(reg_, 0, reg_);
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memcpy(out, reg_, blockSz_);
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out += blockSz_;
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in += blockSz_;
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}
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}
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// CBC Decrypt
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inline void Mode_BASE::CBC_Decrypt(byte* out, const byte* in, word32 sz)
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{
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word32 blocks = sz / blockSz_;
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byte hold[MaxBlockSz];
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while (blocks--) {
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memcpy(tmp_, in, blockSz_);
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ProcessAndXorBlock(tmp_, 0, out);
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xorbuf(out, reg_, blockSz_);
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memcpy(hold, reg_, blockSz_); // swap reg_ and tmp_
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memcpy(reg_, tmp_, blockSz_);
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memcpy(tmp_, hold, blockSz_);
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out += blockSz_;
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in += blockSz_;
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}
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}
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} // namespace
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#endif // TAO_CRYPT_MODES_HPP
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