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/*
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/* aes.hpp defines AES
*/
#ifndef TAO_CRYPT_AES_HPP
#define TAO_CRYPT_AES_HPP
#include "misc.hpp"
#include "modes.hpp"
#if defined(TAOCRYPT_X86ASM_AVAILABLE) && defined(TAO_ASM)
#define DO_AES_ASM
#endif
namespace TaoCrypt {
enum { AES_BLOCK_SIZE = 16 };
// AES encryption and decryption, see FIPS-197
class AES : public Mode_BASE {
public:
enum { BLOCK_SIZE = AES_BLOCK_SIZE };
AES(CipherDir DIR, Mode MODE)
: Mode_BASE(BLOCK_SIZE, DIR, MODE) {}
#ifdef DO_AES_ASM
void Process(byte*, const byte*, word32);
#endif
void SetKey(const byte* key, word32 sz, CipherDir fake = ENCRYPTION);
void SetIV(const byte* iv) { memcpy(r_, iv, BLOCK_SIZE); }
private:
static const word32 rcon_[];
word32 rounds_;
word32 key_[60]; // max size
static const word32 Te[5][256];
static const word32 Td[5][256];
static const byte CTd4[256];
static const word32* Te0;
static const word32* Te1;
static const word32* Te2;
static const word32* Te3;
static const word32* Te4;
static const word32* Td0;
static const word32* Td1;
static const word32* Td2;
static const word32* Td3;
static const word32* Td4;
void encrypt(const byte*, const byte*, byte*) const;
void AsmEncrypt(const byte*, byte*, void*) const;
void decrypt(const byte*, const byte*, byte*) const;
void AsmDecrypt(const byte*, byte*, void*) const;
void ProcessAndXorBlock(const byte*, const byte*, byte*) const;
word32 PreFetchTe() const;
word32 PreFetchTd() const;
word32 PreFetchCTd4() const;
AES(const AES&); // hide copy
AES& operator=(const AES&); // and assign
};
#if defined(__x86_64__) || defined(_M_X64) || \
(defined(__ILP32__) && (__ILP32__ >= 1))
#define TC_CACHE_LINE_SZ 64
#else
/* default cache line size */
#define TC_CACHE_LINE_SZ 32
#endif
inline word32 AES::PreFetchTe() const
{
word32 x = 0;
/* 4 tables of 256 entries */
for (int i = 0; i < 4; i++) {
/* each entry is 4 bytes */
for (int j = 0; j < 256; j += TC_CACHE_LINE_SZ/4) {
x &= Te[i][j];
}
}
return x;
}
inline word32 AES::PreFetchTd() const
{
word32 x = 0;
/* 4 tables of 256 entries */
for (int i = 0; i < 4; i++) {
/* each entry is 4 bytes */
for (int j = 0; j < 256; j += TC_CACHE_LINE_SZ/4) {
x &= Td[i][j];
}
}
return x;
}
inline word32 AES::PreFetchCTd4() const
{
word32 x = 0;
int i;
for (i = 0; i < 256; i += TC_CACHE_LINE_SZ) {
x &= CTd4[i];
}
return x;
}
typedef BlockCipher<ENCRYPTION, AES, ECB> AES_ECB_Encryption;
typedef BlockCipher<DECRYPTION, AES, ECB> AES_ECB_Decryption;
typedef BlockCipher<ENCRYPTION, AES, CBC> AES_CBC_Encryption;
typedef BlockCipher<DECRYPTION, AES, CBC> AES_CBC_Decryption;
} // naemspace
#endif // TAO_CRYPT_AES_HPP
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