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/*
Copyright (c) 2006, 2010, 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* C++ code based on Wei Dai's blowfish.cpp from CryptoPP */
/* x86 asm is original */
#if defined(TAOCRYPT_KERNEL_MODE)
#define DO_TAOCRYPT_KERNEL_MODE
#endif // only some modules now support this
#include "runtime.hpp"
#include "blowfish.hpp"
namespace TaoCrypt {
#if defined(DO_BLOWFISH_ASM)
// ia32 optimized version
void Blowfish::Process(byte* out, const byte* in, word32 sz)
{
if (!isMMX) {
Mode_BASE::Process(out, in, sz);
return;
}
word32 blocks = sz / BLOCK_SIZE;
if (mode_ == ECB)
while (blocks--) {
AsmProcess(in, out);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
else if (mode_ == CBC) {
if (dir_ == ENCRYPTION)
while (blocks--) {
r_[0] ^= *(word32*)in;
r_[1] ^= *(word32*)(in + 4);
AsmProcess((byte*)r_, (byte*)r_);
memcpy(out, r_, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
else
while (blocks--) {
AsmProcess(in, out);
*(word32*)out ^= r_[0];
*(word32*)(out + 4) ^= r_[1];
memcpy(r_, in, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
}
}
#endif // DO_BLOWFISH_ASM
void Blowfish::SetKey(const byte* key_string, word32 keylength, CipherDir dir)
{
assert(keylength >= 4 && keylength <= 56);
unsigned i, j=0, k;
word32 data, dspace[2] = {0, 0};
memcpy(pbox_, p_init_, sizeof(p_init_));
memcpy(sbox_, s_init_, sizeof(s_init_));
// Xor key string into encryption key vector
for (i=0 ; i<ROUNDS+2 ; ++i) {
data = 0;
for (k=0 ; k<4 ; ++k )
data = (data << 8) | key_string[j++ % keylength];
pbox_[i] ^= data;
}
crypt_block(dspace, pbox_);
for (i=0; i<ROUNDS; i+=2)
crypt_block(pbox_ + i, pbox_ + i + 2);
crypt_block(pbox_ + ROUNDS, sbox_);
for (i=0; i < 4*256-2; i+=2)
crypt_block(sbox_ + i, sbox_ + i + 2);
if (dir==DECRYPTION)
for (i=0; i<(ROUNDS+2)/2; i++)
STL::swap(pbox_[i], pbox_[ROUNDS+1-i]);
}
#define BFBYTE_0(x) ( x &0xFF)
#define BFBYTE_1(x) ((x>> 8)&0xFF)
#define BFBYTE_2(x) ((x>>16)&0xFF)
#define BFBYTE_3(x) ( x>>24)
#define BF_S(Put, Get, I) (\
Put ^= p[I], \
tmp = p[18 + BFBYTE_3(Get)], \
tmp += p[274+ BFBYTE_2(Get)], \
tmp ^= p[530+ BFBYTE_1(Get)], \
tmp += p[786+ BFBYTE_0(Get)], \
Put ^= tmp \
)
#define BF_ROUNDS \
BF_S(right, left, 1); \
BF_S(left, right, 2); \
BF_S(right, left, 3); \
BF_S(left, right, 4); \
BF_S(right, left, 5); \
BF_S(left, right, 6); \
BF_S(right, left, 7); \
BF_S(left, right, 8); \
BF_S(right, left, 9); \
BF_S(left, right, 10); \
BF_S(right, left, 11); \
BF_S(left, right, 12); \
BF_S(right, left, 13); \
BF_S(left, right, 14); \
BF_S(right, left, 15); \
BF_S(left, right, 16);
#define BF_EXTRA_ROUNDS \
BF_S(right, left, 17); \
BF_S(left, right, 18); \
BF_S(right, left, 19); \
BF_S(left, right, 20);
// Used by key setup, no byte swapping
void Blowfish::crypt_block(const word32 in[2], word32 out[2]) const
{
word32 left = in[0];
word32 right = in[1];
const word32* p = pbox_;
word32 tmp;
left ^= p[0];
BF_ROUNDS
#if ROUNDS == 20
BF_EXTRA_ROUNDS
#endif
right ^= p[ROUNDS + 1];
out[0] = right;
out[1] = left;
}
typedef BlockGetAndPut<word32, BigEndian> gpBlock;
void Blowfish::ProcessAndXorBlock(const byte* in, const byte* xOr, byte* out)
const
{
word32 tmp, left, right;
const word32* p = pbox_;
gpBlock::Get(in)(left)(right);
left ^= p[0];
BF_ROUNDS
#if ROUNDS == 20
BF_EXTRA_ROUNDS
#endif
right ^= p[ROUNDS + 1];
gpBlock::Put(xOr, out)(right)(left);
}
#if defined(DO_BLOWFISH_ASM)
#ifdef __GNUC__
#define AS1(x) asm(#x);
#define AS2(x, y) asm(#x ", " #y);
#define PROLOG() \
asm(".intel_syntax noprefix"); \
AS2( movd mm3, edi ) \
AS2( movd mm4, ebx ) \
AS2( movd mm5, esi ) \
AS2( mov ecx, DWORD PTR [ebp + 8] ) \
AS2( mov esi, DWORD PTR [ebp + 12] )
#define EPILOG() \
AS2( movd esi, mm5 ) \
AS2( movd ebx, mm4 ) \
AS2( movd edi, mm3 ) \
AS1( emms ) \
asm(".att_syntax");
#else
#define AS1(x) __asm x
#define AS2(x, y) __asm x, y
#define PROLOG() \
AS1( push ebp ) \
AS2( mov ebp, esp ) \
AS2( movd mm3, edi ) \
AS2( movd mm4, ebx ) \
AS2( movd mm5, esi ) \
AS2( mov esi, DWORD PTR [ebp + 8] )
#define EPILOG() \
AS2( movd esi, mm5 ) \
AS2( movd ebx, mm4 ) \
AS2( movd edi, mm3 ) \
AS2( mov esp, ebp ) \
AS1( pop ebp ) \
AS1( emms ) \
AS1( ret 8 )
#endif
#define BF_ROUND(P, G, I) \
/* Put ^= p[I] */ \
AS2( xor P, [edi + I*4] ) \
/* tmp = p[18 + BFBYTE_3(Get)] */ \
AS2( mov ecx, G ) \
AS2( shr ecx, 16 ) \
AS2( movzx edx, ch ) \
AS2( mov esi, [edi + edx*4 + 72] ) \
/* tmp += p[274+ BFBYTE_2(Get)] */ \
AS2( movzx ecx, cl ) \
AS2( add esi, [edi + ecx*4 + 1096] ) \
/* tmp ^= p[530+ BFBYTE_1(Get)] */ \
AS2( mov ecx, G ) \
AS2( movzx edx, ch ) \
AS2( xor esi, [edi + edx*4 + 2120] ) \
/* tmp += p[786+ BFBYTE_0(Get)] */ \
AS2( movzx ecx, cl ) \
AS2( add esi, [edi + ecx*4 + 3144] ) \
/* Put ^= tmp */ \
AS2( xor P, esi )
#ifdef _MSC_VER
__declspec(naked)
#endif
void Blowfish::AsmProcess(const byte* inBlock, byte* outBlock) const
{
PROLOG()
#ifdef OLD_GCC_OFFSET
AS2( lea edi, [ecx + 60] ) // pbox
#else
AS2( lea edi, [ecx + 56] ) // pbox
#endif
AS2( mov eax, DWORD PTR [esi] )
AS2( mov edx, DWORD PTR [edi] )
AS1( bswap eax )
AS2( mov ebx, DWORD PTR [esi + 4] )
AS2( xor eax, edx ) // left
AS1( bswap ebx ) // right
BF_ROUND(ebx, eax, 1)
BF_ROUND(eax, ebx, 2)
BF_ROUND(ebx, eax, 3)
BF_ROUND(eax, ebx, 4)
BF_ROUND(ebx, eax, 5)
BF_ROUND(eax, ebx, 6)
BF_ROUND(ebx, eax, 7)
BF_ROUND(eax, ebx, 8)
BF_ROUND(ebx, eax, 9)
BF_ROUND(eax, ebx, 10)
BF_ROUND(ebx, eax, 11)
BF_ROUND(eax, ebx, 12)
BF_ROUND(ebx, eax, 13)
BF_ROUND(eax, ebx, 14)
BF_ROUND(ebx, eax, 15)
BF_ROUND(eax, ebx, 16)
#if ROUNDS == 20
BF_ROUND(ebx, eax, 17)
BF_ROUND(eax, ebx, 18)
BF_ROUND(ebx, eax, 19)
BF_ROUND(eax, ebx, 20)
AS2( xor ebx, [edi + 84] ) // 20 + 1 (x4)
#else
AS2( xor ebx, [edi + 68] ) // 16 + 1 (x4)
#endif
#ifdef __GNUC__
AS2( mov edi, [ebp + 16] ) // outBlock
#else
AS2( mov edi, [ebp + 12] ) // outBlock
#endif
AS1( bswap ebx )
AS1( bswap eax )
AS2( mov [edi] , ebx )
AS2( mov [edi + 4], eax )
EPILOG()
}
#endif // DO_BLOWFISH_ASM
} // namespace
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