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/*
Copyright (c) 2006, 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.
*/
/* C++ based on Wei Dai's twofish.cpp from CryptoPP */
/* x86 asm original */
#if defined(TAOCRYPT_KERNEL_MODE)
#define DO_TAOCRYPT_KERNEL_MODE
#endif // only some modules now support this
#include "runtime.hpp"
#include "twofish.hpp"
namespace TaoCrypt {
#if defined(DO_TWOFISH_ASM)
// ia32 optimized version
void Twofish::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--) {
if (dir_ == ENCRYPTION)
AsmEncrypt(in, out);
else
AsmDecrypt(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);
r_[2] ^= *(word32*)(in + 8);
r_[3] ^= *(word32*)(in + 12);
AsmEncrypt((byte*)r_, (byte*)r_);
memcpy(out, r_, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
else
while (blocks--) {
AsmDecrypt(in, out);
*(word32*)out ^= r_[0];
*(word32*)(out + 4) ^= r_[1];
*(word32*)(out + 8) ^= r_[2];
*(word32*)(out + 12) ^= r_[3];
memcpy(r_, in, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
}
}
#endif // DO_TWOFISH_ASM
namespace { // locals
// compute (c * x^4) mod (x^4 + (a + 1/a) * x^3 + a * x^2 + (a + 1/a) * x + 1)
// over GF(256)
static inline unsigned int Mod(unsigned int c)
{
static const unsigned int modulus = 0x14d;
unsigned int c2 = (c<<1) ^ ((c & 0x80) ? modulus : 0);
unsigned int c1 = c2 ^ (c>>1) ^ ((c & 1) ? (modulus>>1) : 0);
return c | (c1 << 8) | (c2 << 16) | (c1 << 24);
}
// compute RS(12,8) code with the above polynomial as generator
// this is equivalent to multiplying by the RS matrix
static word32 ReedSolomon(word32 high, word32 low)
{
for (unsigned int i=0; i<8; i++) {
high = Mod(high>>24) ^ (high<<8) ^ (low>>24);
low <<= 8;
}
return high;
}
} // local namespace
inline word32 Twofish::h0(word32 x, const word32* key, unsigned int kLen)
{
x = x | (x<<8) | (x<<16) | (x<<24);
switch(kLen)
{
#define Q(a, b, c, d, t) q_[a][GETBYTE(t,0)] ^ (q_[b][GETBYTE(t,1)] << 8) ^ \
(q_[c][GETBYTE(t,2)] << 16) ^ (q_[d][GETBYTE(t,3)] << 24)
case 4: x = Q(1, 0, 0, 1, x) ^ key[6];
case 3: x = Q(1, 1, 0, 0, x) ^ key[4];
case 2: x = Q(0, 1, 0, 1, x) ^ key[2];
x = Q(0, 0, 1, 1, x) ^ key[0];
}
return x;
}
inline word32 Twofish::h(word32 x, const word32* key, unsigned int kLen)
{
x = h0(x, key, kLen);
return mds_[0][GETBYTE(x,0)] ^ mds_[1][GETBYTE(x,1)] ^
mds_[2][GETBYTE(x,2)] ^ mds_[3][GETBYTE(x,3)];
}
void Twofish::SetKey(const byte* userKey, word32 keylen, CipherDir /*dummy*/)
{
unsigned int len = (keylen <= 16 ? 2 : (keylen <= 24 ? 3 : 4));
word32 key[8];
GetUserKey(LittleEndianOrder, key, len*2, userKey, keylen);
unsigned int i;
for (i=0; i<40; i+=2) {
word32 a = h(i, key, len);
word32 b = rotlFixed(h(i+1, key+1, len), 8);
k_[i] = a+b;
k_[i+1] = rotlFixed(a+2*b, 9);
}
word32 svec[8];
for (i=0; i<len; i++)
svec[2*(len-i-1)] = ReedSolomon(key[2*i+1], key[2*i]);
for (i=0; i<256; i++) {
word32 t = h0(i, svec, len);
s_[0][i] = mds_[0][GETBYTE(t, 0)];
s_[1][i] = mds_[1][GETBYTE(t, 1)];
s_[2][i] = mds_[2][GETBYTE(t, 2)];
s_[3][i] = mds_[3][GETBYTE(t, 3)];
}
}
void Twofish::ProcessAndXorBlock(const byte* in, const byte* xOr, byte* out)
const
{
if (dir_ == ENCRYPTION)
encrypt(in, xOr, out);
else
decrypt(in, xOr, out);
}
#define G1(x) (s_[0][GETBYTE(x,0)] ^ s_[1][GETBYTE(x,1)] ^ \
s_[2][GETBYTE(x,2)] ^ s_[3][GETBYTE(x,3)])
#define G2(x) (s_[0][GETBYTE(x,3)] ^ s_[1][GETBYTE(x,0)] ^ \
s_[2][GETBYTE(x,1)] ^ s_[3][GETBYTE(x,2)])
#define ENCROUND(n, a, b, c, d) \
x = G1 (a); y = G2 (b); \
x += y; y += x + k[2 * (n) + 1]; \
(c) ^= x + k[2 * (n)]; \
(c) = rotrFixed(c, 1); \
(d) = rotlFixed(d, 1) ^ y
#define ENCCYCLE(n) \
ENCROUND (2 * (n), a, b, c, d); \
ENCROUND (2 * (n) + 1, c, d, a, b)
#define DECROUND(n, a, b, c, d) \
x = G1 (a); y = G2 (b); \
x += y; y += x; \
(d) ^= y + k[2 * (n) + 1]; \
(d) = rotrFixed(d, 1); \
(c) = rotlFixed(c, 1); \
(c) ^= (x + k[2 * (n)])
#define DECCYCLE(n) \
DECROUND (2 * (n) + 1, c, d, a, b); \
DECROUND (2 * (n), a, b, c, d)
typedef BlockGetAndPut<word32, LittleEndian> gpBlock;
void Twofish::encrypt(const byte* inBlock, const byte* xorBlock,
byte* outBlock) const
{
word32 x, y, a, b, c, d;
gpBlock::Get(inBlock)(a)(b)(c)(d);
a ^= k_[0];
b ^= k_[1];
c ^= k_[2];
d ^= k_[3];
const word32 *k = k_+8;
ENCCYCLE (0);
ENCCYCLE (1);
ENCCYCLE (2);
ENCCYCLE (3);
ENCCYCLE (4);
ENCCYCLE (5);
ENCCYCLE (6);
ENCCYCLE (7);
c ^= k_[4];
d ^= k_[5];
a ^= k_[6];
b ^= k_[7];
gpBlock::Put(xorBlock, outBlock)(c)(d)(a)(b);
}
void Twofish::decrypt(const byte* inBlock, const byte* xorBlock,
byte* outBlock) const
{
word32 x, y, a, b, c, d;
gpBlock::Get(inBlock)(c)(d)(a)(b);
c ^= k_[4];
d ^= k_[5];
a ^= k_[6];
b ^= k_[7];
const word32 *k = k_+8;
DECCYCLE (7);
DECCYCLE (6);
DECCYCLE (5);
DECCYCLE (4);
DECCYCLE (3);
DECCYCLE (2);
DECCYCLE (1);
DECCYCLE (0);
a ^= k_[0];
b ^= k_[1];
c ^= k_[2];
d ^= k_[3];
gpBlock::Put(xorBlock, outBlock)(a)(b)(c)(d);
}
#if defined(DO_TWOFISH_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( movd mm6, ebp ) \
AS2( mov edi, DWORD PTR [ebp + 8] ) \
AS2( mov esi, DWORD PTR [ebp + 12] )
#define EPILOG() \
AS2( movd esp, mm6 ) \
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( movd mm6, ebp ) \
AS2( mov edi, ecx ) \
AS2( mov esi, DWORD PTR [ebp + 8] )
/* ebp already set */
#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
// x = esi, y = [esp], s_ = ebp
// edi always open for G1 and G2
// G1 also uses edx after save and restore
// G2 also uses eax after save and restore
// and ecx for tmp [esp] which Rounds also use
// and restore from mm7
// x = G1(a) bytes(0,1,2,3)
#define ASMG1(z, zl, zh) \
AS2( movd mm2, edx ) \
AS2( movzx edi, zl ) \
AS2( mov esi, DWORD PTR [ebp + edi*4] ) \
AS2( movzx edx, zh ) \
AS2( xor esi, DWORD PTR 1024[ebp + edx*4] ) \
\
AS2( mov edx, z ) \
AS2( shr edx, 16 ) \
AS2( movzx edi, dl ) \
AS2( xor esi, DWORD PTR 2048[ebp + edi*4] ) \
AS2( movzx edx, dh ) \
AS2( xor esi, DWORD PTR 3072[ebp + edx*4] ) \
AS2( movd edx, mm2 )
// y = G2(b) bytes(3,0,1,2) [ put y into ecx for Rounds ]
#define ASMG2(z, zl, zh) \
AS2( movd mm7, ecx ) \
AS2( movd mm2, eax ) \
AS2( mov edi, z ) \
AS2( shr edi, 24 ) \
AS2( mov ecx, DWORD PTR [ebp + edi*4] ) \
AS2( movzx eax, zl ) \
AS2( xor ecx, DWORD PTR 1024[ebp + eax*4] ) \
\
AS2( mov eax, z ) \
AS2( shr eax, 16 ) \
AS2( movzx edi, zh ) \
AS2( xor ecx, DWORD PTR 2048[ebp + edi*4] ) \
AS2( movzx eax, al ) \
AS2( xor ecx, DWORD PTR 3072[ebp + eax*4] ) \
AS2( movd eax, mm2 )
// encrypt Round (n),
// x = esi, k = ebp, edi open
// y is in ecx from G2, restore when done from mm7
// before C (which be same register!)
#define ASMENCROUND(N, A, A2, A3, B, B2, B3, C, D) \
/* setup s_ */ \
AS2( movd ebp, mm1 ) \
ASMG1(A, A2, A3) \
ASMG2(B, B2, B3) \
/* setup k */ \
AS2( movd ebp, mm0 ) \
/* x += y */ \
AS2( add esi, ecx ) \
AS2( add ebp, 32 ) \
/* y += x + k[2 * (n) + 1] */ \
AS2( add ecx, esi ) \
AS2( rol D, 1 ) \
AS2( add ecx, DWORD PTR [ebp + 8 * N + 4] ) \
/* (d) = rotlFixed(d, 1) ^ y */ \
AS2( xor D, ecx ) \
AS2( movd ecx, mm7 ) \
/* (c) ^= x + k[2 * (n)] */ \
AS2( mov edi, esi ) \
AS2( add edi, DWORD PTR [ebp + 8 * N] ) \
AS2( xor C, edi ) \
/* (c) = rotrFixed(c, 1) */ \
AS2( ror C, 1 )
// decrypt Round (n),
// x = esi, k = ebp, edi open
// y is in ecx from G2, restore ecx from mm7 when done
#define ASMDECROUND(N, A, A2, A3, B, B2, B3, C, D) \
/* setup s_ */ \
AS2( movd ebp, mm1 ) \
ASMG1(A, A2, A3) \
ASMG2(B, B2, B3) \
/* setup k */ \
AS2( movd ebp, mm0 ) \
/* x += y */ \
AS2( add esi, ecx ) \
AS2( add ebp, 32 ) \
/* y += x */ \
AS2( add ecx, esi ) \
/* (d) ^= y + k[2 * (n) + 1] */ \
AS2( mov edi, DWORD PTR [ebp + 8 * N + 4] ) \
AS2( add edi, ecx ) \
AS2( movd ecx, mm7 ) \
AS2( xor D, edi ) \
/* (d) = rotrFixed(d, 1) */ \
AS2( ror D, 1 ) \
/* (c) = rotlFixed(c, 1) */ \
AS2( rol C, 1 ) \
/* (c) ^= (x + k[2 * (n)]) */ \
AS2( mov edi, esi ) \
AS2( add edi, DWORD PTR [ebp + 8 * N] ) \
AS2( xor C, edi )
#ifdef _MSC_VER
__declspec(naked)
#endif
void Twofish::AsmEncrypt(const byte* inBlock, byte* outBlock) const
{
PROLOG()
#ifdef OLD_GCC_OFFSET
AS2( add edi, 60 ) // k_
#else
AS2( add edi, 56 ) // k_
#endif
AS2( mov ebp, edi )
AS2( mov eax, DWORD PTR [esi] ) // a
AS2( movd mm0, edi ) // store k_
AS2( mov ebx, DWORD PTR [esi + 4] ) // b
AS2( add ebp, 160 ) // s_[0]
AS2( mov ecx, DWORD PTR [esi + 8] ) // c
AS2( movd mm1, ebp ) // store s_
AS2( mov edx, DWORD PTR [esi + 12] ) // d
AS2( xor eax, DWORD PTR [edi] ) // k_[0]
AS2( xor ebx, DWORD PTR [edi + 4] ) // [1]
AS2( xor ecx, DWORD PTR [edi + 8] ) // [2]
AS2( xor edx, DWORD PTR [edi + 12] ) // [3]
ASMENCROUND( 0, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 1, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 2, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 3, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 4, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 5, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 6, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 7, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 8, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 9, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(10, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(11, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(12, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(13, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(14, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(15, ecx, cl, ch, edx, dl, dh, eax, ebx)
AS2( movd ebp, mm6 )
AS2( movd esi, mm0 ) // k_
#ifdef __GNUC__
AS2( mov edi, [ebp + 16] ) // outBlock
#else
AS2( mov edi, [ebp + 12] ) // outBlock
#endif
AS2( xor ecx, DWORD PTR [esi + 16] ) // k_[4]
AS2( xor edx, DWORD PTR [esi + 20] ) // k_[5]
AS2( xor eax, DWORD PTR [esi + 24] ) // k_[6]
AS2( xor ebx, DWORD PTR [esi + 28] ) // k_[7]
AS2( mov [edi], ecx ) // write out
AS2( mov [edi + 4], edx ) // write out
AS2( mov [edi + 8], eax ) // write out
AS2( mov [edi + 12], ebx ) // write out
EPILOG()
}
#ifdef _MSC_VER
__declspec(naked)
#endif
void Twofish::AsmDecrypt(const byte* inBlock, byte* outBlock) const
{
PROLOG()
#ifdef OLD_GCC_OFFSET
AS2( add edi, 60 ) // k_
#else
AS2( add edi, 56 ) // k_
#endif
AS2( mov ebp, edi )
AS2( mov ecx, DWORD PTR [esi] ) // c
AS2( movd mm0, edi ) // store k_
AS2( mov edx, DWORD PTR [esi + 4] ) // d
AS2( add ebp, 160 ) // s_[0]
AS2( mov eax, DWORD PTR [esi + 8] ) // a
AS2( movd mm1, ebp ) // store s_
AS2( mov ebx, DWORD PTR [esi + 12] ) // b
AS2( xor ecx, DWORD PTR [edi + 16] ) // k_[4]
AS2( xor edx, DWORD PTR [edi + 20] ) // [5]
AS2( xor eax, DWORD PTR [edi + 24] ) // [6]
AS2( xor ebx, DWORD PTR [edi + 28] ) // [7]
ASMDECROUND(15, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(14, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND(13, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(12, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND(11, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(10, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 9, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 8, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 7, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 6, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 5, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 4, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 3, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 2, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 1, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 0, eax, al, ah, ebx, bl, bh, ecx, edx)
AS2( movd ebp, mm6 )
AS2( movd esi, mm0 ) // k_
#ifdef __GNUC__
AS2( mov edi, [ebp + 16] ) // outBlock
#else
AS2( mov edi, [ebp + 12] ) // outBlock
#endif
AS2( xor eax, DWORD PTR [esi ] ) // k_[0]
AS2( xor ebx, DWORD PTR [esi + 4] ) // k_[1]
AS2( xor ecx, DWORD PTR [esi + 8] ) // k_[2]
AS2( xor edx, DWORD PTR [esi + 12] ) // k_[3]
AS2( mov [edi], eax ) // write out
AS2( mov [edi + 4], ebx ) // write out
AS2( mov [edi + 8], ecx ) // write out
AS2( mov [edi + 12], edx ) // write out
EPILOG()
}
#endif // defined(DO_TWOFISH_ASM)
} // namespace
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