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/*************************************************
* MISTY1 Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/misty1.h>
#include <botan/loadstor.h>
#include <botan/parsing.h>
namespace Botan {
namespace {
/*************************************************
* MISTY1 FI Function *
*************************************************/
u16bit FI(u16bit input, u16bit key7, u16bit key9)
{
u16bit D9 = input >> 7, D7 = input & 0x7F;
D9 = MISTY1_SBOX_S9[D9] ^ D7;
D7 = (MISTY1_SBOX_S7[D7] ^ key7 ^ D9) & 0x7F;
D9 = MISTY1_SBOX_S9[D9 ^ key9] ^ D7;
return static_cast<u16bit>((D7 << 9) | D9);
}
}
/*************************************************
* MISTY1 Encryption *
*************************************************/
void MISTY1::enc(const byte in[], byte out[]) const
{
u16bit B0 = load_be<u16bit>(in, 0);
u16bit B1 = load_be<u16bit>(in, 1);
u16bit B2 = load_be<u16bit>(in, 2);
u16bit B3 = load_be<u16bit>(in, 3);
for(u32bit j = 0; j != 12; j += 3)
{
const u16bit* RK = EK + 8 * j;
B1 ^= B0 & RK[0];
B0 ^= B1 | RK[1];
B3 ^= B2 & RK[2];
B2 ^= B3 | RK[3];
u32bit T0, T1;
T0 = FI(B0 ^ RK[ 4], RK[ 5], RK[ 6]) ^ B1;
T1 = FI(B1 ^ RK[ 7], RK[ 8], RK[ 9]) ^ T0;
T0 = FI(T0 ^ RK[10], RK[11], RK[12]) ^ T1;
B2 ^= T1 ^ RK[13];
B3 ^= T0;
T0 = FI(B2 ^ RK[14], RK[15], RK[16]) ^ B3;
T1 = FI(B3 ^ RK[17], RK[18], RK[19]) ^ T0;
T0 = FI(T0 ^ RK[20], RK[21], RK[22]) ^ T1;
B0 ^= T1 ^ RK[23];
B1 ^= T0;
}
B1 ^= B0 & EK[96];
B0 ^= B1 | EK[97];
B3 ^= B2 & EK[98];
B2 ^= B3 | EK[99];
store_be(out, B2, B3, B0, B1);
}
/*************************************************
* MISTY1 Decryption *
*************************************************/
void MISTY1::dec(const byte in[], byte out[]) const
{
u16bit B0 = load_be<u16bit>(in, 2);
u16bit B1 = load_be<u16bit>(in, 3);
u16bit B2 = load_be<u16bit>(in, 0);
u16bit B3 = load_be<u16bit>(in, 1);
for(u32bit j = 0; j != 12; j += 3)
{
const u16bit* RK = DK + 8 * j;
B2 ^= B3 | RK[0];
B3 ^= B2 & RK[1];
B0 ^= B1 | RK[2];
B1 ^= B0 & RK[3];
u32bit T0, T1;
T0 = FI(B2 ^ RK[ 4], RK[ 5], RK[ 6]) ^ B3;
T1 = FI(B3 ^ RK[ 7], RK[ 8], RK[ 9]) ^ T0;
T0 = FI(T0 ^ RK[10], RK[11], RK[12]) ^ T1;
B0 ^= T1 ^ RK[13];
B1 ^= T0;
T0 = FI(B0 ^ RK[14], RK[15], RK[16]) ^ B1;
T1 = FI(B1 ^ RK[17], RK[18], RK[19]) ^ T0;
T0 = FI(T0 ^ RK[20], RK[21], RK[22]) ^ T1;
B2 ^= T1 ^ RK[23];
B3 ^= T0;
}
B2 ^= B3 | DK[96];
B3 ^= B2 & DK[97];
B0 ^= B1 | DK[98];
B1 ^= B0 & DK[99];
store_be(out, B0, B1, B2, B3);
}
/*************************************************
* MISTY1 Key Schedule *
*************************************************/
void MISTY1::key_schedule(const byte key[], u32bit length)
{
SecureBuffer<u16bit, 32> KS;
for(u32bit j = 0; j != length / 2; ++j)
KS[j] = load_be<u16bit>(key, j);
for(u32bit j = 0; j != 8; ++j)
{
KS[j+ 8] = FI(KS[j], KS[(j+1) % 8] >> 9, KS[(j+1) % 8] & 0x1FF);
KS[j+16] = KS[j+8] >> 9;
KS[j+24] = KS[j+8] & 0x1FF;
}
for(u32bit j = 0; j != 100; ++j)
{
EK[j] = KS[EK_ORDER[j]];
DK[j] = KS[DK_ORDER[j]];
}
}
/*************************************************
* MISTY1 Constructor *
*************************************************/
MISTY1::MISTY1(u32bit rounds) : BlockCipher(8, 16)
{
if(rounds != 8)
throw Invalid_Argument("MISTY1: Invalid number of rounds: "
+ to_string(rounds));
}
}
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