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/*************************************************
* Noekeon Source File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#include <botan/noekeon.h>
#include <botan/loadstor.h>
#include <botan/bit_ops.h>
namespace Botan {
namespace {
/*************************************************
* Noekeon's Theta Operation *
*************************************************/
inline void theta(u32bit& A0, u32bit& A1,
u32bit& A2, u32bit& A3,
const u32bit EK[4])
{
u32bit T = A0 ^ A2;
T ^= rotate_left(T, 8) ^ rotate_right(T, 8);
A1 ^= T;
A3 ^= T;
A0 ^= EK[0];
A1 ^= EK[1];
A2 ^= EK[2];
A3 ^= EK[3];
T = A1 ^ A3;
T ^= rotate_left(T, 8) ^ rotate_right(T, 8);
A0 ^= T;
A2 ^= T;
}
/*************************************************
* Theta With Null Key *
*************************************************/
inline void theta(u32bit& A0, u32bit& A1,
u32bit& A2, u32bit& A3)
{
u32bit T = A0 ^ A2;
T ^= rotate_left(T, 8) ^ rotate_right(T, 8);
A1 ^= T;
A3 ^= T;
T = A1 ^ A3;
T ^= rotate_left(T, 8) ^ rotate_right(T, 8);
A0 ^= T;
A2 ^= T;
}
/*************************************************
* Noekeon's Gamma S-Box Layer *
*************************************************/
inline void gamma(u32bit& A0, u32bit& A1, u32bit& A2, u32bit& A3)
{
A1 ^= ~A3 & ~A2;
A0 ^= A2 & A1;
u32bit T = A3;
A3 = A0;
A0 = T;
A2 ^= A0 ^ A1 ^ A3;
A1 ^= ~A3 & ~A2;
A0 ^= A2 & A1;
}
}
/*************************************************
* Noekeon Round Constants *
*************************************************/
const byte Noekeon::RC[] = {
0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
0xD4 };
/*************************************************
* Noekeon Encryption *
*************************************************/
void Noekeon::enc(const byte in[], byte out[]) const
{
u32bit A0 = load_be<u32bit>(in, 0);
u32bit A1 = load_be<u32bit>(in, 1);
u32bit A2 = load_be<u32bit>(in, 2);
u32bit A3 = load_be<u32bit>(in, 3);
for(u32bit j = 0; j != 16; ++j)
{
A0 ^= RC[j];
theta(A0, A1, A2, A3, EK);
A1 = rotate_left(A1, 1);
A2 = rotate_left(A2, 5);
A3 = rotate_left(A3, 2);
gamma(A0, A1, A2, A3);
A1 = rotate_right(A1, 1);
A2 = rotate_right(A2, 5);
A3 = rotate_right(A3, 2);
}
A0 ^= RC[16];
theta(A0, A1, A2, A3, EK);
store_be(out, A0, A1, A2, A3);
}
/*************************************************
* Noekeon Encryption *
*************************************************/
void Noekeon::dec(const byte in[], byte out[]) const
{
u32bit A0 = load_be<u32bit>(in, 0);
u32bit A1 = load_be<u32bit>(in, 1);
u32bit A2 = load_be<u32bit>(in, 2);
u32bit A3 = load_be<u32bit>(in, 3);
for(u32bit j = 16; j != 0; --j)
{
theta(A0, A1, A2, A3, DK);
A0 ^= RC[j];
A1 = rotate_left(A1, 1);
A2 = rotate_left(A2, 5);
A3 = rotate_left(A3, 2);
gamma(A0, A1, A2, A3);
A1 = rotate_right(A1, 1);
A2 = rotate_right(A2, 5);
A3 = rotate_right(A3, 2);
}
theta(A0, A1, A2, A3, DK);
A0 ^= RC[0];
store_be(out, A0, A1, A2, A3);
}
/*************************************************
* Noekeon Key Schedule *
*************************************************/
void Noekeon::key(const byte key[], u32bit)
{
u32bit A0 = load_be<u32bit>(key, 0);
u32bit A1 = load_be<u32bit>(key, 1);
u32bit A2 = load_be<u32bit>(key, 2);
u32bit A3 = load_be<u32bit>(key, 3);
for(u32bit j = 0; j != 16; ++j)
{
A0 ^= RC[j];
theta(A0, A1, A2, A3);
A1 = rotate_left(A1, 1);
A2 = rotate_left(A2, 5);
A3 = rotate_left(A3, 2);
gamma(A0, A1, A2, A3);
A1 = rotate_right(A1, 1);
A2 = rotate_right(A2, 5);
A3 = rotate_right(A3, 2);
}
A0 ^= RC[16];
DK[0] = A0;
DK[1] = A1;
DK[2] = A2;
DK[3] = A3;
theta(A0, A1, A2, A3);
EK[0] = A0;
EK[1] = A1;
EK[2] = A2;
EK[3] = A3;
}
/*************************************************
* Clear memory of sensitive data *
*************************************************/
void Noekeon::clear() throw()
{
EK.clear();
DK.clear();
}
}
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