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/*
* Noekeon
* (C) 1999-2008 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/noekeon.h>
#include <botan/loadstor.h>
#include <botan/cpuid.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::encrypt_n(const byte in[], byte out[], size_t blocks) const
{
#if defined(BOTAN_HAS_NOEKEON_SIMD)
if(CPUID::has_simd_32())
{
while(blocks >= 4)
{
simd_encrypt_4(in, out);
in += 4 * BLOCK_SIZE;
out += 4 * BLOCK_SIZE;
blocks -= 4;
}
}
#endif
for(size_t i = 0; i != blocks; ++i)
{
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(size_t j = 0; j != 16; ++j)
{
A0 ^= RC[j];
theta(A0, A1, A2, A3, m_EK.data());
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, m_EK.data());
store_be(out, A0, A1, A2, A3);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Noekeon Encryption
*/
void Noekeon::decrypt_n(const byte in[], byte out[], size_t blocks) const
{
#if defined(BOTAN_HAS_NOEKEON_SIMD)
if(CPUID::has_simd_32())
{
/*
const size_t blocks4 = blocks / 4;
const size_t blocks_left = blocks % 4;
in += blocks4 * BLOCK_SIZE;
out += blocks4 * BLOCK_SIZE;
blocks = blocks % 4;
BOTAN_PARALLEL_FOR(size_t i = 0; i < blocks4; ++i)
{
simd_encrypt_4(in + i*4*BLOCK_SIZE, out + i*4*BLOCK_SIZE);
}
*/
while(blocks >= 4)
{
simd_decrypt_4(in, out);
in += 4 * BLOCK_SIZE;
out += 4 * BLOCK_SIZE;
blocks -= 4;
}
}
#endif
for(size_t i = 0; i != blocks; ++i)
{
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(size_t j = 16; j != 0; --j)
{
theta(A0, A1, A2, A3, m_DK.data());
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, m_DK.data());
A0 ^= RC[0];
store_be(out, A0, A1, A2, A3);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Noekeon Key Schedule
*/
void Noekeon::key_schedule(const byte key[], size_t)
{
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(size_t i = 0; i != 16; ++i)
{
A0 ^= RC[i];
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];
m_DK.resize(4);
m_DK[0] = A0;
m_DK[1] = A1;
m_DK[2] = A2;
m_DK[3] = A3;
theta(A0, A1, A2, A3);
m_EK.resize(4);
m_EK[0] = A0;
m_EK[1] = A1;
m_EK[2] = A2;
m_EK[3] = A3;
}
/*
* Clear memory of sensitive data
*/
void Noekeon::clear()
{
zap(m_EK);
zap(m_DK);
}
}
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