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/*
* Copyright (C) 2015 Martin Willi
* Copyright (C) 2015 revosec AG
*
* 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; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "aesni_key.h"
/**
* Rounds used for each AES key size
*/
#define AES128_ROUNDS 10
#define AES192_ROUNDS 12
#define AES256_ROUNDS 14
typedef struct private_aesni_key_t private_aesni_key_t;
/**
* Private data of an aesni_key_t object.
*/
struct private_aesni_key_t {
/**
* Public aesni_key_t interface.
*/
aesni_key_t public;
};
/**
* Invert round encryption keys to get a decryption key schedule
*/
static void reverse_key(aesni_key_t *this)
{
__m128i t[this->rounds + 1];
int i;
for (i = 0; i <= this->rounds; i++)
{
t[i] = this->schedule[i];
}
this->schedule[this->rounds] = t[0];
for (i = 1; i < this->rounds; i++)
{
this->schedule[this->rounds - i] = _mm_aesimc_si128(t[i]);
}
this->schedule[0] = t[this->rounds];
memwipe(t, sizeof(t));
}
/**
* Assist in creating a 128-bit round key
*/
static __m128i assist128(__m128i a, __m128i b)
{
__m128i c;
b = _mm_shuffle_epi32(b ,0xff);
c = _mm_slli_si128(a, 0x04);
a = _mm_xor_si128(a, c);
c = _mm_slli_si128(c, 0x04);
a = _mm_xor_si128(a, c);
c = _mm_slli_si128(c, 0x04);
a = _mm_xor_si128(a, c);
a = _mm_xor_si128(a, b);
return a;
}
/**
* Expand a 128-bit key to encryption round keys
*/
static void expand128(__m128i *key, __m128i *schedule)
{
__m128i t;
schedule[0] = t = _mm_loadu_si128(key);
schedule[1] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x01));
schedule[2] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x02));
schedule[3] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x04));
schedule[4] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x08));
schedule[5] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x10));
schedule[6] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x20));
schedule[7] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x40));
schedule[8] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x80));
schedule[9] = t = assist128(t, _mm_aeskeygenassist_si128(t, 0x1b));
schedule[10] = assist128(t, _mm_aeskeygenassist_si128(t, 0x36));
}
/**
* Assist in creating a 192-bit round key
*/
static __m128i assist192(__m128i b, __m128i c, __m128i *a)
{
__m128i t;
b = _mm_shuffle_epi32(b, 0x55);
t = _mm_slli_si128(*a, 0x04);
*a = _mm_xor_si128(*a, t);
t = _mm_slli_si128(t, 0x04);
*a = _mm_xor_si128(*a, t);
t = _mm_slli_si128(t, 0x04);
*a = _mm_xor_si128(*a, t);
*a = _mm_xor_si128(*a, b);
b = _mm_shuffle_epi32(*a, 0xff);
t = _mm_slli_si128(c, 0x04);
t = _mm_xor_si128(c, t);
t = _mm_xor_si128(t, b);
return t;
}
/**
* return a[63:0] | b[63:0] << 64
*/
static __m128i _mm_shuffle_i00(__m128i a, __m128i b)
{
return (__m128i)_mm_shuffle_pd((__m128d)a, (__m128d)b, 0);
}
/**
* return a[127:64] >> 64 | b[63:0] << 64
*/
static __m128i _mm_shuffle_i01(__m128i a, __m128i b)
{
return (__m128i)_mm_shuffle_pd((__m128d)a, (__m128d)b, 1);
}
/**
* Expand a 192-bit encryption key to round keys
*/
static void expand192(__m128i *key, __m128i *schedule)
{
__m128i t1, t2, t3;
schedule[0] = t1 = _mm_loadu_si128(key);
t2 = t3 = _mm_loadu_si128(key + 1);
t2 = assist192(_mm_aeskeygenassist_si128(t2, 0x1), t2, &t1);
schedule[1] = _mm_shuffle_i00(t3, t1);
schedule[2] = _mm_shuffle_i01(t1, t2);
t2 = t3 = assist192(_mm_aeskeygenassist_si128(t2, 0x2), t2, &t1);
schedule[3] = t1;
t2 = assist192(_mm_aeskeygenassist_si128(t2, 0x4), t2, &t1);
schedule[4] = _mm_shuffle_i00(t3, t1);
schedule[5] = _mm_shuffle_i01(t1, t2);
t2 = t3 = assist192(_mm_aeskeygenassist_si128(t2, 0x8), t2, &t1);
schedule[6] = t1;
t2 = assist192(_mm_aeskeygenassist_si128 (t2,0x10), t2, &t1);
schedule[7] = _mm_shuffle_i00(t3, t1);
schedule[8] = _mm_shuffle_i01(t1, t2);
t2 = t3 = assist192(_mm_aeskeygenassist_si128 (t2,0x20), t2, &t1);
schedule[9] = t1;
t2 = assist192(_mm_aeskeygenassist_si128(t2, 0x40), t2, &t1);
schedule[10] = _mm_shuffle_i00(t3, t1);
schedule[11] = _mm_shuffle_i01(t1, t2);
assist192(_mm_aeskeygenassist_si128(t2, 0x80), t2, &t1);
schedule[12] = t1;
}
/**
* Assist in creating a 256-bit round key
*/
static __m128i assist256_1(__m128i a, __m128i b)
{
__m128i x, y;
b = _mm_shuffle_epi32(b, 0xff);
y = _mm_slli_si128(a, 0x04);
x = _mm_xor_si128(a, y);
y = _mm_slli_si128(y, 0x04);
x = _mm_xor_si128 (x, y);
y = _mm_slli_si128(y, 0x04);
x = _mm_xor_si128(x, y);
x = _mm_xor_si128(x, b);
return x;
}
/**
* Assist in creating a 256-bit round key
*/
static __m128i assist256_2(__m128i a, __m128i b)
{
__m128i x, y, z;
y = _mm_aeskeygenassist_si128(a, 0x00);
z = _mm_shuffle_epi32(y, 0xaa);
y = _mm_slli_si128(b, 0x04);
x = _mm_xor_si128(b, y);
y = _mm_slli_si128(y, 0x04);
x = _mm_xor_si128(x, y);
y = _mm_slli_si128(y, 0x04);
x = _mm_xor_si128(x, y);
x = _mm_xor_si128(x, z);
return x;
}
/**
* Expand a 256-bit encryption key to round keys
*/
static void expand256(__m128i *key, __m128i *schedule)
{
__m128i t1, t2;
schedule[0] = t1 = _mm_loadu_si128(key);
schedule[1] = t2 = _mm_loadu_si128(key + 1);
schedule[2] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x01));
schedule[3] = t2 = assist256_2(t1, t2);
schedule[4] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x02));
schedule[5] = t2 = assist256_2(t1, t2);
schedule[6] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x04));
schedule[7] = t2 = assist256_2(t1, t2);
schedule[8] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x08));
schedule[9] = t2 = assist256_2(t1, t2);
schedule[10] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x10));
schedule[11] = t2 = assist256_2(t1, t2);
schedule[12] = t1 = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x20));
schedule[13] = t2 = assist256_2(t1, t2);
schedule[14] = assist256_1(t1, _mm_aeskeygenassist_si128(t2, 0x40));
}
METHOD(aesni_key_t, destroy, void,
private_aesni_key_t *this)
{
memwipe(this, sizeof(*this) + (this->public.rounds + 1) * AES_BLOCK_SIZE);
free_align(this);
}
/**
* See header
*/
aesni_key_t *aesni_key_create(bool encrypt, chunk_t key)
{
private_aesni_key_t *this;
int rounds;
switch (key.len)
{
case 16:
rounds = AES128_ROUNDS;
break;
case 24:
rounds = AES192_ROUNDS;
break;
case 32:
rounds = AES256_ROUNDS;
break;
default:
return NULL;
}
INIT_EXTRA_ALIGN(this, (rounds + 1) * AES_BLOCK_SIZE, sizeof(__m128i),
.public = {
.destroy = _destroy,
.rounds = rounds,
},
);
switch (key.len)
{
case 16:
expand128((__m128i*)key.ptr, this->public.schedule);
break;
case 24:
expand192((__m128i*)key.ptr, this->public.schedule);
break;
case 32:
expand256((__m128i*)key.ptr, this->public.schedule);
break;
default:
break;
}
if (!encrypt)
{
reverse_key(&this->public);
}
return &this->public;
}
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