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/**
* AES-128 using Intel's AES-NI instructions
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/aes_intel.h>
#include <wmmintrin.h>
namespace Botan {
namespace {
__m128i aes_128_key_expansion(__m128i key, __m128i key_with_rcon)
{
key_with_rcon = _mm_shuffle_epi32(key_with_rcon, _MM_SHUFFLE(3,3,3,3));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
return _mm_xor_si128(key, key_with_rcon);
}
}
/**
* AES-128 Encryption
*/
void AES_128_Intel::encrypt_n(const byte in[], byte out[], u32bit blocks) const
{
const __m128i* in_mm = (const __m128i*)in;
__m128i* out_mm = (__m128i*)out;
const __m128i* key_mm = (const __m128i*)&EK[0];
__m128i K0 = _mm_loadu_si128(key_mm);
__m128i K1 = _mm_loadu_si128(key_mm + 1);
__m128i K2 = _mm_loadu_si128(key_mm + 2);
__m128i K3 = _mm_loadu_si128(key_mm + 3);
__m128i K4 = _mm_loadu_si128(key_mm + 4);
__m128i K5 = _mm_loadu_si128(key_mm + 5);
__m128i K6 = _mm_loadu_si128(key_mm + 6);
__m128i K7 = _mm_loadu_si128(key_mm + 7);
__m128i K8 = _mm_loadu_si128(key_mm + 8);
__m128i K9 = _mm_loadu_si128(key_mm + 9);
__m128i K10 = _mm_loadu_si128(key_mm + 10);
for(u32bit i = 0; i != blocks; ++i)
{
__m128i B = _mm_loadu_si128(in_mm + i);
B = _mm_xor_si128(B, K0);
B = _mm_aesenc_si128(B, K1);
B = _mm_aesenc_si128(B, K2);
B = _mm_aesenc_si128(B, K3);
B = _mm_aesenc_si128(B, K4);
B = _mm_aesenc_si128(B, K5);
B = _mm_aesenc_si128(B, K6);
B = _mm_aesenc_si128(B, K7);
B = _mm_aesenc_si128(B, K8);
B = _mm_aesenc_si128(B, K9);
B = _mm_aesenclast_si128(B, K10);
_mm_storeu_si128(out_mm + i, B);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/**
* AES-128 Decryption
*/
void AES_128_Intel::decrypt_n(const byte in[], byte out[], u32bit blocks) const
{
const __m128i* in_mm = (const __m128i*)in;
__m128i* out_mm = (__m128i*)out;
const __m128i* key_mm = (const __m128i*)&DK[0];
__m128i K0 = _mm_loadu_si128(key_mm);
__m128i K1 = _mm_loadu_si128(key_mm + 1);
__m128i K2 = _mm_loadu_si128(key_mm + 2);
__m128i K3 = _mm_loadu_si128(key_mm + 3);
__m128i K4 = _mm_loadu_si128(key_mm + 4);
__m128i K5 = _mm_loadu_si128(key_mm + 5);
__m128i K6 = _mm_loadu_si128(key_mm + 6);
__m128i K7 = _mm_loadu_si128(key_mm + 7);
__m128i K8 = _mm_loadu_si128(key_mm + 8);
__m128i K9 = _mm_loadu_si128(key_mm + 9);
__m128i K10 = _mm_loadu_si128(key_mm + 10);
for(u32bit i = 0; i != blocks; ++i)
{
__m128i B = _mm_loadu_si128(in_mm + i);
B = _mm_xor_si128(B, K0);
B = _mm_aesdec_si128(B, K1);
B = _mm_aesdec_si128(B, K2);
B = _mm_aesdec_si128(B, K3);
B = _mm_aesdec_si128(B, K4);
B = _mm_aesdec_si128(B, K5);
B = _mm_aesdec_si128(B, K6);
B = _mm_aesdec_si128(B, K7);
B = _mm_aesdec_si128(B, K8);
B = _mm_aesdec_si128(B, K9);
B = _mm_aesdeclast_si128(B, K10);
_mm_storeu_si128(out_mm + i, B);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/**
* AES-128 Key Schedule
*/
void AES_128_Intel::key_schedule(const byte key[], u32bit)
{
const __m128i* key_mm = (const __m128i*)key;
#define AES_128_key_exp(K, RCON) \
aes_128_key_expansion(K, _mm_aeskeygenassist_si128(K, RCON))
__m128i K0 = _mm_loadu_si128(key_mm);
__m128i K1 = AES_128_key_exp(K0, 0x01);
__m128i K2 = AES_128_key_exp(K1, 0x02);
__m128i K3 = AES_128_key_exp(K2, 0x04);
__m128i K4 = AES_128_key_exp(K3, 0x08);
__m128i K5 = AES_128_key_exp(K4, 0x10);
__m128i K6 = AES_128_key_exp(K5, 0x20);
__m128i K7 = AES_128_key_exp(K6, 0x40);
__m128i K8 = AES_128_key_exp(K7, 0x80);
__m128i K9 = AES_128_key_exp(K8, 0x1B);
__m128i K10 = AES_128_key_exp(K9, 0x36);
__m128i* EK_mm = (__m128i*)&EK[0];
_mm_storeu_si128(EK_mm , K0);
_mm_storeu_si128(EK_mm + 1, K1);
_mm_storeu_si128(EK_mm + 2, K2);
_mm_storeu_si128(EK_mm + 3, K3);
_mm_storeu_si128(EK_mm + 4, K4);
_mm_storeu_si128(EK_mm + 5, K5);
_mm_storeu_si128(EK_mm + 6, K6);
_mm_storeu_si128(EK_mm + 7, K7);
_mm_storeu_si128(EK_mm + 8, K8);
_mm_storeu_si128(EK_mm + 9, K9);
_mm_storeu_si128(EK_mm + 10, K10);
// Now generate decryption keys
__m128i* DK_mm = (__m128i*)&DK[0];
_mm_storeu_si128(DK_mm , K10);
_mm_storeu_si128(DK_mm + 1, _mm_aesimc_si128(K9));
_mm_storeu_si128(DK_mm + 2, _mm_aesimc_si128(K8));
_mm_storeu_si128(DK_mm + 3, _mm_aesimc_si128(K7));
_mm_storeu_si128(DK_mm + 4, _mm_aesimc_si128(K6));
_mm_storeu_si128(DK_mm + 5, _mm_aesimc_si128(K5));
_mm_storeu_si128(DK_mm + 6, _mm_aesimc_si128(K4));
_mm_storeu_si128(DK_mm + 7, _mm_aesimc_si128(K3));
_mm_storeu_si128(DK_mm + 8, _mm_aesimc_si128(K2));
_mm_storeu_si128(DK_mm + 9, _mm_aesimc_si128(K1));
_mm_storeu_si128(DK_mm + 10, K0);
}
/**
* Clear memory of sensitive data
*/
void AES_128_Intel::clear()
{
EK.clear();
DK.clear();
}
}
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