prac/aes.hpp

/* Based on reference code from the Intel AES-NI whitepaper
 * http://www.intel.com/content/dam/doc/white-paper/advanced-encryption-standard-new-instructions-set-paper.pdf
 */

#include <wmmintrin.h>

using AESkey = __m128i[11];

static inline __m128i AES_128_ASSIST (__m128i temp1, __m128i temp2)
{
    __m128i temp3;
    temp2 = _mm_shuffle_epi32 (temp2 ,0xff);
    temp3 = _mm_slli_si128 (temp1, 0x4);
    temp1 = _mm_xor_si128 (temp1, temp3);
    temp3 = _mm_slli_si128 (temp3, 0x4);
    temp1 = _mm_xor_si128 (temp1, temp3);
    temp3 = _mm_slli_si128 (temp3, 0x4);
    temp1 = _mm_xor_si128 (temp1, temp3);
    temp1 = _mm_xor_si128 (temp1, temp2);
    return temp1;
}

static inline void AES_128_Key_Expansion (AESkey &key, __m128i rawkey)
{
    __m128i temp1, temp2;
    __m128i *Key_Schedule = key;
    temp1 = rawkey;
    Key_Schedule[0] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1 ,0x1);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[1] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x2);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[2] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x4);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[3] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x8);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[4] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x10);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[5] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x20);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[6] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x40);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[7] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x80);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[8] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x1b);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[9] = temp1;
    temp2 = _mm_aeskeygenassist_si128 (temp1,0x36);
    temp1 = AES_128_ASSIST(temp1, temp2);
    Key_Schedule[10] = temp1;
}

static inline void AES_ECB_encrypt(__m128i &ciphertext, __m128i plaintext, const AESkey &key)
{
    __m128i tmp;
    int j;
    tmp = plaintext;
    tmp = _mm_xor_si128 (tmp,key[0]);
    for(j=1; j<10; j++){
        tmp = _mm_aesenc_si128 (tmp,key[j]);
    }
    tmp = _mm_aesenclast_si128 (tmp,key[j]);
    ciphertext=tmp;
}