aes.h

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/* crypto/aes/aes.h -*- mode:C; c-file-style: "eay" -*- */
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#ifndef LIBGARBLE_AES_H
#define LIBGARBLE_AES_H

#include "block.h"
    
typedef struct { block rd_key[11]; unsigned int rounds; } AES_KEY;

#define EXPAND_ASSIST(v1,v2,v3,v4,shuff_const,aes_const)                    \
    v2 = _mm_aeskeygenassist_si128(v4,aes_const);                           \
    v3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(v3),              \
                                         _mm_castsi128_ps(v1), 16));        \
    v1 = _mm_xor_si128(v1,v3);                                              \
    v3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(v3),              \
                                         _mm_castsi128_ps(v1), 140));       \
    v1 = _mm_xor_si128(v1,v3);                                              \
    v2 = _mm_shuffle_epi32(v2,shuff_const);                                 \
    v1 = _mm_xor_si128(v1,v2)

static inline void
AES_set_encrypt_key(const block userkey, AES_KEY *key)
{
    block x0, x1, x2;
    block *kp = key->rd_key;
    kp[0] = x0 = userkey;
    x2 = _mm_setzero_si128();
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 1);
    kp[1] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 2);
    kp[2] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 4);
    kp[3] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 8);
    kp[4] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 16);
    kp[5] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 32);
    kp[6] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 64);
    kp[7] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 128);
    kp[8] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 27);
    kp[9] = x0;
    EXPAND_ASSIST(x0, x1, x2, x0, 255, 54);
    kp[10] = x0;
    key->rounds = 10;
}

static inline void
AES_ecb_encrypt_blks(block *blks, unsigned int nblks, const AES_KEY *key)
{
    for (unsigned int i = 0; i < nblks; ++i)
        blks[i] = _mm_xor_si128(blks[i], key->rd_key[0]);
    for (unsigned int j = 1; j < key->rounds; ++j)
        for (unsigned int i = 0; i < nblks; ++i)
            blks[i] = _mm_aesenc_si128(blks[i], key->rd_key[j]);
    for (unsigned int i = 0; i < nblks; ++i)
        blks[i] = _mm_aesenclast_si128(blks[i], key->rd_key[key->rounds]);
}

static inline void
AES_set_decrypt_key_fast(AES_KEY *dkey, const AES_KEY *ekey)
{
    int j = 0;
    int i = ekey->rounds;
#if (OCB_KEY_LEN == 0)
    dkey->rounds = i;
#endif
    dkey->rd_key[i--] = ekey->rd_key[j++];
    while (i)
        dkey->rd_key[i--] = _mm_aesimc_si128(ekey->rd_key[j++]);
    dkey->rd_key[i] = ekey->rd_key[j];
}

static inline void
AES_set_decrypt_key(block userkey, AES_KEY *key)
{
    AES_KEY temp_key;
    AES_set_encrypt_key(userkey, &temp_key);
    AES_set_decrypt_key_fast(key, &temp_key);
}

static inline void
AES_ecb_decrypt_blks(block *blks, unsigned nblks, const AES_KEY *key)
{
    unsigned i, j, rnds = key->rounds;
    for (i = 0; i < nblks; ++i)
        blks[i] = _mm_xor_si128(blks[i], key->rd_key[0]);
    for (j = 1; j < rnds; ++j)
        for (i = 0; i < nblks; ++i)
            blks[i] = _mm_aesdec_si128(blks[i], key->rd_key[j]);
    for (i = 0; i < nblks; ++i)
        blks[i] = _mm_aesdeclast_si128(blks[i], key->rd_key[j]);
}

#endif