ars.h

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/*
Copyright 2010-2011, D. E. Shaw Research.
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  contributors may be used to endorse or promote products derived from
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#ifndef __Random123_ars_dot_hpp__
#define __Random123_ars_dot_hpp__

#include "features/compilerfeatures.h"
#include "array.h"

#if R123_USE_AES_NI

#ifndef ARS1xm128i_DEFAULT_ROUNDS
#define ARS1xm128i_DEFAULT_ROUNDS 7
#endif

enum r123_enum_ars1xm128i {ars1xm128i_rounds = ARS1xm128i_DEFAULT_ROUNDS};

/* ARS1xm128i with Weyl keys.  Fast, and Crush-resistant, but NOT CRYPTO. */
typedef struct r123array1xm128i ars1xm128i_ctr_t;
typedef struct r123array1xm128i ars1xm128i_key_t;
typedef struct r123array1xm128i ars1xm128i_ukey_t;
R123_STATIC_INLINE ars1xm128i_key_t ars1xm128ikeyinit(ars1xm128i_ukey_t uk) { return uk; }
R123_STATIC_INLINE ars1xm128i_ctr_t ars1xm128i_R(unsigned int Nrounds, ars1xm128i_ctr_t in, ars1xm128i_key_t k){
    __m128i kweyl = _mm_set_epi64x(R123_64BIT(0xBB67AE8584CAA73B), /* sqrt(3) - 1.0 */
                                   R123_64BIT(0x9E3779B97F4A7C15)); /* golden ratio */
    /* N.B.  the aesenc instructions do the xor *after*
    // so if we want to follow the AES pattern, we
    // have to do the initial xor explicitly */
    __m128i kk = k.v[0].m;
    __m128i v = _mm_xor_si128(in.v[0].m, kk);
    ars1xm128i_ctr_t ret;
    R123_ASSERT(Nrounds<=10);
    if( Nrounds>1 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>2 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>3 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>4 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>5 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>6 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>7 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>8 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    if( Nrounds>9 ){
        kk = _mm_add_epi64(kk, kweyl);
        v = _mm_aesenc_si128(v, kk);
    }
    kk = _mm_add_epi64(kk, kweyl);
    v = _mm_aesenclast_si128(v, kk);
    ret.v[0].m = v;
    return ret;
}

#define ars1xm128i(c,k) ars1xm128i_R(ars1xm128i_rounds, c, k)

typedef struct r123array4x32 ars4x32_ctr_t;
typedef struct r123array4x32 ars4x32_key_t;
typedef struct r123array4x32 ars4x32_ukey_t;
enum r123_enum_ars4x32 {ars4x32_rounds = ARS1xm128i_DEFAULT_ROUNDS};
R123_STATIC_INLINE ars4x32_key_t ars4x32keyinit(ars4x32_ukey_t uk) { return uk; }
R123_STATIC_INLINE ars4x32_ctr_t ars4x32_R(unsigned int Nrounds, ars4x32_ctr_t c, ars4x32_key_t k){
    ars1xm128i_ctr_t c128;
    ars1xm128i_key_t k128;
    c128.v[0].m = _mm_set_epi32(c.v[3], c.v[2], c.v[1], c.v[0]);
    k128.v[0].m = _mm_set_epi32(k.v[3], k.v[2], k.v[1], k.v[0]);
    c128 = ars1xm128i_R(Nrounds, c128, k128);
    _mm_storeu_si128((__m128i*)&c.v[0], c128.v[0].m);
    return c;
}

#define ars4x32(c,k) ars4x32_R(ars4x32_rounds, c, k)

#ifdef __cplusplus
namespace r123{
template<unsigned int ROUNDS>
struct ARS1xm128i_R{
    typedef ars1xm128i_ctr_t ctr_type;
    typedef ars1xm128i_key_t key_type;
    typedef ars1xm128i_key_t ukey_type;
    static const unsigned int rounds=ROUNDS;
    R123_FORCE_INLINE(ctr_type operator()(ctr_type ctr, key_type key) const){
        return ars1xm128i_R(ROUNDS, ctr, key);
    }
};

template<unsigned int ROUNDS>
struct ARS4x32_R{
    typedef ars4x32_ctr_t ctr_type;
    typedef ars4x32_key_t key_type;
    typedef ars4x32_key_t ukey_type;
    static const unsigned int rounds=ROUNDS;
    R123_FORCE_INLINE(ctr_type operator()(ctr_type ctr, key_type key) const){
        return ars4x32_R(ROUNDS, ctr, key);
    }
};
typedef ARS1xm128i_R<ars1xm128i_rounds> ARS1xm128i;
typedef ARS4x32_R<ars4x32_rounds> ARS4x32;
} // namespace r123

#endif /* __cplusplus */

#endif /* R123_USE_AES_NI */

#endif