Random123/ars.h

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/*
Copyright 2010-2011, D. E. Shaw Research.
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modification, are permitted provided that the following conditions are
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* Redistributions in binary form must reproduce the above copyright
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  documentation and/or other materials provided with the distribution.

* Neither the name of D. E. Shaw Research nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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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 {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 {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