// gcm_simd.cpp - written and placed in the public domain by

//                Jeffrey Walton, Uri Blumenthal and Marcel Raad.

//                Original x86 CLMUL by Wei Dai. ARM and POWER8

//                PMULL and VMULL by JW, UB and MR.

//

//    This source file uses intrinsics to gain access to SSE4.2 and

//    ARMv8a CRC-32 and CRC-32C instructions. A separate source file

//    is needed because additional CXXFLAGS are required to enable

//    the appropriate instructions sets in some build configurations.

#include "pch.h"

#include "config.h"

#include "misc.h"

#if defined(CRYPTOPP_DISABLE_GCM_ASM)

# undef CRYPTOPP_X86_ASM_AVAILABLE

# undef CRYPTOPP_X32_ASM_AVAILABLE

# undef CRYPTOPP_X64_ASM_AVAILABLE

# undef CRYPTOPP_SSE2_ASM_AVAILABLE

#endif

#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)

# include <emmintrin.h>

# include <xmmintrin.h>

#endif

#if (CRYPTOPP_CLMUL_AVAILABLE)

# include <tmmintrin.h>

# include <wmmintrin.h>

#endif

#if (CRYPTOPP_ARM_NEON_HEADER)

# include <stdint.h>

# include <arm_neon.h>

#endif

#if defined(CRYPTOPP_ARM_PMULL_AVAILABLE)

# include "arm_simd.h"

#endif

#if defined(CRYPTOPP_ALTIVEC_AVAILABLE)

# include "ppc_simd.h"

#endif

#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY

# include <signal.h>

# include <setjmp.h>

#endif

#ifndef EXCEPTION_EXECUTE_HANDLER

# define EXCEPTION_EXECUTE_HANDLER 1

#endif

// Squash MS LNK4221 and libtool warnings

extern const char GCM_SIMD_FNAME[] = __FILE__;

NAMESPACE_BEGIN(CryptoPP)

// ************************* Feature Probes ************************* //

#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY

extern "C" {

    typedef void (*SigHandler)(int);

    static jmp_buf s_jmpSIGILL;

    static void SigIllHandler(int)

    {

        longjmp(s_jmpSIGILL, 1);

    }

}

#endif  // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY

#if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8)

bool CPU_ProbePMULL()

{

#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)

    return false;

#elif (CRYPTOPP_ARM_PMULL_AVAILABLE)

# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)

    volatile bool result = true;

    __try

    {

        // Linaro is missing a lot of pmull gear. Also see http://github.com/weidai11/cryptopp/issues/233.

        const uint64_t wa1[]={0,0x9090909090909090}, wb1[]={0,0xb0b0b0b0b0b0b0b0};

        const uint64x2_t a1=vld1q_u64(wa1), b1=vld1q_u64(wb1);

        const uint8_t wa2[]={0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,

                             0xa0,0xa0,0xa0,0xa0,0xa0,0xa0,0xa0,0xa0},

                      wb2[]={0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,

                             0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0};

        const uint8x16_t a2=vld1q_u8(wa2), b2=vld1q_u8(wb2);

        const uint64x2_t r1 = PMULL_00(a1, b1);

        const uint64x2_t r2 = PMULL_11(vreinterpretq_u64_u8(a2),

                                       vreinterpretq_u64_u8(b2));

        result = !!(vgetq_lane_u64(r1,0) == 0x5300530053005300 &&

                    vgetq_lane_u64(r1,1) == 0x5300530053005300 &&

                    vgetq_lane_u64(r2,0) == 0x6c006c006c006c00 &&

                    vgetq_lane_u64(r2,1) == 0x6c006c006c006c00);

    }

    __except (EXCEPTION_EXECUTE_HANDLER)

    {

        return false;

    }

    return result;

# else

    // longjmp and clobber warnings. Volatile is required.

    volatile bool result = true;

    volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);

    if (oldHandler == SIG_ERR)

        return false;

    volatile sigset_t oldMask;

    if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))

    {

        signal(SIGILL, oldHandler);

        return false;

    }

    if (setjmp(s_jmpSIGILL))

        result = false;

    else

    {

        // Linaro is missing a lot of pmull gear. Also see http://github.com/weidai11/cryptopp/issues/233.

        const uint64_t wa1[]={0,0x9090909090909090}, wb1[]={0,0xb0b0b0b0b0b0b0b0};

        const uint64x2_t a1=vld1q_u64(wa1), b1=vld1q_u64(wb1);

        const uint8_t wa2[]={0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,

                             0xa0,0xa0,0xa0,0xa0,0xa0,0xa0,0xa0,0xa0},

                      wb2[]={0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,0xc0,

                             0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0,0xe0};

        const uint8x16_t a2=vld1q_u8(wa2), b2=vld1q_u8(wb2);

        const uint64x2_t r1 = PMULL_00(a1, b1);

        const uint64x2_t r2 = PMULL_11(vreinterpretq_u64_u8(a2),

                                       vreinterpretq_u64_u8(b2));

        result = !!(vgetq_lane_u64(r1,0) == 0x5300530053005300 &&

                    vgetq_lane_u64(r1,1) == 0x5300530053005300 &&

                    vgetq_lane_u64(r2,0) == 0x6c006c006c006c00 &&

                    vgetq_lane_u64(r2,1) == 0x6c006c006c006c00);

    }

    sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);

    signal(SIGILL, oldHandler);

    return result;

# endif

#else

    return false;

#endif  // CRYPTOPP_ARM_PMULL_AVAILABLE

}

#endif  // ARM32 or ARM64

// *************************** ARM NEON *************************** //

#if CRYPTOPP_ARM_NEON_AVAILABLE

void GCM_Xor16_NEON(byte *a, const byte *b, const byte *c)

{

  vst1q_u8(a, veorq_u8(vld1q_u8(b), vld1q_u8(c)));

}

#endif  // CRYPTOPP_ARM_NEON_AVAILABLE

#if CRYPTOPP_ARM_PMULL_AVAILABLE

// Swaps high and low 64-bit words

inline uint64x2_t SwapWords(const uint64x2_t& data)

{

    return (uint64x2_t)vcombine_u64(

        vget_high_u64(data), vget_low_u64(data));

}

uint64x2_t GCM_Reduce_PMULL(uint64x2_t c0, uint64x2_t c1, uint64x2_t c2, const uint64x2_t &r)

{

    c1 = veorq_u64(c1, VEXT_U8<8>(vdupq_n_u64(0), c0));

    c1 = veorq_u64(c1, PMULL_01(c0, r));

    c0 = VEXT_U8<8>(c0, vdupq_n_u64(0));

    c0 = vshlq_n_u64(veorq_u64(c0, c1), 1);

    c0 = PMULL_00(c0, r);

    c2 = veorq_u64(c2, c0);

    c2 = veorq_u64(c2, VEXT_U8<8>(c1, vdupq_n_u64(0)));

    c1 = vshrq_n_u64(vcombine_u64(vget_low_u64(c1), vget_low_u64(c2)), 63);

    c2 = vshlq_n_u64(c2, 1);

    return veorq_u64(c2, c1);

}

uint64x2_t GCM_Multiply_PMULL(const uint64x2_t &x, const uint64x2_t &h, const uint64x2_t &r)

{

    const uint64x2_t c0 = PMULL_00(x, h);

    const uint64x2_t c1 = veorq_u64(PMULL_10(x, h), PMULL_01(x, h));

    const uint64x2_t c2 = PMULL_11(x, h);

    return GCM_Reduce_PMULL(c0, c1, c2, r);

}

void GCM_SetKeyWithoutResync_PMULL(const byte *hashKey, byte *mulTable, unsigned int tableSize)

{

    const uint64x2_t r = {0xe100000000000000ull, 0xc200000000000000ull};

    const uint64x2_t t = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(hashKey)));

    const uint64x2_t h0 = vextq_u64(t, t, 1);

    uint64x2_t h = h0;

    unsigned int i;

    for (i=0; i<tableSize-32; i+=32)

    {

        const uint64x2_t h1 = GCM_Multiply_PMULL(h, h0, r);

        vst1_u64(UINT64_CAST(mulTable+i), vget_low_u64(h));

        vst1q_u64(UINT64_CAST(mulTable+i+16), h1);

        vst1q_u64(UINT64_CAST(mulTable+i+8), h);

        vst1_u64(UINT64_CAST(mulTable+i+8), vget_low_u64(h1));

        h = GCM_Multiply_PMULL(h1, h0, r);

    }

    const uint64x2_t h1 = GCM_Multiply_PMULL(h, h0, r);

    vst1_u64(UINT64_CAST(mulTable+i), vget_low_u64(h));

    vst1q_u64(UINT64_CAST(mulTable+i+16), h1);

    vst1q_u64(UINT64_CAST(mulTable+i+8), h);

    vst1_u64(UINT64_CAST(mulTable+i+8), vget_low_u64(h1));

}

size_t GCM_AuthenticateBlocks_PMULL(const byte *data, size_t len, const byte *mtable, byte *hbuffer)

{

    const uint64x2_t r = {0xe100000000000000ull, 0xc200000000000000ull};

    uint64x2_t x = vreinterpretq_u64_u8(vld1q_u8(hbuffer));

    while (len >= 16)

    {

        size_t i=0, s = UnsignedMin(len/16U, 8U);

        uint64x2_t d1, d2 = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(data+(s-1)*16U)));

        uint64x2_t c0 = vdupq_n_u64(0);

        uint64x2_t c1 = vdupq_n_u64(0);

        uint64x2_t c2 = vdupq_n_u64(0);

        while (true)

        {

            const uint64x2_t h0 = vld1q_u64(CONST_UINT64_CAST(mtable+(i+0)*16));

            const uint64x2_t h1 = vld1q_u64(CONST_UINT64_CAST(mtable+(i+1)*16));

            const uint64x2_t h2 = veorq_u64(h0, h1);

            if (++i == s)

            {

                const uint64x2_t t1 = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(data)));

                d1 = veorq_u64(vextq_u64(t1, t1, 1), x);

                c0 = veorq_u64(c0, PMULL_00(d1, h0));

                c2 = veorq_u64(c2, PMULL_10(d1, h1));

                d1 = veorq_u64(d1, SwapWords(d1));

                c1 = veorq_u64(c1, PMULL_00(d1, h2));

                break;

            }

            d1 = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(data+(s-i)*16-8)));

            c0 = veorq_u64(c0, PMULL_10(d2, h0));

            c2 = veorq_u64(c2, PMULL_10(d1, h1));

            d2 = veorq_u64(d2, d1);

            c1 = veorq_u64(c1, PMULL_10(d2, h2));

            if (++i == s)

            {

                const uint64x2_t t2 = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(data)));

                d1 = veorq_u64(vextq_u64(t2, t2, 1), x);

                c0 = veorq_u64(c0, PMULL_01(d1, h0));

                c2 = veorq_u64(c2, PMULL_11(d1, h1));

                d1 = veorq_u64(d1, SwapWords(d1));

                c1 = veorq_u64(c1, PMULL_01(d1, h2));

                break;

            }

            const uint64x2_t t3 = vreinterpretq_u64_u8(vrev64q_u8(vld1q_u8(data+(s-i)*16-8)));

            d2 = vextq_u64(t3, t3, 1);

            c0 = veorq_u64(c0, PMULL_01(d1, h0));

            c2 = veorq_u64(c2, PMULL_01(d2, h1));

            d1 = veorq_u64(d1, d2);

            c1 = veorq_u64(c1, PMULL_01(d1, h2));

        }

        data += s*16;

        len -= s*16;

        c1 = veorq_u64(veorq_u64(c1, c0), c2);

        x = GCM_Reduce_PMULL(c0, c1, c2, r);

    }

    vst1q_u64(UINT64_CAST(hbuffer), x);

    return len;

}

void GCM_ReverseHashBufferIfNeeded_PMULL(byte *hashBuffer)

{

    if (GetNativeByteOrder() != BIG_ENDIAN_ORDER)

    {

        const uint8x16_t x = vrev64q_u8(vld1q_u8(hashBuffer));

        vst1q_u8(hashBuffer, vextq_u8(x, x, 8));

    }

}

#endif  // CRYPTOPP_ARM_PMULL_AVAILABLE

// ***************************** SSE ***************************** //

#if CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE

// SunCC 5.10-5.11 compiler crash. Move GCM_Xor16_SSE2 out-of-line, and place in

// a source file with a SSE architecture switch. Also see GH #226 and GH #284.

void GCM_Xor16_SSE2(byte *a, const byte *b, const byte *c)

{

# if CRYPTOPP_SSE2_ASM_AVAILABLE && defined(__GNUC__)

    asm ("movdqa %1, %%xmm0; pxor %2, %%xmm0; movdqa %%xmm0, %0;"

         : "=m" (a[0]) : "m"(b[0]), "m"(c[0]));

# else  // CRYPTOPP_SSE2_INTRIN_AVAILABLE

    _mm_store_si128(M128_CAST(a), _mm_xor_si128(

        _mm_load_si128(CONST_M128_CAST(b)),

        _mm_load_si128(CONST_M128_CAST(c))));

# endif

}

#endif  // CRYPTOPP_SSE2_ASM_AVAILABLE

#if CRYPTOPP_CLMUL_AVAILABLE

#if 0

// preserved for testing

void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c)

{

    word64 Z0=0, Z1=0, V0, V1;

    typedef BlockGetAndPut<word64, BigEndian> Block;

    Block::Get(a)(V0)(V1);

    for (int i=0; i<16; i++)

    {

        for (int j=0x80; j!=0; j>>=1)

        {

            int x = b[i] & j;

            Z0 ^= x ? V0 : 0;

            Z1 ^= x ? V1 : 0;

            x = (int)V1 & 1;

            V1 = (V1>>1) | (V0<<63);

            V0 = (V0>>1) ^ (x ? W64LIT(0xe1) << 56 : 0);

        }

    }

    Block::Put(NULLPTR, c)(Z0)(Z1);

}

__m128i _mm_clmulepi64_si128(const __m128i &a, const __m128i &b, int i)

{

    word64 A[1] = {ByteReverse(((word64*)&a)[i&1])};

    word64 B[1] = {ByteReverse(((word64*)&b)[i>>4])};

    PolynomialMod2 pa((byte *)A, 8);

    PolynomialMod2 pb((byte *)B, 8);

    PolynomialMod2 c = pa*pb;

    __m128i output;

    for (int i=0; i<16; i++)

        ((byte *)&output)[i] = c.GetByte(i);

    return output;

}

#endif  // Testing

// Swaps high and low 64-bit words

inline __m128i SwapWords(const __m128i& val)

{

    return _mm_shuffle_epi32(val, _MM_SHUFFLE(1, 0, 3, 2));

}

// SunCC 5.11-5.15 compiler crash. Make the function inline

// and parameters non-const. Also see GH #188 and GH #224.

inline __m128i GCM_Reduce_CLMUL(__m128i c0, __m128i c1, __m128i c2, const __m128i& r)

{

    /*

    The polynomial to be reduced is c0 * x^128 + c1 * x^64 + c2. c0t below refers to the most

    significant half of c0 as a polynomial, which, due to GCM's bit reflection, are in the

    rightmost bit positions, and the lowest byte addresses.

    c1 ^= c0t * 0xc200000000000000

    c2t ^= c0t

    t = shift (c1t ^ c0b) left 1 bit

    c2 ^= t * 0xe100000000000000

    c2t ^= c1b

    shift c2 left 1 bit and xor in lowest bit of c1t

    */

    c1 = _mm_xor_si128(c1, _mm_slli_si128(c0, 8));

    c1 = _mm_xor_si128(c1, _mm_clmulepi64_si128(c0, r, 0x10));

    c0 = _mm_xor_si128(c1, _mm_srli_si128(c0, 8));

    c0 = _mm_slli_epi64(c0, 1);

    c0 = _mm_clmulepi64_si128(c0, r, 0);

    c2 = _mm_xor_si128(c2, c0);

    c2 = _mm_xor_si128(c2, _mm_srli_si128(c1, 8));

    c1 = _mm_unpacklo_epi64(c1, c2);

    c1 = _mm_srli_epi64(c1, 63);

    c2 = _mm_slli_epi64(c2, 1);

    return _mm_xor_si128(c2, c1);

}

// SunCC 5.13-5.14 compiler crash. Don't make the function inline.

// This is in contrast to GCM_Reduce_CLMUL, which must be inline.

__m128i GCM_Multiply_CLMUL(const __m128i &x, const __m128i &h, const __m128i &r)

{

    const __m128i c0 = _mm_clmulepi64_si128(x,h,0);

    const __m128i c1 = _mm_xor_si128(_mm_clmulepi64_si128(x,h,1), _mm_clmulepi64_si128(x,h,0x10));

    const __m128i c2 = _mm_clmulepi64_si128(x,h,0x11);

    return GCM_Reduce_CLMUL(c0, c1, c2, r);

}

void GCM_SetKeyWithoutResync_CLMUL(const byte *hashKey, byte *mulTable, unsigned int tableSize)

{

    const __m128i r = _mm_set_epi32(0xc2000000, 0x00000000, 0xe1000000, 0x00000000);

    const __m128i m = _mm_set_epi32(0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f);

    __m128i h0 = _mm_shuffle_epi8(_mm_load_si128(CONST_M128_CAST(hashKey)), m), h = h0;

    unsigned int i;

    for (i=0; i<tableSize-32; i+=32)

    {

        const __m128i h1 = GCM_Multiply_CLMUL(h, h0, r);

        _mm_storel_epi64(M128_CAST(mulTable+i), h);

        _mm_storeu_si128(M128_CAST(mulTable+i+16), h1);

        _mm_storeu_si128(M128_CAST(mulTable+i+8), h);

        _mm_storel_epi64(M128_CAST(mulTable+i+8), h1);

        h = GCM_Multiply_CLMUL(h1, h0, r);

    }

    const __m128i h1 = GCM_Multiply_CLMUL(h, h0, r);

    _mm_storel_epi64(M128_CAST(mulTable+i), h);

    _mm_storeu_si128(M128_CAST(mulTable+i+16), h1);

    _mm_storeu_si128(M128_CAST(mulTable+i+8), h);

    _mm_storel_epi64(M128_CAST(mulTable+i+8), h1);

}

size_t GCM_AuthenticateBlocks_CLMUL(const byte *data, size_t len, const byte *mtable, byte *hbuffer)

{

    const __m128i r = _mm_set_epi32(0xc2000000, 0x00000000, 0xe1000000, 0x00000000);

    const __m128i m1 = _mm_set_epi32(0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f);

    const __m128i m2 = _mm_set_epi32(0x08090a0b, 0x0c0d0e0f, 0x00010203, 0x04050607);

    __m128i x = _mm_load_si128(M128_CAST(hbuffer));

    while (len >= 16)

    {

        size_t i=0, s = UnsignedMin(len/16, 8U);

        __m128i d1 = _mm_loadu_si128(CONST_M128_CAST(data+(s-1)*16));

        __m128i d2 = _mm_shuffle_epi8(d1, m2);

        __m128i c0 = _mm_setzero_si128();

        __m128i c1 = _mm_setzero_si128();

        __m128i c2 = _mm_setzero_si128();

        while (true)

        {

            const __m128i h0 = _mm_load_si128(CONST_M128_CAST(mtable+(i+0)*16));

            const __m128i h1 = _mm_load_si128(CONST_M128_CAST(mtable+(i+1)*16));

            const __m128i h2 = _mm_xor_si128(h0, h1);

            if (++i == s)

            {

                d1 = _mm_shuffle_epi8(_mm_loadu_si128(CONST_M128_CAST(data)), m1);

                d1 = _mm_xor_si128(d1, x);

                c0 = _mm_xor_si128(c0, _mm_clmulepi64_si128(d1, h0, 0));

                c2 = _mm_xor_si128(c2, _mm_clmulepi64_si128(d1, h1, 1));

                d1 = _mm_xor_si128(d1, SwapWords(d1));

                c1 = _mm_xor_si128(c1, _mm_clmulepi64_si128(d1, h2, 0));

                break;

            }

            d1 = _mm_shuffle_epi8(_mm_loadu_si128(CONST_M128_CAST(data+(s-i)*16-8)), m2);

            c0 = _mm_xor_si128(c0, _mm_clmulepi64_si128(d2, h0, 1));

            c2 = _mm_xor_si128(c2, _mm_clmulepi64_si128(d1, h1, 1));

            d2 = _mm_xor_si128(d2, d1);

            c1 = _mm_xor_si128(c1, _mm_clmulepi64_si128(d2, h2, 1));

            if (++i == s)

            {

                d1 = _mm_shuffle_epi8(_mm_loadu_si128(CONST_M128_CAST(data)), m1);

                d1 = _mm_xor_si128(d1, x);

                c0 = _mm_xor_si128(c0, _mm_clmulepi64_si128(d1, h0, 0x10));

                c2 = _mm_xor_si128(c2, _mm_clmulepi64_si128(d1, h1, 0x11));

                d1 = _mm_xor_si128(d1, SwapWords(d1));

                c1 = _mm_xor_si128(c1, _mm_clmulepi64_si128(d1, h2, 0x10));

                break;

            }

            d2 = _mm_shuffle_epi8(_mm_loadu_si128(CONST_M128_CAST(data+(s-i)*16-8)), m1);

            c0 = _mm_xor_si128(c0, _mm_clmulepi64_si128(d1, h0, 0x10));

            c2 = _mm_xor_si128(c2, _mm_clmulepi64_si128(d2, h1, 0x10));

            d1 = _mm_xor_si128(d1, d2);

            c1 = _mm_xor_si128(c1, _mm_clmulepi64_si128(d1, h2, 0x10));

        }

        data += s*16;

        len -= s*16;

        c1 = _mm_xor_si128(_mm_xor_si128(c1, c0), c2);

        x = GCM_Reduce_CLMUL(c0, c1, c2, r);

    }

    _mm_store_si128(M128_CAST(hbuffer), x);

    return len;

}

void GCM_ReverseHashBufferIfNeeded_CLMUL(byte *hashBuffer)

{

    // SSSE3 instruction, but only used with CLMUL

    const __m128i mask = _mm_set_epi32(0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f);

    _mm_storeu_si128(M128_CAST(hashBuffer), _mm_shuffle_epi8(

        _mm_loadu_si128(CONST_M128_CAST(hashBuffer)), mask));

}

#endif  // CRYPTOPP_CLMUL_AVAILABLE

// ***************************** POWER8 ***************************** //

#if CRYPTOPP_POWER8_AVAILABLE

void GCM_Xor16_POWER8(byte *a, const byte *b, const byte *c)

{

    VecStore(VecXor(VecLoad(b), VecLoad(c)), a);

}

#endif  // CRYPTOPP_POWER8_AVAILABLE

#if CRYPTOPP_POWER8_VMULL_AVAILABLE

uint64x2_p GCM_Reduce_VMULL(uint64x2_p c0, uint64x2_p c1, uint64x2_p c2, uint64x2_p r)

{

    const uint64x2_p m1 = {1,1}, m63 = {63,63};

    c1 = VecXor(c1, VecShiftRightOctet<8>(c0));

    c1 = VecXor(c1, VecIntelMultiply10(c0, r));

    c0 = VecXor(c1, VecShiftLeftOctet<8>(c0));

    c0 = VecIntelMultiply00(vec_sl(c0, m1), r);

    c2 = VecXor(c2, c0);

    c2 = VecXor(c2, VecShiftLeftOctet<8>(c1));

    c1 = vec_sr(vec_mergeh(c1, c2), m63);

    c2 = vec_sl(c2, m1);

    return VecXor(c2, c1);

}

inline uint64x2_p GCM_Multiply_VMULL(uint64x2_p x, uint64x2_p h, uint64x2_p r)

{

    const uint64x2_p c0 = VecIntelMultiply00(x, h);

    const uint64x2_p c1 = VecXor(VecIntelMultiply01(x, h), VecIntelMultiply10(x, h));

    const uint64x2_p c2 = VecIntelMultiply11(x, h);

    return GCM_Reduce_VMULL(c0, c1, c2, r);

}

inline uint64x2_p LoadHashKey(const byte *hashKey)

{

#if (CRYPTOPP_BIG_ENDIAN)

    const uint64x2_p key = (uint64x2_p)VecLoad(hashKey);

    const uint8x16_p mask = {8,9,10,11, 12,13,14,15, 0,1,2,3, 4,5,6,7};

    return VecPermute(key, key, mask);

#else

    const uint64x2_p key = (uint64x2_p)VecLoad(hashKey);

    const uint8x16_p mask = {15,14,13,12, 11,10,9,8, 7,6,5,4, 3,2,1,0};

    return VecPermute(key, key, mask);

#endif

}

void GCM_SetKeyWithoutResync_VMULL(const byte *hashKey, byte *mulTable, unsigned int tableSize)

{

    const uint64x2_p r = {0xe100000000000000ull, 0xc200000000000000ull};

    uint64x2_p h = LoadHashKey(hashKey), h0 = h;

    unsigned int i;

    uint64_t temp[2];

    for (i=0; i<tableSize-32; i+=32)

    {

        const uint64x2_p h1 = GCM_Multiply_VMULL(h, h0, r);

        VecStore(h, (byte*)temp);

        std::memcpy(mulTable+i, temp+0, 8);

        VecStore(h1, mulTable+i+16);

        VecStore(h, mulTable+i+8);

        VecStore(h1, (byte*)temp);

        std::memcpy(mulTable+i+8, temp+0, 8);

        h = GCM_Multiply_VMULL(h1, h0, r);

    }

    const uint64x2_p h1 = GCM_Multiply_VMULL(h, h0, r);

    VecStore(h, (byte*)temp);

    std::memcpy(mulTable+i, temp+0, 8);

    VecStore(h1, mulTable+i+16);

    VecStore(h, mulTable+i+8);

    VecStore(h1, (byte*)temp);

    std::memcpy(mulTable+i+8, temp+0, 8);

}

// Swaps high and low 64-bit words

template <class T>

inline T SwapWords(const T& data)

{

    return (T)VecRotateLeftOctet<8>(data);

}

inline uint64x2_p LoadBuffer1(const byte *dataBuffer)

{

#if (CRYPTOPP_BIG_ENDIAN)

    return (uint64x2_p)VecLoad(dataBuffer);

#else

    const uint64x2_p data = (uint64x2_p)VecLoad(dataBuffer);

    const uint8x16_p mask = {7,6,5,4, 3,2,1,0, 15,14,13,12, 11,10,9,8};

    return VecPermute(data, data, mask);

#endif

}

inline uint64x2_p LoadBuffer2(const byte *dataBuffer)

{

#if (CRYPTOPP_BIG_ENDIAN)

    return (uint64x2_p)SwapWords(VecLoadBE(dataBuffer));

#else

    return (uint64x2_p)VecLoadBE(dataBuffer);

#endif

}

size_t GCM_AuthenticateBlocks_VMULL(const byte *data, size_t len, const byte *mtable, byte *hbuffer)

{

    const uint64x2_p r = {0xe100000000000000ull, 0xc200000000000000ull};

    uint64x2_p x = (uint64x2_p)VecLoad(hbuffer);

    while (len >= 16)

    {

        size_t i=0, s = UnsignedMin(len/16, 8U);

        uint64x2_p d1, d2 = LoadBuffer1(data+(s-1)*16);

        uint64x2_p c0 = {0}, c1 = {0}, c2 = {0};

        while (true)

        {

            const uint64x2_p h0 = (uint64x2_p)VecLoad(mtable+(i+0)*16);

            const uint64x2_p h1 = (uint64x2_p)VecLoad(mtable+(i+1)*16);

            const uint64x2_p h2 = (uint64x2_p)VecXor(h0, h1);

            if (++i == s)

            {

                d1 = LoadBuffer2(data);

                d1 = VecXor(d1, x);

                c0 = VecXor(c0, VecIntelMultiply00(d1, h0));

                c2 = VecXor(c2, VecIntelMultiply01(d1, h1));

                d1 = VecXor(d1, SwapWords(d1));

                c1 = VecXor(c1, VecIntelMultiply00(d1, h2));

                break;

            }

            d1 = LoadBuffer1(data+(s-i)*16-8);

            c0 = VecXor(c0, VecIntelMultiply01(d2, h0));

            c2 = VecXor(c2, VecIntelMultiply01(d1, h1));

            d2 = VecXor(d2, d1);

            c1 = VecXor(c1, VecIntelMultiply01(d2, h2));

            if (++i == s)

            {

                d1 = LoadBuffer2(data);

                d1 = VecXor(d1, x);

                c0 = VecXor(c0, VecIntelMultiply10(d1, h0));

                c2 = VecXor(c2, VecIntelMultiply11(d1, h1));

                d1 = VecXor(d1, SwapWords(d1));

                c1 = VecXor(c1, VecIntelMultiply10(d1, h2));

                break;

            }

            d2 = LoadBuffer2(data+(s-i)*16-8);

            c0 = VecXor(c0, VecIntelMultiply10(d1, h0));

            c2 = VecXor(c2, VecIntelMultiply10(d2, h1));

            d1 = VecXor(d1, d2);

            c1 = VecXor(c1, VecIntelMultiply10(d1, h2));

        }

        data += s*16;

        len -= s*16;

        c1 = VecXor(VecXor(c1, c0), c2);

        x = GCM_Reduce_VMULL(c0, c1, c2, r);

    }

    VecStore(x, hbuffer);

    return len;

}

void GCM_ReverseHashBufferIfNeeded_VMULL(byte *hashBuffer)

{

    const uint64x2_p mask = {0x08090a0b0c0d0e0full, 0x0001020304050607ull};

    VecStore(VecPermute(VecLoad(hashBuffer), mask), hashBuffer);

}

#endif  // CRYPTOPP_POWER8_VMULL_AVAILABLE

NAMESPACE_END