// vmac.cpp - written and placed in the public domain by Wei Dai
// based on Ted Krovetz's public domain vmac.c and draft-krovetz-vmac-01.txt
#include "pch.h"
#include "vmac.h"
#include "argnames.h"
#include "cpu.h"
NAMESPACE_BEGIN(CryptoPP)
#if defined(_MSC_VER) && !CRYPTOPP_BOOL_SLOW_WORD64
#include <intrin.h>
#endif
#define VMAC_BOOL_WORD128 (defined(CRYPTOPP_WORD128_AVAILABLE) && !defined(CRYPTOPP_X64_ASM_AVAILABLE))
#ifdef __BORLANDC__
#define const // Turbo C++ 2006 workaround
#endif
static const word64 p64 = W64LIT(0xfffffffffffffeff); /* 2^64 - 257 prime */
static const word64 m62 = W64LIT(0x3fffffffffffffff); /* 62-bit mask */
static const word64 m63 = W64LIT(0x7fffffffffffffff); /* 63-bit mask */
static const word64 m64 = W64LIT(0xffffffffffffffff); /* 64-bit mask */
static const word64 mpoly = W64LIT(0x1fffffff1fffffff); /* Poly key mask */
#ifdef __BORLANDC__
#undef const
#endif
#if VMAC_BOOL_WORD128
#ifdef __powerpc__
// workaround GCC Bug 31690: ICE with const __uint128_t and C++ front-end
#define m126 ((word128(m62)<<64)|m64)
#else
static const word128 m126 = (word128(m62)<<64)|m64; /* 126-bit mask */
#endif
#endif
void VMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms)
{
int digestLength = params.GetIntValueWithDefault(Name::DigestSize(), DefaultDigestSize());
if (digestLength != 8 && digestLength != 16)
throw InvalidArgument("VMAC: DigestSize must be 8 or 16");
m_is128 = digestLength == 16;
m_L1KeyLength = params.GetIntValueWithDefault(Name::L1KeyLength(), 128);
if (m_L1KeyLength <= 0 || m_L1KeyLength % 128 != 0)
throw InvalidArgument("VMAC: L1KeyLength must be a positive multiple of 128");
AllocateBlocks();
BlockCipher &cipher = AccessCipher();
cipher.SetKey(userKey, keylength, params);
unsigned int blockSize = cipher.BlockSize();
unsigned int blockSizeInWords = blockSize / sizeof(word64);
SecBlock<word64> out(blockSizeInWords);
SecByteBlock in;
in.CleanNew(blockSize);
size_t i;
/* Fill nh key */
in[0] = 0x80;
cipher.AdvancedProcessBlocks(in, NULL, (byte *)m_nhKey(), m_nhKeySize()*sizeof(word64), cipher.BT_InBlockIsCounter);
ConditionalByteReverse<word64>(BIG_ENDIAN_ORDER, m_nhKey(), m_nhKey(), m_nhKeySize()*sizeof(word64));
/* Fill poly key */
in[0] = 0xC0;
in[15] = 0;
for (i = 0; i <= (size_t)m_is128; i++)
{
cipher.ProcessBlock(in, out.BytePtr());
m_polyState()[i*4+2] = GetWord<word64>(true, BIG_ENDIAN_ORDER, out.BytePtr()) & mpoly;
m_polyState()[i*4+3] = GetWord<word64>(true, BIG_ENDIAN_ORDER, out.BytePtr()+8) & mpoly;
in[15]++;
}
/* Fill ip key */
in[0] = 0xE0;
in[15] = 0;
word64 *l3Key = m_l3Key();
for (i = 0; i <= (size_t)m_is128; i++)
do
{
cipher.ProcessBlock(in, out.BytePtr());
l3Key[i*2+0] = GetWord<word64>(true, BIG_ENDIAN_ORDER, out.BytePtr());
l3Key[i*2+1] = GetWord<word64>(true, BIG_ENDIAN_ORDER, out.BytePtr()+8);
in[15]++;
} while ((l3Key[i*2+0] >= p64) || (l3Key[i*2+1] >= p64));
m_padCached = false;
size_t nonceLength;
const byte *nonce = GetIVAndThrowIfInvalid(params, nonceLength);
Resynchronize(nonce, (int)nonceLength);
}
void VMAC_Base::GetNextIV(RandomNumberGenerator &rng, byte *IV)
{
SimpleKeyingInterface::GetNextIV(rng, IV);
IV[0] &= 0x7f;
}
void VMAC_Base::Resynchronize(const byte *nonce, int len)
{
size_t length = ThrowIfInvalidIVLength(len);
size_t s = IVSize();
byte *storedNonce = m_nonce();
if (m_is128)
{
memset(storedNonce, 0, s-length);
memcpy(storedNonce+s-length, nonce, length);
AccessCipher().ProcessBlock(storedNonce, m_pad());
}
else
{
if (m_padCached && (storedNonce[s-1] | 1) == (nonce[length-1] | 1))
{
m_padCached = VerifyBufsEqual(storedNonce+s-length, nonce, length-1);
for (size_t i=0; m_padCached && i<s-length; i++)
m_padCached = (storedNonce[i] == 0);
}
if (!m_padCached)
{
memset(storedNonce, 0, s-length);
memcpy(storedNonce+s-length, nonce, length-1);
storedNonce[s-1] = nonce[length-1] & 0xfe;
AccessCipher().ProcessBlock(storedNonce, m_pad());
m_padCached = true;
}
storedNonce[s-1] = nonce[length-1];
}
m_isFirstBlock = true;
Restart();
}
void VMAC_Base::HashEndianCorrectedBlock(const word64 *data)
{
assert(false);
throw 0;
}
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE && CRYPTOPP_BOOL_X86
#pragma warning(disable: 4731) // frame pointer register 'ebp' modified by inline assembly code
void
#ifdef __GNUC__
__attribute__ ((noinline)) // Intel Compiler 9.1 workaround
#endif
VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart)
{
const word64 *nhK = m_nhKey();
word64 *polyS = m_polyState();
word32 L1KeyLength = m_L1KeyLength;
#ifdef __GNUC__
word32 temp;
__asm__ __volatile__
(
AS2( mov %%ebx, %0)
AS2( mov %1, %%ebx)
".intel_syntax noprefix;"
#else
#if _MSC_VER < 1300 || defined(__INTEL_COMPILER)
char isFirstBlock = m_isFirstBlock;
AS2( mov ebx, [L1KeyLength])
AS2( mov dl, [isFirstBlock])
#else
AS2( mov ecx, this)
AS2( mov ebx, [ecx+m_L1KeyLength])
AS2( mov dl, [ecx+m_isFirstBlock])
#endif
AS2( mov eax, tagPart)
AS2( shl eax, 4)
AS2( mov edi, nhK)
AS2( add edi, eax)
AS2( add eax, eax)
AS2( add eax, polyS)
AS2( mov esi, data)
AS2( mov ecx, blocksRemainingInWord64)
#endif
AS2( shr ebx, 3)
AS1( push ebp)
AS2( sub esp, 12)
ASL(4)
AS2( mov ebp, ebx)
AS2( cmp ecx, ebx)
AS2( cmovl ebp, ecx)
AS2( sub ecx, ebp)
AS2( lea ebp, [edi+8*ebp]) // end of nhK
AS2( movq mm6, [esi])
AS2( paddq mm6, [edi])
AS2( movq mm5, [esi+8])
AS2( paddq mm5, [edi+8])
AS2( add esi, 16)
AS2( add edi, 16)
AS2( movq mm4, mm6)
ASS( pshufw mm2, mm6, 1, 0, 3, 2)
AS2( pmuludq mm6, mm5)
ASS( pshufw mm3, mm5, 1, 0, 3, 2)
AS2( pmuludq mm5, mm2)
AS2( pmuludq mm2, mm3)
AS2( pmuludq mm3, mm4)
AS2( pxor mm7, mm7)
AS2( movd [esp], mm6)
AS2( psrlq mm6, 32)
AS2( movd [esp+4], mm5)
AS2( psrlq mm5, 32)
AS2( cmp edi, ebp)
ASJ( je, 1, f)
ASL(0)
AS2( movq mm0, [esi])
AS2( paddq mm0, [edi])
AS2( movq mm1, [esi+8])
AS2( paddq mm1, [edi+8])
AS2( add esi, 16)
AS2( add edi, 16)
AS2( movq mm4, mm0)
AS2( paddq mm5, mm2)
ASS( pshufw mm2, mm0, 1, 0, 3, 2)
AS2( pmuludq mm0, mm1)
AS2( movd [esp+8], mm3)
AS2( psrlq mm3, 32)
AS2( paddq mm5, mm3)
ASS( pshufw mm3, mm1, 1, 0, 3, 2)
AS2( pmuludq mm1, mm2)
AS2( pmuludq mm2, mm3)
AS2( pmuludq mm3, mm4)
AS2( movd mm4, [esp])
AS2( paddq mm7, mm4)
AS2( movd mm4, [esp+4])
AS2( paddq mm6, mm4)
AS2( movd mm4, [esp+8])
AS2( paddq mm6, mm4)
AS2( movd [esp], mm0)
AS2( psrlq mm0, 32)
AS2( paddq mm6, mm0)
AS2( movd [esp+4], mm1)
AS2( psrlq mm1, 32)
AS2( paddq mm5, mm1)
AS2( cmp edi, ebp)
ASJ( jne, 0, b)
ASL(1)
AS2( paddq mm5, mm2)
AS2( movd [esp+8], mm3)
AS2( psrlq mm3, 32)
AS2( paddq mm5, mm3)
AS2( movd mm4, [esp])
AS2( paddq mm7, mm4)
AS2( movd mm4, [esp+4])
AS2( paddq mm6, mm4)
AS2( movd mm4, [esp+8])
AS2( paddq mm6, mm4)
AS2( lea ebp, [8*ebx])
AS2( sub edi, ebp) // reset edi to start of nhK
AS2( movd [esp], mm7)
AS2( psrlq mm7, 32)
AS2( paddq mm6, mm7)
AS2( movd [esp+4], mm6)
AS2( psrlq mm6, 32)
AS2( paddq mm5, mm6)
AS2( psllq mm5, 2)
AS2( psrlq mm5, 2)
#define a0 [eax+2*4]
#define a1 [eax+3*4]
#define a2 [eax+0*4]
#define a3 [eax+1*4]
#define k0 [eax+2*8+2*4]
#define k1 [eax+2*8+3*4]
#define k2 [eax+2*8+0*4]
#define k3 [eax+2*8+1*4]
AS2( test dl, dl)
ASJ( jz, 2, f)
AS2( movd mm1, k0)
AS2( movd mm0, [esp])
AS2( paddq mm0, mm1)
AS2( movd a0, mm0)
AS2( psrlq mm0, 32)
AS2( movd mm1, k1)
AS2( movd mm2, [esp+4])
AS2( paddq mm1, mm2)
AS2( paddq mm0, mm1)
AS2( movd a1, mm0)
AS2( psrlq mm0, 32)
AS2( paddq mm5, k2)
AS2( paddq mm0, mm5)
AS2( movq a2, mm0)
AS2( xor edx, edx)
ASJ( jmp, 3, f)
ASL(2)
AS2( movd mm0, a3)
AS2( movq mm4, mm0)
AS2( pmuludq mm0, k3) // a3*k3
AS2( movd mm1, a0)
AS2( pmuludq mm1, k2) // a0*k2
AS2( movd mm2, a1)
AS2( movd mm6, k1)
AS2( pmuludq mm2, mm6) // a1*k1
AS2( movd mm3, a2)
AS2( psllq mm0, 1)
AS2( paddq mm0, mm5)
AS2( movq mm5, mm3)
AS2( movd mm7, k0)
AS2( pmuludq mm3, mm7) // a2*k0
AS2( pmuludq mm4, mm7) // a3*k0
AS2( pmuludq mm5, mm6) // a2*k1
AS2( paddq mm0, mm1)
AS2( movd mm1, a1)
AS2( paddq mm4, mm5)
AS2( movq mm5, mm1)
AS2( pmuludq mm1, k2) // a1*k2
AS2( paddq mm0, mm2)
AS2( movd mm2, a0)
AS2( paddq mm0, mm3)
AS2( movq mm3, mm2)
AS2( pmuludq mm2, k3) // a0*k3
AS2( pmuludq mm3, mm7) // a0*k0
AS2( movd [esp+8], mm0)
AS2( psrlq mm0, 32)
AS2( pmuludq mm7, mm5) // a1*k0
AS2( pmuludq mm5, k3) // a1*k3
AS2( paddq mm0, mm1)
AS2( movd mm1, a2)
AS2( pmuludq mm1, k2) // a2*k2
AS2( paddq mm0, mm2)
AS2( paddq mm0, mm4)
AS2( movq mm4, mm0)
AS2( movd mm2, a3)
AS2( pmuludq mm2, mm6) // a3*k1
AS2( pmuludq mm6, a0) // a0*k1
AS2( psrlq mm0, 31)
AS2( paddq mm0, mm3)
AS2( movd mm3, [esp])
AS2( paddq mm0, mm3)
AS2( movd mm3, a2)
AS2( pmuludq mm3, k3) // a2*k3
AS2( paddq mm5, mm1)
AS2( movd mm1, a3)
AS2( pmuludq mm1, k2) // a3*k2
AS2( paddq mm5, mm2)
AS2( movd mm2, [esp+4])
AS2( psllq mm5, 1)
AS2( paddq mm0, mm5)
AS2( psllq mm4, 33)
AS2( movd a0, mm0)
AS2( psrlq mm0, 32)
AS2( paddq mm6, mm7)
AS2( movd mm7, [esp+8])
AS2( paddq mm0, mm6)
AS2( paddq mm0, mm2)
AS2( paddq mm3, mm1)
AS2( psllq mm3, 1)
AS2( paddq mm0, mm3)
AS2( psrlq mm4, 1)
AS2( movd a1, mm0)
AS2( psrlq mm0, 32)
AS2( por mm4, mm7)
AS2( paddq mm0, mm4)
AS2( movq a2, mm0)
#undef a0
#undef a1
#undef a2
#undef a3
#undef k0
#undef k1
#undef k2
#undef k3
ASL(3)
AS2( test ecx, ecx)
ASJ( jnz, 4, b)
AS2( add esp, 12)
AS1( pop ebp)
AS1( emms)
#ifdef __GNUC__
".att_syntax prefix;"
AS2( mov %0, %%ebx)
: "=m" (temp)
: "m" (L1KeyLength), "c" (blocksRemainingInWord64), "S" (data), "D" (nhK+tagPart*2), "d" (m_isFirstBlock), "a" (polyS+tagPart*4)
: "memory", "cc"
);
#endif
}
#endif
#if VMAC_BOOL_WORD128
#define DeclareNH(a) word128 a=0
#define MUL64(rh,rl,i1,i2) {word128 p = word128(i1)*(i2); rh = word64(p>>64); rl = word64(p);}
#define AccumulateNH(a, b, c) a += word128(b)*(c)
#define Multiply128(r, i1, i2) r = word128(word64(i1)) * word64(i2)
#else
#if _MSC_VER >= 1400 && !defined(__INTEL_COMPILER)
#define MUL32(a, b) __emulu(word32(a), word32(b))
#else
#define MUL32(a, b) ((word64)((word32)(a)) * (word32)(b))
#endif
#if defined(CRYPTOPP_X64_ASM_AVAILABLE)
#define DeclareNH(a) word64 a##0=0, a##1=0
#define MUL64(rh,rl,i1,i2) asm ("mulq %3" : "=a"(rl), "=d"(rh) : "a"(i1), "g"(i2) : "cc");
#define AccumulateNH(a, b, c) asm ("mulq %3; addq %%rax, %0; adcq %%rdx, %1" : "+r"(a##0), "+r"(a##1) : "a"(b), "g"(c) : "%rdx", "cc");
#define ADD128(rh,rl,ih,il) asm ("addq %3, %1; adcq %2, %0" : "+r"(rh),"+r"(rl) : "r"(ih),"r"(il) : "cc");
#elif defined(_MSC_VER) && !CRYPTOPP_BOOL_SLOW_WORD64
#define DeclareNH(a) word64 a##0=0, a##1=0
#define MUL64(rh,rl,i1,i2) (rl) = _umul128(i1,i2,&(rh));
#define AccumulateNH(a, b, c) {\
word64 ph, pl;\
pl = _umul128(b,c,&ph);\
a##0 += pl;\
a##1 += ph + (a##0 < pl);}
#else
#define VMAC_BOOL_32BIT 1
#define DeclareNH(a) word64 a##0=0, a##1=0, a##2=0
#define MUL64(rh,rl,i1,i2) \
{ word64 _i1 = (i1), _i2 = (i2); \
word64 m1= MUL32(_i1,_i2>>32); \
word64 m2= MUL32(_i1>>32,_i2); \
rh = MUL32(_i1>>32,_i2>>32); \
rl = MUL32(_i1,_i2); \
ADD128(rh,rl,(m1 >> 32),(m1 << 32)); \
ADD128(rh,rl,(m2 >> 32),(m2 << 32)); \
}
#define AccumulateNH(a, b, c) {\
word64 p = MUL32(b, c);\
a##1 += word32((p)>>32);\
a##0 += word32(p);\
p = MUL32((b)>>32, c);\
a##2 += word32((p)>>32);\
a##1 += word32(p);\
p = MUL32((b)>>32, (c)>>32);\
a##2 += p;\
p = MUL32(b, (c)>>32);\
a##1 += word32(p);\
a##2 += word32(p>>32);}
#endif
#endif
#ifndef VMAC_BOOL_32BIT
#define VMAC_BOOL_32BIT 0
#endif
#ifndef ADD128
#define ADD128(rh,rl,ih,il) \
{ word64 _il = (il); \
(rl) += (_il); \
(rh) += (ih) + ((rl) < (_il)); \
}
#endif
#if !(defined(_MSC_VER) && _MSC_VER < 1300)
template <bool T_128BitTag>
#endif
void VMAC_Base::VHASH_Update_Template(const word64 *data, size_t blocksRemainingInWord64)
{
#define INNER_LOOP_ITERATION(j) {\
word64 d0 = ConditionalByteReverse(LITTLE_ENDIAN_ORDER, data[i+2*j+0]);\
word64 d1 = ConditionalByteReverse(LITTLE_ENDIAN_ORDER, data[i+2*j+1]);\
AccumulateNH(nhA, d0+nhK[i+2*j+0], d1+nhK[i+2*j+1]);\
if (T_128BitTag)\
AccumulateNH(nhB, d0+nhK[i+2*j+2], d1+nhK[i+2*j+3]);\
}
#if (defined(_MSC_VER) && _MSC_VER < 1300)
bool T_128BitTag = m_is128;
#endif
size_t L1KeyLengthInWord64 = m_L1KeyLength / 8;
size_t innerLoopEnd = L1KeyLengthInWord64;
const word64 *nhK = m_nhKey();
word64 *polyS = m_polyState();
bool isFirstBlock = true;
size_t i;
#if !VMAC_BOOL_32BIT
#if VMAC_BOOL_WORD128
word128 a1, a2;
#else
word64 ah1, al1, ah2, al2;
#endif
word64 kh1, kl1, kh2, kl2;
kh1=(polyS+0*4+2)[0]; kl1=(polyS+0*4+2)[1];
if (T_128BitTag)
{
kh2=(polyS+1*4+2)[0]; kl2=(polyS+1*4+2)[1];
}
#endif
do
{
DeclareNH(nhA);
DeclareNH(nhB);
i = 0;
if (blocksRemainingInWord64 < L1KeyLengthInWord64)
{
if (blocksRemainingInWord64 % 8)
{
innerLoopEnd = blocksRemainingInWord64 % 8;
for (; i<innerLoopEnd; i+=2)
INNER_LOOP_ITERATION(0);
}
innerLoopEnd = blocksRemainingInWord64;
}
for (; i<innerLoopEnd; i+=8)
{
INNER_LOOP_ITERATION(0);
INNER_LOOP_ITERATION(1);
INNER_LOOP_ITERATION(2);
INNER_LOOP_ITERATION(3);
}
blocksRemainingInWord64 -= innerLoopEnd;
data += innerLoopEnd;
#if VMAC_BOOL_32BIT
word32 nh0[2], nh1[2];
word64 nh2[2];
nh0[0] = word32(nhA0);
nhA1 += (nhA0 >> 32);
nh1[0] = word32(nhA1);
nh2[0] = (nhA2 + (nhA1 >> 32)) & m62;
if (T_128BitTag)
{
nh0[1] = word32(nhB0);
nhB1 += (nhB0 >> 32);
nh1[1] = word32(nhB1);
nh2[1] = (nhB2 + (nhB1 >> 32)) & m62;
}
#define a0 (((word32 *)(polyS+i*4))[2+NativeByteOrder::ToEnum()])
#define a1 (*(((word32 *)(polyS+i*4))+3-NativeByteOrder::ToEnum())) // workaround for GCC 3.2
#define a2 (((word32 *)(polyS+i*4))[0+NativeByteOrder::ToEnum()])
#define a3 (*(((word32 *)(polyS+i*4))+1-NativeByteOrder::ToEnum()))
#define aHi ((polyS+i*4)[0])
#define k0 (((word32 *)(polyS+i*4+2))[2+NativeByteOrder::ToEnum()])
#define k1 (*(((word32 *)(polyS+i*4+2))+3-NativeByteOrder::ToEnum()))
#define k2 (((word32 *)(polyS+i*4+2))[0+NativeByteOrder::ToEnum()])
#define k3 (*(((word32 *)(polyS+i*4+2))+1-NativeByteOrder::ToEnum()))
#define kHi ((polyS+i*4+2)[0])
if (isFirstBlock)
{
isFirstBlock = false;
if (m_isFirstBlock)
{
m_isFirstBlock = false;
for (i=0; i<=(size_t)T_128BitTag; i++)
{
word64 t = (word64)nh0[i] + k0;
a0 = (word32)t;
t = (t >> 32) + nh1[i] + k1;
a1 = (word32)t;
aHi = (t >> 32) + nh2[i] + kHi;
}
continue;
}
}
for (i=0; i<=(size_t)T_128BitTag; i++)
{
word64 p, t;
word32 t2;
p = MUL32(a3, 2*k3);
p += nh2[i];
p += MUL32(a0, k2);
p += MUL32(a1, k1);
p += MUL32(a2, k0);
t2 = (word32)p;
p >>= 32;
p += MUL32(a0, k3);
p += MUL32(a1, k2);
p += MUL32(a2, k1);
p += MUL32(a3, k0);
t = (word64(word32(p) & 0x7fffffff) << 32) | t2;
p >>= 31;
p += nh0[i];
p += MUL32(a0, k0);
p += MUL32(a1, 2*k3);
p += MUL32(a2, 2*k2);
p += MUL32(a3, 2*k1);
t2 = (word32)p;
p >>= 32;
p += nh1[i];
p += MUL32(a0, k1);
p += MUL32(a1, k0);
p += MUL32(a2, 2*k3);
p += MUL32(a3, 2*k2);
a0 = t2;
a1 = (word32)p;
aHi = (p >> 32) + t;
}
#undef a0
#undef a1
#undef a2
#undef a3
#undef aHi
#undef k0
#undef k1
#undef k2
#undef k3
#undef kHi
#else // #if VMAC_BOOL_32BIT
if (isFirstBlock)
{
isFirstBlock = false;
if (m_isFirstBlock)
{
m_isFirstBlock = false;
#if VMAC_BOOL_WORD128
#define first_poly_step(a, kh, kl, m) a = (m & m126) + ((word128(kh) << 64) | kl)
first_poly_step(a1, kh1, kl1, nhA);
if (T_128BitTag)
first_poly_step(a2, kh2, kl2, nhB);
#else
#define first_poly_step(ah, al, kh, kl, mh, ml) {\
mh &= m62;\
ADD128(mh, ml, kh, kl); \
ah = mh; al = ml;}
first_poly_step(ah1, al1, kh1, kl1, nhA1, nhA0);
if (T_128BitTag)
first_poly_step(ah2, al2, kh2, kl2, nhB1, nhB0);
#endif
continue;
}
else
{
#if VMAC_BOOL_WORD128
a1 = (word128((polyS+0*4)[0]) << 64) | (polyS+0*4)[1];
#else
ah1=(polyS+0*4)[0]; al1=(polyS+0*4)[1];
#endif
if (T_128BitTag)
{
#if VMAC_BOOL_WORD128
a2 = (word128((polyS+1*4)[0]) << 64) | (polyS+1*4)[1];
#else
ah2=(polyS+1*4)[0]; al2=(polyS+1*4)[1];
#endif
}
}
}
#if VMAC_BOOL_WORD128
#define poly_step(a, kh, kl, m) \
{ word128 t1, t2, t3, t4;\
Multiply128(t2, a>>64, kl);\
Multiply128(t3, a, kh);\
Multiply128(t1, a, kl);\
Multiply128(t4, a>>64, 2*kh);\
t2 += t3;\
t4 += t1;\
t2 += t4>>64;\
a = (word128(word64(t2)&m63) << 64) | word64(t4);\
t2 *= 2;\
a += m & m126;\
a += t2>>64;}
poly_step(a1, kh1, kl1, nhA);
if (T_128BitTag)
poly_step(a2, kh2, kl2, nhB);
#else
#define poly_step(ah, al, kh, kl, mh, ml) \
{ word64 t1h, t1l, t2h, t2l, t3h, t3l, z=0; \
/* compute ab*cd, put bd into result registers */ \
MUL64(t2h,t2l,ah,kl); \
MUL64(t3h,t3l,al,kh); \
MUL64(t1h,t1l,ah,2*kh); \
MUL64(ah,al,al,kl); \
/* add together ad + bc */ \
ADD128(t2h,t2l,t3h,t3l); \
/* add 2 * ac to result */ \
ADD128(ah,al,t1h,t1l); \
/* now (ah,al), (t2l,2*t2h) need summing */ \
/* first add the high registers, carrying into t2h */ \
ADD128(t2h,ah,z,t2l); \
/* double t2h and add top bit of ah */ \
t2h += t2h + (ah >> 63); \
ah &= m63; \
/* now add the low registers */ \
mh &= m62; \
ADD128(ah,al,mh,ml); \
ADD128(ah,al,z,t2h); \
}
poly_step(ah1, al1, kh1, kl1, nhA1, nhA0);
if (T_128BitTag)
poly_step(ah2, al2, kh2, kl2, nhB1, nhB0);
#endif
#endif // #if VMAC_BOOL_32BIT
} while (blocksRemainingInWord64);
#if VMAC_BOOL_WORD128
(polyS+0*4)[0]=word64(a1>>64); (polyS+0*4)[1]=word64(a1);
if (T_128BitTag)
{
(polyS+1*4)[0]=word64(a2>>64); (polyS+1*4)[1]=word64(a2);
}
#elif !VMAC_BOOL_32BIT
(polyS+0*4)[0]=ah1; (polyS+0*4)[1]=al1;
if (T_128BitTag)
{
(polyS+1*4)[0]=ah2; (polyS+1*4)[1]=al2;
}
#endif
}
inline void VMAC_Base::VHASH_Update(const word64 *data, size_t blocksRemainingInWord64)
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE && CRYPTOPP_BOOL_X86
if (HasSSE2())
{
VHASH_Update_SSE2(data, blocksRemainingInWord64, 0);
if (m_is128)
VHASH_Update_SSE2(data, blocksRemainingInWord64, 1);
m_isFirstBlock = false;
}
else
#endif
{
#if defined(_MSC_VER) && _MSC_VER < 1300
VHASH_Update_Template(data, blocksRemainingInWord64);
#else
if (m_is128)
VHASH_Update_Template<true>(data, blocksRemainingInWord64);
else
VHASH_Update_Template<false>(data, blocksRemainingInWord64);
#endif
}
}
size_t VMAC_Base::HashMultipleBlocks(const word64 *data, size_t length)
{
size_t remaining = ModPowerOf2(length, m_L1KeyLength);
VHASH_Update(data, (length-remaining)/8);
return remaining;
}
static word64 L3Hash(const word64 *input, const word64 *l3Key, size_t len)
{
word64 rh, rl, t, z=0;
word64 p1 = input[0], p2 = input[1];
word64 k1 = l3Key[0], k2 = l3Key[1];
/* fully reduce (p1,p2)+(len,0) mod p127 */
t = p1 >> 63;
p1 &= m63;
ADD128(p1, p2, len, t);
/* At this point, (p1,p2) is at most 2^127+(len<<64) */
t = (p1 > m63) + ((p1 == m63) & (p2 == m64));
ADD128(p1, p2, z, t);
p1 &= m63;
/* compute (p1,p2)/(2^64-2^32) and (p1,p2)%(2^64-2^32) */
t = p1 + (p2 >> 32);
t += (t >> 32);
t += (word32)t > 0xfffffffeU;
p1 += (t >> 32);
p2 += (p1 << 32);
/* compute (p1+k1)%p64 and (p2+k2)%p64 */
p1 += k1;
p1 += (0 - (p1 < k1)) & 257;
p2 += k2;
p2 += (0 - (p2 < k2)) & 257;
/* compute (p1+k1)*(p2+k2)%p64 */
MUL64(rh, rl, p1, p2);
t = rh >> 56;
ADD128(t, rl, z, rh);
rh <<= 8;
ADD128(t, rl, z, rh);
t += t << 8;
rl += t;
rl += (0 - (rl < t)) & 257;
rl += (0 - (rl > p64-1)) & 257;
return rl;
}
void VMAC_Base::TruncatedFinal(byte *mac, size_t size)
{
size_t len = ModPowerOf2(GetBitCountLo()/8, m_L1KeyLength);
if (len)
{
memset(m_data()+len, 0, (0-len)%16);
VHASH_Update(DataBuf(), ((len+15)/16)*2);
len *= 8; // convert to bits
}
else if (m_isFirstBlock)
{
// special case for empty string
m_polyState()[0] = m_polyState()[2];
m_polyState()[1] = m_polyState()[3];
if (m_is128)
{
m_polyState()[4] = m_polyState()[6];
m_polyState()[5] = m_polyState()[7];
}
}
if (m_is128)
{
word64 t[2];
t[0] = L3Hash(m_polyState(), m_l3Key(), len) + GetWord<word64>(true, BIG_ENDIAN_ORDER, m_pad());
t[1] = L3Hash(m_polyState()+4, m_l3Key()+2, len) + GetWord<word64>(true, BIG_ENDIAN_ORDER, m_pad()+8);
if (size == 16)
{
PutWord(false, BIG_ENDIAN_ORDER, mac, t[0]);
PutWord(false, BIG_ENDIAN_ORDER, mac+8, t[1]);
}
else
{
t[0] = ConditionalByteReverse(BIG_ENDIAN_ORDER, t[0]);
t[1] = ConditionalByteReverse(BIG_ENDIAN_ORDER, t[1]);
memcpy(mac, t, size);
}
}
else
{
word64 t = L3Hash(m_polyState(), m_l3Key(), len);
t += GetWord<word64>(true, BIG_ENDIAN_ORDER, m_pad() + (m_nonce()[IVSize()-1]&1) * 8);
if (size == 8)
PutWord(false, BIG_ENDIAN_ORDER, mac, t);
else
{
t = ConditionalByteReverse(BIG_ENDIAN_ORDER, t);
memcpy(mac, &t, size);
}
}
}
NAMESPACE_END
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