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// salsa.cpp - written and placed in the public domain by Wei Dai
// use "cl /EP /P /DCRYPTOPP_GENERATE_X64_MASM salsa.cpp" to generate MASM code
#include "pch.h"
#ifndef CRYPTOPP_GENERATE_X64_MASM
#include "salsa.h"
#include "misc.h"
#include "argnames.h"
#include "cpu.h"
NAMESPACE_BEGIN(CryptoPP)
void Salsa20_TestInstantiations()
{
Salsa20::Encryption x;
}
void Salsa20_Policy::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
{
m_rounds = params.GetIntValueWithDefault(Name::Rounds(), 20);
if (!(m_rounds == 8 || m_rounds == 12 || m_rounds == 20))
throw InvalidRounds(Salsa20::StaticAlgorithmName(), m_rounds);
// m_state is reordered for SSE2
GetBlock<word32, LittleEndian> get1(key);
get1(m_state[13])(m_state[10])(m_state[7])(m_state[4]);
GetBlock<word32, LittleEndian> get2(key + length - 16);
get2(m_state[15])(m_state[12])(m_state[9])(m_state[6]);
// "expand 16-byte k" or "expand 32-byte k"
m_state[0] = 0x61707865;
m_state[1] = (length == 16) ? 0x3120646e : 0x3320646e;
m_state[2] = (length == 16) ? 0x79622d36 : 0x79622d32;
m_state[3] = 0x6b206574;
}
void Salsa20_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
{
assert(length==8);
GetBlock<word32, LittleEndian> get(IV);
get(m_state[14])(m_state[11]);
m_state[8] = m_state[5] = 0;
}
void Salsa20_Policy::SeekToIteration(lword iterationCount)
{
m_state[8] = (word32)iterationCount;
m_state[5] = (word32)SafeRightShift<32>(iterationCount);
}
#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X64
unsigned int Salsa20_Policy::GetAlignment() const
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
if (HasSSE2())
return 16;
else
#endif
return GetAlignmentOf<word32>();
}
unsigned int Salsa20_Policy::GetOptimalBlockSize() const
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
if (HasSSE2())
return 4*BYTES_PER_ITERATION;
else
#endif
return BYTES_PER_ITERATION;
}
#endif
#ifdef CRYPTOPP_X64_MASM_AVAILABLE
extern "C" {
void Salsa20_OperateKeystream(byte *output, const byte *input, size_t iterationCount, int rounds, void *state);
}
#endif
#pragma warning(disable: 4731) // frame pointer register 'ebp' modified by inline assembly code
void Salsa20_Policy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
{
#endif // #ifdef CRYPTOPP_GENERATE_X64_MASM
#ifdef CRYPTOPP_X64_MASM_AVAILABLE
Salsa20_OperateKeystream(output, input, iterationCount, m_rounds, m_state.data());
return;
#endif
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
#ifdef CRYPTOPP_GENERATE_X64_MASM
ALIGN 8
Salsa20_OperateKeystream PROC FRAME
mov r10, [rsp + 5*8] ; state
alloc_stack(10*16 + 32*16 + 8)
save_xmm128 xmm6, 0200h
save_xmm128 xmm7, 0210h
save_xmm128 xmm8, 0220h
save_xmm128 xmm9, 0230h
save_xmm128 xmm10, 0240h
save_xmm128 xmm11, 0250h
save_xmm128 xmm12, 0260h
save_xmm128 xmm13, 0270h
save_xmm128 xmm14, 0280h
save_xmm128 xmm15, 0290h
.endprolog
#define REG_output rcx
#define REG_input rdx
#define REG_iterationCount r8
#define REG_state r10
#define REG_rounds e9d
#define REG_roundsLeft eax
#define REG_temp32 r11d
#define REG_temp r11
#define SSE2_WORKSPACE rsp
#else
if (HasSSE2())
{
#if CRYPTOPP_BOOL_X64
#define REG_output %1
#define REG_input %0
#define REG_iterationCount %2
#define REG_state %4 /* constant */
#define REG_rounds %3 /* constant */
#define REG_roundsLeft eax
#define REG_temp32 edx
#define REG_temp rdx
#define SSE2_WORKSPACE %5 /* constant */
CRYPTOPP_ALIGN_DATA(16) byte workspace[16*32];
#else
#define REG_output edi
#define REG_input eax
#define REG_iterationCount ecx
#define REG_state esi
#define REG_rounds edx
#define REG_roundsLeft ebx
#define REG_temp32 ebp
#define REG_temp ebp
#define SSE2_WORKSPACE esp + WORD_SZ
#endif
#ifdef __GNUC__
__asm__ __volatile__
(
".intel_syntax noprefix;"
AS_PUSH_IF86( bx)
#else
void *s = m_state.data();
word32 r = m_rounds;
AS2( mov REG_iterationCount, iterationCount)
AS2( mov REG_input, input)
AS2( mov REG_output, output)
AS2( mov REG_state, s)
AS2( mov REG_rounds, r)
#endif
#endif // #ifndef CRYPTOPP_GENERATE_X64_MASM
AS_PUSH_IF86( bp)
AS2( cmp REG_iterationCount, 4)
ASJ( jl, 5, f)
#if CRYPTOPP_BOOL_X86
AS2( mov ebx, esp)
AS2( and esp, -16)
AS2( sub esp, 32*16)
AS1( push ebx)
#endif
#define SSE2_EXPAND_S(i, j) \
ASS( pshufd xmm4, xmm##i, j, j, j, j) \
AS2( movdqa [SSE2_WORKSPACE + (i*4+j)*16 + 256], xmm4)
AS2( movdqa xmm0, [REG_state + 0*16])
AS2( movdqa xmm1, [REG_state + 1*16])
AS2( movdqa xmm2, [REG_state + 2*16])
AS2( movdqa xmm3, [REG_state + 3*16])
SSE2_EXPAND_S(0, 0)
SSE2_EXPAND_S(0, 1)
SSE2_EXPAND_S(0, 2)
SSE2_EXPAND_S(0, 3)
SSE2_EXPAND_S(1, 0)
SSE2_EXPAND_S(1, 2)
SSE2_EXPAND_S(1, 3)
SSE2_EXPAND_S(2, 1)
SSE2_EXPAND_S(2, 2)
SSE2_EXPAND_S(2, 3)
SSE2_EXPAND_S(3, 0)
SSE2_EXPAND_S(3, 1)
SSE2_EXPAND_S(3, 2)
SSE2_EXPAND_S(3, 3)
#define SSE2_EXPAND_S85(i) \
AS2( mov dword ptr [SSE2_WORKSPACE + 8*16 + i*4 + 256], REG_roundsLeft) \
AS2( mov dword ptr [SSE2_WORKSPACE + 5*16 + i*4 + 256], REG_temp32) \
AS2( add REG_roundsLeft, 1) \
AS2( adc REG_temp32, 0)
ASL(1)
AS2( mov REG_roundsLeft, dword ptr [REG_state + 8*4])
AS2( mov REG_temp32, dword ptr [REG_state + 5*4])
SSE2_EXPAND_S85(0)
SSE2_EXPAND_S85(1)
SSE2_EXPAND_S85(2)
SSE2_EXPAND_S85(3)
AS2( mov dword ptr [REG_state + 8*4], REG_roundsLeft)
AS2( mov dword ptr [REG_state + 5*4], REG_temp32)
#define SSE2_QUARTER_ROUND(a, b, d, i) \
AS2( movdqa xmm4, xmm##d) \
AS2( paddd xmm4, xmm##a) \
AS2( movdqa xmm5, xmm4) \
AS2( pslld xmm4, i) \
AS2( psrld xmm5, 32-i) \
AS2( pxor xmm##b, xmm4) \
AS2( pxor xmm##b, xmm5)
#define L01(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##A, [SSE2_WORKSPACE + d*16 + i*256]) /* y3 */
#define L02(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##C, [SSE2_WORKSPACE + a*16 + i*256]) /* y0 */
#define L03(A,B,C,D,a,b,c,d,i) AS2( paddd xmm##A, xmm##C) /* y0+y3 */
#define L04(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##B, xmm##A)
#define L05(A,B,C,D,a,b,c,d,i) AS2( pslld xmm##A, 7)
#define L06(A,B,C,D,a,b,c,d,i) AS2( psrld xmm##B, 32-7)
#define L07(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, [SSE2_WORKSPACE + b*16 + i*256])
#define L08(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, xmm##B) /* z1 */
#define L09(A,B,C,D,a,b,c,d,i) AS2( movdqa [SSE2_WORKSPACE + b*16], xmm##A)
#define L10(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##B, xmm##A)
#define L11(A,B,C,D,a,b,c,d,i) AS2( paddd xmm##A, xmm##C) /* z1+y0 */
#define L12(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##D, xmm##A)
#define L13(A,B,C,D,a,b,c,d,i) AS2( pslld xmm##A, 9)
#define L14(A,B,C,D,a,b,c,d,i) AS2( psrld xmm##D, 32-9)
#define L15(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, [SSE2_WORKSPACE + c*16 + i*256])
#define L16(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, xmm##D) /* z2 */
#define L17(A,B,C,D,a,b,c,d,i) AS2( movdqa [SSE2_WORKSPACE + c*16], xmm##A)
#define L18(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##D, xmm##A)
#define L19(A,B,C,D,a,b,c,d,i) AS2( paddd xmm##A, xmm##B) /* z2+z1 */
#define L20(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##B, xmm##A)
#define L21(A,B,C,D,a,b,c,d,i) AS2( pslld xmm##A, 13)
#define L22(A,B,C,D,a,b,c,d,i) AS2( psrld xmm##B, 32-13)
#define L23(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, [SSE2_WORKSPACE + d*16 + i*256])
#define L24(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, xmm##B) /* z3 */
#define L25(A,B,C,D,a,b,c,d,i) AS2( movdqa [SSE2_WORKSPACE + d*16], xmm##A)
#define L26(A,B,C,D,a,b,c,d,i) AS2( paddd xmm##A, xmm##D) /* z3+z2 */
#define L27(A,B,C,D,a,b,c,d,i) AS2( movdqa xmm##D, xmm##A)
#define L28(A,B,C,D,a,b,c,d,i) AS2( pslld xmm##A, 18)
#define L29(A,B,C,D,a,b,c,d,i) AS2( psrld xmm##D, 32-18)
#define L30(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, xmm##C) /* xor y0 */
#define L31(A,B,C,D,a,b,c,d,i) AS2( pxor xmm##A, xmm##D) /* z0 */
#define L32(A,B,C,D,a,b,c,d,i) AS2( movdqa [SSE2_WORKSPACE + a*16], xmm##A)
#define SSE2_QUARTER_ROUND_X8(i, a, b, c, d, e, f, g, h) \
L01(0,1,2,3, a,b,c,d, i) L01(4,5,6,7, e,f,g,h, i) \
L02(0,1,2,3, a,b,c,d, i) L02(4,5,6,7, e,f,g,h, i) \
L03(0,1,2,3, a,b,c,d, i) L03(4,5,6,7, e,f,g,h, i) \
L04(0,1,2,3, a,b,c,d, i) L04(4,5,6,7, e,f,g,h, i) \
L05(0,1,2,3, a,b,c,d, i) L05(4,5,6,7, e,f,g,h, i) \
L06(0,1,2,3, a,b,c,d, i) L06(4,5,6,7, e,f,g,h, i) \
L07(0,1,2,3, a,b,c,d, i) L07(4,5,6,7, e,f,g,h, i) \
L08(0,1,2,3, a,b,c,d, i) L08(4,5,6,7, e,f,g,h, i) \
L09(0,1,2,3, a,b,c,d, i) L09(4,5,6,7, e,f,g,h, i) \
L10(0,1,2,3, a,b,c,d, i) L10(4,5,6,7, e,f,g,h, i) \
L11(0,1,2,3, a,b,c,d, i) L11(4,5,6,7, e,f,g,h, i) \
L12(0,1,2,3, a,b,c,d, i) L12(4,5,6,7, e,f,g,h, i) \
L13(0,1,2,3, a,b,c,d, i) L13(4,5,6,7, e,f,g,h, i) \
L14(0,1,2,3, a,b,c,d, i) L14(4,5,6,7, e,f,g,h, i) \
L15(0,1,2,3, a,b,c,d, i) L15(4,5,6,7, e,f,g,h, i) \
L16(0,1,2,3, a,b,c,d, i) L16(4,5,6,7, e,f,g,h, i) \
L17(0,1,2,3, a,b,c,d, i) L17(4,5,6,7, e,f,g,h, i) \
L18(0,1,2,3, a,b,c,d, i) L18(4,5,6,7, e,f,g,h, i) \
L19(0,1,2,3, a,b,c,d, i) L19(4,5,6,7, e,f,g,h, i) \
L20(0,1,2,3, a,b,c,d, i) L20(4,5,6,7, e,f,g,h, i) \
L21(0,1,2,3, a,b,c,d, i) L21(4,5,6,7, e,f,g,h, i) \
L22(0,1,2,3, a,b,c,d, i) L22(4,5,6,7, e,f,g,h, i) \
L23(0,1,2,3, a,b,c,d, i) L23(4,5,6,7, e,f,g,h, i) \
L24(0,1,2,3, a,b,c,d, i) L24(4,5,6,7, e,f,g,h, i) \
L25(0,1,2,3, a,b,c,d, i) L25(4,5,6,7, e,f,g,h, i) \
L26(0,1,2,3, a,b,c,d, i) L26(4,5,6,7, e,f,g,h, i) \
L27(0,1,2,3, a,b,c,d, i) L27(4,5,6,7, e,f,g,h, i) \
L28(0,1,2,3, a,b,c,d, i) L28(4,5,6,7, e,f,g,h, i) \
L29(0,1,2,3, a,b,c,d, i) L29(4,5,6,7, e,f,g,h, i) \
L30(0,1,2,3, a,b,c,d, i) L30(4,5,6,7, e,f,g,h, i) \
L31(0,1,2,3, a,b,c,d, i) L31(4,5,6,7, e,f,g,h, i) \
L32(0,1,2,3, a,b,c,d, i) L32(4,5,6,7, e,f,g,h, i)
#define SSE2_QUARTER_ROUND_X16(i, a, b, c, d, e, f, g, h, A, B, C, D, E, F, G, H) \
L01(0,1,2,3, a,b,c,d, i) L01(4,5,6,7, e,f,g,h, i) L01(8,9,10,11, A,B,C,D, i) L01(12,13,14,15, E,F,G,H, i) \
L02(0,1,2,3, a,b,c,d, i) L02(4,5,6,7, e,f,g,h, i) L02(8,9,10,11, A,B,C,D, i) L02(12,13,14,15, E,F,G,H, i) \
L03(0,1,2,3, a,b,c,d, i) L03(4,5,6,7, e,f,g,h, i) L03(8,9,10,11, A,B,C,D, i) L03(12,13,14,15, E,F,G,H, i) \
L04(0,1,2,3, a,b,c,d, i) L04(4,5,6,7, e,f,g,h, i) L04(8,9,10,11, A,B,C,D, i) L04(12,13,14,15, E,F,G,H, i) \
L05(0,1,2,3, a,b,c,d, i) L05(4,5,6,7, e,f,g,h, i) L05(8,9,10,11, A,B,C,D, i) L05(12,13,14,15, E,F,G,H, i) \
L06(0,1,2,3, a,b,c,d, i) L06(4,5,6,7, e,f,g,h, i) L06(8,9,10,11, A,B,C,D, i) L06(12,13,14,15, E,F,G,H, i) \
L07(0,1,2,3, a,b,c,d, i) L07(4,5,6,7, e,f,g,h, i) L07(8,9,10,11, A,B,C,D, i) L07(12,13,14,15, E,F,G,H, i) \
L08(0,1,2,3, a,b,c,d, i) L08(4,5,6,7, e,f,g,h, i) L08(8,9,10,11, A,B,C,D, i) L08(12,13,14,15, E,F,G,H, i) \
L09(0,1,2,3, a,b,c,d, i) L09(4,5,6,7, e,f,g,h, i) L09(8,9,10,11, A,B,C,D, i) L09(12,13,14,15, E,F,G,H, i) \
L10(0,1,2,3, a,b,c,d, i) L10(4,5,6,7, e,f,g,h, i) L10(8,9,10,11, A,B,C,D, i) L10(12,13,14,15, E,F,G,H, i) \
L11(0,1,2,3, a,b,c,d, i) L11(4,5,6,7, e,f,g,h, i) L11(8,9,10,11, A,B,C,D, i) L11(12,13,14,15, E,F,G,H, i) \
L12(0,1,2,3, a,b,c,d, i) L12(4,5,6,7, e,f,g,h, i) L12(8,9,10,11, A,B,C,D, i) L12(12,13,14,15, E,F,G,H, i) \
L13(0,1,2,3, a,b,c,d, i) L13(4,5,6,7, e,f,g,h, i) L13(8,9,10,11, A,B,C,D, i) L13(12,13,14,15, E,F,G,H, i) \
L14(0,1,2,3, a,b,c,d, i) L14(4,5,6,7, e,f,g,h, i) L14(8,9,10,11, A,B,C,D, i) L14(12,13,14,15, E,F,G,H, i) \
L15(0,1,2,3, a,b,c,d, i) L15(4,5,6,7, e,f,g,h, i) L15(8,9,10,11, A,B,C,D, i) L15(12,13,14,15, E,F,G,H, i) \
L16(0,1,2,3, a,b,c,d, i) L16(4,5,6,7, e,f,g,h, i) L16(8,9,10,11, A,B,C,D, i) L16(12,13,14,15, E,F,G,H, i) \
L17(0,1,2,3, a,b,c,d, i) L17(4,5,6,7, e,f,g,h, i) L17(8,9,10,11, A,B,C,D, i) L17(12,13,14,15, E,F,G,H, i) \
L18(0,1,2,3, a,b,c,d, i) L18(4,5,6,7, e,f,g,h, i) L18(8,9,10,11, A,B,C,D, i) L18(12,13,14,15, E,F,G,H, i) \
L19(0,1,2,3, a,b,c,d, i) L19(4,5,6,7, e,f,g,h, i) L19(8,9,10,11, A,B,C,D, i) L19(12,13,14,15, E,F,G,H, i) \
L20(0,1,2,3, a,b,c,d, i) L20(4,5,6,7, e,f,g,h, i) L20(8,9,10,11, A,B,C,D, i) L20(12,13,14,15, E,F,G,H, i) \
L21(0,1,2,3, a,b,c,d, i) L21(4,5,6,7, e,f,g,h, i) L21(8,9,10,11, A,B,C,D, i) L21(12,13,14,15, E,F,G,H, i) \
L22(0,1,2,3, a,b,c,d, i) L22(4,5,6,7, e,f,g,h, i) L22(8,9,10,11, A,B,C,D, i) L22(12,13,14,15, E,F,G,H, i) \
L23(0,1,2,3, a,b,c,d, i) L23(4,5,6,7, e,f,g,h, i) L23(8,9,10,11, A,B,C,D, i) L23(12,13,14,15, E,F,G,H, i) \
L24(0,1,2,3, a,b,c,d, i) L24(4,5,6,7, e,f,g,h, i) L24(8,9,10,11, A,B,C,D, i) L24(12,13,14,15, E,F,G,H, i) \
L25(0,1,2,3, a,b,c,d, i) L25(4,5,6,7, e,f,g,h, i) L25(8,9,10,11, A,B,C,D, i) L25(12,13,14,15, E,F,G,H, i) \
L26(0,1,2,3, a,b,c,d, i) L26(4,5,6,7, e,f,g,h, i) L26(8,9,10,11, A,B,C,D, i) L26(12,13,14,15, E,F,G,H, i) \
L27(0,1,2,3, a,b,c,d, i) L27(4,5,6,7, e,f,g,h, i) L27(8,9,10,11, A,B,C,D, i) L27(12,13,14,15, E,F,G,H, i) \
L28(0,1,2,3, a,b,c,d, i) L28(4,5,6,7, e,f,g,h, i) L28(8,9,10,11, A,B,C,D, i) L28(12,13,14,15, E,F,G,H, i) \
L29(0,1,2,3, a,b,c,d, i) L29(4,5,6,7, e,f,g,h, i) L29(8,9,10,11, A,B,C,D, i) L29(12,13,14,15, E,F,G,H, i) \
L30(0,1,2,3, a,b,c,d, i) L30(4,5,6,7, e,f,g,h, i) L30(8,9,10,11, A,B,C,D, i) L30(12,13,14,15, E,F,G,H, i) \
L31(0,1,2,3, a,b,c,d, i) L31(4,5,6,7, e,f,g,h, i) L31(8,9,10,11, A,B,C,D, i) L31(12,13,14,15, E,F,G,H, i) \
L32(0,1,2,3, a,b,c,d, i) L32(4,5,6,7, e,f,g,h, i) L32(8,9,10,11, A,B,C,D, i) L32(12,13,14,15, E,F,G,H, i)
#if CRYPTOPP_BOOL_X64
SSE2_QUARTER_ROUND_X16(1, 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15)
#else
SSE2_QUARTER_ROUND_X8(1, 2, 6, 10, 14, 3, 7, 11, 15)
SSE2_QUARTER_ROUND_X8(1, 0, 4, 8, 12, 1, 5, 9, 13)
#endif
AS2( mov REG_roundsLeft, REG_rounds)
ASJ( jmp, 2, f)
ASL(SSE2_Salsa_Output)
AS2( movdqa xmm0, xmm4)
AS2( punpckldq xmm4, xmm5)
AS2( movdqa xmm1, xmm6)
AS2( punpckldq xmm6, xmm7)
AS2( movdqa xmm2, xmm4)
AS2( punpcklqdq xmm4, xmm6) // e
AS2( punpckhqdq xmm2, xmm6) // f
AS2( punpckhdq xmm0, xmm5)
AS2( punpckhdq xmm1, xmm7)
AS2( movdqa xmm6, xmm0)
AS2( punpcklqdq xmm0, xmm1) // g
AS2( punpckhqdq xmm6, xmm1) // h
AS_XMM_OUTPUT4(SSE2_Salsa_Output_A, REG_input, REG_output, 4, 2, 0, 6, 1, 0, 4, 8, 12, 1)
AS1( ret)
ASL(6)
#if CRYPTOPP_BOOL_X64
SSE2_QUARTER_ROUND_X16(0, 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15)
ASL(2)
SSE2_QUARTER_ROUND_X16(0, 0, 13, 10, 7, 1, 14, 11, 4, 2, 15, 8, 5, 3, 12, 9, 6)
#else
SSE2_QUARTER_ROUND_X8(0, 2, 6, 10, 14, 3, 7, 11, 15)
SSE2_QUARTER_ROUND_X8(0, 0, 4, 8, 12, 1, 5, 9, 13)
ASL(2)
SSE2_QUARTER_ROUND_X8(0, 2, 15, 8, 5, 3, 12, 9, 6)
SSE2_QUARTER_ROUND_X8(0, 0, 13, 10, 7, 1, 14, 11, 4)
#endif
AS2( sub REG_roundsLeft, 2)
ASJ( jnz, 6, b)
#define SSE2_OUTPUT_4(a, b, c, d) \
AS2( movdqa xmm4, [SSE2_WORKSPACE + a*16 + 256])\
AS2( paddd xmm4, [SSE2_WORKSPACE + a*16])\
AS2( movdqa xmm5, [SSE2_WORKSPACE + b*16 + 256])\
AS2( paddd xmm5, [SSE2_WORKSPACE + b*16])\
AS2( movdqa xmm6, [SSE2_WORKSPACE + c*16 + 256])\
AS2( paddd xmm6, [SSE2_WORKSPACE + c*16])\
AS2( movdqa xmm7, [SSE2_WORKSPACE + d*16 + 256])\
AS2( paddd xmm7, [SSE2_WORKSPACE + d*16])\
ASC( call, SSE2_Salsa_Output)
SSE2_OUTPUT_4(0, 13, 10, 7)
SSE2_OUTPUT_4(4, 1, 14, 11)
SSE2_OUTPUT_4(8, 5, 2, 15)
SSE2_OUTPUT_4(12, 9, 6, 3)
AS2( test REG_input, REG_input)
ASJ( jz, 9, f)
AS2( add REG_input, 12*16)
ASL(9)
AS2( add REG_output, 12*16)
AS2( sub REG_iterationCount, 4)
AS2( cmp REG_iterationCount, 4)
ASJ( jge, 1, b)
AS_POP_IF86( sp)
ASL(5)
AS2( sub REG_iterationCount, 1)
ASJ( jl, 4, f)
AS2( movdqa xmm0, [REG_state + 0*16])
AS2( movdqa xmm1, [REG_state + 1*16])
AS2( movdqa xmm2, [REG_state + 2*16])
AS2( movdqa xmm3, [REG_state + 3*16])
AS2( mov REG_roundsLeft, REG_rounds)
ASL(0)
SSE2_QUARTER_ROUND(0, 1, 3, 7)
SSE2_QUARTER_ROUND(1, 2, 0, 9)
SSE2_QUARTER_ROUND(2, 3, 1, 13)
SSE2_QUARTER_ROUND(3, 0, 2, 18)
ASS( pshufd xmm1, xmm1, 2, 1, 0, 3)
ASS( pshufd xmm2, xmm2, 1, 0, 3, 2)
ASS( pshufd xmm3, xmm3, 0, 3, 2, 1)
SSE2_QUARTER_ROUND(0, 3, 1, 7)
SSE2_QUARTER_ROUND(3, 2, 0, 9)
SSE2_QUARTER_ROUND(2, 1, 3, 13)
SSE2_QUARTER_ROUND(1, 0, 2, 18)
ASS( pshufd xmm1, xmm1, 0, 3, 2, 1)
ASS( pshufd xmm2, xmm2, 1, 0, 3, 2)
ASS( pshufd xmm3, xmm3, 2, 1, 0, 3)
AS2( sub REG_roundsLeft, 2)
ASJ( jnz, 0, b)
AS2( paddd xmm0, [REG_state + 0*16])
AS2( paddd xmm1, [REG_state + 1*16])
AS2( paddd xmm2, [REG_state + 2*16])
AS2( paddd xmm3, [REG_state + 3*16])
AS2( add dword ptr [REG_state + 8*4], 1)
AS2( adc dword ptr [REG_state + 5*4], 0)
AS2( pcmpeqb xmm6, xmm6) // all ones
AS2( psrlq xmm6, 32) // lo32 mask
ASS( pshufd xmm7, xmm6, 0, 1, 2, 3) // hi32 mask
AS2( movdqa xmm4, xmm0)
AS2( movdqa xmm5, xmm3)
AS2( pand xmm0, xmm7)
AS2( pand xmm4, xmm6)
AS2( pand xmm3, xmm6)
AS2( pand xmm5, xmm7)
AS2( por xmm4, xmm5) // 0,13,2,15
AS2( movdqa xmm5, xmm1)
AS2( pand xmm1, xmm7)
AS2( pand xmm5, xmm6)
AS2( por xmm0, xmm5) // 4,1,6,3
AS2( pand xmm6, xmm2)
AS2( pand xmm2, xmm7)
AS2( por xmm1, xmm6) // 8,5,10,7
AS2( por xmm2, xmm3) // 12,9,14,11
AS2( movdqa xmm5, xmm4)
AS2( movdqa xmm6, xmm0)
AS3( shufpd xmm4, xmm1, 2) // 0,13,10,7
AS3( shufpd xmm0, xmm2, 2) // 4,1,14,11
AS3( shufpd xmm1, xmm5, 2) // 8,5,2,15
AS3( shufpd xmm2, xmm6, 2) // 12,9,6,3
// output keystream
AS_XMM_OUTPUT4(SSE2_Salsa_Output_B, REG_input, REG_output, 4, 0, 1, 2, 3, 0, 1, 2, 3, 4)
ASJ( jmp, 5, b)
ASL(4)
AS_POP_IF86( bp)
#ifdef __GNUC__
AS_POP_IF86( bx)
".att_syntax prefix;"
#if CRYPTOPP_BOOL_X64
: "+r" (input), "+r" (output), "+r" (iterationCount)
: "r" (m_rounds), "r" (m_state.m_ptr), "r" (workspace)
: "%eax", "%rdx", "memory", "cc", "%xmm0", "%xmm1", "%xmm2", "%xmm3", "%xmm4", "%xmm5", "%xmm6", "%xmm7", "%xmm8", "%xmm9", "%xmm10", "%xmm11", "%xmm12", "%xmm13", "%xmm14", "%xmm15"
#else
: "+a" (input), "+D" (output), "+c" (iterationCount)
: "d" (m_rounds), "S" (m_state.m_ptr)
: "memory", "cc"
#endif
);
#endif
#ifdef CRYPTOPP_GENERATE_X64_MASM
movdqa xmm6, [rsp + 0200h]
movdqa xmm7, [rsp + 0210h]
movdqa xmm8, [rsp + 0220h]
movdqa xmm9, [rsp + 0230h]
movdqa xmm10, [rsp + 0240h]
movdqa xmm11, [rsp + 0250h]
movdqa xmm12, [rsp + 0260h]
movdqa xmm13, [rsp + 0270h]
movdqa xmm14, [rsp + 0280h]
movdqa xmm15, [rsp + 0290h]
add rsp, 10*16 + 32*16 + 8
ret
Salsa20_OperateKeystream ENDP
#else
}
else
#endif
#endif
#ifndef CRYPTOPP_GENERATE_X64_MASM
{
word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
while (iterationCount--)
{
x0 = m_state[0]; x1 = m_state[1]; x2 = m_state[2]; x3 = m_state[3];
x4 = m_state[4]; x5 = m_state[5]; x6 = m_state[6]; x7 = m_state[7];
x8 = m_state[8]; x9 = m_state[9]; x10 = m_state[10]; x11 = m_state[11];
x12 = m_state[12]; x13 = m_state[13]; x14 = m_state[14]; x15 = m_state[15];
for (int i=m_rounds; i>0; i-=2)
{
#define QUARTER_ROUND(a, b, c, d) \
b = b ^ rotlFixed(a + d, 7); \
c = c ^ rotlFixed(b + a, 9); \
d = d ^ rotlFixed(c + b, 13); \
a = a ^ rotlFixed(d + c, 18);
QUARTER_ROUND(x0, x4, x8, x12)
QUARTER_ROUND(x1, x5, x9, x13)
QUARTER_ROUND(x2, x6, x10, x14)
QUARTER_ROUND(x3, x7, x11, x15)
QUARTER_ROUND(x0, x13, x10, x7)
QUARTER_ROUND(x1, x14, x11, x4)
QUARTER_ROUND(x2, x15, x8, x5)
QUARTER_ROUND(x3, x12, x9, x6)
}
#define SALSA_OUTPUT(x) {\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, x0 + m_state[0]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, x13 + m_state[13]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 2, x10 + m_state[10]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 3, x7 + m_state[7]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 4, x4 + m_state[4]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 5, x1 + m_state[1]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 6, x14 + m_state[14]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 7, x11 + m_state[11]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 8, x8 + m_state[8]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 9, x5 + m_state[5]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 10, x2 + m_state[2]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 11, x15 + m_state[15]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 12, x12 + m_state[12]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 13, x9 + m_state[9]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 14, x6 + m_state[6]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 15, x3 + m_state[3]);}
#ifndef CRYPTOPP_DOXYGEN_PROCESSING
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(SALSA_OUTPUT, BYTES_PER_ITERATION);
#endif
if (++m_state[8] == 0)
++m_state[5];
}
}
} // see comment above if an internal compiler error occurs here
void XSalsa20_Policy::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
{
m_rounds = params.GetIntValueWithDefault(Name::Rounds(), 20);
if (!(m_rounds == 8 || m_rounds == 12 || m_rounds == 20))
throw InvalidRounds(XSalsa20::StaticAlgorithmName(), m_rounds);
GetUserKey(LITTLE_ENDIAN_ORDER, m_key.begin(), m_key.size(), key, length);
if (length == 16)
memcpy(m_key.begin()+4, m_key.begin(), 16);
// "expand 32-byte k"
m_state[0] = 0x61707865;
m_state[1] = 0x3320646e;
m_state[2] = 0x79622d32;
m_state[3] = 0x6b206574;
}
void XSalsa20_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
{
assert(length==24);
word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
GetBlock<word32, LittleEndian> get(IV);
get(x14)(x11)(x8)(x5)(m_state[14])(m_state[11]);
x13 = m_key[0]; x10 = m_key[1]; x7 = m_key[2]; x4 = m_key[3];
x15 = m_key[4]; x12 = m_key[5]; x9 = m_key[6]; x6 = m_key[7];
x0 = m_state[0]; x1 = m_state[1]; x2 = m_state[2]; x3 = m_state[3];
for (int i=m_rounds; i>0; i-=2)
{
QUARTER_ROUND(x0, x4, x8, x12)
QUARTER_ROUND(x1, x5, x9, x13)
QUARTER_ROUND(x2, x6, x10, x14)
QUARTER_ROUND(x3, x7, x11, x15)
QUARTER_ROUND(x0, x13, x10, x7)
QUARTER_ROUND(x1, x14, x11, x4)
QUARTER_ROUND(x2, x15, x8, x5)
QUARTER_ROUND(x3, x12, x9, x6)
}
m_state[13] = x0; m_state[10] = x1; m_state[7] = x2; m_state[4] = x3;
m_state[15] = x14; m_state[12] = x11; m_state[9] = x8; m_state[6] = x5;
m_state[8] = m_state[5] = 0;
}
NAMESPACE_END
#endif // #ifndef CRYPTOPP_GENERATE_X64_MASM
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