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chacha20poly1305_amd64.s
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chacha20poly1305_amd64.s
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build go1.7
#include "textflag.h"
// General register allocation
#define oup DI
#define inp SI
#define inl BX
#define adp CX // free to reuse, after we hash the additional data
#define keyp R8 // free to reuse, when we copy the key to stack
#define itr2 R9 // general iterator
#define itr1 CX // general iterator
#define acc0 R10
#define acc1 R11
#define acc2 R12
#define t0 R13
#define t1 R14
#define t2 R15
#define t3 R8
// Register and stack allocation for the SSE code
#define rStore (0*16)(BP)
#define sStore (1*16)(BP)
#define state1Store (2*16)(BP)
#define state2Store (3*16)(BP)
#define tmpStore (4*16)(BP)
#define ctr0Store (5*16)(BP)
#define ctr1Store (6*16)(BP)
#define ctr2Store (7*16)(BP)
#define ctr3Store (8*16)(BP)
#define A0 X0
#define A1 X1
#define A2 X2
#define B0 X3
#define B1 X4
#define B2 X5
#define C0 X6
#define C1 X7
#define C2 X8
#define D0 X9
#define D1 X10
#define D2 X11
#define T0 X12
#define T1 X13
#define T2 X14
#define T3 X15
#define A3 T0
#define B3 T1
#define C3 T2
#define D3 T3
// Register and stack allocation for the AVX2 code
#define rsStoreAVX2 (0*32)(BP)
#define state1StoreAVX2 (1*32)(BP)
#define state2StoreAVX2 (2*32)(BP)
#define ctr0StoreAVX2 (3*32)(BP)
#define ctr1StoreAVX2 (4*32)(BP)
#define ctr2StoreAVX2 (5*32)(BP)
#define ctr3StoreAVX2 (6*32)(BP)
#define tmpStoreAVX2 (7*32)(BP) // 256 bytes on stack
#define AA0 Y0
#define AA1 Y5
#define AA2 Y6
#define AA3 Y7
#define BB0 Y14
#define BB1 Y9
#define BB2 Y10
#define BB3 Y11
#define CC0 Y12
#define CC1 Y13
#define CC2 Y8
#define CC3 Y15
#define DD0 Y4
#define DD1 Y1
#define DD2 Y2
#define DD3 Y3
#define TT0 DD3
#define TT1 AA3
#define TT2 BB3
#define TT3 CC3
// ChaCha20 constants
DATA chacha20Constants<>+0x00(SB)/4, $0x61707865
DATA chacha20Constants<>+0x04(SB)/4, $0x3320646e
DATA chacha20Constants<>+0x08(SB)/4, $0x79622d32
DATA chacha20Constants<>+0x0c(SB)/4, $0x6b206574
DATA chacha20Constants<>+0x10(SB)/4, $0x61707865
DATA chacha20Constants<>+0x14(SB)/4, $0x3320646e
DATA chacha20Constants<>+0x18(SB)/4, $0x79622d32
DATA chacha20Constants<>+0x1c(SB)/4, $0x6b206574
// <<< 16 with PSHUFB
DATA rol16<>+0x00(SB)/8, $0x0504070601000302
DATA rol16<>+0x08(SB)/8, $0x0D0C0F0E09080B0A
DATA rol16<>+0x10(SB)/8, $0x0504070601000302
DATA rol16<>+0x18(SB)/8, $0x0D0C0F0E09080B0A
// <<< 8 with PSHUFB
DATA rol8<>+0x00(SB)/8, $0x0605040702010003
DATA rol8<>+0x08(SB)/8, $0x0E0D0C0F0A09080B
DATA rol8<>+0x10(SB)/8, $0x0605040702010003
DATA rol8<>+0x18(SB)/8, $0x0E0D0C0F0A09080B
DATA avx2InitMask<>+0x00(SB)/8, $0x0
DATA avx2InitMask<>+0x08(SB)/8, $0x0
DATA avx2InitMask<>+0x10(SB)/8, $0x1
DATA avx2InitMask<>+0x18(SB)/8, $0x0
DATA avx2IncMask<>+0x00(SB)/8, $0x2
DATA avx2IncMask<>+0x08(SB)/8, $0x0
DATA avx2IncMask<>+0x10(SB)/8, $0x2
DATA avx2IncMask<>+0x18(SB)/8, $0x0
// Poly1305 key clamp
DATA polyClampMask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
DATA polyClampMask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
DATA polyClampMask<>+0x10(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA polyClampMask<>+0x18(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA sseIncMask<>+0x00(SB)/8, $0x1
DATA sseIncMask<>+0x08(SB)/8, $0x0
// To load/store the last < 16 bytes in a buffer
DATA andMask<>+0x00(SB)/8, $0x00000000000000ff
DATA andMask<>+0x08(SB)/8, $0x0000000000000000
DATA andMask<>+0x10(SB)/8, $0x000000000000ffff
DATA andMask<>+0x18(SB)/8, $0x0000000000000000
DATA andMask<>+0x20(SB)/8, $0x0000000000ffffff
DATA andMask<>+0x28(SB)/8, $0x0000000000000000
DATA andMask<>+0x30(SB)/8, $0x00000000ffffffff
DATA andMask<>+0x38(SB)/8, $0x0000000000000000
DATA andMask<>+0x40(SB)/8, $0x000000ffffffffff
DATA andMask<>+0x48(SB)/8, $0x0000000000000000
DATA andMask<>+0x50(SB)/8, $0x0000ffffffffffff
DATA andMask<>+0x58(SB)/8, $0x0000000000000000
DATA andMask<>+0x60(SB)/8, $0x00ffffffffffffff
DATA andMask<>+0x68(SB)/8, $0x0000000000000000
DATA andMask<>+0x70(SB)/8, $0xffffffffffffffff
DATA andMask<>+0x78(SB)/8, $0x0000000000000000
DATA andMask<>+0x80(SB)/8, $0xffffffffffffffff
DATA andMask<>+0x88(SB)/8, $0x00000000000000ff
DATA andMask<>+0x90(SB)/8, $0xffffffffffffffff
DATA andMask<>+0x98(SB)/8, $0x000000000000ffff
DATA andMask<>+0xa0(SB)/8, $0xffffffffffffffff
DATA andMask<>+0xa8(SB)/8, $0x0000000000ffffff
DATA andMask<>+0xb0(SB)/8, $0xffffffffffffffff
DATA andMask<>+0xb8(SB)/8, $0x00000000ffffffff
DATA andMask<>+0xc0(SB)/8, $0xffffffffffffffff
DATA andMask<>+0xc8(SB)/8, $0x000000ffffffffff
DATA andMask<>+0xd0(SB)/8, $0xffffffffffffffff
DATA andMask<>+0xd8(SB)/8, $0x0000ffffffffffff
DATA andMask<>+0xe0(SB)/8, $0xffffffffffffffff
DATA andMask<>+0xe8(SB)/8, $0x00ffffffffffffff
GLOBL chacha20Constants<>(SB), (NOPTR+RODATA), $32
GLOBL rol16<>(SB), (NOPTR+RODATA), $32
GLOBL rol8<>(SB), (NOPTR+RODATA), $32
GLOBL sseIncMask<>(SB), (NOPTR+RODATA), $16
GLOBL avx2IncMask<>(SB), (NOPTR+RODATA), $32
GLOBL avx2InitMask<>(SB), (NOPTR+RODATA), $32
GLOBL polyClampMask<>(SB), (NOPTR+RODATA), $32
GLOBL andMask<>(SB), (NOPTR+RODATA), $240
// No PALIGNR in Go ASM yet (but VPALIGNR is present).
#define shiftB0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X3, X3
#define shiftB1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x04 // PALIGNR $4, X4, X4
#define shiftB2Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X5, X5
#define shiftB3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X13, X13
#define shiftC0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X6, X6
#define shiftC1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x08 // PALIGNR $8, X7, X7
#define shiftC2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc0; BYTE $0x08 // PALIGNR $8, X8, X8
#define shiftC3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X14, X14
#define shiftD0Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x0c // PALIGNR $12, X9, X9
#define shiftD1Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x0c // PALIGNR $12, X10, X10
#define shiftD2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X11, X11
#define shiftD3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x0c // PALIGNR $12, X15, X15
#define shiftB0Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X3, X3
#define shiftB1Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x0c // PALIGNR $12, X4, X4
#define shiftB2Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X5, X5
#define shiftB3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X13, X13
#define shiftC0Right shiftC0Left
#define shiftC1Right shiftC1Left
#define shiftC2Right shiftC2Left
#define shiftC3Right shiftC3Left
#define shiftD0Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x04 // PALIGNR $4, X9, X9
#define shiftD1Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x04 // PALIGNR $4, X10, X10
#define shiftD2Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X11, X11
#define shiftD3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x04 // PALIGNR $4, X15, X15
// Some macros
#define chachaQR(A, B, C, D, T) \
PADDD B, A; PXOR A, D; PSHUFB rol16<>(SB), D \
PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $12, T; PSRLL $20, B; PXOR T, B \
PADDD B, A; PXOR A, D; PSHUFB rol8<>(SB), D \
PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $7, T; PSRLL $25, B; PXOR T, B
#define chachaQR_AVX2(A, B, C, D, T) \
VPADDD B, A, A; VPXOR A, D, D; VPSHUFB rol16<>(SB), D, D \
VPADDD D, C, C; VPXOR C, B, B; VPSLLD $12, B, T; VPSRLD $20, B, B; VPXOR T, B, B \
VPADDD B, A, A; VPXOR A, D, D; VPSHUFB rol8<>(SB), D, D \
VPADDD D, C, C; VPXOR C, B, B; VPSLLD $7, B, T; VPSRLD $25, B, B; VPXOR T, B, B
#define polyAdd(S) ADDQ S, acc0; ADCQ 8+S, acc1; ADCQ $1, acc2
#define polyMulStage1 MOVQ (0*8)(BP), AX; MOVQ AX, t2; MULQ acc0; MOVQ AX, t0; MOVQ DX, t1; MOVQ (0*8)(BP), AX; MULQ acc1; IMULQ acc2, t2; ADDQ AX, t1; ADCQ DX, t2
#define polyMulStage2 MOVQ (1*8)(BP), AX; MOVQ AX, t3; MULQ acc0; ADDQ AX, t1; ADCQ $0, DX; MOVQ DX, acc0; MOVQ (1*8)(BP), AX; MULQ acc1; ADDQ AX, t2; ADCQ $0, DX
#define polyMulStage3 IMULQ acc2, t3; ADDQ acc0, t2; ADCQ DX, t3
#define polyMulReduceStage MOVQ t0, acc0; MOVQ t1, acc1; MOVQ t2, acc2; ANDQ $3, acc2; MOVQ t2, t0; ANDQ $-4, t0; MOVQ t3, t1; SHRQ $2, t2:t3; SHRQ $2, t3; ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $0, acc2; ADDQ t2, acc0; ADCQ t3, acc1; ADCQ $0, acc2
#define polyMulStage1_AVX2 MOVQ (0*8)(BP), DX; MOVQ DX, t2; MULXQ acc0, t0, t1; IMULQ acc2, t2; MULXQ acc1, AX, DX; ADDQ AX, t1; ADCQ DX, t2
#define polyMulStage2_AVX2 MOVQ (1*8)(BP), DX; MULXQ acc0, acc0, AX; ADDQ acc0, t1; MULXQ acc1, acc1, t3; ADCQ acc1, t2; ADCQ $0, t3
#define polyMulStage3_AVX2 IMULQ acc2, DX; ADDQ AX, t2; ADCQ DX, t3
#define polyMul polyMulStage1; polyMulStage2; polyMulStage3; polyMulReduceStage
#define polyMulAVX2 polyMulStage1_AVX2; polyMulStage2_AVX2; polyMulStage3_AVX2; polyMulReduceStage
// ----------------------------------------------------------------------------
TEXT polyHashADInternal(SB), NOSPLIT, $0
// adp points to beginning of additional data
// itr2 holds ad length
XORQ acc0, acc0
XORQ acc1, acc1
XORQ acc2, acc2
CMPQ itr2, $13
JNE hashADLoop
openFastTLSAD:
// Special treatment for the TLS case of 13 bytes
MOVQ (adp), acc0
MOVQ 5(adp), acc1
SHRQ $24, acc1
MOVQ $1, acc2
polyMul
RET
hashADLoop:
// Hash in 16 byte chunks
CMPQ itr2, $16
JB hashADTail
polyAdd(0(adp))
LEAQ (1*16)(adp), adp
SUBQ $16, itr2
polyMul
JMP hashADLoop
hashADTail:
CMPQ itr2, $0
JE hashADDone
// Hash last < 16 byte tail
XORQ t0, t0
XORQ t1, t1
XORQ t2, t2
ADDQ itr2, adp
hashADTailLoop:
SHLQ $8, t1:t0
SHLQ $8, t0
MOVB -1(adp), t2
XORQ t2, t0
DECQ adp
DECQ itr2
JNE hashADTailLoop
hashADTailFinish:
ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
polyMul
// Finished AD
hashADDone:
RET
// ----------------------------------------------------------------------------
// func chacha20Poly1305Open(dst, key, src, ad []byte) bool
TEXT ·chacha20Poly1305Open(SB), 0, $288-97
// For aligned stack access
MOVQ SP, BP
ADDQ $32, BP
ANDQ $-32, BP
MOVQ dst+0(FP), oup
MOVQ key+24(FP), keyp
MOVQ src+48(FP), inp
MOVQ src_len+56(FP), inl
MOVQ ad+72(FP), adp
// Check for AVX2 support
CMPB runtime·support_avx2(SB), $1
JE chacha20Poly1305Open_AVX2
// Special optimization, for very short buffers
CMPQ inl, $128
JBE openSSE128 // About 16% faster
// For long buffers, prepare the poly key first
MOVOU chacha20Constants<>(SB), A0
MOVOU (1*16)(keyp), B0
MOVOU (2*16)(keyp), C0
MOVOU (3*16)(keyp), D0
MOVO D0, T1
// Store state on stack for future use
MOVO B0, state1Store
MOVO C0, state2Store
MOVO D0, ctr3Store
MOVQ $10, itr2
openSSEPreparePolyKey:
chachaQR(A0, B0, C0, D0, T0)
shiftB0Left; shiftC0Left; shiftD0Left
chachaQR(A0, B0, C0, D0, T0)
shiftB0Right; shiftC0Right; shiftD0Right
DECQ itr2
JNE openSSEPreparePolyKey
// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
PADDL chacha20Constants<>(SB), A0; PADDL state1Store, B0
// Clamp and store the key
PAND polyClampMask<>(SB), A0
MOVO A0, rStore; MOVO B0, sStore
// Hash AAD
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal(SB)
openSSEMainLoop:
CMPQ inl, $256
JB openSSEMainLoopDone
// Load state, increment counter blocks
MOVO chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL sseIncMask<>(SB), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL sseIncMask<>(SB), D2
MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL sseIncMask<>(SB), D3
// Store counters
MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
// There are 10 ChaCha20 iterations of 2QR each, so for 6 iterations we hash 2 blocks, and for the remaining 4 only 1 block - for a total of 16
MOVQ $4, itr1
MOVQ inp, itr2
openSSEInternalLoop:
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyAdd(0(itr2))
shiftB0Left; shiftB1Left; shiftB2Left; shiftB3Left
shiftC0Left; shiftC1Left; shiftC2Left; shiftC3Left
shiftD0Left; shiftD1Left; shiftD2Left; shiftD3Left
polyMulStage1
polyMulStage2
LEAQ (2*8)(itr2), itr2
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
polyMulStage3
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyMulReduceStage
shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
DECQ itr1
JGE openSSEInternalLoop
polyAdd(0(itr2))
polyMul
LEAQ (2*8)(itr2), itr2
CMPQ itr1, $-6
JG openSSEInternalLoop
// Add in the state
PADDD chacha20Constants<>(SB), A0; PADDD chacha20Constants<>(SB), A1; PADDD chacha20Constants<>(SB), A2; PADDD chacha20Constants<>(SB), A3
PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
// Load - xor - store
MOVO D3, tmpStore
MOVOU (0*16)(inp), D3; PXOR D3, A0; MOVOU A0, (0*16)(oup)
MOVOU (1*16)(inp), D3; PXOR D3, B0; MOVOU B0, (1*16)(oup)
MOVOU (2*16)(inp), D3; PXOR D3, C0; MOVOU C0, (2*16)(oup)
MOVOU (3*16)(inp), D3; PXOR D3, D0; MOVOU D0, (3*16)(oup)
MOVOU (4*16)(inp), D0; PXOR D0, A1; MOVOU A1, (4*16)(oup)
MOVOU (5*16)(inp), D0; PXOR D0, B1; MOVOU B1, (5*16)(oup)
MOVOU (6*16)(inp), D0; PXOR D0, C1; MOVOU C1, (6*16)(oup)
MOVOU (7*16)(inp), D0; PXOR D0, D1; MOVOU D1, (7*16)(oup)
MOVOU (8*16)(inp), D0; PXOR D0, A2; MOVOU A2, (8*16)(oup)
MOVOU (9*16)(inp), D0; PXOR D0, B2; MOVOU B2, (9*16)(oup)
MOVOU (10*16)(inp), D0; PXOR D0, C2; MOVOU C2, (10*16)(oup)
MOVOU (11*16)(inp), D0; PXOR D0, D2; MOVOU D2, (11*16)(oup)
MOVOU (12*16)(inp), D0; PXOR D0, A3; MOVOU A3, (12*16)(oup)
MOVOU (13*16)(inp), D0; PXOR D0, B3; MOVOU B3, (13*16)(oup)
MOVOU (14*16)(inp), D0; PXOR D0, C3; MOVOU C3, (14*16)(oup)
MOVOU (15*16)(inp), D0; PXOR tmpStore, D0; MOVOU D0, (15*16)(oup)
LEAQ 256(inp), inp
LEAQ 256(oup), oup
SUBQ $256, inl
JMP openSSEMainLoop
openSSEMainLoopDone:
// Handle the various tail sizes efficiently
TESTQ inl, inl
JE openSSEFinalize
CMPQ inl, $64
JBE openSSETail64
CMPQ inl, $128
JBE openSSETail128
CMPQ inl, $192
JBE openSSETail192
JMP openSSETail256
openSSEFinalize:
// Hash in the PT, AAD lengths
ADDQ ad_len+80(FP), acc0; ADCQ src_len+56(FP), acc1; ADCQ $1, acc2
polyMul
// Final reduce
MOVQ acc0, t0
MOVQ acc1, t1
MOVQ acc2, t2
SUBQ $-5, acc0
SBBQ $-1, acc1
SBBQ $3, acc2
CMOVQCS t0, acc0
CMOVQCS t1, acc1
CMOVQCS t2, acc2
// Add in the "s" part of the key
ADDQ 0+sStore, acc0
ADCQ 8+sStore, acc1
// Finally, constant time compare to the tag at the end of the message
XORQ AX, AX
MOVQ $1, DX
XORQ (0*8)(inp), acc0
XORQ (1*8)(inp), acc1
ORQ acc1, acc0
CMOVQEQ DX, AX
// Return true iff tags are equal
MOVB AX, ret+96(FP)
RET
// ----------------------------------------------------------------------------
// Special optimization for buffers smaller than 129 bytes
openSSE128:
// For up to 128 bytes of ciphertext and 64 bytes for the poly key, we require to process three blocks
MOVOU chacha20Constants<>(SB), A0; MOVOU (1*16)(keyp), B0; MOVOU (2*16)(keyp), C0; MOVOU (3*16)(keyp), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL sseIncMask<>(SB), D2
MOVO B0, T1; MOVO C0, T2; MOVO D1, T3
MOVQ $10, itr2
openSSE128InnerCipherLoop:
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Left; shiftB1Left; shiftB2Left
shiftC0Left; shiftC1Left; shiftC2Left
shiftD0Left; shiftD1Left; shiftD2Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Right; shiftB1Right; shiftB2Right
shiftC0Right; shiftC1Right; shiftC2Right
shiftD0Right; shiftD1Right; shiftD2Right
DECQ itr2
JNE openSSE128InnerCipherLoop
// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
PADDL chacha20Constants<>(SB), A0; PADDL chacha20Constants<>(SB), A1; PADDL chacha20Constants<>(SB), A2
PADDL T1, B0; PADDL T1, B1; PADDL T1, B2
PADDL T2, C1; PADDL T2, C2
PADDL T3, D1; PADDL sseIncMask<>(SB), T3; PADDL T3, D2
// Clamp and store the key
PAND polyClampMask<>(SB), A0
MOVOU A0, rStore; MOVOU B0, sStore
// Hash
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal(SB)
openSSE128Open:
CMPQ inl, $16
JB openSSETail16
SUBQ $16, inl
// Load for hashing
polyAdd(0(inp))
// Load for decryption
MOVOU (inp), T0; PXOR T0, A1; MOVOU A1, (oup)
LEAQ (1*16)(inp), inp
LEAQ (1*16)(oup), oup
polyMul
// Shift the stream "left"
MOVO B1, A1
MOVO C1, B1
MOVO D1, C1
MOVO A2, D1
MOVO B2, A2
MOVO C2, B2
MOVO D2, C2
JMP openSSE128Open
openSSETail16:
TESTQ inl, inl
JE openSSEFinalize
// We can safely load the CT from the end, because it is padded with the MAC
MOVQ inl, itr2
SHLQ $4, itr2
LEAQ andMask<>(SB), t0
MOVOU (inp), T0
ADDQ inl, inp
PAND -16(t0)(itr2*1), T0
MOVQ T0, t0
PEXTRQ $1, T0, t1
PXOR A1, T0
// We can only store one byte at a time, since plaintext can be shorter than 16 bytes
openSSETail16Store:
PEXTRB $0, T0, (oup)
PSRLDQ $1, T0
INCQ oup
DECQ inl
JNE openSSETail16Store
ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
polyMul
JMP openSSEFinalize
// ----------------------------------------------------------------------------
// Special optimization for the last 64 bytes of ciphertext
openSSETail64:
// Need to decrypt up to 64 bytes - prepare single block
MOVO chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL sseIncMask<>(SB), D0; MOVO D0, ctr0Store
XORQ itr2, itr2
MOVQ inl, itr1
CMPQ itr1, $16
JB openSSETail64LoopB
openSSETail64LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
SUBQ $16, itr1
openSSETail64LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0)
shiftB0Left; shiftC0Left; shiftD0Left
chachaQR(A0, B0, C0, D0, T0)
shiftB0Right; shiftC0Right; shiftD0Right
CMPQ itr1, $16
JAE openSSETail64LoopA
CMPQ itr2, $160
JNE openSSETail64LoopB
PADDL chacha20Constants<>(SB), A0; PADDL state1Store, B0; PADDL state2Store, C0; PADDL ctr0Store, D0
openSSETail64DecLoop:
CMPQ inl, $16
JB openSSETail64DecLoopDone
SUBQ $16, inl
MOVOU (inp), T0
PXOR T0, A0
MOVOU A0, (oup)
LEAQ 16(inp), inp
LEAQ 16(oup), oup
MOVO B0, A0
MOVO C0, B0
MOVO D0, C0
JMP openSSETail64DecLoop
openSSETail64DecLoopDone:
MOVO A0, A1
JMP openSSETail16
// ----------------------------------------------------------------------------
// Special optimization for the last 128 bytes of ciphertext
openSSETail128:
// Need to decrypt up to 128 bytes - prepare two blocks
MOVO chacha20Constants<>(SB), A1; MOVO state1Store, B1; MOVO state2Store, C1; MOVO ctr3Store, D1; PADDL sseIncMask<>(SB), D1; MOVO D1, ctr0Store
MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL sseIncMask<>(SB), D0; MOVO D0, ctr1Store
XORQ itr2, itr2
MOVQ inl, itr1
ANDQ $-16, itr1
openSSETail128LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
openSSETail128LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
shiftB0Left; shiftC0Left; shiftD0Left
shiftB1Left; shiftC1Left; shiftD1Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
shiftB0Right; shiftC0Right; shiftD0Right
shiftB1Right; shiftC1Right; shiftD1Right
CMPQ itr2, itr1
JB openSSETail128LoopA
CMPQ itr2, $160
JNE openSSETail128LoopB
PADDL chacha20Constants<>(SB), A0; PADDL chacha20Constants<>(SB), A1
PADDL state1Store, B0; PADDL state1Store, B1
PADDL state2Store, C0; PADDL state2Store, C1
PADDL ctr1Store, D0; PADDL ctr0Store, D1
MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
PXOR T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
MOVOU A1, (0*16)(oup); MOVOU B1, (1*16)(oup); MOVOU C1, (2*16)(oup); MOVOU D1, (3*16)(oup)
SUBQ $64, inl
LEAQ 64(inp), inp
LEAQ 64(oup), oup
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// Special optimization for the last 192 bytes of ciphertext
openSSETail192:
// Need to decrypt up to 192 bytes - prepare three blocks
MOVO chacha20Constants<>(SB), A2; MOVO state1Store, B2; MOVO state2Store, C2; MOVO ctr3Store, D2; PADDL sseIncMask<>(SB), D2; MOVO D2, ctr0Store
MOVO A2, A1; MOVO B2, B1; MOVO C2, C1; MOVO D2, D1; PADDL sseIncMask<>(SB), D1; MOVO D1, ctr1Store
MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL sseIncMask<>(SB), D0; MOVO D0, ctr2Store
MOVQ inl, itr1
MOVQ $160, itr2
CMPQ itr1, $160
CMOVQGT itr2, itr1
ANDQ $-16, itr1
XORQ itr2, itr2
openSSLTail192LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
openSSLTail192LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Left; shiftC0Left; shiftD0Left
shiftB1Left; shiftC1Left; shiftD1Left
shiftB2Left; shiftC2Left; shiftD2Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Right; shiftC0Right; shiftD0Right
shiftB1Right; shiftC1Right; shiftD1Right
shiftB2Right; shiftC2Right; shiftD2Right
CMPQ itr2, itr1
JB openSSLTail192LoopA
CMPQ itr2, $160
JNE openSSLTail192LoopB
CMPQ inl, $176
JB openSSLTail192Store
polyAdd(160(inp))
polyMul
CMPQ inl, $192
JB openSSLTail192Store
polyAdd(176(inp))
polyMul
openSSLTail192Store:
PADDL chacha20Constants<>(SB), A0; PADDL chacha20Constants<>(SB), A1; PADDL chacha20Constants<>(SB), A2
PADDL state1Store, B0; PADDL state1Store, B1; PADDL state1Store, B2
PADDL state2Store, C0; PADDL state2Store, C1; PADDL state2Store, C2
PADDL ctr2Store, D0; PADDL ctr1Store, D1; PADDL ctr0Store, D2
MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
PXOR T0, A2; PXOR T1, B2; PXOR T2, C2; PXOR T3, D2
MOVOU A2, (0*16)(oup); MOVOU B2, (1*16)(oup); MOVOU C2, (2*16)(oup); MOVOU D2, (3*16)(oup)
MOVOU (4*16)(inp), T0; MOVOU (5*16)(inp), T1; MOVOU (6*16)(inp), T2; MOVOU (7*16)(inp), T3
PXOR T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
SUBQ $128, inl
LEAQ 128(inp), inp
LEAQ 128(oup), oup
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// Special optimization for the last 256 bytes of ciphertext
openSSETail256:
// Need to decrypt up to 256 bytes - prepare four blocks
MOVO chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL sseIncMask<>(SB), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL sseIncMask<>(SB), D2
MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL sseIncMask<>(SB), D3
// Store counters
MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
XORQ itr2, itr2
openSSETail256Loop:
// This loop inteleaves 8 ChaCha quarter rounds with 1 poly multiplication
polyAdd(0(inp)(itr2*1))
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
shiftB0Left; shiftB1Left; shiftB2Left; shiftB3Left
shiftC0Left; shiftC1Left; shiftC2Left; shiftC3Left
shiftD0Left; shiftD1Left; shiftD2Left; shiftD3Left
polyMulStage1
polyMulStage2
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyMulStage3
polyMulReduceStage
shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
ADDQ $2*8, itr2
CMPQ itr2, $160
JB openSSETail256Loop
MOVQ inl, itr1
ANDQ $-16, itr1
openSSETail256HashLoop:
polyAdd(0(inp)(itr2*1))
polyMul
ADDQ $2*8, itr2
CMPQ itr2, itr1
JB openSSETail256HashLoop
// Add in the state
PADDD chacha20Constants<>(SB), A0; PADDD chacha20Constants<>(SB), A1; PADDD chacha20Constants<>(SB), A2; PADDD chacha20Constants<>(SB), A3
PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
MOVO D3, tmpStore
// Load - xor - store
MOVOU (0*16)(inp), D3; PXOR D3, A0
MOVOU (1*16)(inp), D3; PXOR D3, B0
MOVOU (2*16)(inp), D3; PXOR D3, C0
MOVOU (3*16)(inp), D3; PXOR D3, D0
MOVOU A0, (0*16)(oup)
MOVOU B0, (1*16)(oup)
MOVOU C0, (2*16)(oup)
MOVOU D0, (3*16)(oup)
MOVOU (4*16)(inp), A0; MOVOU (5*16)(inp), B0; MOVOU (6*16)(inp), C0; MOVOU (7*16)(inp), D0
PXOR A0, A1; PXOR B0, B1; PXOR C0, C1; PXOR D0, D1
MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
MOVOU (8*16)(inp), A0; MOVOU (9*16)(inp), B0; MOVOU (10*16)(inp), C0; MOVOU (11*16)(inp), D0
PXOR A0, A2; PXOR B0, B2; PXOR C0, C2; PXOR D0, D2
MOVOU A2, (8*16)(oup); MOVOU B2, (9*16)(oup); MOVOU C2, (10*16)(oup); MOVOU D2, (11*16)(oup)
LEAQ 192(inp), inp
LEAQ 192(oup), oup
SUBQ $192, inl
MOVO A3, A0
MOVO B3, B0
MOVO C3, C0
MOVO tmpStore, D0
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// ------------------------- AVX2 Code ----------------------------------------
chacha20Poly1305Open_AVX2:
VZEROUPPER
VMOVDQU chacha20Constants<>(SB), AA0
BYTE $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x70; BYTE $0x10 // broadcasti128 16(r8), ymm14
BYTE $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x20 // broadcasti128 32(r8), ymm12
BYTE $0xc4; BYTE $0xc2; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x30 // broadcasti128 48(r8), ymm4
VPADDD avx2InitMask<>(SB), DD0, DD0
// Special optimization, for very short buffers
CMPQ inl, $192
JBE openAVX2192
CMPQ inl, $320
JBE openAVX2320
// For the general key prepare the key first - as a byproduct we have 64 bytes of cipher stream
VMOVDQA BB0, state1StoreAVX2
VMOVDQA CC0, state2StoreAVX2
VMOVDQA DD0, ctr3StoreAVX2
MOVQ $10, itr2
openAVX2PreparePolyKey:
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $12, DD0, DD0, DD0
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $4, DD0, DD0, DD0
DECQ itr2
JNE openAVX2PreparePolyKey
VPADDD chacha20Constants<>(SB), AA0, AA0
VPADDD state1StoreAVX2, BB0, BB0
VPADDD state2StoreAVX2, CC0, CC0
VPADDD ctr3StoreAVX2, DD0, DD0
VPERM2I128 $0x02, AA0, BB0, TT0
// Clamp and store poly key
VPAND polyClampMask<>(SB), TT0, TT0
VMOVDQA TT0, rsStoreAVX2
// Stream for the first 64 bytes
VPERM2I128 $0x13, AA0, BB0, AA0
VPERM2I128 $0x13, CC0, DD0, BB0
// Hash AD + first 64 bytes
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal(SB)
XORQ itr1, itr1
openAVX2InitialHash64:
polyAdd(0(inp)(itr1*1))
polyMulAVX2
ADDQ $16, itr1
CMPQ itr1, $64
JNE openAVX2InitialHash64
// Decrypt the first 64 bytes
VPXOR (0*32)(inp), AA0, AA0
VPXOR (1*32)(inp), BB0, BB0
VMOVDQU AA0, (0*32)(oup)
VMOVDQU BB0, (1*32)(oup)
LEAQ (2*32)(inp), inp
LEAQ (2*32)(oup), oup
SUBQ $64, inl
openAVX2MainLoop:
CMPQ inl, $512
JB openAVX2MainLoopDone
// Load state, increment counter blocks, store the incremented counters
VMOVDQU chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
VMOVDQA ctr3StoreAVX2, DD0; VPADDD avx2IncMask<>(SB), DD0, DD0; VPADDD avx2IncMask<>(SB), DD0, DD1; VPADDD avx2IncMask<>(SB), DD1, DD2; VPADDD avx2IncMask<>(SB), DD2, DD3
VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
XORQ itr1, itr1
openAVX2InternalLoop:
// Lets just say this spaghetti loop interleaves 2 quarter rounds with 3 poly multiplications
// Effectively per 512 bytes of stream we hash 480 bytes of ciphertext
polyAdd(0*8(inp)(itr1*1))
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
polyMulStage1_AVX2
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB rol16<>(SB), DD0, DD0; VPSHUFB rol16<>(SB), DD1, DD1; VPSHUFB rol16<>(SB), DD2, DD2; VPSHUFB rol16<>(SB), DD3, DD3
polyMulStage2_AVX2
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
polyMulStage3_AVX2
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulReduceStage
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB rol8<>(SB), DD0, DD0; VPSHUFB rol8<>(SB), DD1, DD1; VPSHUFB rol8<>(SB), DD2, DD2; VPSHUFB rol8<>(SB), DD3, DD3
polyAdd(2*8(inp)(itr1*1))
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
polyMulStage1_AVX2
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulStage2_AVX2
VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
polyMulStage3_AVX2
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB rol16<>(SB), DD0, DD0; VPSHUFB rol16<>(SB), DD1, DD1; VPSHUFB rol16<>(SB), DD2, DD2; VPSHUFB rol16<>(SB), DD3, DD3
polyMulReduceStage
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
polyAdd(4*8(inp)(itr1*1))
LEAQ (6*8)(itr1), itr1
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulStage1_AVX2
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
polyMulStage2_AVX2
VPSHUFB rol8<>(SB), DD0, DD0; VPSHUFB rol8<>(SB), DD1, DD1; VPSHUFB rol8<>(SB), DD2, DD2; VPSHUFB rol8<>(SB), DD3, DD3
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
polyMulStage3_AVX2
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulReduceStage
VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
CMPQ itr1, $480
JNE openAVX2InternalLoop
VPADDD chacha20Constants<>(SB), AA0, AA0; VPADDD chacha20Constants<>(SB), AA1, AA1; VPADDD chacha20Constants<>(SB), AA2, AA2; VPADDD chacha20Constants<>(SB), AA3, AA3
VPADDD state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
VPADDD state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
VPADDD ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
VMOVDQA CC3, tmpStoreAVX2
// We only hashed 480 of the 512 bytes available - hash the remaining 32 here
polyAdd(480(inp))
polyMulAVX2
VPERM2I128 $0x02, AA0, BB0, CC3; VPERM2I128 $0x13, AA0, BB0, BB0; VPERM2I128 $0x02, CC0, DD0, AA0; VPERM2I128 $0x13, CC0, DD0, CC0
VPXOR (0*32)(inp), CC3, CC3; VPXOR (1*32)(inp), AA0, AA0; VPXOR (2*32)(inp), BB0, BB0; VPXOR (3*32)(inp), CC0, CC0
VMOVDQU CC3, (0*32)(oup); VMOVDQU AA0, (1*32)(oup); VMOVDQU BB0, (2*32)(oup); VMOVDQU CC0, (3*32)(oup)
VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
VPXOR (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
VMOVDQU AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
// and here
polyAdd(496(inp))
polyMulAVX2
VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
VPXOR (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
VMOVDQU AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
VPXOR (12*32)(inp), AA0, AA0; VPXOR (13*32)(inp), BB0, BB0; VPXOR (14*32)(inp), CC0, CC0; VPXOR (15*32)(inp), DD0, DD0
VMOVDQU AA0, (12*32)(oup); VMOVDQU BB0, (13*32)(oup); VMOVDQU CC0, (14*32)(oup); VMOVDQU DD0, (15*32)(oup)
LEAQ (32*16)(inp), inp
LEAQ (32*16)(oup), oup
SUBQ $(32*16), inl
JMP openAVX2MainLoop
openAVX2MainLoopDone:
// Handle the various tail sizes efficiently
TESTQ inl, inl
JE openSSEFinalize
CMPQ inl, $128
JBE openAVX2Tail128
CMPQ inl, $256
JBE openAVX2Tail256
CMPQ inl, $384
JBE openAVX2Tail384
JMP openAVX2Tail512
// ----------------------------------------------------------------------------
// Special optimization for buffers smaller than 193 bytes
openAVX2192:
// For up to 192 bytes of ciphertext and 64 bytes for the poly key, we process four blocks
VMOVDQA AA0, AA1
VMOVDQA BB0, BB1
VMOVDQA CC0, CC1
VPADDD avx2IncMask<>(SB), DD0, DD1
VMOVDQA AA0, AA2
VMOVDQA BB0, BB2
VMOVDQA CC0, CC2
VMOVDQA DD0, DD2
VMOVDQA DD1, TT3
MOVQ $10, itr2
openAVX2192InnerCipherLoop:
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1
DECQ itr2
JNE openAVX2192InnerCipherLoop
VPADDD AA2, AA0, AA0; VPADDD AA2, AA1, AA1
VPADDD BB2, BB0, BB0; VPADDD BB2, BB1, BB1
VPADDD CC2, CC0, CC0; VPADDD CC2, CC1, CC1
VPADDD DD2, DD0, DD0; VPADDD TT3, DD1, DD1
VPERM2I128 $0x02, AA0, BB0, TT0
// Clamp and store poly key
VPAND polyClampMask<>(SB), TT0, TT0
VMOVDQA TT0, rsStoreAVX2