// Copyright 2015 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.
// This is an optimized implementation of AES-GCM using AES-NI and CLMUL-NI
// The implementation uses some optimization as described in:
// [1] Gueron, S., Kounavis, M.E.: Intel® Carry-Less Multiplication
// Instruction and its Usage for Computing the GCM Mode rev. 2.02
// [2] Gueron, S., Krasnov, V.: Speeding up Counter Mode in Software and
// Hardware
#include "textflag.h"
#define B0 X0
#define B1 X1
#define B2 X2
#define B3 X3
#define B4 X4
#define B5 X5
#define B6 X6
#define B7 X7
#define ACC0 X8
#define ACC1 X9
#define ACCM X10
#define T0 X11
#define T1 X12
#define T2 X13
#define POLY X14
#define BSWAP X15
DATA bswapMask<>+0x00(SB)/8, $0x08090a0b0c0d0e0f
DATA bswapMask<>+0x08(SB)/8, $0x0001020304050607
DATA gcmPoly<>+0x00(SB)/8, $0x0000000000000001
DATA gcmPoly<>+0x08(SB)/8, $0xc200000000000000
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 bswapMask<>(SB), (NOPTR+RODATA), $16
GLOBL gcmPoly<>(SB), (NOPTR+RODATA), $16
GLOBL andMask<>(SB), (NOPTR+RODATA), $240
// func gcmAesFinish(productTable *[256]byte, tagMask, T *[16]byte, pLen, dLen uint64)
TEXT ·gcmAesFinish(SB),NOSPLIT,$0
#define pTbl DI
#define tMsk SI
#define tPtr DX
#define plen AX
#define dlen CX
MOVQ productTable+0(FP), pTbl
MOVQ tagMask+8(FP), tMsk
MOVQ T+16(FP), tPtr
MOVQ pLen+24(FP), plen
MOVQ dLen+32(FP), dlen
MOVOU (tPtr), ACC0
MOVOU (tMsk), T2
MOVOU bswapMask<>(SB), BSWAP
MOVOU gcmPoly<>(SB), POLY
SHLQ $3, plen
SHLQ $3, dlen
MOVQ plen, B0
PINSRQ $1, dlen, B0
PXOR ACC0, B0
MOVOU (16*14)(pTbl), ACC0
MOVOU (16*15)(pTbl), ACCM
MOVOU ACC0, ACC1
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
MOVOU POLY, T0
PCLMULQDQ $0x01, ACC0, T0
PSHUFD $78, ACC0, ACC0
PXOR T0, ACC0
MOVOU POLY, T0
PCLMULQDQ $0x01, ACC0, T0
PSHUFD $78, ACC0, ACC0
PXOR T0, ACC0
PXOR ACC1, ACC0
PSHUFB BSWAP, ACC0
PXOR T2, ACC0
MOVOU ACC0, (tPtr)
RET
#undef pTbl
#undef tMsk
#undef tPtr
#undef plen
#undef dlen
// func gcmAesInit(productTable *[256]byte, ks []uint32)
TEXT ·gcmAesInit(SB),NOSPLIT,$0
#define dst DI
#define KS SI
#define NR DX
MOVQ productTable+0(FP), dst
MOVQ ks_base+8(FP), KS
MOVQ ks_len+16(FP), NR
SHRQ $2, NR
DECQ NR
MOVOU bswapMask<>(SB), BSWAP
MOVOU gcmPoly<>(SB), POLY
// Encrypt block 0, with the AES key to generate the hash key H
MOVOU (16*0)(KS), B0
MOVOU (16*1)(KS), T0
AESENC T0, B0
MOVOU (16*2)(KS), T0
AESENC T0, B0
MOVOU (16*3)(KS), T0
AESENC T0, B0
MOVOU (16*4)(KS), T0
AESENC T0, B0
MOVOU (16*5)(KS), T0
AESENC T0, B0
MOVOU (16*6)(KS), T0
AESENC T0, B0
MOVOU (16*7)(KS), T0
AESENC T0, B0
MOVOU (16*8)(KS), T0
AESENC T0, B0
MOVOU (16*9)(KS), T0
AESENC T0, B0
MOVOU (16*10)(KS), T0
CMPQ NR, $12
JB initEncLast
AESENC T0, B0
MOVOU (16*11)(KS), T0
AESENC T0, B0
MOVOU (16*12)(KS), T0
JE initEncLast
AESENC T0, B0
MOVOU (16*13)(KS), T0
AESENC T0, B0
MOVOU (16*14)(KS), T0
initEncLast:
AESENCLAST T0, B0
PSHUFB BSWAP, B0
// H * 2
PSHUFD $0xff, B0, T0
MOVOU B0, T1
PSRAL $31, T0
PAND POLY, T0
PSRLL $31, T1
PSLLDQ $4, T1
PSLLL $1, B0
PXOR T0, B0
PXOR T1, B0
// Karatsuba pre-computations
MOVOU B0, (16*14)(dst)
PSHUFD $78, B0, B1
PXOR B0, B1
MOVOU B1, (16*15)(dst)
MOVOU B0, B2
MOVOU B1, B3
// Now prepare powers of H and pre-computations for them
MOVQ $7, AX
initLoop:
MOVOU B2, T0
MOVOU B2, T1
MOVOU B3, T2
PCLMULQDQ $0x00, B0, T0
PCLMULQDQ $0x11, B0, T1
PCLMULQDQ $0x00, B1, T2
PXOR T0, T2
PXOR T1, T2
MOVOU T2, B4
PSLLDQ $8, B4
PSRLDQ $8, T2
PXOR B4, T0
PXOR T2, T1
MOVOU POLY, B2
PCLMULQDQ $0x01, T0, B2
PSHUFD $78, T0, T0
PXOR B2, T0
MOVOU POLY, B2
PCLMULQDQ $0x01, T0, B2
PSHUFD $78, T0, T0
PXOR T0, B2
PXOR T1, B2
MOVOU B2, (16*12)(dst)
PSHUFD $78, B2, B3
PXOR B2, B3
MOVOU B3, (16*13)(dst)
DECQ AX
LEAQ (-16*2)(dst), dst
JNE initLoop
RET
#undef NR
#undef KS
#undef dst
// func gcmAesData(productTable *[256]byte, data []byte, T *[16]byte)
TEXT ·gcmAesData(SB),NOSPLIT,$0
#define pTbl DI
#define aut SI
#define tPtr CX
#define autLen DX
#define reduceRound(a) MOVOU POLY, T0; PCLMULQDQ $0x01, a, T0; PSHUFD $78, a, a; PXOR T0, a
#define mulRoundAAD(X ,i) \
MOVOU (16*(i*2))(pTbl), T1;\
MOVOU T1, T2;\
PCLMULQDQ $0x00, X, T1;\
PXOR T1, ACC0;\
PCLMULQDQ $0x11, X, T2;\
PXOR T2, ACC1;\
PSHUFD $78, X, T1;\
PXOR T1, X;\
MOVOU (16*(i*2+1))(pTbl), T1;\
PCLMULQDQ $0x00, X, T1;\
PXOR T1, ACCM
MOVQ productTable+0(FP), pTbl
MOVQ data_base+8(FP), aut
MOVQ data_len+16(FP), autLen
MOVQ T+32(FP), tPtr
PXOR ACC0, ACC0
MOVOU bswapMask<>(SB), BSWAP
MOVOU gcmPoly<>(SB), POLY
TESTQ autLen, autLen
JEQ dataBail
CMPQ autLen, $13 // optimize the TLS case
JE dataTLS
CMPQ autLen, $128
JB startSinglesLoop
JMP dataOctaLoop
dataTLS:
MOVOU (16*14)(pTbl), T1
MOVOU (16*15)(pTbl), T2
PXOR B0, B0
MOVQ (aut), B0
PINSRD $2, 8(aut), B0
PINSRB $12, 12(aut), B0
XORQ autLen, autLen
JMP dataMul
dataOctaLoop:
CMPQ autLen, $128
JB startSinglesLoop
SUBQ $128, autLen
MOVOU (16*0)(aut), X0
MOVOU (16*1)(aut), X1
MOVOU (16*2)(aut), X2
MOVOU (16*3)(aut), X3
MOVOU (16*4)(aut), X4
MOVOU (16*5)(aut), X5
MOVOU (16*6)(aut), X6
MOVOU (16*7)(aut), X7
LEAQ (16*8)(aut), aut
PSHUFB BSWAP, X0
PSHUFB BSWAP, X1
PSHUFB BSWAP, X2
PSHUFB BSWAP, X3
PSHUFB BSWAP, X4
PSHUFB BSWAP, X5
PSHUFB BSWAP, X6
PSHUFB BSWAP, X7
PXOR ACC0, X0
MOVOU (16*0)(pTbl), ACC0
MOVOU (16*1)(pTbl), ACCM
MOVOU ACC0, ACC1
PSHUFD $78, X0, T1
PXOR X0, T1
PCLMULQDQ $0x00, X0, ACC0
PCLMULQDQ $0x11, X0, ACC1
PCLMULQDQ $0x00, T1, ACCM
mulRoundAAD(X1, 1)
mulRoundAAD(X2, 2)
mulRoundAAD(X3, 3)
mulRoundAAD(X4, 4)
mulRoundAAD(X5, 5)
mulRoundAAD(X6, 6)
mulRoundAAD(X7, 7)
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
JMP dataOctaLoop
startSinglesLoop:
MOVOU (16*14)(pTbl), T1
MOVOU (16*15)(pTbl), T2
dataSinglesLoop:
CMPQ autLen, $16
JB dataEnd
SUBQ $16, autLen
MOVOU (aut), B0
dataMul:
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU T1, ACC0
MOVOU T2, ACCM
MOVOU T1, ACC1
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
MOVOU POLY, T0
PCLMULQDQ $0x01, ACC0, T0
PSHUFD $78, ACC0, ACC0
PXOR T0, ACC0
MOVOU POLY, T0
PCLMULQDQ $0x01, ACC0, T0
PSHUFD $78, ACC0, ACC0
PXOR T0, ACC0
PXOR ACC1, ACC0
LEAQ 16(aut), aut
JMP dataSinglesLoop
dataEnd:
TESTQ autLen, autLen
JEQ dataBail
PXOR B0, B0
LEAQ -1(aut)(autLen*1), aut
dataLoadLoop:
PSLLDQ $1, B0
PINSRB $0, (aut), B0
LEAQ -1(aut), aut
DECQ autLen
JNE dataLoadLoop
JMP dataMul
dataBail:
MOVOU ACC0, (tPtr)
RET
#undef pTbl
#undef aut
#undef tPtr
#undef autLen
// func gcmAesEnc(productTable *[256]byte, dst, src []byte, ctr, T *[16]byte, ks []uint32)
TEXT ·gcmAesEnc(SB),0,$256-96
#define pTbl DI
#define ctx DX
#define ctrPtr CX
#define ptx SI
#define ks AX
#define tPtr R8
#define ptxLen R9
#define aluCTR R10
#define aluTMP R11
#define aluK R12
#define NR R13
#define increment(i) ADDL $1, aluCTR; MOVL aluCTR, aluTMP; XORL aluK, aluTMP; BSWAPL aluTMP; MOVL aluTMP, (3*4 + 8*16 + i*16)(SP)
#define aesRnd(k) AESENC k, B0; AESENC k, B1; AESENC k, B2; AESENC k, B3; AESENC k, B4; AESENC k, B5; AESENC k, B6; AESENC k, B7
#define aesRound(i) MOVOU (16*i)(ks), T0;AESENC T0, B0; AESENC T0, B1; AESENC T0, B2; AESENC T0, B3; AESENC T0, B4; AESENC T0, B5; AESENC T0, B6; AESENC T0, B7
#define aesRndLast(k) AESENCLAST k, B0; AESENCLAST k, B1; AESENCLAST k, B2; AESENCLAST k, B3; AESENCLAST k, B4; AESENCLAST k, B5; AESENCLAST k, B6; AESENCLAST k, B7
#define combinedRound(i) \
MOVOU (16*i)(ks), T0;\
AESENC T0, B0;\
AESENC T0, B1;\
AESENC T0, B2;\
AESENC T0, B3;\
MOVOU (16*(i*2))(pTbl), T1;\
MOVOU T1, T2;\
AESENC T0, B4;\
AESENC T0, B5;\
AESENC T0, B6;\
AESENC T0, B7;\
MOVOU (16*i)(SP), T0;\
PCLMULQDQ $0x00, T0, T1;\
PXOR T1, ACC0;\
PSHUFD $78, T0, T1;\
PCLMULQDQ $0x11, T0, T2;\
PXOR T1, T0;\
PXOR T2, ACC1;\
MOVOU (16*(i*2+1))(pTbl), T2;\
PCLMULQDQ $0x00, T2, T0;\
PXOR T0, ACCM
#define mulRound(i) \
MOVOU (16*i)(SP), T0;\
MOVOU (16*(i*2))(pTbl), T1;\
MOVOU T1, T2;\
PCLMULQDQ $0x00, T0, T1;\
PXOR T1, ACC0;\
PCLMULQDQ $0x11, T0, T2;\
PXOR T2, ACC1;\
PSHUFD $78, T0, T1;\
PXOR T1, T0;\
MOVOU (16*(i*2+1))(pTbl), T1;\
PCLMULQDQ $0x00, T0, T1;\
PXOR T1, ACCM
MOVQ productTable+0(FP), pTbl
MOVQ dst+8(FP), ctx
MOVQ src_base+32(FP), ptx
MOVQ src_len+40(FP), ptxLen
MOVQ ctr+56(FP), ctrPtr
MOVQ T+64(FP), tPtr
MOVQ ks_base+72(FP), ks
MOVQ ks_len+80(FP), NR
SHRQ $2, NR
DECQ NR
MOVOU bswapMask<>(SB), BSWAP
MOVOU gcmPoly<>(SB), POLY
MOVOU (tPtr), ACC0
PXOR ACC1, ACC1
PXOR ACCM, ACCM
MOVOU (ctrPtr), B0
MOVL (3*4)(ctrPtr), aluCTR
MOVOU (ks), T0
MOVL (3*4)(ks), aluK
BSWAPL aluCTR
BSWAPL aluK
PXOR B0, T0
MOVOU T0, (8*16 + 0*16)(SP)
increment(0)
CMPQ ptxLen, $128
JB gcmAesEncSingles
SUBQ $128, ptxLen
// We have at least 8 blocks to encrypt, prepare the rest of the counters
MOVOU T0, (8*16 + 1*16)(SP)
increment(1)
MOVOU T0, (8*16 + 2*16)(SP)
increment(2)
MOVOU T0, (8*16 + 3*16)(SP)
increment(3)
MOVOU T0, (8*16 + 4*16)(SP)
increment(4)
MOVOU T0, (8*16 + 5*16)(SP)
increment(5)
MOVOU T0, (8*16 + 6*16)(SP)
increment(6)
MOVOU T0, (8*16 + 7*16)(SP)
increment(7)
MOVOU (8*16 + 0*16)(SP), B0
MOVOU (8*16 + 1*16)(SP), B1
MOVOU (8*16 + 2*16)(SP), B2
MOVOU (8*16 + 3*16)(SP), B3
MOVOU (8*16 + 4*16)(SP), B4
MOVOU (8*16 + 5*16)(SP), B5
MOVOU (8*16 + 6*16)(SP), B6
MOVOU (8*16 + 7*16)(SP), B7
aesRound(1)
increment(0)
aesRound(2)
increment(1)
aesRound(3)
increment(2)
aesRound(4)
increment(3)
aesRound(5)
increment(4)
aesRound(6)
increment(5)
aesRound(7)
increment(6)
aesRound(8)
increment(7)
aesRound(9)
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB encLast1
aesRnd(T0)
aesRound(11)
MOVOU (16*12)(ks), T0
JE encLast1
aesRnd(T0)
aesRound(13)
MOVOU (16*14)(ks), T0
encLast1:
aesRndLast(T0)
MOVOU (16*0)(ptx), T0
PXOR T0, B0
MOVOU (16*1)(ptx), T0
PXOR T0, B1
MOVOU (16*2)(ptx), T0
PXOR T0, B2
MOVOU (16*3)(ptx), T0
PXOR T0, B3
MOVOU (16*4)(ptx), T0
PXOR T0, B4
MOVOU (16*5)(ptx), T0
PXOR T0, B5
MOVOU (16*6)(ptx), T0
PXOR T0, B6
MOVOU (16*7)(ptx), T0
PXOR T0, B7
MOVOU B0, (16*0)(ctx)
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU B1, (16*1)(ctx)
PSHUFB BSWAP, B1
MOVOU B2, (16*2)(ctx)
PSHUFB BSWAP, B2
MOVOU B3, (16*3)(ctx)
PSHUFB BSWAP, B3
MOVOU B4, (16*4)(ctx)
PSHUFB BSWAP, B4
MOVOU B5, (16*5)(ctx)
PSHUFB BSWAP, B5
MOVOU B6, (16*6)(ctx)
PSHUFB BSWAP, B6
MOVOU B7, (16*7)(ctx)
PSHUFB BSWAP, B7
MOVOU B0, (16*0)(SP)
MOVOU B1, (16*1)(SP)
MOVOU B2, (16*2)(SP)
MOVOU B3, (16*3)(SP)
MOVOU B4, (16*4)(SP)
MOVOU B5, (16*5)(SP)
MOVOU B6, (16*6)(SP)
MOVOU B7, (16*7)(SP)
LEAQ 128(ptx), ptx
LEAQ 128(ctx), ctx
gcmAesEncOctetsLoop:
CMPQ ptxLen, $128
JB gcmAesEncOctetsEnd
SUBQ $128, ptxLen
MOVOU (8*16 + 0*16)(SP), B0
MOVOU (8*16 + 1*16)(SP), B1
MOVOU (8*16 + 2*16)(SP), B2
MOVOU (8*16 + 3*16)(SP), B3
MOVOU (8*16 + 4*16)(SP), B4
MOVOU (8*16 + 5*16)(SP), B5
MOVOU (8*16 + 6*16)(SP), B6
MOVOU (8*16 + 7*16)(SP), B7
MOVOU (16*0)(SP), T0
PSHUFD $78, T0, T1
PXOR T0, T1
MOVOU (16*0)(pTbl), ACC0
MOVOU (16*1)(pTbl), ACCM
MOVOU ACC0, ACC1
PCLMULQDQ $0x00, T1, ACCM
PCLMULQDQ $0x00, T0, ACC0
PCLMULQDQ $0x11, T0, ACC1
combinedRound(1)
increment(0)
combinedRound(2)
increment(1)
combinedRound(3)
increment(2)
combinedRound(4)
increment(3)
combinedRound(5)
increment(4)
combinedRound(6)
increment(5)
combinedRound(7)
increment(6)
aesRound(8)
increment(7)
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
aesRound(9)
reduceRound(ACC0)
PXOR ACC1, ACC0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB encLast2
aesRnd(T0)
aesRound(11)
MOVOU (16*12)(ks), T0
JE encLast2
aesRnd(T0)
aesRound(13)
MOVOU (16*14)(ks), T0
encLast2:
aesRndLast(T0)
MOVOU (16*0)(ptx), T0
PXOR T0, B0
MOVOU (16*1)(ptx), T0
PXOR T0, B1
MOVOU (16*2)(ptx), T0
PXOR T0, B2
MOVOU (16*3)(ptx), T0
PXOR T0, B3
MOVOU (16*4)(ptx), T0
PXOR T0, B4
MOVOU (16*5)(ptx), T0
PXOR T0, B5
MOVOU (16*6)(ptx), T0
PXOR T0, B6
MOVOU (16*7)(ptx), T0
PXOR T0, B7
MOVOU B0, (16*0)(ctx)
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU B1, (16*1)(ctx)
PSHUFB BSWAP, B1
MOVOU B2, (16*2)(ctx)
PSHUFB BSWAP, B2
MOVOU B3, (16*3)(ctx)
PSHUFB BSWAP, B3
MOVOU B4, (16*4)(ctx)
PSHUFB BSWAP, B4
MOVOU B5, (16*5)(ctx)
PSHUFB BSWAP, B5
MOVOU B6, (16*6)(ctx)
PSHUFB BSWAP, B6
MOVOU B7, (16*7)(ctx)
PSHUFB BSWAP, B7
MOVOU B0, (16*0)(SP)
MOVOU B1, (16*1)(SP)
MOVOU B2, (16*2)(SP)
MOVOU B3, (16*3)(SP)
MOVOU B4, (16*4)(SP)
MOVOU B5, (16*5)(SP)
MOVOU B6, (16*6)(SP)
MOVOU B7, (16*7)(SP)
LEAQ 128(ptx), ptx
LEAQ 128(ctx), ctx
JMP gcmAesEncOctetsLoop
gcmAesEncOctetsEnd:
MOVOU (16*0)(SP), T0
MOVOU (16*0)(pTbl), ACC0
MOVOU (16*1)(pTbl), ACCM
MOVOU ACC0, ACC1
PSHUFD $78, T0, T1
PXOR T0, T1
PCLMULQDQ $0x00, T0, ACC0
PCLMULQDQ $0x11, T0, ACC1
PCLMULQDQ $0x00, T1, ACCM
mulRound(1)
mulRound(2)
mulRound(3)
mulRound(4)
mulRound(5)
mulRound(6)
mulRound(7)
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
TESTQ ptxLen, ptxLen
JE gcmAesEncDone
SUBQ $7, aluCTR
gcmAesEncSingles:
MOVOU (16*1)(ks), B1
MOVOU (16*2)(ks), B2
MOVOU (16*3)(ks), B3
MOVOU (16*4)(ks), B4
MOVOU (16*5)(ks), B5
MOVOU (16*6)(ks), B6
MOVOU (16*7)(ks), B7
MOVOU (16*14)(pTbl), T2
gcmAesEncSinglesLoop:
CMPQ ptxLen, $16
JB gcmAesEncTail
SUBQ $16, ptxLen
MOVOU (8*16 + 0*16)(SP), B0
increment(0)
AESENC B1, B0
AESENC B2, B0
AESENC B3, B0
AESENC B4, B0
AESENC B5, B0
AESENC B6, B0
AESENC B7, B0
MOVOU (16*8)(ks), T0
AESENC T0, B0
MOVOU (16*9)(ks), T0
AESENC T0, B0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB encLast3
AESENC T0, B0
MOVOU (16*11)(ks), T0
AESENC T0, B0
MOVOU (16*12)(ks), T0
JE encLast3
AESENC T0, B0
MOVOU (16*13)(ks), T0
AESENC T0, B0
MOVOU (16*14)(ks), T0
encLast3:
AESENCLAST T0, B0
MOVOU (ptx), T0
PXOR T0, B0
MOVOU B0, (ctx)
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU T2, ACC0
MOVOU T2, ACC1
MOVOU (16*15)(pTbl), ACCM
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
LEAQ (16*1)(ptx), ptx
LEAQ (16*1)(ctx), ctx
JMP gcmAesEncSinglesLoop
gcmAesEncTail:
TESTQ ptxLen, ptxLen
JE gcmAesEncDone
MOVOU (8*16 + 0*16)(SP), B0
AESENC B1, B0
AESENC B2, B0
AESENC B3, B0
AESENC B4, B0
AESENC B5, B0
AESENC B6, B0
AESENC B7, B0
MOVOU (16*8)(ks), T0
AESENC T0, B0
MOVOU (16*9)(ks), T0
AESENC T0, B0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB encLast4
AESENC T0, B0
MOVOU (16*11)(ks), T0
AESENC T0, B0
MOVOU (16*12)(ks), T0
JE encLast4
AESENC T0, B0
MOVOU (16*13)(ks), T0
AESENC T0, B0
MOVOU (16*14)(ks), T0
encLast4:
AESENCLAST T0, B0
MOVOU B0, T0
LEAQ -1(ptx)(ptxLen*1), ptx
MOVQ ptxLen, aluTMP
SHLQ $4, aluTMP
LEAQ andMask<>(SB), aluCTR
MOVOU -16(aluCTR)(aluTMP*1), T1
PXOR B0, B0
ptxLoadLoop:
PSLLDQ $1, B0
PINSRB $0, (ptx), B0
LEAQ -1(ptx), ptx
DECQ ptxLen
JNE ptxLoadLoop
PXOR T0, B0
PAND T1, B0
MOVOU B0, (ctx) // I assume there is always space, due to TAG in the end of the CT
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU T2, ACC0
MOVOU T2, ACC1
MOVOU (16*15)(pTbl), ACCM
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
gcmAesEncDone:
MOVOU ACC0, (tPtr)
RET
#undef increment
// func gcmAesDec(productTable *[256]byte, dst, src []byte, ctr, T *[16]byte, ks []uint32)
TEXT ·gcmAesDec(SB),0,$128-96
#define increment(i) ADDL $1, aluCTR; MOVL aluCTR, aluTMP; XORL aluK, aluTMP; BSWAPL aluTMP; MOVL aluTMP, (3*4 + i*16)(SP)
#define combinedDecRound(i) \
MOVOU (16*i)(ks), T0;\
AESENC T0, B0;\
AESENC T0, B1;\
AESENC T0, B2;\
AESENC T0, B3;\
MOVOU (16*(i*2))(pTbl), T1;\
MOVOU T1, T2;\
AESENC T0, B4;\
AESENC T0, B5;\
AESENC T0, B6;\
AESENC T0, B7;\
MOVOU (16*i)(ctx), T0;\
PSHUFB BSWAP, T0;\
PCLMULQDQ $0x00, T0, T1;\
PXOR T1, ACC0;\
PSHUFD $78, T0, T1;\
PCLMULQDQ $0x11, T0, T2;\
PXOR T1, T0;\
PXOR T2, ACC1;\
MOVOU (16*(i*2+1))(pTbl), T2;\
PCLMULQDQ $0x00, T2, T0;\
PXOR T0, ACCM
MOVQ productTable+0(FP), pTbl
MOVQ dst+8(FP), ptx
MOVQ src_base+32(FP), ctx
MOVQ src_len+40(FP), ptxLen
MOVQ ctr+56(FP), ctrPtr
MOVQ T+64(FP), tPtr
MOVQ ks_base+72(FP), ks
MOVQ ks_len+80(FP), NR
SHRQ $2, NR
DECQ NR
MOVOU bswapMask<>(SB), BSWAP
MOVOU gcmPoly<>(SB), POLY
MOVOU (tPtr), ACC0
PXOR ACC1, ACC1
PXOR ACCM, ACCM
MOVOU (ctrPtr), B0
MOVL (3*4)(ctrPtr), aluCTR
MOVOU (ks), T0
MOVL (3*4)(ks), aluK
BSWAPL aluCTR
BSWAPL aluK
PXOR B0, T0
MOVOU T0, (0*16)(SP)
increment(0)
CMPQ ptxLen, $128
JB gcmAesDecSingles
MOVOU T0, (1*16)(SP)
increment(1)
MOVOU T0, (2*16)(SP)
increment(2)
MOVOU T0, (3*16)(SP)
increment(3)
MOVOU T0, (4*16)(SP)
increment(4)
MOVOU T0, (5*16)(SP)
increment(5)
MOVOU T0, (6*16)(SP)
increment(6)
MOVOU T0, (7*16)(SP)
increment(7)
gcmAesDecOctetsLoop:
CMPQ ptxLen, $128
JB gcmAesDecEndOctets
SUBQ $128, ptxLen
MOVOU (0*16)(SP), B0
MOVOU (1*16)(SP), B1
MOVOU (2*16)(SP), B2
MOVOU (3*16)(SP), B3
MOVOU (4*16)(SP), B4
MOVOU (5*16)(SP), B5
MOVOU (6*16)(SP), B6
MOVOU (7*16)(SP), B7
MOVOU (16*0)(ctx), T0
PSHUFB BSWAP, T0
PXOR ACC0, T0
PSHUFD $78, T0, T1
PXOR T0, T1
MOVOU (16*0)(pTbl), ACC0
MOVOU (16*1)(pTbl), ACCM
MOVOU ACC0, ACC1
PCLMULQDQ $0x00, T1, ACCM
PCLMULQDQ $0x00, T0, ACC0
PCLMULQDQ $0x11, T0, ACC1
combinedDecRound(1)
increment(0)
combinedDecRound(2)
increment(1)
combinedDecRound(3)
increment(2)
combinedDecRound(4)
increment(3)
combinedDecRound(5)
increment(4)
combinedDecRound(6)
increment(5)
combinedDecRound(7)
increment(6)
aesRound(8)
increment(7)
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
aesRound(9)
reduceRound(ACC0)
PXOR ACC1, ACC0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB decLast1
aesRnd(T0)
aesRound(11)
MOVOU (16*12)(ks), T0
JE decLast1
aesRnd(T0)
aesRound(13)
MOVOU (16*14)(ks), T0
decLast1:
aesRndLast(T0)
MOVOU (16*0)(ctx), T0
PXOR T0, B0
MOVOU (16*1)(ctx), T0
PXOR T0, B1
MOVOU (16*2)(ctx), T0
PXOR T0, B2
MOVOU (16*3)(ctx), T0
PXOR T0, B3
MOVOU (16*4)(ctx), T0
PXOR T0, B4
MOVOU (16*5)(ctx), T0
PXOR T0, B5
MOVOU (16*6)(ctx), T0
PXOR T0, B6
MOVOU (16*7)(ctx), T0
PXOR T0, B7
MOVOU B0, (16*0)(ptx)
MOVOU B1, (16*1)(ptx)
MOVOU B2, (16*2)(ptx)
MOVOU B3, (16*3)(ptx)
MOVOU B4, (16*4)(ptx)
MOVOU B5, (16*5)(ptx)
MOVOU B6, (16*6)(ptx)
MOVOU B7, (16*7)(ptx)
LEAQ 128(ptx), ptx
LEAQ 128(ctx), ctx
JMP gcmAesDecOctetsLoop
gcmAesDecEndOctets:
SUBQ $7, aluCTR
gcmAesDecSingles:
MOVOU (16*1)(ks), B1
MOVOU (16*2)(ks), B2
MOVOU (16*3)(ks), B3
MOVOU (16*4)(ks), B4
MOVOU (16*5)(ks), B5
MOVOU (16*6)(ks), B6
MOVOU (16*7)(ks), B7
MOVOU (16*14)(pTbl), T2
gcmAesDecSinglesLoop:
CMPQ ptxLen, $16
JB gcmAesDecTail
SUBQ $16, ptxLen
MOVOU (ctx), B0
MOVOU B0, T1
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU T2, ACC0
MOVOU T2, ACC1
MOVOU (16*15)(pTbl), ACCM
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
MOVOU (0*16)(SP), B0
increment(0)
AESENC B1, B0
AESENC B2, B0
AESENC B3, B0
AESENC B4, B0
AESENC B5, B0
AESENC B6, B0
AESENC B7, B0
MOVOU (16*8)(ks), T0
AESENC T0, B0
MOVOU (16*9)(ks), T0
AESENC T0, B0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB decLast2
AESENC T0, B0
MOVOU (16*11)(ks), T0
AESENC T0, B0
MOVOU (16*12)(ks), T0
JE decLast2
AESENC T0, B0
MOVOU (16*13)(ks), T0
AESENC T0, B0
MOVOU (16*14)(ks), T0
decLast2:
AESENCLAST T0, B0
PXOR T1, B0
MOVOU B0, (ptx)
LEAQ (16*1)(ptx), ptx
LEAQ (16*1)(ctx), ctx
JMP gcmAesDecSinglesLoop
gcmAesDecTail:
TESTQ ptxLen, ptxLen
JE gcmAesDecDone
MOVQ ptxLen, aluTMP
SHLQ $4, aluTMP
LEAQ andMask<>(SB), aluCTR
MOVOU -16(aluCTR)(aluTMP*1), T1
MOVOU (ctx), B0 // I assume there is TAG attached to the ctx, and there is no read overflow
PAND T1, B0
MOVOU B0, T1
PSHUFB BSWAP, B0
PXOR ACC0, B0
MOVOU (16*14)(pTbl), ACC0
MOVOU (16*15)(pTbl), ACCM
MOVOU ACC0, ACC1
PCLMULQDQ $0x00, B0, ACC0
PCLMULQDQ $0x11, B0, ACC1
PSHUFD $78, B0, T0
PXOR B0, T0
PCLMULQDQ $0x00, T0, ACCM
PXOR ACC0, ACCM
PXOR ACC1, ACCM
MOVOU ACCM, T0
PSRLDQ $8, ACCM
PSLLDQ $8, T0
PXOR ACCM, ACC1
PXOR T0, ACC0
reduceRound(ACC0)
reduceRound(ACC0)
PXOR ACC1, ACC0
MOVOU (0*16)(SP), B0
increment(0)
AESENC B1, B0
AESENC B2, B0
AESENC B3, B0
AESENC B4, B0
AESENC B5, B0
AESENC B6, B0
AESENC B7, B0
MOVOU (16*8)(ks), T0
AESENC T0, B0
MOVOU (16*9)(ks), T0
AESENC T0, B0
MOVOU (16*10)(ks), T0
CMPQ NR, $12
JB decLast3
AESENC T0, B0
MOVOU (16*11)(ks), T0
AESENC T0, B0
MOVOU (16*12)(ks), T0
JE decLast3
AESENC T0, B0
MOVOU (16*13)(ks), T0
AESENC T0, B0
MOVOU (16*14)(ks), T0
decLast3:
AESENCLAST T0, B0
PXOR T1, B0
ptxStoreLoop:
PEXTRB $0, B0, (ptx)
PSRLDQ $1, B0
LEAQ 1(ptx), ptx
DECQ ptxLen
JNE ptxStoreLoop
gcmAesDecDone:
MOVOU ACC0, (tPtr)
RET
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