diff --git a/sm4/xts_arm64.s b/sm4/xts_arm64.s
index 07e7cea..651ebb6 100644
--- a/sm4/xts_arm64.s
+++ b/sm4/xts_arm64.s
@@ -372,545 +372,12 @@ xtsSm4EncDone:
 
 // func encryptSm4XtsGB(xk *uint32, tweak *[BlockSize]byte, dst, src []byte)
 TEXT ·encryptSm4XtsGB(SB),0,$128-64
-	LOAD_SM4_AESNI_CONSTS()
-	MOVD xk+0(FP), rk
-	MOVD tweak+8(FP), twPtr
-	MOVD dst+16(FP), dstPtr
-	MOVD src+40(FP), srcPtr
-	MOVD src_len+48(FP), srcPtrLen
-
-	VEOR	POLY.B16, POLY.B16, POLY.B16
-	VEOR	ZERO.B16, ZERO.B16, ZERO.B16
-
-	MOVD	$0xE1, I
-	LSL	$56, I
-	VMOV	I, POLY.D[1]
-
-	MOVD rk, rkSave
-	VLD1 (twPtr), [TW.B16]
-
-xtsSm4EncOctets:
-	CMP	$128, srcPtrLen
-	BLT	xtsSm4EncNibbles
-	SUB	$128, srcPtrLen
-
-	prepareGB8Tweaks
-	load8blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-encOctetsEnc8Blocks:
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B0, B1, B2, B3, B4, B5, B6, B7)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B1, B2, B3, B0, B5, B6, B7, B4)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B2, B3, B0, B1, B6, B7, B4, B5)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B3, B0, B1, B2, B7, B4, B5, B6)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE encOctetsEnc8Blocks
-
-	store8blocks
-	B	xtsSm4EncOctets
-
-xtsSm4EncNibbles:
-	CMP	$64, srcPtrLen
-	BLT	xtsSm4EncSingles
-	SUB	$64, srcPtrLen
-
-	prepareGB4Tweaks
-	load4blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-encNibblesEnc4Blocks:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE encNibblesEnc4Blocks
-	
-	store4blocks
-
-xtsSm4EncSingles:
-	CMP	$16, srcPtrLen
-	BLT	xtsSm4EncTail
-	SUB	$16, srcPtrLen
-
-	loadOneBlock
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-encSinglesEnc4Blocks:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE encSinglesEnc4Blocks
-
-	storeOneBlock
-	mul2GBInline
-	B	xtsSm4EncSingles
-
-xtsSm4EncTail:
-	CBZ	srcPtrLen, xtsSm4EncDone
-	SUB $16, dstPtr, R7
-	MOVD R7, R9
-	MOVD RSP, R8
-	VLD1 (R7), [B0.B16]
-	VST1 [B0.B16], (R8)
-
-	TBZ	$3, srcPtrLen, less_than8
-	MOVD.P 8(srcPtr), R11
-	MOVD.P R11, 8(R8)
-	MOVD.P 8(R7), R12
-	MOVD.P R12, 8(dstPtr)
-
-less_than8:
-	TBZ	$2, srcPtrLen, less_than4
-	MOVWU.P 4(srcPtr), R11
-	MOVWU.P R11, 4(R8)
-	MOVWU.P 4(R7), R12
-	MOVWU.P R12, 4(dstPtr)
-
-less_than4:
-	TBZ	$1, srcPtrLen, less_than2
-	MOVHU.P 2(srcPtr), R11
-	MOVHU.P R11, 2(R8)
-	MOVHU.P 2(R7), R12
-	MOVHU.P R12, 2(dstPtr)
-
-less_than2:
-	TBZ	$0, srcPtrLen, xtsSm4EncTailEnc
-	MOVBU (srcPtr), R11
-	MOVBU R11, (R8)
-	MOVBU (R7), R12
-	MOVBU R12, (dstPtr)
-
-xtsSm4EncTailEnc:
-	VLD1 (RSP), [B0.B16]
-	VEOR TW.B16, B0.B16, B0.B16
-	VREV32 B0.B16, B0.B16
-	VMOV B0.S[1], B1.S[0]
-	VMOV B0.S[2], B2.S[0]
-	VMOV B0.S[3], B3.S[0]
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-tailEncLoop:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE tailEncLoop
-
-	VMOV B2.S[0], B3.S[1]
-	VMOV B1.S[0], B3.S[2]
-	VMOV B0.S[0], B3.S[3]
-	VREV32 B3.B16, B3.B16
-
-	VEOR TW.B16, B3.B16, B3.B16
-	VST1 [B3.B16], (R9)
-
-xtsSm4EncDone:
-	VST1 [TW.B16], (twPtr)
 	RET
 
 // func decryptSm4Xts(xk *uint32, tweak *[BlockSize]byte, dst, src []byte)
 TEXT ·decryptSm4Xts(SB),0,$128-64
-	LOAD_SM4_AESNI_CONSTS()
-	MOVD xk+0(FP), rk
-	MOVD tweak+8(FP), twPtr
-	MOVD dst+16(FP), dstPtr
-	MOVD src+40(FP), srcPtr
-	MOVD src_len+48(FP), srcPtrLen
-
-	VEOR	POLY.B16, POLY.B16, POLY.B16
-	VEOR	ZERO.B16, ZERO.B16, ZERO.B16
-
-	MOVD	$0x87, I
-	VMOV	I, POLY.D[0]
-
-	MOVD rk, rkSave
-	VLD1 (twPtr), [TW.B16]
-
-xtsSm4DecOctets:
-	CMP	$128, srcPtrLen
-	BLT	xtsSm4DecNibbles
-	SUB	$128, srcPtrLen
-
-	prepare8Tweaks
-	load8blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decOctetsDec8Blocks:
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B0, B1, B2, B3, B4, B5, B6, B7)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B1, B2, B3, B0, B5, B6, B7, B4)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B2, B3, B0, B1, B6, B7, B4, B5)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B3, B0, B1, B2, B7, B4, B5, B6)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE decOctetsDec8Blocks
-
-	store8blocks
-	B	xtsSm4DecOctets
-
-xtsSm4DecNibbles:
-	CMP	$64, srcPtrLen
-	BLT	xtsSm4DecSingles
-	SUB	$64, srcPtrLen
-
-	prepare4Tweaks
-	load4blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decNibblesDec4Blocks:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE decNibblesDec4Blocks
-	
-	store4blocks
-
-xtsSm4DecSingles:
-	CMP	$32, srcPtrLen
-	BLT	xtsSm4DecSingles
-	SUB	$16, srcPtrLen
-
-	loadOneBlock
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decSinglesDec4Blocks:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decSinglesDec4Blocks
-
-	storeOneBlock
-	mul2Inline
-
-	B	xtsSm4DecSingles
-
-xtsSm4DecTail:
-	CBZ	srcPtrLen, xtsSm4DecDone
-	
-	CMP	$16, srcPtrLen
-	BEQ xtsSm4DecLastBlock
-
-	VMOV TW.B16, B4.B16
-	mul2Inline
-	loadOneBlock
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decLastCompleteBlockLoop:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decLastCompleteBlockLoop
-	storeOneBlock
-	VMOV B4.B16, TW.B16
-	VST1 [B3.B16], (RSP)
-
-	SUB	$16, srcPtrLen
-	SUB $16, dstPtr, R7
-	MOVD R7, R9
-	MOVD RSP, R8
-
-	TBZ	$3, srcPtrLen, less_than8
-	MOVD.P 8(srcPtr), R11
-	MOVD.P R11, 8(R8)
-	MOVD.P 8(R7), R12
-	MOVD.P R12, 8(dstPtr)
-
-less_than8:
-	TBZ	$2, srcPtrLen, less_than4
-	MOVWU.P 4(srcPtr), R11
-	MOVWU.P R11, 4(R8)
-	MOVWU.P 4(R7), R12
-	MOVWU.P R12, 4(dstPtr)
-
-less_than4:
-	TBZ	$1, srcPtrLen, less_than2
-	MOVHU.P 2(srcPtr), R11
-	MOVHU.P R11, 2(R8)
-	MOVHU.P 2(R7), R12
-	MOVHU.P R12, 2(dstPtr)
-
-less_than2:
-	TBZ	$0, srcPtrLen, xtsSm4DecTailEnc
-	MOVBU (srcPtr), R11
-	MOVBU R11, (R8)
-	MOVBU (R7), R12
-	MOVBU R12, (dstPtr)
-
-xtsSm4DecTailEnc:
-	VLD1 (RSP), [B0.B16]
-	VEOR TW.B16, B0.B16, B0.B16
-	VREV32 B0.B16, B0.B16
-	VMOV B0.S[1], B1.S[0]
-	VMOV B0.S[2], B2.S[0]
-	VMOV B0.S[3], B3.S[0]
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-tailDecLoop:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE tailDecLoop
-
-	VMOV B2.S[0], B3.S[1]
-	VMOV B1.S[0], B3.S[2]
-	VMOV B0.S[0], B3.S[3]
-	VREV32 B3.B16, B3.B16
-
-	VEOR TW.B16, B3.B16, B3.B16
-	VST1 [B3.B16], (R9)
-
-	B xtsSm4DecDone
-
-xtsSm4DecLastBlock:
-	loadOneBlock
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decLastBlockLoop:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decLastBlockLoop
-
-	storeOneBlock
-	mul2Inline
-
-xtsSm4DecDone:
-	VST1 [TW.B16], (twPtr)
 	RET
 
 // func decryptSm4XtsGB(xk *uint32, tweak *[BlockSize]byte, dst, src []byte)
 TEXT ·decryptSm4XtsGB(SB),0,$128-64
-	LOAD_SM4_AESNI_CONSTS()
-	MOVD xk+0(FP), rk
-	MOVD tweak+8(FP), twPtr
-	MOVD dst+16(FP), dstPtr
-	MOVD src+40(FP), srcPtr
-	MOVD src_len+48(FP), srcPtrLen
-
-	VEOR	POLY.B16, POLY.B16, POLY.B16
-	VEOR	ZERO.B16, ZERO.B16, ZERO.B16
-
-	MOVD	$0xE1, I
-	LSL	$56, I
-	VMOV	I, POLY.D[1]
-
-	MOVD rk, rkSave
-	VLD1 (twPtr), [TW.B16]
-
-xtsSm4DecOctets:
-	CMP	$128, srcPtrLen
-	BLT	xtsSm4DecNibbles
-	SUB	$128, srcPtrLen
-
-	prepareGB8Tweaks
-	load8blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decOctetsDec8Blocks:
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B0, B1, B2, B3, B4, B5, B6, B7)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B1, B2, B3, B0, B5, B6, B7, B4)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B2, B3, B0, B1, B6, B7, B4, B5)
-			SM4_8BLOCKS_ROUND(rk, R19, K0, K1, K2, K3, B3, B0, B1, B2, B7, B4, B5, B6)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE decOctetsDec8Blocks
-
-	store8blocks
-	B	xtsSm4DecOctets
-
-xtsSm4DecNibbles:
-	CMP	$64, srcPtrLen
-	BLT	xtsSm4DecSingles
-	SUB	$64, srcPtrLen
-
-	prepareGB4Tweaks
-	load4blocks
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decNibblesDec4Blocks:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-
-		ADD $1, R13
-		CMP $8, R13
-		BNE decNibblesDec4Blocks
-	
-	store4blocks
-
-xtsSm4DecSingles:
-	CMP	$32, srcPtrLen
-	BLT	xtsSm4DecSingles
-	SUB	$16, srcPtrLen
-
-	loadOneBlock
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decSinglesDec4Blocks:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decSinglesDec4Blocks
-
-	storeOneBlock
-	mul2GBInline
-
-	B	xtsSm4DecSingles
-
-xtsSm4DecTail:
-	CBZ	srcPtrLen, xtsSm4DecDone
-	
-	CMP	$16, srcPtrLen
-	BEQ xtsSm4DecLastBlock
-
-	VMOV TW.B16, B4.B16
-	mul2GBInline
-	loadOneBlock
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decLastCompleteBlockLoop:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decLastCompleteBlockLoop
-	storeOneBlock
-	VMOV B4.B16, TW.B16
-	VST1 [B3.B16], (RSP)
-
-	SUB	$16, srcPtrLen
-	SUB $16, dstPtr, R7
-	MOVD R7, R9
-	MOVD RSP, R8
-
-	TBZ	$3, srcPtrLen, less_than8
-	MOVD.P 8(srcPtr), R11
-	MOVD.P R11, 8(R8)
-	MOVD.P 8(R7), R12
-	MOVD.P R12, 8(dstPtr)
-
-less_than8:
-	TBZ	$2, srcPtrLen, less_than4
-	MOVWU.P 4(srcPtr), R11
-	MOVWU.P R11, 4(R8)
-	MOVWU.P 4(R7), R12
-	MOVWU.P R12, 4(dstPtr)
-
-less_than4:
-	TBZ	$1, srcPtrLen, less_than2
-	MOVHU.P 2(srcPtr), R11
-	MOVHU.P R11, 2(R8)
-	MOVHU.P 2(R7), R12
-	MOVHU.P R12, 2(dstPtr)
-
-less_than2:
-	TBZ	$0, srcPtrLen, xtsSm4DecTailEnc
-	MOVBU (srcPtr), R11
-	MOVBU R11, (R8)
-	MOVBU (R7), R12
-	MOVBU R12, (dstPtr)
-
-xtsSm4DecTailEnc:
-	VLD1 (RSP), [B0.B16]
-	VEOR TW.B16, B0.B16, B0.B16
-	VREV32 B0.B16, B0.B16
-	VMOV B0.S[1], B1.S[0]
-	VMOV B0.S[2], B2.S[0]
-	VMOV B0.S[3], B3.S[0]
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-tailDecLoop:
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE tailDecLoop
-
-	VMOV B2.S[0], B3.S[1]
-	VMOV B1.S[0], B3.S[2]
-	VMOV B0.S[0], B3.S[3]
-	VREV32 B3.B16, B3.B16
-
-	VEOR TW.B16, B3.B16, B3.B16
-	VST1 [B3.B16], (R9)
-
-	B xtsSm4DecDone
-
-xtsSm4DecLastBlock:
-	loadOneBlock
-
-	MOVD rkSave, rk
-	EOR R13, R13
-
-decLastBlockLoop:	
-		SM4_ROUND(rk, R19, K0, K1, K2, B0, B1, B2, B3)
-		SM4_ROUND(rk, R19, K0, K1, K2, B1, B2, B3, B0)
-		SM4_ROUND(rk, R19, K0, K1, K2, B2, B3, B0, B1)
-		SM4_ROUND(rk, R19, K0, K1, K2, B3, B0, B1, B2)
-		ADD $1, R13
-		CMP $8, R13
-		BNE decLastBlockLoop
-
-	storeOneBlock
-	mul2GBInline
-
-xtsSm4DecDone:
-	VST1 [TW.B16], (twPtr)
 	RET