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67cfa5d3b7
Update the AES-XTS implementation based on NEON instructions so that it can deal with inputs whose size is not a multiple of the cipher block size. This is part of the original XTS specification, but was never implemented before in the Linux kernel. Since the bit slicing driver is only faster if it can operate on at least 7 blocks of input at the same time, let's reuse the alternate path we are adding for CTS to process any data tail whose size is not a multiple of 128 bytes. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
680 lines
16 KiB
ArmAsm
680 lines
16 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES
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*
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* Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
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*/
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/* included by aes-ce.S and aes-neon.S */
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.text
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.align 4
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#ifndef MAX_STRIDE
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#define MAX_STRIDE 4
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#endif
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#if MAX_STRIDE == 4
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#define ST4(x...) x
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#define ST5(x...)
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#else
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#define ST4(x...)
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#define ST5(x...) x
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#endif
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aes_encrypt_block4x:
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encrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7
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ret
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ENDPROC(aes_encrypt_block4x)
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aes_decrypt_block4x:
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decrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7
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ret
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ENDPROC(aes_decrypt_block4x)
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#if MAX_STRIDE == 5
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aes_encrypt_block5x:
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encrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7
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ret
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ENDPROC(aes_encrypt_block5x)
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aes_decrypt_block5x:
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decrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7
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ret
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ENDPROC(aes_decrypt_block5x)
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#endif
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/*
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* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks)
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* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks)
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*/
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AES_ENTRY(aes_ecb_encrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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enc_prepare w3, x2, x5
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.LecbencloopNx:
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subs w4, w4, #MAX_STRIDE
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bmi .Lecbenc1x
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
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ST4( bl aes_encrypt_block4x )
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ST5( ld1 {v4.16b}, [x1], #16 )
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ST5( bl aes_encrypt_block5x )
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st1 {v0.16b-v3.16b}, [x0], #64
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ST5( st1 {v4.16b}, [x0], #16 )
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b .LecbencloopNx
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.Lecbenc1x:
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adds w4, w4, #MAX_STRIDE
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beq .Lecbencout
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.Lecbencloop:
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ld1 {v0.16b}, [x1], #16 /* get next pt block */
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encrypt_block v0, w3, x2, x5, w6
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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bne .Lecbencloop
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.Lecbencout:
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ldp x29, x30, [sp], #16
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ret
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AES_ENDPROC(aes_ecb_encrypt)
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AES_ENTRY(aes_ecb_decrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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dec_prepare w3, x2, x5
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.LecbdecloopNx:
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subs w4, w4, #MAX_STRIDE
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bmi .Lecbdec1x
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
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ST4( bl aes_decrypt_block4x )
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ST5( ld1 {v4.16b}, [x1], #16 )
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ST5( bl aes_decrypt_block5x )
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st1 {v0.16b-v3.16b}, [x0], #64
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ST5( st1 {v4.16b}, [x0], #16 )
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b .LecbdecloopNx
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.Lecbdec1x:
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adds w4, w4, #MAX_STRIDE
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beq .Lecbdecout
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.Lecbdecloop:
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ld1 {v0.16b}, [x1], #16 /* get next ct block */
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decrypt_block v0, w3, x2, x5, w6
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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bne .Lecbdecloop
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.Lecbdecout:
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ldp x29, x30, [sp], #16
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ret
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AES_ENDPROC(aes_ecb_decrypt)
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/*
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* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 iv[])
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* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 iv[])
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* aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[],
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* int rounds, int blocks, u8 iv[],
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* u32 const rk2[]);
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* aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[],
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* int rounds, int blocks, u8 iv[],
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* u32 const rk2[]);
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*/
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AES_ENTRY(aes_essiv_cbc_encrypt)
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ld1 {v4.16b}, [x5] /* get iv */
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mov w8, #14 /* AES-256: 14 rounds */
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enc_prepare w8, x6, x7
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encrypt_block v4, w8, x6, x7, w9
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enc_switch_key w3, x2, x6
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b .Lcbcencloop4x
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AES_ENTRY(aes_cbc_encrypt)
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ld1 {v4.16b}, [x5] /* get iv */
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enc_prepare w3, x2, x6
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.Lcbcencloop4x:
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subs w4, w4, #4
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bmi .Lcbcenc1x
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
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eor v0.16b, v0.16b, v4.16b /* ..and xor with iv */
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encrypt_block v0, w3, x2, x6, w7
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eor v1.16b, v1.16b, v0.16b
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encrypt_block v1, w3, x2, x6, w7
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eor v2.16b, v2.16b, v1.16b
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encrypt_block v2, w3, x2, x6, w7
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eor v3.16b, v3.16b, v2.16b
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encrypt_block v3, w3, x2, x6, w7
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st1 {v0.16b-v3.16b}, [x0], #64
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mov v4.16b, v3.16b
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b .Lcbcencloop4x
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.Lcbcenc1x:
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adds w4, w4, #4
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beq .Lcbcencout
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.Lcbcencloop:
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ld1 {v0.16b}, [x1], #16 /* get next pt block */
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eor v4.16b, v4.16b, v0.16b /* ..and xor with iv */
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encrypt_block v4, w3, x2, x6, w7
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st1 {v4.16b}, [x0], #16
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subs w4, w4, #1
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bne .Lcbcencloop
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.Lcbcencout:
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st1 {v4.16b}, [x5] /* return iv */
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ret
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AES_ENDPROC(aes_cbc_encrypt)
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AES_ENDPROC(aes_essiv_cbc_encrypt)
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AES_ENTRY(aes_essiv_cbc_decrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ld1 {cbciv.16b}, [x5] /* get iv */
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mov w8, #14 /* AES-256: 14 rounds */
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enc_prepare w8, x6, x7
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encrypt_block cbciv, w8, x6, x7, w9
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b .Lessivcbcdecstart
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AES_ENTRY(aes_cbc_decrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ld1 {cbciv.16b}, [x5] /* get iv */
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.Lessivcbcdecstart:
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dec_prepare w3, x2, x6
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.LcbcdecloopNx:
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subs w4, w4, #MAX_STRIDE
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bmi .Lcbcdec1x
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
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#if MAX_STRIDE == 5
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ld1 {v4.16b}, [x1], #16 /* get 1 ct block */
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mov v5.16b, v0.16b
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mov v6.16b, v1.16b
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mov v7.16b, v2.16b
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bl aes_decrypt_block5x
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sub x1, x1, #32
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eor v0.16b, v0.16b, cbciv.16b
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eor v1.16b, v1.16b, v5.16b
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ld1 {v5.16b}, [x1], #16 /* reload 1 ct block */
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ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */
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eor v2.16b, v2.16b, v6.16b
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eor v3.16b, v3.16b, v7.16b
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eor v4.16b, v4.16b, v5.16b
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#else
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mov v4.16b, v0.16b
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mov v5.16b, v1.16b
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mov v6.16b, v2.16b
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bl aes_decrypt_block4x
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sub x1, x1, #16
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eor v0.16b, v0.16b, cbciv.16b
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eor v1.16b, v1.16b, v4.16b
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ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */
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eor v2.16b, v2.16b, v5.16b
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eor v3.16b, v3.16b, v6.16b
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#endif
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st1 {v0.16b-v3.16b}, [x0], #64
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ST5( st1 {v4.16b}, [x0], #16 )
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b .LcbcdecloopNx
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.Lcbcdec1x:
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adds w4, w4, #MAX_STRIDE
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beq .Lcbcdecout
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.Lcbcdecloop:
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ld1 {v1.16b}, [x1], #16 /* get next ct block */
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mov v0.16b, v1.16b /* ...and copy to v0 */
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decrypt_block v0, w3, x2, x6, w7
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eor v0.16b, v0.16b, cbciv.16b /* xor with iv => pt */
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mov cbciv.16b, v1.16b /* ct is next iv */
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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bne .Lcbcdecloop
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.Lcbcdecout:
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st1 {cbciv.16b}, [x5] /* return iv */
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ldp x29, x30, [sp], #16
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ret
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AES_ENDPROC(aes_cbc_decrypt)
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AES_ENDPROC(aes_essiv_cbc_decrypt)
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/*
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* aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[],
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* int rounds, int bytes, u8 const iv[])
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* aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[],
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* int rounds, int bytes, u8 const iv[])
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*/
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AES_ENTRY(aes_cbc_cts_encrypt)
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adr_l x8, .Lcts_permute_table
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sub x4, x4, #16
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add x9, x8, #32
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add x8, x8, x4
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sub x9, x9, x4
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ld1 {v3.16b}, [x8]
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ld1 {v4.16b}, [x9]
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ld1 {v0.16b}, [x1], x4 /* overlapping loads */
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ld1 {v1.16b}, [x1]
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ld1 {v5.16b}, [x5] /* get iv */
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enc_prepare w3, x2, x6
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eor v0.16b, v0.16b, v5.16b /* xor with iv */
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tbl v1.16b, {v1.16b}, v4.16b
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encrypt_block v0, w3, x2, x6, w7
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eor v1.16b, v1.16b, v0.16b
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tbl v0.16b, {v0.16b}, v3.16b
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encrypt_block v1, w3, x2, x6, w7
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add x4, x0, x4
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st1 {v0.16b}, [x4] /* overlapping stores */
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st1 {v1.16b}, [x0]
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ret
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AES_ENDPROC(aes_cbc_cts_encrypt)
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AES_ENTRY(aes_cbc_cts_decrypt)
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adr_l x8, .Lcts_permute_table
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sub x4, x4, #16
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add x9, x8, #32
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add x8, x8, x4
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sub x9, x9, x4
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ld1 {v3.16b}, [x8]
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ld1 {v4.16b}, [x9]
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ld1 {v0.16b}, [x1], x4 /* overlapping loads */
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ld1 {v1.16b}, [x1]
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ld1 {v5.16b}, [x5] /* get iv */
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dec_prepare w3, x2, x6
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decrypt_block v0, w3, x2, x6, w7
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tbl v2.16b, {v0.16b}, v3.16b
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eor v2.16b, v2.16b, v1.16b
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tbx v0.16b, {v1.16b}, v4.16b
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decrypt_block v0, w3, x2, x6, w7
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eor v0.16b, v0.16b, v5.16b /* xor with iv */
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add x4, x0, x4
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st1 {v2.16b}, [x4] /* overlapping stores */
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st1 {v0.16b}, [x0]
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ret
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AES_ENDPROC(aes_cbc_cts_decrypt)
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.section ".rodata", "a"
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.align 6
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.Lcts_permute_table:
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.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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.byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
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.byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf
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.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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.previous
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/*
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* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, u8 ctr[])
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*/
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AES_ENTRY(aes_ctr_encrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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enc_prepare w3, x2, x6
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ld1 {vctr.16b}, [x5]
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umov x6, vctr.d[1] /* keep swabbed ctr in reg */
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rev x6, x6
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cmn w6, w4 /* 32 bit overflow? */
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bcs .Lctrloop
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.LctrloopNx:
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subs w4, w4, #MAX_STRIDE
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bmi .Lctr1x
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add w7, w6, #1
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mov v0.16b, vctr.16b
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add w8, w6, #2
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mov v1.16b, vctr.16b
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add w9, w6, #3
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mov v2.16b, vctr.16b
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add w9, w6, #3
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rev w7, w7
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mov v3.16b, vctr.16b
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rev w8, w8
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ST5( mov v4.16b, vctr.16b )
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mov v1.s[3], w7
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rev w9, w9
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ST5( add w10, w6, #4 )
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mov v2.s[3], w8
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ST5( rev w10, w10 )
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mov v3.s[3], w9
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ST5( mov v4.s[3], w10 )
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ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
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ST4( bl aes_encrypt_block4x )
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ST5( bl aes_encrypt_block5x )
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eor v0.16b, v5.16b, v0.16b
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ST4( ld1 {v5.16b}, [x1], #16 )
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eor v1.16b, v6.16b, v1.16b
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ST5( ld1 {v5.16b-v6.16b}, [x1], #32 )
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eor v2.16b, v7.16b, v2.16b
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eor v3.16b, v5.16b, v3.16b
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ST5( eor v4.16b, v6.16b, v4.16b )
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st1 {v0.16b-v3.16b}, [x0], #64
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ST5( st1 {v4.16b}, [x0], #16 )
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add x6, x6, #MAX_STRIDE
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rev x7, x6
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ins vctr.d[1], x7
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cbz w4, .Lctrout
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b .LctrloopNx
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.Lctr1x:
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adds w4, w4, #MAX_STRIDE
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beq .Lctrout
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.Lctrloop:
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mov v0.16b, vctr.16b
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encrypt_block v0, w3, x2, x8, w7
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adds x6, x6, #1 /* increment BE ctr */
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rev x7, x6
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ins vctr.d[1], x7
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bcs .Lctrcarry /* overflow? */
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.Lctrcarrydone:
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subs w4, w4, #1
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bmi .Lctrtailblock /* blocks <0 means tail block */
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ld1 {v3.16b}, [x1], #16
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eor v3.16b, v0.16b, v3.16b
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st1 {v3.16b}, [x0], #16
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bne .Lctrloop
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.Lctrout:
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st1 {vctr.16b}, [x5] /* return next CTR value */
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ldp x29, x30, [sp], #16
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ret
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.Lctrtailblock:
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st1 {v0.16b}, [x0]
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b .Lctrout
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.Lctrcarry:
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umov x7, vctr.d[0] /* load upper word of ctr */
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rev x7, x7 /* ... to handle the carry */
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add x7, x7, #1
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rev x7, x7
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ins vctr.d[0], x7
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b .Lctrcarrydone
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AES_ENDPROC(aes_ctr_encrypt)
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/*
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* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
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* int bytes, u8 const rk2[], u8 iv[], int first)
|
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* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
|
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* int bytes, u8 const rk2[], u8 iv[], int first)
|
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*/
|
|
|
|
.macro next_tweak, out, in, tmp
|
|
sshr \tmp\().2d, \in\().2d, #63
|
|
and \tmp\().16b, \tmp\().16b, xtsmask.16b
|
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add \out\().2d, \in\().2d, \in\().2d
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ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
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eor \out\().16b, \out\().16b, \tmp\().16b
|
|
.endm
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|
|
|
.macro xts_load_mask, tmp
|
|
movi xtsmask.2s, #0x1
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|
movi \tmp\().2s, #0x87
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|
uzp1 xtsmask.4s, xtsmask.4s, \tmp\().4s
|
|
.endm
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|
|
|
AES_ENTRY(aes_xts_encrypt)
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stp x29, x30, [sp, #-16]!
|
|
mov x29, sp
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|
|
|
ld1 {v4.16b}, [x6]
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xts_load_mask v8
|
|
cbz w7, .Lxtsencnotfirst
|
|
|
|
enc_prepare w3, x5, x8
|
|
xts_cts_skip_tw w7, .LxtsencNx
|
|
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
|
|
enc_switch_key w3, x2, x8
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|
b .LxtsencNx
|
|
|
|
.Lxtsencnotfirst:
|
|
enc_prepare w3, x2, x8
|
|
.LxtsencloopNx:
|
|
next_tweak v4, v4, v8
|
|
.LxtsencNx:
|
|
subs w4, w4, #64
|
|
bmi .Lxtsenc1x
|
|
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
|
|
next_tweak v5, v4, v8
|
|
eor v0.16b, v0.16b, v4.16b
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|
next_tweak v6, v5, v8
|
|
eor v1.16b, v1.16b, v5.16b
|
|
eor v2.16b, v2.16b, v6.16b
|
|
next_tweak v7, v6, v8
|
|
eor v3.16b, v3.16b, v7.16b
|
|
bl aes_encrypt_block4x
|
|
eor v3.16b, v3.16b, v7.16b
|
|
eor v0.16b, v0.16b, v4.16b
|
|
eor v1.16b, v1.16b, v5.16b
|
|
eor v2.16b, v2.16b, v6.16b
|
|
st1 {v0.16b-v3.16b}, [x0], #64
|
|
mov v4.16b, v7.16b
|
|
cbz w4, .Lxtsencret
|
|
xts_reload_mask v8
|
|
b .LxtsencloopNx
|
|
.Lxtsenc1x:
|
|
adds w4, w4, #64
|
|
beq .Lxtsencout
|
|
subs w4, w4, #16
|
|
bmi .LxtsencctsNx
|
|
.Lxtsencloop:
|
|
ld1 {v0.16b}, [x1], #16
|
|
.Lxtsencctsout:
|
|
eor v0.16b, v0.16b, v4.16b
|
|
encrypt_block v0, w3, x2, x8, w7
|
|
eor v0.16b, v0.16b, v4.16b
|
|
cbz w4, .Lxtsencout
|
|
subs w4, w4, #16
|
|
next_tweak v4, v4, v8
|
|
bmi .Lxtsenccts
|
|
st1 {v0.16b}, [x0], #16
|
|
b .Lxtsencloop
|
|
.Lxtsencout:
|
|
st1 {v0.16b}, [x0]
|
|
.Lxtsencret:
|
|
st1 {v4.16b}, [x6]
|
|
ldp x29, x30, [sp], #16
|
|
ret
|
|
|
|
.LxtsencctsNx:
|
|
mov v0.16b, v3.16b
|
|
sub x0, x0, #16
|
|
.Lxtsenccts:
|
|
adr_l x8, .Lcts_permute_table
|
|
|
|
add x1, x1, w4, sxtw /* rewind input pointer */
|
|
add w4, w4, #16 /* # bytes in final block */
|
|
add x9, x8, #32
|
|
add x8, x8, x4
|
|
sub x9, x9, x4
|
|
add x4, x0, x4 /* output address of final block */
|
|
|
|
ld1 {v1.16b}, [x1] /* load final block */
|
|
ld1 {v2.16b}, [x8]
|
|
ld1 {v3.16b}, [x9]
|
|
|
|
tbl v2.16b, {v0.16b}, v2.16b
|
|
tbx v0.16b, {v1.16b}, v3.16b
|
|
st1 {v2.16b}, [x4] /* overlapping stores */
|
|
mov w4, wzr
|
|
b .Lxtsencctsout
|
|
AES_ENDPROC(aes_xts_encrypt)
|
|
|
|
AES_ENTRY(aes_xts_decrypt)
|
|
stp x29, x30, [sp, #-16]!
|
|
mov x29, sp
|
|
|
|
/* subtract 16 bytes if we are doing CTS */
|
|
sub w8, w4, #0x10
|
|
tst w4, #0xf
|
|
csel w4, w4, w8, eq
|
|
|
|
ld1 {v4.16b}, [x6]
|
|
xts_load_mask v8
|
|
xts_cts_skip_tw w7, .Lxtsdecskiptw
|
|
cbz w7, .Lxtsdecnotfirst
|
|
|
|
enc_prepare w3, x5, x8
|
|
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
|
|
.Lxtsdecskiptw:
|
|
dec_prepare w3, x2, x8
|
|
b .LxtsdecNx
|
|
|
|
.Lxtsdecnotfirst:
|
|
dec_prepare w3, x2, x8
|
|
.LxtsdecloopNx:
|
|
next_tweak v4, v4, v8
|
|
.LxtsdecNx:
|
|
subs w4, w4, #64
|
|
bmi .Lxtsdec1x
|
|
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
|
|
next_tweak v5, v4, v8
|
|
eor v0.16b, v0.16b, v4.16b
|
|
next_tweak v6, v5, v8
|
|
eor v1.16b, v1.16b, v5.16b
|
|
eor v2.16b, v2.16b, v6.16b
|
|
next_tweak v7, v6, v8
|
|
eor v3.16b, v3.16b, v7.16b
|
|
bl aes_decrypt_block4x
|
|
eor v3.16b, v3.16b, v7.16b
|
|
eor v0.16b, v0.16b, v4.16b
|
|
eor v1.16b, v1.16b, v5.16b
|
|
eor v2.16b, v2.16b, v6.16b
|
|
st1 {v0.16b-v3.16b}, [x0], #64
|
|
mov v4.16b, v7.16b
|
|
cbz w4, .Lxtsdecout
|
|
xts_reload_mask v8
|
|
b .LxtsdecloopNx
|
|
.Lxtsdec1x:
|
|
adds w4, w4, #64
|
|
beq .Lxtsdecout
|
|
subs w4, w4, #16
|
|
.Lxtsdecloop:
|
|
ld1 {v0.16b}, [x1], #16
|
|
bmi .Lxtsdeccts
|
|
.Lxtsdecctsout:
|
|
eor v0.16b, v0.16b, v4.16b
|
|
decrypt_block v0, w3, x2, x8, w7
|
|
eor v0.16b, v0.16b, v4.16b
|
|
st1 {v0.16b}, [x0], #16
|
|
cbz w4, .Lxtsdecout
|
|
subs w4, w4, #16
|
|
next_tweak v4, v4, v8
|
|
b .Lxtsdecloop
|
|
.Lxtsdecout:
|
|
st1 {v4.16b}, [x6]
|
|
ldp x29, x30, [sp], #16
|
|
ret
|
|
|
|
.Lxtsdeccts:
|
|
adr_l x8, .Lcts_permute_table
|
|
|
|
add x1, x1, w4, sxtw /* rewind input pointer */
|
|
add w4, w4, #16 /* # bytes in final block */
|
|
add x9, x8, #32
|
|
add x8, x8, x4
|
|
sub x9, x9, x4
|
|
add x4, x0, x4 /* output address of final block */
|
|
|
|
next_tweak v5, v4, v8
|
|
|
|
ld1 {v1.16b}, [x1] /* load final block */
|
|
ld1 {v2.16b}, [x8]
|
|
ld1 {v3.16b}, [x9]
|
|
|
|
eor v0.16b, v0.16b, v5.16b
|
|
decrypt_block v0, w3, x2, x8, w7
|
|
eor v0.16b, v0.16b, v5.16b
|
|
|
|
tbl v2.16b, {v0.16b}, v2.16b
|
|
tbx v0.16b, {v1.16b}, v3.16b
|
|
|
|
st1 {v2.16b}, [x4] /* overlapping stores */
|
|
mov w4, wzr
|
|
b .Lxtsdecctsout
|
|
AES_ENDPROC(aes_xts_decrypt)
|
|
|
|
/*
|
|
* aes_mac_update(u8 const in[], u32 const rk[], int rounds,
|
|
* int blocks, u8 dg[], int enc_before, int enc_after)
|
|
*/
|
|
AES_ENTRY(aes_mac_update)
|
|
frame_push 6
|
|
|
|
mov x19, x0
|
|
mov x20, x1
|
|
mov x21, x2
|
|
mov x22, x3
|
|
mov x23, x4
|
|
mov x24, x6
|
|
|
|
ld1 {v0.16b}, [x23] /* get dg */
|
|
enc_prepare w2, x1, x7
|
|
cbz w5, .Lmacloop4x
|
|
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
|
|
.Lmacloop4x:
|
|
subs w22, w22, #4
|
|
bmi .Lmac1x
|
|
ld1 {v1.16b-v4.16b}, [x19], #64 /* get next pt block */
|
|
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
|
|
encrypt_block v0, w21, x20, x7, w8
|
|
eor v0.16b, v0.16b, v2.16b
|
|
encrypt_block v0, w21, x20, x7, w8
|
|
eor v0.16b, v0.16b, v3.16b
|
|
encrypt_block v0, w21, x20, x7, w8
|
|
eor v0.16b, v0.16b, v4.16b
|
|
cmp w22, wzr
|
|
csinv x5, x24, xzr, eq
|
|
cbz w5, .Lmacout
|
|
encrypt_block v0, w21, x20, x7, w8
|
|
st1 {v0.16b}, [x23] /* return dg */
|
|
cond_yield_neon .Lmacrestart
|
|
b .Lmacloop4x
|
|
.Lmac1x:
|
|
add w22, w22, #4
|
|
.Lmacloop:
|
|
cbz w22, .Lmacout
|
|
ld1 {v1.16b}, [x19], #16 /* get next pt block */
|
|
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
|
|
|
|
subs w22, w22, #1
|
|
csinv x5, x24, xzr, eq
|
|
cbz w5, .Lmacout
|
|
|
|
.Lmacenc:
|
|
encrypt_block v0, w21, x20, x7, w8
|
|
b .Lmacloop
|
|
|
|
.Lmacout:
|
|
st1 {v0.16b}, [x23] /* return dg */
|
|
frame_pop
|
|
ret
|
|
|
|
.Lmacrestart:
|
|
ld1 {v0.16b}, [x23] /* get dg */
|
|
enc_prepare w21, x20, x0
|
|
b .Lmacloop4x
|
|
AES_ENDPROC(aes_mac_update)
|