8daa399ede
Instead of falling back to C code to do a memcpy of the output of the last block, handle this in the asm code directly if possible, which is the case if the entire input is longer than 16 bytes. Cc: Nathan Huckleberry <nhuck@google.com> Cc: Eric Biggers <ebiggers@google.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
734 lines
17 KiB
ArmAsm
734 lines
17 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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SYM_FUNC_START_LOCAL(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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SYM_FUNC_END(aes_encrypt_block4x)
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SYM_FUNC_START_LOCAL(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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SYM_FUNC_END(aes_decrypt_block4x)
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#if MAX_STRIDE == 5
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SYM_FUNC_START_LOCAL(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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SYM_FUNC_END(aes_encrypt_block5x)
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SYM_FUNC_START_LOCAL(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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SYM_FUNC_END(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_FUNC_START(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_FUNC_END(aes_ecb_encrypt)
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AES_FUNC_START(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_FUNC_END(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_FUNC_START(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_FUNC_START(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_FUNC_END(aes_cbc_encrypt)
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AES_FUNC_END(aes_essiv_cbc_encrypt)
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AES_FUNC_START(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_FUNC_START(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_FUNC_END(aes_cbc_decrypt)
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AES_FUNC_END(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_FUNC_START(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_FUNC_END(aes_cbc_cts_encrypt)
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AES_FUNC_START(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_FUNC_END(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 bytes, u8 ctr[])
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*/
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AES_FUNC_START(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, x12
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ld1 {vctr.16b}, [x5]
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umov x12, vctr.d[1] /* keep swabbed ctr in reg */
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rev x12, x12
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.LctrloopNx:
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add w7, w4, #15
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sub w4, w4, #MAX_STRIDE << 4
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lsr w7, w7, #4
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mov w8, #MAX_STRIDE
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cmp w7, w8
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csel w7, w7, w8, lt
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adds x12, x12, x7
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mov v0.16b, vctr.16b
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mov v1.16b, vctr.16b
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mov v2.16b, vctr.16b
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mov v3.16b, vctr.16b
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ST5( mov v4.16b, vctr.16b )
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bcs 0f
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.subsection 1
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/* apply carry to outgoing counter */
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0: umov x8, vctr.d[0]
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rev x8, x8
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add x8, x8, #1
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rev x8, x8
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ins vctr.d[0], x8
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/* apply carry to N counter blocks for N := x12 */
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cbz x12, 2f
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adr x16, 1f
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sub x16, x16, x12, lsl #3
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br x16
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bti c
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mov v0.d[0], vctr.d[0]
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bti c
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mov v1.d[0], vctr.d[0]
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bti c
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mov v2.d[0], vctr.d[0]
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bti c
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mov v3.d[0], vctr.d[0]
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ST5( bti c )
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ST5( mov v4.d[0], vctr.d[0] )
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1: b 2f
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.previous
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2: rev x7, x12
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ins vctr.d[1], x7
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sub x7, x12, #MAX_STRIDE - 1
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sub x8, x12, #MAX_STRIDE - 2
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sub x9, x12, #MAX_STRIDE - 3
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rev x7, x7
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rev x8, x8
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mov v1.d[1], x7
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rev x9, x9
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ST5( sub x10, x12, #MAX_STRIDE - 4 )
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mov v2.d[1], x8
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ST5( rev x10, x10 )
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mov v3.d[1], x9
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ST5( mov v4.d[1], x10 )
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tbnz w4, #31, .Lctrtail
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ld1 {v5.16b-v7.16b}, [x1], #48
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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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cbz w4, .Lctrout
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b .LctrloopNx
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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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.Lctrtail:
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/* XOR up to MAX_STRIDE * 16 - 1 bytes of in/output with v0 ... v3/v4 */
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mov x16, #16
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ands x6, x4, #0xf
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csel x13, x6, x16, ne
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ST5( cmp w4, #64 - (MAX_STRIDE << 4) )
|
|
ST5( csel x14, x16, xzr, gt )
|
|
cmp w4, #48 - (MAX_STRIDE << 4)
|
|
csel x15, x16, xzr, gt
|
|
cmp w4, #32 - (MAX_STRIDE << 4)
|
|
csel x16, x16, xzr, gt
|
|
cmp w4, #16 - (MAX_STRIDE << 4)
|
|
|
|
adr_l x12, .Lcts_permute_table
|
|
add x12, x12, x13
|
|
ble .Lctrtail1x
|
|
|
|
ST5( ld1 {v5.16b}, [x1], x14 )
|
|
ld1 {v6.16b}, [x1], x15
|
|
ld1 {v7.16b}, [x1], x16
|
|
|
|
ST4( bl aes_encrypt_block4x )
|
|
ST5( bl aes_encrypt_block5x )
|
|
|
|
ld1 {v8.16b}, [x1], x13
|
|
ld1 {v9.16b}, [x1]
|
|
ld1 {v10.16b}, [x12]
|
|
|
|
ST4( eor v6.16b, v6.16b, v0.16b )
|
|
ST4( eor v7.16b, v7.16b, v1.16b )
|
|
ST4( tbl v3.16b, {v3.16b}, v10.16b )
|
|
ST4( eor v8.16b, v8.16b, v2.16b )
|
|
ST4( eor v9.16b, v9.16b, v3.16b )
|
|
|
|
ST5( eor v5.16b, v5.16b, v0.16b )
|
|
ST5( eor v6.16b, v6.16b, v1.16b )
|
|
ST5( tbl v4.16b, {v4.16b}, v10.16b )
|
|
ST5( eor v7.16b, v7.16b, v2.16b )
|
|
ST5( eor v8.16b, v8.16b, v3.16b )
|
|
ST5( eor v9.16b, v9.16b, v4.16b )
|
|
|
|
ST5( st1 {v5.16b}, [x0], x14 )
|
|
st1 {v6.16b}, [x0], x15
|
|
st1 {v7.16b}, [x0], x16
|
|
add x13, x13, x0
|
|
st1 {v9.16b}, [x13] // overlapping stores
|
|
st1 {v8.16b}, [x0]
|
|
b .Lctrout
|
|
|
|
.Lctrtail1x:
|
|
sub x7, x6, #16
|
|
csel x6, x6, x7, eq
|
|
add x1, x1, x6
|
|
add x0, x0, x6
|
|
ld1 {v5.16b}, [x1]
|
|
ld1 {v6.16b}, [x0]
|
|
ST5( mov v3.16b, v4.16b )
|
|
encrypt_block v3, w3, x2, x8, w7
|
|
ld1 {v10.16b-v11.16b}, [x12]
|
|
tbl v3.16b, {v3.16b}, v10.16b
|
|
sshr v11.16b, v11.16b, #7
|
|
eor v5.16b, v5.16b, v3.16b
|
|
bif v5.16b, v6.16b, v11.16b
|
|
st1 {v5.16b}, [x0]
|
|
b .Lctrout
|
|
AES_FUNC_END(aes_ctr_encrypt)
|
|
|
|
|
|
/*
|
|
* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
|
|
* int bytes, u8 const rk2[], u8 iv[], int first)
|
|
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
|
|
* int bytes, u8 const rk2[], u8 iv[], int first)
|
|
*/
|
|
|
|
.macro next_tweak, out, in, tmp
|
|
sshr \tmp\().2d, \in\().2d, #63
|
|
and \tmp\().16b, \tmp\().16b, xtsmask.16b
|
|
add \out\().2d, \in\().2d, \in\().2d
|
|
ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
|
|
eor \out\().16b, \out\().16b, \tmp\().16b
|
|
.endm
|
|
|
|
.macro xts_load_mask, tmp
|
|
movi xtsmask.2s, #0x1
|
|
movi \tmp\().2s, #0x87
|
|
uzp1 xtsmask.4s, xtsmask.4s, \tmp\().4s
|
|
.endm
|
|
|
|
AES_FUNC_START(aes_xts_encrypt)
|
|
stp x29, x30, [sp, #-16]!
|
|
mov x29, sp
|
|
|
|
ld1 {v4.16b}, [x6]
|
|
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
|
|
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
|
|
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_FUNC_END(aes_xts_encrypt)
|
|
|
|
AES_FUNC_START(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_FUNC_END(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_FUNC_START(aes_mac_update)
|
|
ld1 {v0.16b}, [x4] /* get dg */
|
|
enc_prepare w2, x1, x7
|
|
cbz w5, .Lmacloop4x
|
|
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
|
|
.Lmacloop4x:
|
|
subs w3, w3, #4
|
|
bmi .Lmac1x
|
|
ld1 {v1.16b-v4.16b}, [x0], #64 /* get next pt block */
|
|
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
eor v0.16b, v0.16b, v2.16b
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
eor v0.16b, v0.16b, v3.16b
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
eor v0.16b, v0.16b, v4.16b
|
|
cmp w3, wzr
|
|
csinv x5, x6, xzr, eq
|
|
cbz w5, .Lmacout
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
st1 {v0.16b}, [x4] /* return dg */
|
|
cond_yield .Lmacout, x7, x8
|
|
b .Lmacloop4x
|
|
.Lmac1x:
|
|
add w3, w3, #4
|
|
.Lmacloop:
|
|
cbz w3, .Lmacout
|
|
ld1 {v1.16b}, [x0], #16 /* get next pt block */
|
|
eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
|
|
|
|
subs w3, w3, #1
|
|
csinv x5, x6, xzr, eq
|
|
cbz w5, .Lmacout
|
|
|
|
.Lmacenc:
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
b .Lmacloop
|
|
|
|
.Lmacout:
|
|
st1 {v0.16b}, [x4] /* return dg */
|
|
mov w0, w3
|
|
ret
|
|
AES_FUNC_END(aes_mac_update)
|