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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4860620da7
On ARMv8 implementations that do not support the Crypto Extensions, such as the Raspberry Pi 3, the CCM driver falls back to the generic table based AES implementation to perform the MAC part of the algorithm, which is slow and not time invariant. So add a CBCMAC implementation to the shared glue code between NEON AES and Crypto Extensions AES, so that it can be used instead now that the CCM driver has been updated to look for CBCMAC implementations other than the one it supplies itself. Also, given how these algorithms mostly only differ in the way the key handling and the final encryption are implemented, expose CMAC and XCBC algorithms as well based on the same core update code. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
554 lines
12 KiB
ArmAsm
554 lines
12 KiB
ArmAsm
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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/*
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* There are several ways to instantiate this code:
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* - no interleave, all inline
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* - 2-way interleave, 2x calls out of line (-DINTERLEAVE=2)
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* - 2-way interleave, all inline (-DINTERLEAVE=2 -DINTERLEAVE_INLINE)
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* - 4-way interleave, 4x calls out of line (-DINTERLEAVE=4)
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* - 4-way interleave, all inline (-DINTERLEAVE=4 -DINTERLEAVE_INLINE)
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*
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* Macros imported by this code:
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* - enc_prepare - setup NEON registers for encryption
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* - dec_prepare - setup NEON registers for decryption
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* - enc_switch_key - change to new key after having prepared for encryption
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* - encrypt_block - encrypt a single block
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* - decrypt block - decrypt a single block
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* - encrypt_block2x - encrypt 2 blocks in parallel (if INTERLEAVE == 2)
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* - decrypt_block2x - decrypt 2 blocks in parallel (if INTERLEAVE == 2)
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* - encrypt_block4x - encrypt 4 blocks in parallel (if INTERLEAVE == 4)
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* - decrypt_block4x - decrypt 4 blocks in parallel (if INTERLEAVE == 4)
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*/
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#if defined(INTERLEAVE) && !defined(INTERLEAVE_INLINE)
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#define FRAME_PUSH stp x29, x30, [sp,#-16]! ; mov x29, sp
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#define FRAME_POP ldp x29, x30, [sp],#16
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#if INTERLEAVE == 2
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aes_encrypt_block2x:
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encrypt_block2x v0, v1, w3, x2, x6, w7
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ret
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ENDPROC(aes_encrypt_block2x)
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aes_decrypt_block2x:
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decrypt_block2x v0, v1, w3, x2, x6, w7
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ret
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ENDPROC(aes_decrypt_block2x)
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#elif INTERLEAVE == 4
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aes_encrypt_block4x:
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encrypt_block4x v0, v1, v2, v3, w3, x2, x6, 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, x6, w7
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ret
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ENDPROC(aes_decrypt_block4x)
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#else
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#error INTERLEAVE should equal 2 or 4
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#endif
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.macro do_encrypt_block2x
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bl aes_encrypt_block2x
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.endm
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.macro do_decrypt_block2x
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bl aes_decrypt_block2x
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.endm
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.macro do_encrypt_block4x
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bl aes_encrypt_block4x
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.endm
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.macro do_decrypt_block4x
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bl aes_decrypt_block4x
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.endm
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#else
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#define FRAME_PUSH
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#define FRAME_POP
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.macro do_encrypt_block2x
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encrypt_block2x v0, v1, w3, x2, x6, w7
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.endm
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.macro do_decrypt_block2x
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decrypt_block2x v0, v1, w3, x2, x6, w7
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.endm
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.macro do_encrypt_block4x
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encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
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.endm
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.macro do_decrypt_block4x
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decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
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.endm
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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, int first)
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* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
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* int blocks, int first)
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*/
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AES_ENTRY(aes_ecb_encrypt)
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FRAME_PUSH
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cbz w5, .LecbencloopNx
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enc_prepare w3, x2, x5
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.LecbencloopNx:
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#if INTERLEAVE >= 2
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subs w4, w4, #INTERLEAVE
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bmi .Lecbenc1x
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#if INTERLEAVE == 2
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ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
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do_encrypt_block2x
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st1 {v0.16b-v1.16b}, [x0], #32
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#else
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
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do_encrypt_block4x
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st1 {v0.16b-v3.16b}, [x0], #64
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#endif
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b .LecbencloopNx
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.Lecbenc1x:
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adds w4, w4, #INTERLEAVE
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beq .Lecbencout
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#endif
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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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FRAME_POP
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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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FRAME_PUSH
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cbz w5, .LecbdecloopNx
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dec_prepare w3, x2, x5
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.LecbdecloopNx:
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#if INTERLEAVE >= 2
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subs w4, w4, #INTERLEAVE
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bmi .Lecbdec1x
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#if INTERLEAVE == 2
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ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
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do_decrypt_block2x
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st1 {v0.16b-v1.16b}, [x0], #32
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#else
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
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do_decrypt_block4x
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st1 {v0.16b-v3.16b}, [x0], #64
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#endif
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b .LecbdecloopNx
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.Lecbdec1x:
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adds w4, w4, #INTERLEAVE
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beq .Lecbdecout
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#endif
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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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FRAME_POP
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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[], int first)
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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[], int first)
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*/
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AES_ENTRY(aes_cbc_encrypt)
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cbz w6, .Lcbcencloop
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ld1 {v0.16b}, [x5] /* get iv */
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enc_prepare w3, x2, x6
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.Lcbcencloop:
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ld1 {v1.16b}, [x1], #16 /* get next pt block */
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eor v0.16b, v0.16b, v1.16b /* ..and xor with iv */
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encrypt_block v0, w3, x2, x6, w7
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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bne .Lcbcencloop
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st1 {v0.16b}, [x5] /* return iv */
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ret
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AES_ENDPROC(aes_cbc_encrypt)
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AES_ENTRY(aes_cbc_decrypt)
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FRAME_PUSH
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cbz w6, .LcbcdecloopNx
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ld1 {v7.16b}, [x5] /* get iv */
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dec_prepare w3, x2, x6
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.LcbcdecloopNx:
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#if INTERLEAVE >= 2
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subs w4, w4, #INTERLEAVE
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bmi .Lcbcdec1x
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#if INTERLEAVE == 2
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ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
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mov v2.16b, v0.16b
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mov v3.16b, v1.16b
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do_decrypt_block2x
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eor v0.16b, v0.16b, v7.16b
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eor v1.16b, v1.16b, v2.16b
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mov v7.16b, v3.16b
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st1 {v0.16b-v1.16b}, [x0], #32
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#else
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
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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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do_decrypt_block4x
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sub x1, x1, #16
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eor v0.16b, v0.16b, v7.16b
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eor v1.16b, v1.16b, v4.16b
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ld1 {v7.16b}, [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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st1 {v0.16b-v3.16b}, [x0], #64
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#endif
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b .LcbcdecloopNx
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.Lcbcdec1x:
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adds w4, w4, #INTERLEAVE
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beq .Lcbcdecout
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#endif
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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, v7.16b /* xor with iv => pt */
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mov v7.16b, 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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FRAME_POP
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st1 {v7.16b}, [x5] /* return iv */
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ret
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AES_ENDPROC(aes_cbc_decrypt)
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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[], int first)
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*/
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AES_ENTRY(aes_ctr_encrypt)
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FRAME_PUSH
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cbz w6, .Lctrnotfirst /* 1st time around? */
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enc_prepare w3, x2, x6
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ld1 {v4.16b}, [x5]
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.Lctrnotfirst:
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umov x8, v4.d[1] /* keep swabbed ctr in reg */
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rev x8, x8
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#if INTERLEAVE >= 2
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cmn w8, w4 /* 32 bit overflow? */
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bcs .Lctrloop
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.LctrloopNx:
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subs w4, w4, #INTERLEAVE
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bmi .Lctr1x
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#if INTERLEAVE == 2
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mov v0.8b, v4.8b
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mov v1.8b, v4.8b
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rev x7, x8
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add x8, x8, #1
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ins v0.d[1], x7
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rev x7, x8
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add x8, x8, #1
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ins v1.d[1], x7
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ld1 {v2.16b-v3.16b}, [x1], #32 /* get 2 input blocks */
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do_encrypt_block2x
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eor v0.16b, v0.16b, v2.16b
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eor v1.16b, v1.16b, v3.16b
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st1 {v0.16b-v1.16b}, [x0], #32
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#else
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ldr q8, =0x30000000200000001 /* addends 1,2,3[,0] */
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dup v7.4s, w8
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mov v0.16b, v4.16b
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add v7.4s, v7.4s, v8.4s
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mov v1.16b, v4.16b
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rev32 v8.16b, v7.16b
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mov v2.16b, v4.16b
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mov v3.16b, v4.16b
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mov v1.s[3], v8.s[0]
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mov v2.s[3], v8.s[1]
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mov v3.s[3], v8.s[2]
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ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
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do_encrypt_block4x
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eor v0.16b, v5.16b, v0.16b
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ld1 {v5.16b}, [x1], #16 /* get 1 input block */
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eor v1.16b, v6.16b, v1.16b
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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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st1 {v0.16b-v3.16b}, [x0], #64
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add x8, x8, #INTERLEAVE
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#endif
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rev x7, x8
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ins v4.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, #INTERLEAVE
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beq .Lctrout
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#endif
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.Lctrloop:
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mov v0.16b, v4.16b
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encrypt_block v0, w3, x2, x6, w7
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adds x8, x8, #1 /* increment BE ctr */
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rev x7, x8
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ins v4.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 {v4.16b}, [x5] /* return next CTR value */
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FRAME_POP
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ret
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.Lctrtailblock:
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st1 {v0.16b}, [x0]
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FRAME_POP
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ret
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.Lctrcarry:
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umov x7, v4.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 v4.d[0], x7
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b .Lctrcarrydone
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AES_ENDPROC(aes_ctr_encrypt)
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.ltorg
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/*
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* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
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* int blocks, 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 blocks, u8 const rk2[], u8 iv[], int first)
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*/
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.macro next_tweak, out, in, const, tmp
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sshr \tmp\().2d, \in\().2d, #63
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and \tmp\().16b, \tmp\().16b, \const\().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
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.endm
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.Lxts_mul_x:
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CPU_LE( .quad 1, 0x87 )
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CPU_BE( .quad 0x87, 1 )
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AES_ENTRY(aes_xts_encrypt)
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FRAME_PUSH
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cbz w7, .LxtsencloopNx
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ld1 {v4.16b}, [x6]
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enc_prepare w3, x5, x6
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encrypt_block v4, w3, x5, x6, w7 /* first tweak */
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enc_switch_key w3, x2, x6
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ldr q7, .Lxts_mul_x
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b .LxtsencNx
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.LxtsencloopNx:
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ldr q7, .Lxts_mul_x
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next_tweak v4, v4, v7, v8
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.LxtsencNx:
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#if INTERLEAVE >= 2
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subs w4, w4, #INTERLEAVE
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bmi .Lxtsenc1x
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#if INTERLEAVE == 2
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ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
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next_tweak v5, v4, v7, v8
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eor v0.16b, v0.16b, v4.16b
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eor v1.16b, v1.16b, v5.16b
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do_encrypt_block2x
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eor v0.16b, v0.16b, v4.16b
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eor v1.16b, v1.16b, v5.16b
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st1 {v0.16b-v1.16b}, [x0], #32
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cbz w4, .LxtsencoutNx
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next_tweak v4, v5, v7, v8
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b .LxtsencNx
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.LxtsencoutNx:
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mov v4.16b, v5.16b
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b .Lxtsencout
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#else
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
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next_tweak v5, v4, v7, v8
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eor v0.16b, v0.16b, v4.16b
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next_tweak v6, v5, v7, v8
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eor v1.16b, v1.16b, v5.16b
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eor v2.16b, v2.16b, v6.16b
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next_tweak v7, v6, v7, v8
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eor v3.16b, v3.16b, v7.16b
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do_encrypt_block4x
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eor v3.16b, v3.16b, v7.16b
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eor v0.16b, v0.16b, v4.16b
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eor v1.16b, v1.16b, v5.16b
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eor v2.16b, v2.16b, v6.16b
|
|
st1 {v0.16b-v3.16b}, [x0], #64
|
|
mov v4.16b, v7.16b
|
|
cbz w4, .Lxtsencout
|
|
b .LxtsencloopNx
|
|
#endif
|
|
.Lxtsenc1x:
|
|
adds w4, w4, #INTERLEAVE
|
|
beq .Lxtsencout
|
|
#endif
|
|
.Lxtsencloop:
|
|
ld1 {v1.16b}, [x1], #16
|
|
eor v0.16b, v1.16b, v4.16b
|
|
encrypt_block v0, w3, x2, x6, w7
|
|
eor v0.16b, v0.16b, v4.16b
|
|
st1 {v0.16b}, [x0], #16
|
|
subs w4, w4, #1
|
|
beq .Lxtsencout
|
|
next_tweak v4, v4, v7, v8
|
|
b .Lxtsencloop
|
|
.Lxtsencout:
|
|
FRAME_POP
|
|
ret
|
|
AES_ENDPROC(aes_xts_encrypt)
|
|
|
|
|
|
AES_ENTRY(aes_xts_decrypt)
|
|
FRAME_PUSH
|
|
cbz w7, .LxtsdecloopNx
|
|
|
|
ld1 {v4.16b}, [x6]
|
|
enc_prepare w3, x5, x6
|
|
encrypt_block v4, w3, x5, x6, w7 /* first tweak */
|
|
dec_prepare w3, x2, x6
|
|
ldr q7, .Lxts_mul_x
|
|
b .LxtsdecNx
|
|
|
|
.LxtsdecloopNx:
|
|
ldr q7, .Lxts_mul_x
|
|
next_tweak v4, v4, v7, v8
|
|
.LxtsdecNx:
|
|
#if INTERLEAVE >= 2
|
|
subs w4, w4, #INTERLEAVE
|
|
bmi .Lxtsdec1x
|
|
#if INTERLEAVE == 2
|
|
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
|
|
next_tweak v5, v4, v7, v8
|
|
eor v0.16b, v0.16b, v4.16b
|
|
eor v1.16b, v1.16b, v5.16b
|
|
do_decrypt_block2x
|
|
eor v0.16b, v0.16b, v4.16b
|
|
eor v1.16b, v1.16b, v5.16b
|
|
st1 {v0.16b-v1.16b}, [x0], #32
|
|
cbz w4, .LxtsdecoutNx
|
|
next_tweak v4, v5, v7, v8
|
|
b .LxtsdecNx
|
|
.LxtsdecoutNx:
|
|
mov v4.16b, v5.16b
|
|
b .Lxtsdecout
|
|
#else
|
|
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
|
|
next_tweak v5, v4, v7, v8
|
|
eor v0.16b, v0.16b, v4.16b
|
|
next_tweak v6, v5, v7, v8
|
|
eor v1.16b, v1.16b, v5.16b
|
|
eor v2.16b, v2.16b, v6.16b
|
|
next_tweak v7, v6, v7, v8
|
|
eor v3.16b, v3.16b, v7.16b
|
|
do_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
|
|
b .LxtsdecloopNx
|
|
#endif
|
|
.Lxtsdec1x:
|
|
adds w4, w4, #INTERLEAVE
|
|
beq .Lxtsdecout
|
|
#endif
|
|
.Lxtsdecloop:
|
|
ld1 {v1.16b}, [x1], #16
|
|
eor v0.16b, v1.16b, v4.16b
|
|
decrypt_block v0, w3, x2, x6, w7
|
|
eor v0.16b, v0.16b, v4.16b
|
|
st1 {v0.16b}, [x0], #16
|
|
subs w4, w4, #1
|
|
beq .Lxtsdecout
|
|
next_tweak v4, v4, v7, v8
|
|
b .Lxtsdecloop
|
|
.Lxtsdecout:
|
|
FRAME_POP
|
|
ret
|
|
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)
|
|
ld1 {v0.16b}, [x4] /* get dg */
|
|
enc_prepare w2, x1, x7
|
|
cbnz w5, .Lmacenc
|
|
|
|
.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 */
|
|
ret
|
|
AES_ENDPROC(aes_mac_update)
|