mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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870c163a0e
CBC MAC is strictly sequential, and so the current AES code simply processes the input one block at a time. However, we are about to add yield support, which adds a bit of overhead, and which we prefer to align with other modes in terms of granularity (i.e., it is better to have all routines yield every 64 bytes and not have an exception for CBC MAC which yields every 16 bytes) So unroll the loop by 4. We still cannot perform the AES algorithm in parallel, but we can at least merge the loads and stores. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
435 lines
9.9 KiB
ArmAsm
435 lines
9.9 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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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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/*
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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, #4
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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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bl aes_encrypt_block4x
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st1 {v0.16b-v3.16b}, [x0], #64
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b .LecbencloopNx
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.Lecbenc1x:
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adds w4, w4, #4
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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, #4
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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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bl aes_decrypt_block4x
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st1 {v0.16b-v3.16b}, [x0], #64
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b .LecbdecloopNx
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.Lecbdec1x:
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adds w4, w4, #4
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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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*/
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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_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 {v7.16b}, [x5] /* get iv */
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dec_prepare w3, x2, x6
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.LcbcdecloopNx:
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subs w4, w4, #4
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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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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, 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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b .LcbcdecloopNx
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.Lcbcdec1x:
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adds w4, w4, #4
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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, 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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st1 {v7.16b}, [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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/*
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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 {v4.16b}, [x5]
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umov x6, v4.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, #4
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bmi .Lctr1x
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ldr q8, =0x30000000200000001 /* addends 1,2,3[,0] */
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dup v7.4s, w6
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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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bl aes_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 x6, x6, #4
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rev x7, x6
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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, #4
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beq .Lctrout
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.Lctrloop:
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mov v0.16b, v4.16b
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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 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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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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ldp x29, x30, [sp], #16
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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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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ld1 {v4.16b}, [x6]
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cbz w7, .Lxtsencnotfirst
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enc_prepare w3, x5, x8
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encrypt_block v4, w3, x5, x8, w7 /* first tweak */
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enc_switch_key w3, x2, x8
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ldr q7, .Lxts_mul_x
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b .LxtsencNx
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.Lxtsencnotfirst:
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enc_prepare w3, x2, x8
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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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subs w4, w4, #4
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bmi .Lxtsenc1x
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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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bl aes_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
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st1 {v0.16b-v3.16b}, [x0], #64
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mov v4.16b, v7.16b
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cbz w4, .Lxtsencout
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b .LxtsencloopNx
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.Lxtsenc1x:
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adds w4, w4, #4
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beq .Lxtsencout
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.Lxtsencloop:
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ld1 {v1.16b}, [x1], #16
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eor v0.16b, v1.16b, v4.16b
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encrypt_block v0, w3, x2, x8, w7
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eor v0.16b, v0.16b, v4.16b
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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beq .Lxtsencout
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next_tweak v4, v4, v7, v8
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b .Lxtsencloop
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.Lxtsencout:
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st1 {v4.16b}, [x6]
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ldp x29, x30, [sp], #16
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ret
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AES_ENDPROC(aes_xts_encrypt)
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AES_ENTRY(aes_xts_decrypt)
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ld1 {v4.16b}, [x6]
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cbz w7, .Lxtsdecnotfirst
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enc_prepare w3, x5, x8
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encrypt_block v4, w3, x5, x8, w7 /* first tweak */
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dec_prepare w3, x2, x8
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ldr q7, .Lxts_mul_x
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b .LxtsdecNx
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.Lxtsdecnotfirst:
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dec_prepare w3, x2, x8
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.LxtsdecloopNx:
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ldr q7, .Lxts_mul_x
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next_tweak v4, v4, v7, v8
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.LxtsdecNx:
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subs w4, w4, #4
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bmi .Lxtsdec1x
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ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct 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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bl aes_decrypt_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
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st1 {v0.16b-v3.16b}, [x0], #64
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mov v4.16b, v7.16b
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cbz w4, .Lxtsdecout
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b .LxtsdecloopNx
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.Lxtsdec1x:
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adds w4, w4, #4
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beq .Lxtsdecout
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.Lxtsdecloop:
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ld1 {v1.16b}, [x1], #16
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eor v0.16b, v1.16b, v4.16b
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decrypt_block v0, w3, x2, x8, w7
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eor v0.16b, v0.16b, v4.16b
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st1 {v0.16b}, [x0], #16
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subs w4, w4, #1
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beq .Lxtsdecout
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next_tweak v4, v4, v7, v8
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b .Lxtsdecloop
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.Lxtsdecout:
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st1 {v4.16b}, [x6]
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ldp x29, x30, [sp], #16
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ret
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AES_ENDPROC(aes_xts_decrypt)
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/*
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* aes_mac_update(u8 const in[], u32 const rk[], int rounds,
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* int blocks, u8 dg[], int enc_before, int enc_after)
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*/
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AES_ENTRY(aes_mac_update)
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ld1 {v0.16b}, [x4] /* get dg */
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enc_prepare w2, x1, x7
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cbz w5, .Lmacloop4x
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encrypt_block v0, w2, x1, x7, w8
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.Lmacloop4x:
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subs w3, w3, #4
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bmi .Lmac1x
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ld1 {v1.16b-v4.16b}, [x0], #64 /* get next pt block */
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eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */
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encrypt_block v0, w2, x1, x7, w8
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eor v0.16b, v0.16b, v2.16b
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encrypt_block v0, w2, x1, x7, w8
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eor v0.16b, v0.16b, v3.16b
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encrypt_block v0, w2, x1, x7, w8
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eor v0.16b, v0.16b, v4.16b
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cmp w3, wzr
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csinv x5, x6, xzr, eq
|
|
cbz w5, .Lmacout
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
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
|
|
|
|
encrypt_block v0, w2, x1, x7, w8
|
|
b .Lmacloop
|
|
|
|
.Lmacout:
|
|
st1 {v0.16b}, [x4] /* return dg */
|
|
ret
|
|
AES_ENDPROC(aes_mac_update)
|