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crypto: arm - AES in ECB/CBC/CTR/XTS modes using ARMv8 Crypto Extensions
This implements the ECB, CBC, CTR and XTS asynchronous block ciphers using the AArch32 versions of the ARMv8 Crypto Extensions for AES. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
006d0624fa
commit
86464859cc
@ -101,4 +101,13 @@ config CRYPTO_AES_ARM_BS
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This implementation does not rely on any lookup tables so it is
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believed to be invulnerable to cache timing attacks.
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config CRYPTO_AES_ARM_CE
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tristate "Accelerated AES using ARMv8 Crypto Extensions"
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depends on KERNEL_MODE_NEON
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select CRYPTO_ALGAPI
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select CRYPTO_ABLK_HELPER
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help
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Use an implementation of AES in CBC, CTR and XTS modes that uses
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ARMv8 Crypto Extensions
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endif
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@ -4,6 +4,7 @@
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obj-$(CONFIG_CRYPTO_AES_ARM) += aes-arm.o
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obj-$(CONFIG_CRYPTO_AES_ARM_BS) += aes-arm-bs.o
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obj-$(CONFIG_CRYPTO_AES_ARM_CE) += aes-arm-ce.o
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obj-$(CONFIG_CRYPTO_SHA1_ARM) += sha1-arm.o
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obj-$(CONFIG_CRYPTO_SHA1_ARM_NEON) += sha1-arm-neon.o
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obj-$(CONFIG_CRYPTO_SHA512_ARM_NEON) += sha512-arm-neon.o
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@ -17,6 +18,7 @@ sha1-arm-neon-y := sha1-armv7-neon.o sha1_neon_glue.o
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sha512-arm-neon-y := sha512-armv7-neon.o sha512_neon_glue.o
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sha1-arm-ce-y := sha1-ce-core.o sha1-ce-glue.o
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sha2-arm-ce-y := sha2-ce-core.o sha2-ce-glue.o
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aes-arm-ce-y := aes-ce-core.o aes-ce-glue.o
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quiet_cmd_perl = PERL $@
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cmd_perl = $(PERL) $(<) > $(@)
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518
arch/arm/crypto/aes-ce-core.S
Normal file
518
arch/arm/crypto/aes-ce-core.S
Normal file
@ -0,0 +1,518 @@
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/*
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* aes-ce-core.S - AES in CBC/CTR/XTS mode using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2015 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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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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.fpu crypto-neon-fp-armv8
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.align 3
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.macro enc_round, state, key
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aese.8 \state, \key
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aesmc.8 \state, \state
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.endm
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.macro dec_round, state, key
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aesd.8 \state, \key
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aesimc.8 \state, \state
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.endm
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.macro enc_dround, key1, key2
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enc_round q0, \key1
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enc_round q0, \key2
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.endm
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.macro dec_dround, key1, key2
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dec_round q0, \key1
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dec_round q0, \key2
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.endm
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.macro enc_fround, key1, key2, key3
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enc_round q0, \key1
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aese.8 q0, \key2
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veor q0, q0, \key3
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.endm
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.macro dec_fround, key1, key2, key3
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dec_round q0, \key1
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aesd.8 q0, \key2
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veor q0, q0, \key3
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.endm
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.macro enc_dround_3x, key1, key2
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enc_round q0, \key1
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enc_round q1, \key1
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enc_round q2, \key1
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enc_round q0, \key2
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enc_round q1, \key2
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enc_round q2, \key2
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.endm
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.macro dec_dround_3x, key1, key2
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dec_round q0, \key1
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dec_round q1, \key1
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dec_round q2, \key1
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dec_round q0, \key2
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dec_round q1, \key2
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dec_round q2, \key2
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.endm
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.macro enc_fround_3x, key1, key2, key3
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enc_round q0, \key1
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enc_round q1, \key1
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enc_round q2, \key1
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aese.8 q0, \key2
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aese.8 q1, \key2
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aese.8 q2, \key2
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veor q0, q0, \key3
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veor q1, q1, \key3
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veor q2, q2, \key3
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.endm
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.macro dec_fround_3x, key1, key2, key3
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dec_round q0, \key1
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dec_round q1, \key1
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dec_round q2, \key1
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aesd.8 q0, \key2
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aesd.8 q1, \key2
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aesd.8 q2, \key2
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veor q0, q0, \key3
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veor q1, q1, \key3
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veor q2, q2, \key3
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.endm
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.macro do_block, dround, fround
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cmp r3, #12 @ which key size?
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vld1.8 {q10-q11}, [ip]!
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\dround q8, q9
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vld1.8 {q12-q13}, [ip]!
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\dround q10, q11
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vld1.8 {q10-q11}, [ip]!
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\dround q12, q13
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vld1.8 {q12-q13}, [ip]!
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\dround q10, q11
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blo 0f @ AES-128: 10 rounds
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vld1.8 {q10-q11}, [ip]!
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beq 1f @ AES-192: 12 rounds
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\dround q12, q13
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vld1.8 {q12-q13}, [ip]
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\dround q10, q11
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0: \fround q12, q13, q14
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bx lr
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1: \dround q12, q13
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\fround q10, q11, q14
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bx lr
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.endm
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/*
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* Internal, non-AAPCS compliant functions that implement the core AES
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* transforms. These should preserve all registers except q0 - q2 and ip
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* Arguments:
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* q0 : first in/output block
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* q1 : second in/output block (_3x version only)
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* q2 : third in/output block (_3x version only)
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* q8 : first round key
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* q9 : secound round key
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* ip : address of 3rd round key
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* q14 : final round key
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* r3 : number of rounds
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*/
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.align 6
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aes_encrypt:
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add ip, r2, #32 @ 3rd round key
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.Laes_encrypt_tweak:
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do_block enc_dround, enc_fround
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ENDPROC(aes_encrypt)
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.align 6
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aes_decrypt:
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add ip, r2, #32 @ 3rd round key
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do_block dec_dround, dec_fround
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ENDPROC(aes_decrypt)
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.align 6
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aes_encrypt_3x:
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add ip, r2, #32 @ 3rd round key
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do_block enc_dround_3x, enc_fround_3x
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ENDPROC(aes_encrypt_3x)
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.align 6
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aes_decrypt_3x:
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add ip, r2, #32 @ 3rd round key
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do_block dec_dround_3x, dec_fround_3x
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ENDPROC(aes_decrypt_3x)
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.macro prepare_key, rk, rounds
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add ip, \rk, \rounds, lsl #4
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vld1.8 {q8-q9}, [\rk] @ load first 2 round keys
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vld1.8 {q14}, [ip] @ load last round key
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.endm
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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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ENTRY(ce_aes_ecb_encrypt)
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push {r4, lr}
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ldr r4, [sp, #8]
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prepare_key r2, r3
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.Lecbencloop3x:
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subs r4, r4, #3
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bmi .Lecbenc1x
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vld1.8 {q0-q1}, [r1, :64]!
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vld1.8 {q2}, [r1, :64]!
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bl aes_encrypt_3x
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vst1.8 {q0-q1}, [r0, :64]!
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vst1.8 {q2}, [r0, :64]!
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b .Lecbencloop3x
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.Lecbenc1x:
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adds r4, r4, #3
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beq .Lecbencout
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.Lecbencloop:
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vld1.8 {q0}, [r1, :64]!
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bl aes_encrypt
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vst1.8 {q0}, [r0, :64]!
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subs r4, r4, #1
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bne .Lecbencloop
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.Lecbencout:
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pop {r4, pc}
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ENDPROC(ce_aes_ecb_encrypt)
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ENTRY(ce_aes_ecb_decrypt)
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push {r4, lr}
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ldr r4, [sp, #8]
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prepare_key r2, r3
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.Lecbdecloop3x:
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subs r4, r4, #3
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bmi .Lecbdec1x
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vld1.8 {q0-q1}, [r1, :64]!
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vld1.8 {q2}, [r1, :64]!
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bl aes_decrypt_3x
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vst1.8 {q0-q1}, [r0, :64]!
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vst1.8 {q2}, [r0, :64]!
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b .Lecbdecloop3x
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.Lecbdec1x:
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adds r4, r4, #3
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beq .Lecbdecout
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.Lecbdecloop:
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vld1.8 {q0}, [r1, :64]!
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bl aes_decrypt
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vst1.8 {q0}, [r0, :64]!
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subs r4, r4, #1
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bne .Lecbdecloop
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.Lecbdecout:
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pop {r4, pc}
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ENDPROC(ce_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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ENTRY(ce_aes_cbc_encrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q0}, [r5]
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prepare_key r2, r3
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.Lcbcencloop:
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vld1.8 {q1}, [r1, :64]! @ get next pt block
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veor q0, q0, q1 @ ..and xor with iv
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bl aes_encrypt
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vst1.8 {q0}, [r0, :64]!
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subs r4, r4, #1
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bne .Lcbcencloop
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vst1.8 {q0}, [r5]
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pop {r4-r6, pc}
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ENDPROC(ce_aes_cbc_encrypt)
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ENTRY(ce_aes_cbc_decrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q6}, [r5] @ keep iv in q6
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prepare_key r2, r3
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.Lcbcdecloop3x:
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subs r4, r4, #3
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bmi .Lcbcdec1x
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vld1.8 {q0-q1}, [r1, :64]!
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vld1.8 {q2}, [r1, :64]!
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vmov q3, q0
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vmov q4, q1
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vmov q5, q2
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bl aes_decrypt_3x
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veor q0, q0, q6
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veor q1, q1, q3
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veor q2, q2, q4
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vmov q6, q5
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vst1.8 {q0-q1}, [r0, :64]!
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vst1.8 {q2}, [r0, :64]!
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b .Lcbcdecloop3x
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.Lcbcdec1x:
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adds r4, r4, #3
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beq .Lcbcdecout
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vmov q15, q14 @ preserve last round key
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.Lcbcdecloop:
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vld1.8 {q0}, [r1, :64]! @ get next ct block
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veor q14, q15, q6 @ combine prev ct with last key
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vmov q6, q0
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bl aes_decrypt
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vst1.8 {q0}, [r0, :64]!
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subs r4, r4, #1
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bne .Lcbcdecloop
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.Lcbcdecout:
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vst1.8 {q6}, [r5] @ keep iv in q6
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pop {r4-r6, pc}
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ENDPROC(ce_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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ENTRY(ce_aes_ctr_encrypt)
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push {r4-r6, lr}
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ldrd r4, r5, [sp, #16]
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vld1.8 {q6}, [r5] @ load ctr
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prepare_key r2, r3
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vmov r6, s27 @ keep swabbed ctr in r6
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rev r6, r6
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cmn r6, r4 @ 32 bit overflow?
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bcs .Lctrloop
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.Lctrloop3x:
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subs r4, r4, #3
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bmi .Lctr1x
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add r6, r6, #1
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vmov q0, q6
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vmov q1, q6
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rev ip, r6
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add r6, r6, #1
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vmov q2, q6
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vmov s7, ip
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rev ip, r6
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add r6, r6, #1
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vmov s11, ip
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vld1.8 {q3-q4}, [r1, :64]!
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vld1.8 {q5}, [r1, :64]!
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bl aes_encrypt_3x
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veor q0, q0, q3
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veor q1, q1, q4
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veor q2, q2, q5
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rev ip, r6
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vst1.8 {q0-q1}, [r0, :64]!
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vst1.8 {q2}, [r0, :64]!
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vmov s27, ip
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b .Lctrloop3x
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.Lctr1x:
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adds r4, r4, #3
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beq .Lctrout
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.Lctrloop:
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vmov q0, q6
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bl aes_encrypt
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subs r4, r4, #1
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bmi .Lctrhalfblock @ blocks < 0 means 1/2 block
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vld1.8 {q3}, [r1, :64]!
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veor q3, q0, q3
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vst1.8 {q3}, [r0, :64]!
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adds r6, r6, #1 @ increment BE ctr
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rev ip, r6
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vmov s27, ip
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bcs .Lctrcarry
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teq r4, #0
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bne .Lctrloop
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.Lctrout:
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vst1.8 {q6}, [r5]
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pop {r4-r6, pc}
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.Lctrhalfblock:
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vld1.8 {d1}, [r1, :64]
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veor d0, d0, d1
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vst1.8 {d0}, [r0, :64]
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pop {r4-r6, pc}
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.Lctrcarry:
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.irp sreg, s26, s25, s24
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vmov ip, \sreg @ load next word of ctr
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rev ip, ip @ ... to handle the carry
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adds ip, ip, #1
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rev ip, ip
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vmov \sreg, ip
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bcc 0f
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.endr
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0: teq r4, #0
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beq .Lctrout
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b .Lctrloop
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ENDPROC(ce_aes_ctr_encrypt)
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/*
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* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
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* int blocks, u8 iv[], u8 const rk2[], 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 iv[], u8 const rk2[], int first)
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*/
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.macro next_tweak, out, in, const, tmp
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vshr.s64 \tmp, \in, #63
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vand \tmp, \tmp, \const
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vadd.u64 \out, \in, \in
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vext.8 \tmp, \tmp, \tmp, #8
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veor \out, \out, \tmp
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.endm
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.align 3
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.Lxts_mul_x:
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.quad 1, 0x87
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ce_aes_xts_init:
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vldr d14, .Lxts_mul_x
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vldr d15, .Lxts_mul_x + 8
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ldrd r4, r5, [sp, #16] @ load args
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ldr r6, [sp, #28]
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vld1.8 {q0}, [r5] @ load iv
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teq r6, #1 @ start of a block?
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bxne lr
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@ Encrypt the IV in q0 with the second AES key. This should only
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@ be done at the start of a block.
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ldr r6, [sp, #24] @ load AES key 2
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prepare_key r6, r3
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add ip, r6, #32 @ 3rd round key of key 2
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b .Laes_encrypt_tweak @ tail call
|
||||
ENDPROC(ce_aes_xts_init)
|
||||
|
||||
ENTRY(ce_aes_xts_encrypt)
|
||||
push {r4-r6, lr}
|
||||
|
||||
bl ce_aes_xts_init @ run shared prologue
|
||||
prepare_key r2, r3
|
||||
vmov q3, q0
|
||||
|
||||
teq r6, #0 @ start of a block?
|
||||
bne .Lxtsenc3x
|
||||
|
||||
.Lxtsencloop3x:
|
||||
next_tweak q3, q3, q7, q6
|
||||
.Lxtsenc3x:
|
||||
subs r4, r4, #3
|
||||
bmi .Lxtsenc1x
|
||||
vld1.8 {q0-q1}, [r1, :64]! @ get 3 pt blocks
|
||||
vld1.8 {q2}, [r1, :64]!
|
||||
next_tweak q4, q3, q7, q6
|
||||
veor q0, q0, q3
|
||||
next_tweak q5, q4, q7, q6
|
||||
veor q1, q1, q4
|
||||
veor q2, q2, q5
|
||||
bl aes_encrypt_3x
|
||||
veor q0, q0, q3
|
||||
veor q1, q1, q4
|
||||
veor q2, q2, q5
|
||||
vst1.8 {q0-q1}, [r0, :64]! @ write 3 ct blocks
|
||||
vst1.8 {q2}, [r0, :64]!
|
||||
vmov q3, q5
|
||||
teq r4, #0
|
||||
beq .Lxtsencout
|
||||
b .Lxtsencloop3x
|
||||
.Lxtsenc1x:
|
||||
adds r4, r4, #3
|
||||
beq .Lxtsencout
|
||||
.Lxtsencloop:
|
||||
vld1.8 {q0}, [r1, :64]!
|
||||
veor q0, q0, q3
|
||||
bl aes_encrypt
|
||||
veor q0, q0, q3
|
||||
vst1.8 {q0}, [r0, :64]!
|
||||
subs r4, r4, #1
|
||||
beq .Lxtsencout
|
||||
next_tweak q3, q3, q7, q6
|
||||
b .Lxtsencloop
|
||||
.Lxtsencout:
|
||||
vst1.8 {q3}, [r5]
|
||||
pop {r4-r6, pc}
|
||||
ENDPROC(ce_aes_xts_encrypt)
|
||||
|
||||
|
||||
ENTRY(ce_aes_xts_decrypt)
|
||||
push {r4-r6, lr}
|
||||
|
||||
bl ce_aes_xts_init @ run shared prologue
|
||||
prepare_key r2, r3
|
||||
vmov q3, q0
|
||||
|
||||
teq r6, #0 @ start of a block?
|
||||
bne .Lxtsdec3x
|
||||
|
||||
.Lxtsdecloop3x:
|
||||
next_tweak q3, q3, q7, q6
|
||||
.Lxtsdec3x:
|
||||
subs r4, r4, #3
|
||||
bmi .Lxtsdec1x
|
||||
vld1.8 {q0-q1}, [r1, :64]! @ get 3 ct blocks
|
||||
vld1.8 {q2}, [r1, :64]!
|
||||
next_tweak q4, q3, q7, q6
|
||||
veor q0, q0, q3
|
||||
next_tweak q5, q4, q7, q6
|
||||
veor q1, q1, q4
|
||||
veor q2, q2, q5
|
||||
bl aes_decrypt_3x
|
||||
veor q0, q0, q3
|
||||
veor q1, q1, q4
|
||||
veor q2, q2, q5
|
||||
vst1.8 {q0-q1}, [r0, :64]! @ write 3 pt blocks
|
||||
vst1.8 {q2}, [r0, :64]!
|
||||
vmov q3, q5
|
||||
teq r4, #0
|
||||
beq .Lxtsdecout
|
||||
b .Lxtsdecloop3x
|
||||
.Lxtsdec1x:
|
||||
adds r4, r4, #3
|
||||
beq .Lxtsdecout
|
||||
.Lxtsdecloop:
|
||||
vld1.8 {q0}, [r1, :64]!
|
||||
veor q0, q0, q3
|
||||
add ip, r2, #32 @ 3rd round key
|
||||
bl aes_decrypt
|
||||
veor q0, q0, q3
|
||||
vst1.8 {q0}, [r0, :64]!
|
||||
subs r4, r4, #1
|
||||
beq .Lxtsdecout
|
||||
next_tweak q3, q3, q7, q6
|
||||
b .Lxtsdecloop
|
||||
.Lxtsdecout:
|
||||
vst1.8 {q3}, [r5]
|
||||
pop {r4-r6, pc}
|
||||
ENDPROC(ce_aes_xts_decrypt)
|
||||
|
||||
/*
|
||||
* u32 ce_aes_sub(u32 input) - use the aese instruction to perform the
|
||||
* AES sbox substitution on each byte in
|
||||
* 'input'
|
||||
*/
|
||||
ENTRY(ce_aes_sub)
|
||||
vdup.32 q1, r0
|
||||
veor q0, q0, q0
|
||||
aese.8 q0, q1
|
||||
vmov r0, s0
|
||||
bx lr
|
||||
ENDPROC(ce_aes_sub)
|
||||
|
||||
/*
|
||||
* void ce_aes_invert(u8 *dst, u8 *src) - perform the Inverse MixColumns
|
||||
* operation on round key *src
|
||||
*/
|
||||
ENTRY(ce_aes_invert)
|
||||
vld1.8 {q0}, [r1]
|
||||
aesimc.8 q0, q0
|
||||
vst1.8 {q0}, [r0]
|
||||
bx lr
|
||||
ENDPROC(ce_aes_invert)
|
||||
520
arch/arm/crypto/aes-ce-glue.c
Normal file
520
arch/arm/crypto/aes-ce-glue.c
Normal file
@ -0,0 +1,520 @@
|
||||
/*
|
||||
* aes-ce-glue.c - wrapper code for ARMv8 AES
|
||||
*
|
||||
* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <asm/hwcap.h>
|
||||
#include <asm/neon.h>
|
||||
#include <asm/hwcap.h>
|
||||
#include <crypto/aes.h>
|
||||
#include <crypto/ablk_helper.h>
|
||||
#include <crypto/algapi.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
|
||||
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
||||
/* defined in aes-ce-core.S */
|
||||
asmlinkage u32 ce_aes_sub(u32 input);
|
||||
asmlinkage void ce_aes_invert(void *dst, void *src);
|
||||
|
||||
asmlinkage void ce_aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
|
||||
int rounds, int blocks);
|
||||
asmlinkage void ce_aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
|
||||
int rounds, int blocks);
|
||||
|
||||
asmlinkage void ce_aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
|
||||
int rounds, int blocks, u8 iv[]);
|
||||
asmlinkage void ce_aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
|
||||
int rounds, int blocks, u8 iv[]);
|
||||
|
||||
asmlinkage void ce_aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
|
||||
int rounds, int blocks, u8 ctr[]);
|
||||
|
||||
asmlinkage void ce_aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
|
||||
int rounds, int blocks, u8 iv[],
|
||||
u8 const rk2[], int first);
|
||||
asmlinkage void ce_aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
|
||||
int rounds, int blocks, u8 iv[],
|
||||
u8 const rk2[], int first);
|
||||
|
||||
struct aes_block {
|
||||
u8 b[AES_BLOCK_SIZE];
|
||||
};
|
||||
|
||||
static int num_rounds(struct crypto_aes_ctx *ctx)
|
||||
{
|
||||
/*
|
||||
* # of rounds specified by AES:
|
||||
* 128 bit key 10 rounds
|
||||
* 192 bit key 12 rounds
|
||||
* 256 bit key 14 rounds
|
||||
* => n byte key => 6 + (n/4) rounds
|
||||
*/
|
||||
return 6 + ctx->key_length / 4;
|
||||
}
|
||||
|
||||
static int ce_aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
/*
|
||||
* The AES key schedule round constants
|
||||
*/
|
||||
static u8 const rcon[] = {
|
||||
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
|
||||
};
|
||||
|
||||
u32 kwords = key_len / sizeof(u32);
|
||||
struct aes_block *key_enc, *key_dec;
|
||||
int i, j;
|
||||
|
||||
if (key_len != AES_KEYSIZE_128 &&
|
||||
key_len != AES_KEYSIZE_192 &&
|
||||
key_len != AES_KEYSIZE_256)
|
||||
return -EINVAL;
|
||||
|
||||
memcpy(ctx->key_enc, in_key, key_len);
|
||||
ctx->key_length = key_len;
|
||||
|
||||
kernel_neon_begin();
|
||||
for (i = 0; i < sizeof(rcon); i++) {
|
||||
u32 *rki = ctx->key_enc + (i * kwords);
|
||||
u32 *rko = rki + kwords;
|
||||
|
||||
rko[0] = ror32(ce_aes_sub(rki[kwords - 1]), 8);
|
||||
rko[0] = rko[0] ^ rki[0] ^ rcon[i];
|
||||
rko[1] = rko[0] ^ rki[1];
|
||||
rko[2] = rko[1] ^ rki[2];
|
||||
rko[3] = rko[2] ^ rki[3];
|
||||
|
||||
if (key_len == AES_KEYSIZE_192) {
|
||||
if (i >= 7)
|
||||
break;
|
||||
rko[4] = rko[3] ^ rki[4];
|
||||
rko[5] = rko[4] ^ rki[5];
|
||||
} else if (key_len == AES_KEYSIZE_256) {
|
||||
if (i >= 6)
|
||||
break;
|
||||
rko[4] = ce_aes_sub(rko[3]) ^ rki[4];
|
||||
rko[5] = rko[4] ^ rki[5];
|
||||
rko[6] = rko[5] ^ rki[6];
|
||||
rko[7] = rko[6] ^ rki[7];
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Generate the decryption keys for the Equivalent Inverse Cipher.
|
||||
* This involves reversing the order of the round keys, and applying
|
||||
* the Inverse Mix Columns transformation on all but the first and
|
||||
* the last one.
|
||||
*/
|
||||
key_enc = (struct aes_block *)ctx->key_enc;
|
||||
key_dec = (struct aes_block *)ctx->key_dec;
|
||||
j = num_rounds(ctx);
|
||||
|
||||
key_dec[0] = key_enc[j];
|
||||
for (i = 1, j--; j > 0; i++, j--)
|
||||
ce_aes_invert(key_dec + i, key_enc + j);
|
||||
key_dec[i] = key_enc[0];
|
||||
|
||||
kernel_neon_end();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ce_aes_setkey(struct crypto_tfm *tfm, const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
int ret;
|
||||
|
||||
ret = ce_aes_expandkey(ctx, in_key, key_len);
|
||||
if (!ret)
|
||||
return 0;
|
||||
|
||||
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
struct crypto_aes_xts_ctx {
|
||||
struct crypto_aes_ctx key1;
|
||||
struct crypto_aes_ctx __aligned(8) key2;
|
||||
};
|
||||
|
||||
static int xts_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
struct crypto_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
int ret;
|
||||
|
||||
ret = ce_aes_expandkey(&ctx->key1, in_key, key_len / 2);
|
||||
if (!ret)
|
||||
ret = ce_aes_expandkey(&ctx->key2, &in_key[key_len / 2],
|
||||
key_len / 2);
|
||||
if (!ret)
|
||||
return 0;
|
||||
|
||||
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
int err;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
|
||||
ce_aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key_enc, num_rounds(ctx), blocks);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
int err;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
|
||||
ce_aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key_dec, num_rounds(ctx), blocks);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
int err;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
|
||||
ce_aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key_enc, num_rounds(ctx), blocks,
|
||||
walk.iv);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
int err;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
|
||||
ce_aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key_dec, num_rounds(ctx), blocks,
|
||||
walk.iv);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ctr_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
struct blkcipher_walk walk;
|
||||
int err, blocks;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
|
||||
|
||||
kernel_neon_begin();
|
||||
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
|
||||
ce_aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key_enc, num_rounds(ctx), blocks,
|
||||
walk.iv);
|
||||
nbytes -= blocks * AES_BLOCK_SIZE;
|
||||
if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE)
|
||||
break;
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
if (nbytes) {
|
||||
u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
|
||||
u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
|
||||
u8 __aligned(8) tail[AES_BLOCK_SIZE];
|
||||
|
||||
/*
|
||||
* Minimum alignment is 8 bytes, so if nbytes is <= 8, we need
|
||||
* to tell aes_ctr_encrypt() to only read half a block.
|
||||
*/
|
||||
blocks = (nbytes <= 8) ? -1 : 1;
|
||||
|
||||
ce_aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc,
|
||||
num_rounds(ctx), blocks, walk.iv);
|
||||
memcpy(tdst, tail, nbytes);
|
||||
err = blkcipher_walk_done(desc, &walk, 0);
|
||||
}
|
||||
kernel_neon_end();
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
int err, first, rounds = num_rounds(&ctx->key1);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
|
||||
ce_aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key1.key_enc, rounds, blocks,
|
||||
walk.iv, (u8 *)ctx->key2.key_enc, first);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
||||
struct scatterlist *src, unsigned int nbytes)
|
||||
{
|
||||
struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
||||
int err, first, rounds = num_rounds(&ctx->key1);
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
|
||||
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
|
||||
kernel_neon_begin();
|
||||
for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
|
||||
ce_aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
(u8 *)ctx->key1.key_dec, rounds, blocks,
|
||||
walk.iv, (u8 *)ctx->key2.key_enc, first);
|
||||
err = blkcipher_walk_done(desc, &walk,
|
||||
walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
kernel_neon_end();
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct crypto_alg aes_algs[] = { {
|
||||
.cra_name = "__ecb-aes-ce",
|
||||
.cra_driver_name = "__driver-ecb-aes-ce",
|
||||
.cra_priority = 0,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_blkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_blkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ce_aes_setkey,
|
||||
.encrypt = ecb_encrypt,
|
||||
.decrypt = ecb_decrypt,
|
||||
},
|
||||
}, {
|
||||
.cra_name = "__cbc-aes-ce",
|
||||
.cra_driver_name = "__driver-cbc-aes-ce",
|
||||
.cra_priority = 0,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_blkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_blkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ce_aes_setkey,
|
||||
.encrypt = cbc_encrypt,
|
||||
.decrypt = cbc_decrypt,
|
||||
},
|
||||
}, {
|
||||
.cra_name = "__ctr-aes-ce",
|
||||
.cra_driver_name = "__driver-ctr-aes-ce",
|
||||
.cra_priority = 0,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_blkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_blkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ce_aes_setkey,
|
||||
.encrypt = ctr_encrypt,
|
||||
.decrypt = ctr_encrypt,
|
||||
},
|
||||
}, {
|
||||
.cra_name = "__xts-aes-ce",
|
||||
.cra_driver_name = "__driver-xts-aes-ce",
|
||||
.cra_priority = 0,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_blkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_blkcipher = {
|
||||
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||||
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = xts_set_key,
|
||||
.encrypt = xts_encrypt,
|
||||
.decrypt = xts_decrypt,
|
||||
},
|
||||
}, {
|
||||
.cra_name = "ecb(aes)",
|
||||
.cra_driver_name = "ecb-aes-ce",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_ablkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_init = ablk_init,
|
||||
.cra_exit = ablk_exit,
|
||||
.cra_ablkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ablk_set_key,
|
||||
.encrypt = ablk_encrypt,
|
||||
.decrypt = ablk_decrypt,
|
||||
}
|
||||
}, {
|
||||
.cra_name = "cbc(aes)",
|
||||
.cra_driver_name = "cbc-aes-ce",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_ablkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_init = ablk_init,
|
||||
.cra_exit = ablk_exit,
|
||||
.cra_ablkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ablk_set_key,
|
||||
.encrypt = ablk_encrypt,
|
||||
.decrypt = ablk_decrypt,
|
||||
}
|
||||
}, {
|
||||
.cra_name = "ctr(aes)",
|
||||
.cra_driver_name = "ctr-aes-ce",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_ablkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_init = ablk_init,
|
||||
.cra_exit = ablk_exit,
|
||||
.cra_ablkcipher = {
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ablk_set_key,
|
||||
.encrypt = ablk_encrypt,
|
||||
.decrypt = ablk_decrypt,
|
||||
}
|
||||
}, {
|
||||
.cra_name = "xts(aes)",
|
||||
.cra_driver_name = "xts-aes-ce",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||||
.cra_blocksize = AES_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_ablkcipher_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_init = ablk_init,
|
||||
.cra_exit = ablk_exit,
|
||||
.cra_ablkcipher = {
|
||||
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||||
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = ablk_set_key,
|
||||
.encrypt = ablk_encrypt,
|
||||
.decrypt = ablk_decrypt,
|
||||
}
|
||||
} };
|
||||
|
||||
static int __init aes_init(void)
|
||||
{
|
||||
if (!(elf_hwcap2 & HWCAP2_AES))
|
||||
return -ENODEV;
|
||||
return crypto_register_algs(aes_algs, ARRAY_SIZE(aes_algs));
|
||||
}
|
||||
|
||||
static void __exit aes_exit(void)
|
||||
{
|
||||
crypto_unregister_algs(aes_algs, ARRAY_SIZE(aes_algs));
|
||||
}
|
||||
|
||||
module_init(aes_init);
|
||||
module_exit(aes_exit);
|
||||
Loading…
Reference in New Issue
Block a user