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 2015-03-10 09:47:47 +01:00 committed by Herbert Xu
parent 006d0624fa
commit 86464859cc
4 changed files with 1049 additions and 0 deletions

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@ -101,4 +101,13 @@ config CRYPTO_AES_ARM_BS
This implementation does not rely on any lookup tables so it is
believed to be invulnerable to cache timing attacks.
config CRYPTO_AES_ARM_CE
tristate "Accelerated AES using ARMv8 Crypto Extensions"
depends on KERNEL_MODE_NEON
select CRYPTO_ALGAPI
select CRYPTO_ABLK_HELPER
help
Use an implementation of AES in CBC, CTR and XTS modes that uses
ARMv8 Crypto Extensions
endif

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@ -4,6 +4,7 @@
obj-$(CONFIG_CRYPTO_AES_ARM) += aes-arm.o
obj-$(CONFIG_CRYPTO_AES_ARM_BS) += aes-arm-bs.o
obj-$(CONFIG_CRYPTO_AES_ARM_CE) += aes-arm-ce.o
obj-$(CONFIG_CRYPTO_SHA1_ARM) += sha1-arm.o
obj-$(CONFIG_CRYPTO_SHA1_ARM_NEON) += sha1-arm-neon.o
obj-$(CONFIG_CRYPTO_SHA512_ARM_NEON) += sha512-arm-neon.o
@ -17,6 +18,7 @@ sha1-arm-neon-y := sha1-armv7-neon.o sha1_neon_glue.o
sha512-arm-neon-y := sha512-armv7-neon.o sha512_neon_glue.o
sha1-arm-ce-y := sha1-ce-core.o sha1-ce-glue.o
sha2-arm-ce-y := sha2-ce-core.o sha2-ce-glue.o
aes-arm-ce-y := aes-ce-core.o aes-ce-glue.o
quiet_cmd_perl = PERL $@
cmd_perl = $(PERL) $(<) > $(@)

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@ -0,0 +1,518 @@
/*
* aes-ce-core.S - AES in CBC/CTR/XTS mode using ARMv8 Crypto Extensions
*
* 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 <linux/linkage.h>
#include <asm/assembler.h>
.text
.fpu crypto-neon-fp-armv8
.align 3
.macro enc_round, state, key
aese.8 \state, \key
aesmc.8 \state, \state
.endm
.macro dec_round, state, key
aesd.8 \state, \key
aesimc.8 \state, \state
.endm
.macro enc_dround, key1, key2
enc_round q0, \key1
enc_round q0, \key2
.endm
.macro dec_dround, key1, key2
dec_round q0, \key1
dec_round q0, \key2
.endm
.macro enc_fround, key1, key2, key3
enc_round q0, \key1
aese.8 q0, \key2
veor q0, q0, \key3
.endm
.macro dec_fround, key1, key2, key3
dec_round q0, \key1
aesd.8 q0, \key2
veor q0, q0, \key3
.endm
.macro enc_dround_3x, key1, key2
enc_round q0, \key1
enc_round q1, \key1
enc_round q2, \key1
enc_round q0, \key2
enc_round q1, \key2
enc_round q2, \key2
.endm
.macro dec_dround_3x, key1, key2
dec_round q0, \key1
dec_round q1, \key1
dec_round q2, \key1
dec_round q0, \key2
dec_round q1, \key2
dec_round q2, \key2
.endm
.macro enc_fround_3x, key1, key2, key3
enc_round q0, \key1
enc_round q1, \key1
enc_round q2, \key1
aese.8 q0, \key2
aese.8 q1, \key2
aese.8 q2, \key2
veor q0, q0, \key3
veor q1, q1, \key3
veor q2, q2, \key3
.endm
.macro dec_fround_3x, key1, key2, key3
dec_round q0, \key1
dec_round q1, \key1
dec_round q2, \key1
aesd.8 q0, \key2
aesd.8 q1, \key2
aesd.8 q2, \key2
veor q0, q0, \key3
veor q1, q1, \key3
veor q2, q2, \key3
.endm
.macro do_block, dround, fround
cmp r3, #12 @ which key size?
vld1.8 {q10-q11}, [ip]!
\dround q8, q9
vld1.8 {q12-q13}, [ip]!
\dround q10, q11
vld1.8 {q10-q11}, [ip]!
\dround q12, q13
vld1.8 {q12-q13}, [ip]!
\dround q10, q11
blo 0f @ AES-128: 10 rounds
vld1.8 {q10-q11}, [ip]!
beq 1f @ AES-192: 12 rounds
\dround q12, q13
vld1.8 {q12-q13}, [ip]
\dround q10, q11
0: \fround q12, q13, q14
bx lr
1: \dround q12, q13
\fround q10, q11, q14
bx lr
.endm
/*
* Internal, non-AAPCS compliant functions that implement the core AES
* transforms. These should preserve all registers except q0 - q2 and ip
* Arguments:
* q0 : first in/output block
* q1 : second in/output block (_3x version only)
* q2 : third in/output block (_3x version only)
* q8 : first round key
* q9 : secound round key
* ip : address of 3rd round key
* q14 : final round key
* r3 : number of rounds
*/
.align 6
aes_encrypt:
add ip, r2, #32 @ 3rd round key
.Laes_encrypt_tweak:
do_block enc_dround, enc_fround
ENDPROC(aes_encrypt)
.align 6
aes_decrypt:
add ip, r2, #32 @ 3rd round key
do_block dec_dround, dec_fround
ENDPROC(aes_decrypt)
.align 6
aes_encrypt_3x:
add ip, r2, #32 @ 3rd round key
do_block enc_dround_3x, enc_fround_3x
ENDPROC(aes_encrypt_3x)
.align 6
aes_decrypt_3x:
add ip, r2, #32 @ 3rd round key
do_block dec_dround_3x, dec_fround_3x
ENDPROC(aes_decrypt_3x)
.macro prepare_key, rk, rounds
add ip, \rk, \rounds, lsl #4
vld1.8 {q8-q9}, [\rk] @ load first 2 round keys
vld1.8 {q14}, [ip] @ load last round key
.endm
/*
* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
*/
ENTRY(ce_aes_ecb_encrypt)
push {r4, lr}
ldr r4, [sp, #8]
prepare_key r2, r3
.Lecbencloop3x:
subs r4, r4, #3
bmi .Lecbenc1x
vld1.8 {q0-q1}, [r1, :64]!
vld1.8 {q2}, [r1, :64]!
bl aes_encrypt_3x
vst1.8 {q0-q1}, [r0, :64]!
vst1.8 {q2}, [r0, :64]!
b .Lecbencloop3x
.Lecbenc1x:
adds r4, r4, #3
beq .Lecbencout
.Lecbencloop:
vld1.8 {q0}, [r1, :64]!
bl aes_encrypt
vst1.8 {q0}, [r0, :64]!
subs r4, r4, #1
bne .Lecbencloop
.Lecbencout:
pop {r4, pc}
ENDPROC(ce_aes_ecb_encrypt)
ENTRY(ce_aes_ecb_decrypt)
push {r4, lr}
ldr r4, [sp, #8]
prepare_key r2, r3
.Lecbdecloop3x:
subs r4, r4, #3
bmi .Lecbdec1x
vld1.8 {q0-q1}, [r1, :64]!
vld1.8 {q2}, [r1, :64]!
bl aes_decrypt_3x
vst1.8 {q0-q1}, [r0, :64]!
vst1.8 {q2}, [r0, :64]!
b .Lecbdecloop3x
.Lecbdec1x:
adds r4, r4, #3
beq .Lecbdecout
.Lecbdecloop:
vld1.8 {q0}, [r1, :64]!
bl aes_decrypt
vst1.8 {q0}, [r0, :64]!
subs r4, r4, #1
bne .Lecbdecloop
.Lecbdecout:
pop {r4, pc}
ENDPROC(ce_aes_ecb_decrypt)
/*
* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
*/
ENTRY(ce_aes_cbc_encrypt)
push {r4-r6, lr}
ldrd r4, r5, [sp, #16]
vld1.8 {q0}, [r5]
prepare_key r2, r3
.Lcbcencloop:
vld1.8 {q1}, [r1, :64]! @ get next pt block
veor q0, q0, q1 @ ..and xor with iv
bl aes_encrypt
vst1.8 {q0}, [r0, :64]!
subs r4, r4, #1
bne .Lcbcencloop
vst1.8 {q0}, [r5]
pop {r4-r6, pc}
ENDPROC(ce_aes_cbc_encrypt)
ENTRY(ce_aes_cbc_decrypt)
push {r4-r6, lr}
ldrd r4, r5, [sp, #16]
vld1.8 {q6}, [r5] @ keep iv in q6
prepare_key r2, r3
.Lcbcdecloop3x:
subs r4, r4, #3
bmi .Lcbcdec1x
vld1.8 {q0-q1}, [r1, :64]!
vld1.8 {q2}, [r1, :64]!
vmov q3, q0
vmov q4, q1
vmov q5, q2
bl aes_decrypt_3x
veor q0, q0, q6
veor q1, q1, q3
veor q2, q2, q4
vmov q6, q5
vst1.8 {q0-q1}, [r0, :64]!
vst1.8 {q2}, [r0, :64]!
b .Lcbcdecloop3x
.Lcbcdec1x:
adds r4, r4, #3
beq .Lcbcdecout
vmov q15, q14 @ preserve last round key
.Lcbcdecloop:
vld1.8 {q0}, [r1, :64]! @ get next ct block
veor q14, q15, q6 @ combine prev ct with last key
vmov q6, q0
bl aes_decrypt
vst1.8 {q0}, [r0, :64]!
subs r4, r4, #1
bne .Lcbcdecloop
.Lcbcdecout:
vst1.8 {q6}, [r5] @ keep iv in q6
pop {r4-r6, pc}
ENDPROC(ce_aes_cbc_decrypt)
/*
* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 ctr[])
*/
ENTRY(ce_aes_ctr_encrypt)
push {r4-r6, lr}
ldrd r4, r5, [sp, #16]
vld1.8 {q6}, [r5] @ load ctr
prepare_key r2, r3
vmov r6, s27 @ keep swabbed ctr in r6
rev r6, r6
cmn r6, r4 @ 32 bit overflow?
bcs .Lctrloop
.Lctrloop3x:
subs r4, r4, #3
bmi .Lctr1x
add r6, r6, #1
vmov q0, q6
vmov q1, q6
rev ip, r6
add r6, r6, #1
vmov q2, q6
vmov s7, ip
rev ip, r6
add r6, r6, #1
vmov s11, ip
vld1.8 {q3-q4}, [r1, :64]!
vld1.8 {q5}, [r1, :64]!
bl aes_encrypt_3x
veor q0, q0, q3
veor q1, q1, q4
veor q2, q2, q5
rev ip, r6
vst1.8 {q0-q1}, [r0, :64]!
vst1.8 {q2}, [r0, :64]!
vmov s27, ip
b .Lctrloop3x
.Lctr1x:
adds r4, r4, #3
beq .Lctrout
.Lctrloop:
vmov q0, q6
bl aes_encrypt
subs r4, r4, #1
bmi .Lctrhalfblock @ blocks < 0 means 1/2 block
vld1.8 {q3}, [r1, :64]!
veor q3, q0, q3
vst1.8 {q3}, [r0, :64]!
adds r6, r6, #1 @ increment BE ctr
rev ip, r6
vmov s27, ip
bcs .Lctrcarry
teq r4, #0
bne .Lctrloop
.Lctrout:
vst1.8 {q6}, [r5]
pop {r4-r6, pc}
.Lctrhalfblock:
vld1.8 {d1}, [r1, :64]
veor d0, d0, d1
vst1.8 {d0}, [r0, :64]
pop {r4-r6, pc}
.Lctrcarry:
.irp sreg, s26, s25, s24
vmov ip, \sreg @ load next word of ctr
rev ip, ip @ ... to handle the carry
adds ip, ip, #1
rev ip, ip
vmov \sreg, ip
bcc 0f
.endr
0: teq r4, #0
beq .Lctrout
b .Lctrloop
ENDPROC(ce_aes_ctr_encrypt)
/*
* aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 iv[], u8 const rk2[], int first)
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 iv[], u8 const rk2[], int first)
*/
.macro next_tweak, out, in, const, tmp
vshr.s64 \tmp, \in, #63
vand \tmp, \tmp, \const
vadd.u64 \out, \in, \in
vext.8 \tmp, \tmp, \tmp, #8
veor \out, \out, \tmp
.endm
.align 3
.Lxts_mul_x:
.quad 1, 0x87
ce_aes_xts_init:
vldr d14, .Lxts_mul_x
vldr d15, .Lxts_mul_x + 8
ldrd r4, r5, [sp, #16] @ load args
ldr r6, [sp, #28]
vld1.8 {q0}, [r5] @ load iv
teq r6, #1 @ start of a block?
bxne lr
@ Encrypt the IV in q0 with the second AES key. This should only
@ be done at the start of a block.
ldr r6, [sp, #24] @ load AES key 2
prepare_key r6, r3
add ip, r6, #32 @ 3rd round key of key 2
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)

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@ -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);