aes-modes.S
12 KB
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/*
* linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES
*
* Copyright (C) 2013 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.
*/
/* included by aes-ce.S and aes-neon.S */
.text
.align 4
/*
* There are several ways to instantiate this code:
* - no interleave, all inline
* - 2-way interleave, 2x calls out of line (-DINTERLEAVE=2)
* - 2-way interleave, all inline (-DINTERLEAVE=2 -DINTERLEAVE_INLINE)
* - 4-way interleave, 4x calls out of line (-DINTERLEAVE=4)
* - 4-way interleave, all inline (-DINTERLEAVE=4 -DINTERLEAVE_INLINE)
*
* Macros imported by this code:
* - enc_prepare - setup NEON registers for encryption
* - dec_prepare - setup NEON registers for decryption
* - enc_switch_key - change to new key after having prepared for encryption
* - encrypt_block - encrypt a single block
* - decrypt block - decrypt a single block
* - encrypt_block2x - encrypt 2 blocks in parallel (if INTERLEAVE == 2)
* - decrypt_block2x - decrypt 2 blocks in parallel (if INTERLEAVE == 2)
* - encrypt_block4x - encrypt 4 blocks in parallel (if INTERLEAVE == 4)
* - decrypt_block4x - decrypt 4 blocks in parallel (if INTERLEAVE == 4)
*/
#if defined(INTERLEAVE) && !defined(INTERLEAVE_INLINE)
#define FRAME_PUSH stp x29, x30, [sp,#-16]! ; mov x29, sp
#define FRAME_POP ldp x29, x30, [sp],#16
#if INTERLEAVE == 2
aes_encrypt_block2x:
encrypt_block2x v0, v1, w3, x2, x6, w7
ret
ENDPROC(aes_encrypt_block2x)
aes_decrypt_block2x:
decrypt_block2x v0, v1, w3, x2, x6, w7
ret
ENDPROC(aes_decrypt_block2x)
#elif INTERLEAVE == 4
aes_encrypt_block4x:
encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
ret
ENDPROC(aes_encrypt_block4x)
aes_decrypt_block4x:
decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
ret
ENDPROC(aes_decrypt_block4x)
#else
#error INTERLEAVE should equal 2 or 4
#endif
.macro do_encrypt_block2x
bl aes_encrypt_block2x
.endm
.macro do_decrypt_block2x
bl aes_decrypt_block2x
.endm
.macro do_encrypt_block4x
bl aes_encrypt_block4x
.endm
.macro do_decrypt_block4x
bl aes_decrypt_block4x
.endm
#else
#define FRAME_PUSH
#define FRAME_POP
.macro do_encrypt_block2x
encrypt_block2x v0, v1, w3, x2, x6, w7
.endm
.macro do_decrypt_block2x
decrypt_block2x v0, v1, w3, x2, x6, w7
.endm
.macro do_encrypt_block4x
encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
.endm
.macro do_decrypt_block4x
decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
.endm
#endif
/*
* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, int first)
* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, int first)
*/
AES_ENTRY(aes_ecb_encrypt)
FRAME_PUSH
cbz w5, .LecbencloopNx
enc_prepare w3, x2, x5
.LecbencloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lecbenc1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
do_encrypt_block2x
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
do_encrypt_block4x
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LecbencloopNx
.Lecbenc1x:
adds w4, w4, #INTERLEAVE
beq .Lecbencout
#endif
.Lecbencloop:
ld1 {v0.16b}, [x1], #16 /* get next pt block */
encrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbencloop
.Lecbencout:
FRAME_POP
ret
AES_ENDPROC(aes_ecb_encrypt)
AES_ENTRY(aes_ecb_decrypt)
FRAME_PUSH
cbz w5, .LecbdecloopNx
dec_prepare w3, x2, x5
.LecbdecloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lecbdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
do_decrypt_block2x
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
do_decrypt_block4x
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LecbdecloopNx
.Lecbdec1x:
adds w4, w4, #INTERLEAVE
beq .Lecbdecout
#endif
.Lecbdecloop:
ld1 {v0.16b}, [x1], #16 /* get next ct block */
decrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbdecloop
.Lecbdecout:
FRAME_POP
ret
AES_ENDPROC(aes_ecb_decrypt)
/*
* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[], int first)
* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[], int first)
*/
AES_ENTRY(aes_cbc_encrypt)
cbz w6, .Lcbcencloop
ld1 {v0.16b}, [x5] /* get iv */
enc_prepare w3, x2, x6
.Lcbcencloop:
ld1 {v1.16b}, [x1], #16 /* get next pt block */
eor v0.16b, v0.16b, v1.16b /* ..and xor with iv */
encrypt_block v0, w3, x2, x6, w7
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcencloop
st1 {v0.16b}, [x5] /* return iv */
ret
AES_ENDPROC(aes_cbc_encrypt)
AES_ENTRY(aes_cbc_decrypt)
FRAME_PUSH
cbz w6, .LcbcdecloopNx
ld1 {v7.16b}, [x5] /* get iv */
dec_prepare w3, x2, x6
.LcbcdecloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lcbcdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
mov v2.16b, v0.16b
mov v3.16b, v1.16b
do_decrypt_block2x
eor v0.16b, v0.16b, v7.16b
eor v1.16b, v1.16b, v2.16b
mov v7.16b, v3.16b
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
mov v4.16b, v0.16b
mov v5.16b, v1.16b
mov v6.16b, v2.16b
do_decrypt_block4x
sub x1, x1, #16
eor v0.16b, v0.16b, v7.16b
eor v1.16b, v1.16b, v4.16b
ld1 {v7.16b}, [x1], #16 /* reload 1 ct block */
eor v2.16b, v2.16b, v5.16b
eor v3.16b, v3.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LcbcdecloopNx
.Lcbcdec1x:
adds w4, w4, #INTERLEAVE
beq .Lcbcdecout
#endif
.Lcbcdecloop:
ld1 {v1.16b}, [x1], #16 /* get next ct block */
mov v0.16b, v1.16b /* ...and copy to v0 */
decrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v7.16b /* xor with iv => pt */
mov v7.16b, v1.16b /* ct is next iv */
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcdecloop
.Lcbcdecout:
FRAME_POP
st1 {v7.16b}, [x5] /* return iv */
ret
AES_ENDPROC(aes_cbc_decrypt)
/*
* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 ctr[], int first)
*/
AES_ENTRY(aes_ctr_encrypt)
FRAME_PUSH
cbz w6, .Lctrnotfirst /* 1st time around? */
enc_prepare w3, x2, x6
ld1 {v4.16b}, [x5]
.Lctrnotfirst:
umov x8, v4.d[1] /* keep swabbed ctr in reg */
rev x8, x8
#if INTERLEAVE >= 2
cmn w8, w4 /* 32 bit overflow? */
bcs .Lctrloop
.LctrloopNx:
subs w4, w4, #INTERLEAVE
bmi .Lctr1x
#if INTERLEAVE == 2
mov v0.8b, v4.8b
mov v1.8b, v4.8b
rev x7, x8
add x8, x8, #1
ins v0.d[1], x7
rev x7, x8
add x8, x8, #1
ins v1.d[1], x7
ld1 {v2.16b-v3.16b}, [x1], #32 /* get 2 input blocks */
do_encrypt_block2x
eor v0.16b, v0.16b, v2.16b
eor v1.16b, v1.16b, v3.16b
st1 {v0.16b-v1.16b}, [x0], #32
#else
ldr q8, =0x30000000200000001 /* addends 1,2,3[,0] */
dup v7.4s, w8
mov v0.16b, v4.16b
add v7.4s, v7.4s, v8.4s
mov v1.16b, v4.16b
rev32 v8.16b, v7.16b
mov v2.16b, v4.16b
mov v3.16b, v4.16b
mov v1.s[3], v8.s[0]
mov v2.s[3], v8.s[1]
mov v3.s[3], v8.s[2]
ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
do_encrypt_block4x
eor v0.16b, v5.16b, v0.16b
ld1 {v5.16b}, [x1], #16 /* get 1 input block */
eor v1.16b, v6.16b, v1.16b
eor v2.16b, v7.16b, v2.16b
eor v3.16b, v5.16b, v3.16b
st1 {v0.16b-v3.16b}, [x0], #64
add x8, x8, #INTERLEAVE
#endif
rev x7, x8
ins v4.d[1], x7
cbz w4, .Lctrout
b .LctrloopNx
.Lctr1x:
adds w4, w4, #INTERLEAVE
beq .Lctrout
#endif
.Lctrloop:
mov v0.16b, v4.16b
encrypt_block v0, w3, x2, x6, w7
adds x8, x8, #1 /* increment BE ctr */
rev x7, x8
ins v4.d[1], x7
bcs .Lctrcarry /* overflow? */
.Lctrcarrydone:
subs w4, w4, #1
bmi .Lctrhalfblock /* blocks < 0 means 1/2 block */
ld1 {v3.16b}, [x1], #16
eor v3.16b, v0.16b, v3.16b
st1 {v3.16b}, [x0], #16
bne .Lctrloop
.Lctrout:
st1 {v4.16b}, [x5] /* return next CTR value */
FRAME_POP
ret
.Lctrhalfblock:
ld1 {v3.8b}, [x1]
eor v3.8b, v0.8b, v3.8b
st1 {v3.8b}, [x0]
FRAME_POP
ret
.Lctrcarry:
umov x7, v4.d[0] /* load upper word of ctr */
rev x7, x7 /* ... to handle the carry */
add x7, x7, #1
rev x7, x7
ins v4.d[0], x7
b .Lctrcarrydone
AES_ENDPROC(aes_ctr_encrypt)
.ltorg
/*
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 const rk2[], u8 iv[], int first)
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 const rk2[], u8 iv[], int first)
*/
.macro next_tweak, out, in, const, tmp
sshr \tmp\().2d, \in\().2d, #63
and \tmp\().16b, \tmp\().16b, \const\().16b
add \out\().2d, \in\().2d, \in\().2d
ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
eor \out\().16b, \out\().16b, \tmp\().16b
.endm
.Lxts_mul_x:
CPU_LE( .quad 1, 0x87 )
CPU_BE( .quad 0x87, 1 )
AES_ENTRY(aes_xts_encrypt)
FRAME_PUSH
cbz w7, .LxtsencloopNx
ld1 {v4.16b}, [x6]
enc_prepare w3, x5, x6
encrypt_block v4, w3, x5, x6, w7 /* first tweak */
enc_switch_key w3, x2, x6
ldr q7, .Lxts_mul_x
b .LxtsencNx
.LxtsencloopNx:
ldr q7, .Lxts_mul_x
next_tweak v4, v4, v7, v8
.LxtsencNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lxtsenc1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
do_encrypt_block2x
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
st1 {v0.16b-v1.16b}, [x0], #32
cbz w4, .LxtsencoutNx
next_tweak v4, v5, v7, v8
b .LxtsencNx
.LxtsencoutNx:
mov v4.16b, v5.16b
b .Lxtsencout
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v7, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v7, v8
eor v3.16b, v3.16b, v7.16b
do_encrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsencout
b .LxtsencloopNx
#endif
.Lxtsenc1x:
adds w4, w4, #INTERLEAVE
beq .Lxtsencout
#endif
.Lxtsencloop:
ld1 {v1.16b}, [x1], #16
eor v0.16b, v1.16b, v4.16b
encrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
beq .Lxtsencout
next_tweak v4, v4, v7, v8
b .Lxtsencloop
.Lxtsencout:
FRAME_POP
ret
AES_ENDPROC(aes_xts_encrypt)
AES_ENTRY(aes_xts_decrypt)
FRAME_PUSH
cbz w7, .LxtsdecloopNx
ld1 {v4.16b}, [x6]
enc_prepare w3, x5, x6
encrypt_block v4, w3, x5, x6, w7 /* first tweak */
dec_prepare w3, x2, x6
ldr q7, .Lxts_mul_x
b .LxtsdecNx
.LxtsdecloopNx:
ldr q7, .Lxts_mul_x
next_tweak v4, v4, v7, v8
.LxtsdecNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lxtsdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
do_decrypt_block2x
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
st1 {v0.16b-v1.16b}, [x0], #32
cbz w4, .LxtsdecoutNx
next_tweak v4, v5, v7, v8
b .LxtsdecNx
.LxtsdecoutNx:
mov v4.16b, v5.16b
b .Lxtsdecout
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v7, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v7, v8
eor v3.16b, v3.16b, v7.16b
do_decrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsdecout
b .LxtsdecloopNx
#endif
.Lxtsdec1x:
adds w4, w4, #INTERLEAVE
beq .Lxtsdecout
#endif
.Lxtsdecloop:
ld1 {v1.16b}, [x1], #16
eor v0.16b, v1.16b, v4.16b
decrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
beq .Lxtsdecout
next_tweak v4, v4, v7, v8
b .Lxtsdecloop
.Lxtsdecout:
FRAME_POP
ret
AES_ENDPROC(aes_xts_decrypt)