222 lines
5.8 KiB
ArmAsm
222 lines
5.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* aesce-ccm-core.S - AES-CCM transform for ARMv8 with Crypto Extensions
|
|
*
|
|
* Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
|
|
.text
|
|
.arch armv8-a+crypto
|
|
|
|
/*
|
|
* void ce_aes_ccm_auth_data(u8 mac[], u8 const in[], u32 abytes,
|
|
* u32 *macp, u8 const rk[], u32 rounds);
|
|
*/
|
|
ENTRY(ce_aes_ccm_auth_data)
|
|
ldr w8, [x3] /* leftover from prev round? */
|
|
ld1 {v0.16b}, [x0] /* load mac */
|
|
cbz w8, 1f
|
|
sub w8, w8, #16
|
|
eor v1.16b, v1.16b, v1.16b
|
|
0: ldrb w7, [x1], #1 /* get 1 byte of input */
|
|
subs w2, w2, #1
|
|
add w8, w8, #1
|
|
ins v1.b[0], w7
|
|
ext v1.16b, v1.16b, v1.16b, #1 /* rotate in the input bytes */
|
|
beq 8f /* out of input? */
|
|
cbnz w8, 0b
|
|
eor v0.16b, v0.16b, v1.16b
|
|
1: ld1 {v3.4s}, [x4] /* load first round key */
|
|
prfm pldl1strm, [x1]
|
|
cmp w5, #12 /* which key size? */
|
|
add x6, x4, #16
|
|
sub w7, w5, #2 /* modified # of rounds */
|
|
bmi 2f
|
|
bne 5f
|
|
mov v5.16b, v3.16b
|
|
b 4f
|
|
2: mov v4.16b, v3.16b
|
|
ld1 {v5.4s}, [x6], #16 /* load 2nd round key */
|
|
3: aese v0.16b, v4.16b
|
|
aesmc v0.16b, v0.16b
|
|
4: ld1 {v3.4s}, [x6], #16 /* load next round key */
|
|
aese v0.16b, v5.16b
|
|
aesmc v0.16b, v0.16b
|
|
5: ld1 {v4.4s}, [x6], #16 /* load next round key */
|
|
subs w7, w7, #3
|
|
aese v0.16b, v3.16b
|
|
aesmc v0.16b, v0.16b
|
|
ld1 {v5.4s}, [x6], #16 /* load next round key */
|
|
bpl 3b
|
|
aese v0.16b, v4.16b
|
|
subs w2, w2, #16 /* last data? */
|
|
eor v0.16b, v0.16b, v5.16b /* final round */
|
|
bmi 6f
|
|
ld1 {v1.16b}, [x1], #16 /* load next input block */
|
|
eor v0.16b, v0.16b, v1.16b /* xor with mac */
|
|
bne 1b
|
|
6: st1 {v0.16b}, [x0] /* store mac */
|
|
beq 10f
|
|
adds w2, w2, #16
|
|
beq 10f
|
|
mov w8, w2
|
|
7: ldrb w7, [x1], #1
|
|
umov w6, v0.b[0]
|
|
eor w6, w6, w7
|
|
strb w6, [x0], #1
|
|
subs w2, w2, #1
|
|
beq 10f
|
|
ext v0.16b, v0.16b, v0.16b, #1 /* rotate out the mac bytes */
|
|
b 7b
|
|
8: cbz w8, 91f
|
|
mov w7, w8
|
|
add w8, w8, #16
|
|
9: ext v1.16b, v1.16b, v1.16b, #1
|
|
adds w7, w7, #1
|
|
bne 9b
|
|
91: eor v0.16b, v0.16b, v1.16b
|
|
st1 {v0.16b}, [x0]
|
|
10: str w8, [x3]
|
|
ret
|
|
ENDPROC(ce_aes_ccm_auth_data)
|
|
|
|
/*
|
|
* void ce_aes_ccm_final(u8 mac[], u8 const ctr[], u8 const rk[],
|
|
* u32 rounds);
|
|
*/
|
|
ENTRY(ce_aes_ccm_final)
|
|
ld1 {v3.4s}, [x2], #16 /* load first round key */
|
|
ld1 {v0.16b}, [x0] /* load mac */
|
|
cmp w3, #12 /* which key size? */
|
|
sub w3, w3, #2 /* modified # of rounds */
|
|
ld1 {v1.16b}, [x1] /* load 1st ctriv */
|
|
bmi 0f
|
|
bne 3f
|
|
mov v5.16b, v3.16b
|
|
b 2f
|
|
0: mov v4.16b, v3.16b
|
|
1: ld1 {v5.4s}, [x2], #16 /* load next round key */
|
|
aese v0.16b, v4.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v4.16b
|
|
aesmc v1.16b, v1.16b
|
|
2: ld1 {v3.4s}, [x2], #16 /* load next round key */
|
|
aese v0.16b, v5.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v5.16b
|
|
aesmc v1.16b, v1.16b
|
|
3: ld1 {v4.4s}, [x2], #16 /* load next round key */
|
|
subs w3, w3, #3
|
|
aese v0.16b, v3.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v3.16b
|
|
aesmc v1.16b, v1.16b
|
|
bpl 1b
|
|
aese v0.16b, v4.16b
|
|
aese v1.16b, v4.16b
|
|
/* final round key cancels out */
|
|
eor v0.16b, v0.16b, v1.16b /* en-/decrypt the mac */
|
|
st1 {v0.16b}, [x0] /* store result */
|
|
ret
|
|
ENDPROC(ce_aes_ccm_final)
|
|
|
|
.macro aes_ccm_do_crypt,enc
|
|
ldr x8, [x6, #8] /* load lower ctr */
|
|
ld1 {v0.16b}, [x5] /* load mac */
|
|
CPU_LE( rev x8, x8 ) /* keep swabbed ctr in reg */
|
|
0: /* outer loop */
|
|
ld1 {v1.8b}, [x6] /* load upper ctr */
|
|
prfm pldl1strm, [x1]
|
|
add x8, x8, #1
|
|
rev x9, x8
|
|
cmp w4, #12 /* which key size? */
|
|
sub w7, w4, #2 /* get modified # of rounds */
|
|
ins v1.d[1], x9 /* no carry in lower ctr */
|
|
ld1 {v3.4s}, [x3] /* load first round key */
|
|
add x10, x3, #16
|
|
bmi 1f
|
|
bne 4f
|
|
mov v5.16b, v3.16b
|
|
b 3f
|
|
1: mov v4.16b, v3.16b
|
|
ld1 {v5.4s}, [x10], #16 /* load 2nd round key */
|
|
2: /* inner loop: 3 rounds, 2x interleaved */
|
|
aese v0.16b, v4.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v4.16b
|
|
aesmc v1.16b, v1.16b
|
|
3: ld1 {v3.4s}, [x10], #16 /* load next round key */
|
|
aese v0.16b, v5.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v5.16b
|
|
aesmc v1.16b, v1.16b
|
|
4: ld1 {v4.4s}, [x10], #16 /* load next round key */
|
|
subs w7, w7, #3
|
|
aese v0.16b, v3.16b
|
|
aesmc v0.16b, v0.16b
|
|
aese v1.16b, v3.16b
|
|
aesmc v1.16b, v1.16b
|
|
ld1 {v5.4s}, [x10], #16 /* load next round key */
|
|
bpl 2b
|
|
aese v0.16b, v4.16b
|
|
aese v1.16b, v4.16b
|
|
subs w2, w2, #16
|
|
bmi 6f /* partial block? */
|
|
ld1 {v2.16b}, [x1], #16 /* load next input block */
|
|
.if \enc == 1
|
|
eor v2.16b, v2.16b, v5.16b /* final round enc+mac */
|
|
eor v1.16b, v1.16b, v2.16b /* xor with crypted ctr */
|
|
.else
|
|
eor v2.16b, v2.16b, v1.16b /* xor with crypted ctr */
|
|
eor v1.16b, v2.16b, v5.16b /* final round enc */
|
|
.endif
|
|
eor v0.16b, v0.16b, v2.16b /* xor mac with pt ^ rk[last] */
|
|
st1 {v1.16b}, [x0], #16 /* write output block */
|
|
bne 0b
|
|
CPU_LE( rev x8, x8 )
|
|
st1 {v0.16b}, [x5] /* store mac */
|
|
str x8, [x6, #8] /* store lsb end of ctr (BE) */
|
|
5: ret
|
|
|
|
6: eor v0.16b, v0.16b, v5.16b /* final round mac */
|
|
eor v1.16b, v1.16b, v5.16b /* final round enc */
|
|
st1 {v0.16b}, [x5] /* store mac */
|
|
add w2, w2, #16 /* process partial tail block */
|
|
7: ldrb w9, [x1], #1 /* get 1 byte of input */
|
|
umov w6, v1.b[0] /* get top crypted ctr byte */
|
|
umov w7, v0.b[0] /* get top mac byte */
|
|
.if \enc == 1
|
|
eor w7, w7, w9
|
|
eor w9, w9, w6
|
|
.else
|
|
eor w9, w9, w6
|
|
eor w7, w7, w9
|
|
.endif
|
|
strb w9, [x0], #1 /* store out byte */
|
|
strb w7, [x5], #1 /* store mac byte */
|
|
subs w2, w2, #1
|
|
beq 5b
|
|
ext v0.16b, v0.16b, v0.16b, #1 /* shift out mac byte */
|
|
ext v1.16b, v1.16b, v1.16b, #1 /* shift out ctr byte */
|
|
b 7b
|
|
.endm
|
|
|
|
/*
|
|
* void ce_aes_ccm_encrypt(u8 out[], u8 const in[], u32 cbytes,
|
|
* u8 const rk[], u32 rounds, u8 mac[],
|
|
* u8 ctr[]);
|
|
* void ce_aes_ccm_decrypt(u8 out[], u8 const in[], u32 cbytes,
|
|
* u8 const rk[], u32 rounds, u8 mac[],
|
|
* u8 ctr[]);
|
|
*/
|
|
ENTRY(ce_aes_ccm_encrypt)
|
|
aes_ccm_do_crypt 1
|
|
ENDPROC(ce_aes_ccm_encrypt)
|
|
|
|
ENTRY(ce_aes_ccm_decrypt)
|
|
aes_ccm_do_crypt 0
|
|
ENDPROC(ce_aes_ccm_decrypt)
|