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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SM4-CCM AEAD Algorithm using ARMv8 Crypto Extensions
* as specified in rfc8998
* https://datatracker.ietf.org/doc/html/rfc8998
*
* Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include "sm4-ce-asm.h"
.arch armv8-a+crypto
.irp b, 0, 1, 8, 9, 10, 11, 12, 13, 14, 15, 16, 24, 25, 26, 27, 28, 29, 30, 31
.set .Lv\b\().4s, \b
.endr
.macro sm4e, vd, vn
.inst 0xcec08400 | (.L\vn << 5) | .L\vd
.endm
/* Register macros */
#define RMAC v16
/* Helper macros. */
#define inc_le128(vctr) \
mov vctr.d[1], x8; \
mov vctr.d[0], x7; \
adds x8, x8, #1; \
rev64 vctr.16b, vctr.16b; \
adc x7, x7, xzr;
.align 3
SYM_FUNC_START(sm4_ce_cbcmac_update)
/* input:
* x0: round key array, CTX
* x1: mac
* x2: src
* w3: nblocks
*/
SM4_PREPARE(x0)
ld1 {RMAC.16b}, [x1]
.Lcbcmac_loop_4x:
cmp w3, #4
blt .Lcbcmac_loop_1x
sub w3, w3, #4
ld1 {v0.16b-v3.16b}, [x2], #64
SM4_CRYPT_BLK(RMAC)
eor RMAC.16b, RMAC.16b, v0.16b
SM4_CRYPT_BLK(RMAC)
eor RMAC.16b, RMAC.16b, v1.16b
SM4_CRYPT_BLK(RMAC)
eor RMAC.16b, RMAC.16b, v2.16b
SM4_CRYPT_BLK(RMAC)
eor RMAC.16b, RMAC.16b, v3.16b
cbz w3, .Lcbcmac_end
b .Lcbcmac_loop_4x
.Lcbcmac_loop_1x:
sub w3, w3, #1
ld1 {v0.16b}, [x2], #16
SM4_CRYPT_BLK(RMAC)
eor RMAC.16b, RMAC.16b, v0.16b
cbnz w3, .Lcbcmac_loop_1x
.Lcbcmac_end:
st1 {RMAC.16b}, [x1]
ret
SYM_FUNC_END(sm4_ce_cbcmac_update)
.align 3
SYM_FUNC_START(sm4_ce_ccm_final)
/* input:
* x0: round key array, CTX
* x1: ctr0 (big endian, 128 bit)
* x2: mac
*/
SM4_PREPARE(x0)
ld1 {RMAC.16b}, [x2]
ld1 {v0.16b}, [x1]
SM4_CRYPT_BLK2(RMAC, v0)
/* en-/decrypt the mac with ctr0 */
eor RMAC.16b, RMAC.16b, v0.16b
st1 {RMAC.16b}, [x2]
ret
SYM_FUNC_END(sm4_ce_ccm_final)
.align 3
SYM_FUNC_START(sm4_ce_ccm_enc)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: ctr (big endian, 128 bit)
* w4: nbytes
* x5: mac
*/
SM4_PREPARE(x0)
ldp x7, x8, [x3]
rev x7, x7
rev x8, x8
ld1 {RMAC.16b}, [x5]
.Lccm_enc_loop_4x:
cmp w4, #(4 * 16)
blt .Lccm_enc_loop_1x
sub w4, w4, #(4 * 16)
/* construct CTRs */
inc_le128(v8) /* +0 */
inc_le128(v9) /* +1 */
inc_le128(v10) /* +2 */
inc_le128(v11) /* +3 */
ld1 {v0.16b-v3.16b}, [x2], #64
SM4_CRYPT_BLK2(v8, RMAC)
eor v8.16b, v8.16b, v0.16b
eor RMAC.16b, RMAC.16b, v0.16b
SM4_CRYPT_BLK2(v9, RMAC)
eor v9.16b, v9.16b, v1.16b
eor RMAC.16b, RMAC.16b, v1.16b
SM4_CRYPT_BLK2(v10, RMAC)
eor v10.16b, v10.16b, v2.16b
eor RMAC.16b, RMAC.16b, v2.16b
SM4_CRYPT_BLK2(v11, RMAC)
eor v11.16b, v11.16b, v3.16b
eor RMAC.16b, RMAC.16b, v3.16b
st1 {v8.16b-v11.16b}, [x1], #64
cbz w4, .Lccm_enc_end
b .Lccm_enc_loop_4x
.Lccm_enc_loop_1x:
cmp w4, #16
blt .Lccm_enc_tail
sub w4, w4, #16
/* construct CTRs */
inc_le128(v8)
ld1 {v0.16b}, [x2], #16
SM4_CRYPT_BLK2(v8, RMAC)
eor v8.16b, v8.16b, v0.16b
eor RMAC.16b, RMAC.16b, v0.16b
st1 {v8.16b}, [x1], #16
cbz w4, .Lccm_enc_end
b .Lccm_enc_loop_1x
.Lccm_enc_tail:
/* construct CTRs */
inc_le128(v8)
SM4_CRYPT_BLK2(RMAC, v8)
/* store new MAC */
st1 {RMAC.16b}, [x5]
.Lccm_enc_tail_loop:
ldrb w0, [x2], #1 /* get 1 byte from input */
umov w9, v8.b[0] /* get top crypted CTR byte */
umov w6, RMAC.b[0] /* get top MAC byte */
eor w9, w9, w0 /* w9 = CTR ^ input */
eor w6, w6, w0 /* w6 = MAC ^ input */
strb w9, [x1], #1 /* store out byte */
strb w6, [x5], #1 /* store MAC byte */
subs w4, w4, #1
beq .Lccm_enc_ret
/* shift out one byte */
ext RMAC.16b, RMAC.16b, RMAC.16b, #1
ext v8.16b, v8.16b, v8.16b, #1
b .Lccm_enc_tail_loop
.Lccm_enc_end:
/* store new MAC */
st1 {RMAC.16b}, [x5]
/* store new CTR */
rev x7, x7
rev x8, x8
stp x7, x8, [x3]
.Lccm_enc_ret:
ret
SYM_FUNC_END(sm4_ce_ccm_enc)
.align 3
SYM_FUNC_START(sm4_ce_ccm_dec)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: ctr (big endian, 128 bit)
* w4: nbytes
* x5: mac
*/
SM4_PREPARE(x0)
ldp x7, x8, [x3]
rev x7, x7
rev x8, x8
ld1 {RMAC.16b}, [x5]
.Lccm_dec_loop_4x:
cmp w4, #(4 * 16)
blt .Lccm_dec_loop_1x
sub w4, w4, #(4 * 16)
/* construct CTRs */
inc_le128(v8) /* +0 */
inc_le128(v9) /* +1 */
inc_le128(v10) /* +2 */
inc_le128(v11) /* +3 */
ld1 {v0.16b-v3.16b}, [x2], #64
SM4_CRYPT_BLK2(v8, RMAC)
eor v8.16b, v8.16b, v0.16b
eor RMAC.16b, RMAC.16b, v8.16b
SM4_CRYPT_BLK2(v9, RMAC)
eor v9.16b, v9.16b, v1.16b
eor RMAC.16b, RMAC.16b, v9.16b
SM4_CRYPT_BLK2(v10, RMAC)
eor v10.16b, v10.16b, v2.16b
eor RMAC.16b, RMAC.16b, v10.16b
SM4_CRYPT_BLK2(v11, RMAC)
eor v11.16b, v11.16b, v3.16b
eor RMAC.16b, RMAC.16b, v11.16b
st1 {v8.16b-v11.16b}, [x1], #64
cbz w4, .Lccm_dec_end
b .Lccm_dec_loop_4x
.Lccm_dec_loop_1x:
cmp w4, #16
blt .Lccm_dec_tail
sub w4, w4, #16
/* construct CTRs */
inc_le128(v8)
ld1 {v0.16b}, [x2], #16
SM4_CRYPT_BLK2(v8, RMAC)
eor v8.16b, v8.16b, v0.16b
eor RMAC.16b, RMAC.16b, v8.16b
st1 {v8.16b}, [x1], #16
cbz w4, .Lccm_dec_end
b .Lccm_dec_loop_1x
.Lccm_dec_tail:
/* construct CTRs */
inc_le128(v8)
SM4_CRYPT_BLK2(RMAC, v8)
/* store new MAC */
st1 {RMAC.16b}, [x5]
.Lccm_dec_tail_loop:
ldrb w0, [x2], #1 /* get 1 byte from input */
umov w9, v8.b[0] /* get top crypted CTR byte */
umov w6, RMAC.b[0] /* get top MAC byte */
eor w9, w9, w0 /* w9 = CTR ^ input */
eor w6, w6, w9 /* w6 = MAC ^ output */
strb w9, [x1], #1 /* store out byte */
strb w6, [x5], #1 /* store MAC byte */
subs w4, w4, #1
beq .Lccm_dec_ret
/* shift out one byte */
ext RMAC.16b, RMAC.16b, RMAC.16b, #1
ext v8.16b, v8.16b, v8.16b, #1
b .Lccm_dec_tail_loop
.Lccm_dec_end:
/* store new MAC */
st1 {RMAC.16b}, [x5]
/* store new CTR */
rev x7, x7
rev x8, x8
stp x7, x8, [x3]
.Lccm_dec_ret:
ret
SYM_FUNC_END(sm4_ce_ccm_dec)
|
