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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SM4 Cipher Algorithm for ARMv8 NEON
* as specified in
* https://tools.ietf.org/id/draft-ribose-cfrg-sm4-10.html
*
* Copyright (C) 2022, Alibaba Group.
* Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
/* Register macros */
#define RTMP0 v8
#define RTMP1 v9
#define RTMP2 v10
#define RTMP3 v11
#define RTMP4 v12
#define RTMP5 v13
#define RTMP6 v14
#define RTMP7 v15
#define RX0 v12
#define RX1 v13
#define RKEY v14
#define RIV v15
/* Helper macros. */
#define SM4_PREPARE() \
adr_l x5, crypto_sm4_sbox; \
ld1 {v16.16b-v19.16b}, [x5], #64; \
ld1 {v20.16b-v23.16b}, [x5], #64; \
ld1 {v24.16b-v27.16b}, [x5], #64; \
ld1 {v28.16b-v31.16b}, [x5];
#define transpose_4x4(s0, s1, s2, s3) \
zip1 RTMP0.4s, s0.4s, s1.4s; \
zip1 RTMP1.4s, s2.4s, s3.4s; \
zip2 RTMP2.4s, s0.4s, s1.4s; \
zip2 RTMP3.4s, s2.4s, s3.4s; \
zip1 s0.2d, RTMP0.2d, RTMP1.2d; \
zip2 s1.2d, RTMP0.2d, RTMP1.2d; \
zip1 s2.2d, RTMP2.2d, RTMP3.2d; \
zip2 s3.2d, RTMP2.2d, RTMP3.2d;
#define transpose_4x4_2x(s0, s1, s2, s3, s4, s5, s6, s7) \
zip1 RTMP0.4s, s0.4s, s1.4s; \
zip1 RTMP1.4s, s2.4s, s3.4s; \
zip2 RTMP2.4s, s0.4s, s1.4s; \
zip2 RTMP3.4s, s2.4s, s3.4s; \
zip1 RTMP4.4s, s4.4s, s5.4s; \
zip1 RTMP5.4s, s6.4s, s7.4s; \
zip2 RTMP6.4s, s4.4s, s5.4s; \
zip2 RTMP7.4s, s6.4s, s7.4s; \
zip1 s0.2d, RTMP0.2d, RTMP1.2d; \
zip2 s1.2d, RTMP0.2d, RTMP1.2d; \
zip1 s2.2d, RTMP2.2d, RTMP3.2d; \
zip2 s3.2d, RTMP2.2d, RTMP3.2d; \
zip1 s4.2d, RTMP4.2d, RTMP5.2d; \
zip2 s5.2d, RTMP4.2d, RTMP5.2d; \
zip1 s6.2d, RTMP6.2d, RTMP7.2d; \
zip2 s7.2d, RTMP6.2d, RTMP7.2d;
#define rotate_clockwise_4x4(s0, s1, s2, s3) \
zip1 RTMP0.4s, s1.4s, s0.4s; \
zip2 RTMP1.4s, s1.4s, s0.4s; \
zip1 RTMP2.4s, s3.4s, s2.4s; \
zip2 RTMP3.4s, s3.4s, s2.4s; \
zip1 s0.2d, RTMP2.2d, RTMP0.2d; \
zip2 s1.2d, RTMP2.2d, RTMP0.2d; \
zip1 s2.2d, RTMP3.2d, RTMP1.2d; \
zip2 s3.2d, RTMP3.2d, RTMP1.2d;
#define rotate_clockwise_4x4_2x(s0, s1, s2, s3, s4, s5, s6, s7) \
zip1 RTMP0.4s, s1.4s, s0.4s; \
zip1 RTMP2.4s, s3.4s, s2.4s; \
zip2 RTMP1.4s, s1.4s, s0.4s; \
zip2 RTMP3.4s, s3.4s, s2.4s; \
zip1 RTMP4.4s, s5.4s, s4.4s; \
zip1 RTMP6.4s, s7.4s, s6.4s; \
zip2 RTMP5.4s, s5.4s, s4.4s; \
zip2 RTMP7.4s, s7.4s, s6.4s; \
zip1 s0.2d, RTMP2.2d, RTMP0.2d; \
zip2 s1.2d, RTMP2.2d, RTMP0.2d; \
zip1 s2.2d, RTMP3.2d, RTMP1.2d; \
zip2 s3.2d, RTMP3.2d, RTMP1.2d; \
zip1 s4.2d, RTMP6.2d, RTMP4.2d; \
zip2 s5.2d, RTMP6.2d, RTMP4.2d; \
zip1 s6.2d, RTMP7.2d, RTMP5.2d; \
zip2 s7.2d, RTMP7.2d, RTMP5.2d;
#define ROUND4(round, s0, s1, s2, s3) \
dup RX0.4s, RKEY.s[round]; \
/* rk ^ s1 ^ s2 ^ s3 */ \
eor RTMP1.16b, s2.16b, s3.16b; \
eor RX0.16b, RX0.16b, s1.16b; \
eor RX0.16b, RX0.16b, RTMP1.16b; \
\
/* sbox, non-linear part */ \
movi RTMP3.16b, #64; /* sizeof(sbox) / 4 */ \
tbl RTMP0.16b, {v16.16b-v19.16b}, RX0.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
tbx RTMP0.16b, {v20.16b-v23.16b}, RX0.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
tbx RTMP0.16b, {v24.16b-v27.16b}, RX0.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
tbx RTMP0.16b, {v28.16b-v31.16b}, RX0.16b; \
\
/* linear part */ \
shl RTMP1.4s, RTMP0.4s, #8; \
shl RTMP2.4s, RTMP0.4s, #16; \
shl RTMP3.4s, RTMP0.4s, #24; \
sri RTMP1.4s, RTMP0.4s, #(32-8); \
sri RTMP2.4s, RTMP0.4s, #(32-16); \
sri RTMP3.4s, RTMP0.4s, #(32-24); \
/* RTMP1 = x ^ rol32(x, 8) ^ rol32(x, 16) */ \
eor RTMP1.16b, RTMP1.16b, RTMP0.16b; \
eor RTMP1.16b, RTMP1.16b, RTMP2.16b; \
/* RTMP3 = x ^ rol32(x, 24) ^ rol32(RTMP1, 2) */ \
eor RTMP3.16b, RTMP3.16b, RTMP0.16b; \
shl RTMP2.4s, RTMP1.4s, 2; \
sri RTMP2.4s, RTMP1.4s, #(32-2); \
eor RTMP3.16b, RTMP3.16b, RTMP2.16b; \
/* s0 ^= RTMP3 */ \
eor s0.16b, s0.16b, RTMP3.16b;
#define SM4_CRYPT_BLK4_BE(b0, b1, b2, b3) \
mov x6, 8; \
4: \
ld1 {RKEY.4s}, [x0], #16; \
subs x6, x6, #1; \
\
ROUND4(0, b0, b1, b2, b3); \
ROUND4(1, b1, b2, b3, b0); \
ROUND4(2, b2, b3, b0, b1); \
ROUND4(3, b3, b0, b1, b2); \
\
bne 4b; \
\
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
\
rotate_clockwise_4x4(b0, b1, b2, b3); \
\
/* repoint to rkey */ \
sub x0, x0, #128;
#define SM4_CRYPT_BLK4(b0, b1, b2, b3) \
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
SM4_CRYPT_BLK4_BE(b0, b1, b2, b3);
#define ROUND8(round, s0, s1, s2, s3, t0, t1, t2, t3) \
/* rk ^ s1 ^ s2 ^ s3 */ \
dup RX0.4s, RKEY.s[round]; \
eor RTMP0.16b, s2.16b, s3.16b; \
mov RX1.16b, RX0.16b; \
eor RTMP1.16b, t2.16b, t3.16b; \
eor RX0.16b, RX0.16b, s1.16b; \
eor RX1.16b, RX1.16b, t1.16b; \
eor RX0.16b, RX0.16b, RTMP0.16b; \
eor RX1.16b, RX1.16b, RTMP1.16b; \
\
/* sbox, non-linear part */ \
movi RTMP3.16b, #64; /* sizeof(sbox) / 4 */ \
tbl RTMP0.16b, {v16.16b-v19.16b}, RX0.16b; \
tbl RTMP1.16b, {v16.16b-v19.16b}, RX1.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
sub RX1.16b, RX1.16b, RTMP3.16b; \
tbx RTMP0.16b, {v20.16b-v23.16b}, RX0.16b; \
tbx RTMP1.16b, {v20.16b-v23.16b}, RX1.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
sub RX1.16b, RX1.16b, RTMP3.16b; \
tbx RTMP0.16b, {v24.16b-v27.16b}, RX0.16b; \
tbx RTMP1.16b, {v24.16b-v27.16b}, RX1.16b; \
sub RX0.16b, RX0.16b, RTMP3.16b; \
sub RX1.16b, RX1.16b, RTMP3.16b; \
tbx RTMP0.16b, {v28.16b-v31.16b}, RX0.16b; \
tbx RTMP1.16b, {v28.16b-v31.16b}, RX1.16b; \
\
/* linear part */ \
shl RX0.4s, RTMP0.4s, #8; \
shl RX1.4s, RTMP1.4s, #8; \
shl RTMP2.4s, RTMP0.4s, #16; \
shl RTMP3.4s, RTMP1.4s, #16; \
sri RX0.4s, RTMP0.4s, #(32 - 8); \
sri RX1.4s, RTMP1.4s, #(32 - 8); \
sri RTMP2.4s, RTMP0.4s, #(32 - 16); \
sri RTMP3.4s, RTMP1.4s, #(32 - 16); \
/* RX = x ^ rol32(x, 8) ^ rol32(x, 16) */ \
eor RX0.16b, RX0.16b, RTMP0.16b; \
eor RX1.16b, RX1.16b, RTMP1.16b; \
eor RX0.16b, RX0.16b, RTMP2.16b; \
eor RX1.16b, RX1.16b, RTMP3.16b; \
/* RTMP0/1 ^= x ^ rol32(x, 24) ^ rol32(RX, 2) */ \
shl RTMP2.4s, RTMP0.4s, #24; \
shl RTMP3.4s, RTMP1.4s, #24; \
sri RTMP2.4s, RTMP0.4s, #(32 - 24); \
sri RTMP3.4s, RTMP1.4s, #(32 - 24); \
eor RTMP0.16b, RTMP0.16b, RTMP2.16b; \
eor RTMP1.16b, RTMP1.16b, RTMP3.16b; \
shl RTMP2.4s, RX0.4s, #2; \
shl RTMP3.4s, RX1.4s, #2; \
sri RTMP2.4s, RX0.4s, #(32 - 2); \
sri RTMP3.4s, RX1.4s, #(32 - 2); \
eor RTMP0.16b, RTMP0.16b, RTMP2.16b; \
eor RTMP1.16b, RTMP1.16b, RTMP3.16b; \
/* s0/t0 ^= RTMP0/1 */ \
eor s0.16b, s0.16b, RTMP0.16b; \
eor t0.16b, t0.16b, RTMP1.16b;
#define SM4_CRYPT_BLK8_norotate(b0, b1, b2, b3, b4, b5, b6, b7) \
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
rev32 b4.16b, b4.16b; \
rev32 b5.16b, b5.16b; \
rev32 b6.16b, b6.16b; \
rev32 b7.16b, b7.16b; \
\
mov x6, 8; \
8: \
ld1 {RKEY.4s}, [x0], #16; \
subs x6, x6, #1; \
\
ROUND8(0, b0, b1, b2, b3, b4, b5, b6, b7); \
ROUND8(1, b1, b2, b3, b0, b5, b6, b7, b4); \
ROUND8(2, b2, b3, b0, b1, b6, b7, b4, b5); \
ROUND8(3, b3, b0, b1, b2, b7, b4, b5, b6); \
\
bne 8b; \
\
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
rev32 b4.16b, b4.16b; \
rev32 b5.16b, b5.16b; \
rev32 b6.16b, b6.16b; \
rev32 b7.16b, b7.16b; \
\
/* repoint to rkey */ \
sub x0, x0, #128;
#define SM4_CRYPT_BLK8(b0, b1, b2, b3, b4, b5, b6, b7) \
SM4_CRYPT_BLK8_norotate(b0, b1, b2, b3, b4, b5, b6, b7); \
rotate_clockwise_4x4_2x(b0, b1, b2, b3, b4, b5, b6, b7); \
.align 3
SYM_FUNC_START(sm4_neon_crypt)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* w3: nblocks
*/
SM4_PREPARE()
.Lcrypt_loop_8x:
sub w3, w3, #8
tbnz w3, #31, .Lcrypt_4x
ld4 {v0.4s-v3.4s}, [x2], #64
ld4 {v4.4s-v7.4s}, [x2], #64
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7)
st1 {v0.16b-v3.16b}, [x1], #64
st1 {v4.16b-v7.16b}, [x1], #64
cbz w3, .Lcrypt_end
b .Lcrypt_loop_8x
.Lcrypt_4x:
add w3, w3, #8
cmp w3, #4
blt .Lcrypt_tail
sub w3, w3, #4
ld4 {v0.4s-v3.4s}, [x2], #64
SM4_CRYPT_BLK4(v0, v1, v2, v3)
st1 {v0.16b-v3.16b}, [x1], #64
cbz w3, .Lcrypt_end
.Lcrypt_tail:
cmp w3, #2
ld1 {v0.16b}, [x2], #16
blt .Lcrypt_tail_load_done
ld1 {v1.16b}, [x2], #16
beq .Lcrypt_tail_load_done
ld1 {v2.16b}, [x2], #16
.Lcrypt_tail_load_done:
transpose_4x4(v0, v1, v2, v3)
SM4_CRYPT_BLK4(v0, v1, v2, v3)
cmp w3, #2
st1 {v0.16b}, [x1], #16
blt .Lcrypt_end
st1 {v1.16b}, [x1], #16
beq .Lcrypt_end
st1 {v2.16b}, [x1], #16
.Lcrypt_end:
ret
SYM_FUNC_END(sm4_neon_crypt)
.align 3
SYM_FUNC_START(sm4_neon_cbc_dec)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: iv (big endian, 128 bit)
* w4: nblocks
*/
SM4_PREPARE()
ld1 {RIV.16b}, [x3]
.Lcbc_dec_loop_8x:
sub w4, w4, #8
tbnz w4, #31, .Lcbc_dec_4x
ld4 {v0.4s-v3.4s}, [x2], #64
ld4 {v4.4s-v7.4s}, [x2]
SM4_CRYPT_BLK8_norotate(v0, v1, v2, v3, v4, v5, v6, v7)
/* Avoid overwriting the RIV register */
rotate_clockwise_4x4(v0, v1, v2, v3)
rotate_clockwise_4x4(v4, v5, v6, v7)
sub x2, x2, #64
eor v0.16b, v0.16b, RIV.16b
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64
ld1 {RTMP4.16b-RTMP7.16b}, [x2], #64
eor v1.16b, v1.16b, RTMP0.16b
eor v2.16b, v2.16b, RTMP1.16b
eor v3.16b, v3.16b, RTMP2.16b
eor v4.16b, v4.16b, RTMP3.16b
eor v5.16b, v5.16b, RTMP4.16b
eor v6.16b, v6.16b, RTMP5.16b
eor v7.16b, v7.16b, RTMP6.16b
mov RIV.16b, RTMP7.16b
st1 {v0.16b-v3.16b}, [x1], #64
st1 {v4.16b-v7.16b}, [x1], #64
cbz w4, .Lcbc_dec_end
b .Lcbc_dec_loop_8x
.Lcbc_dec_4x:
add w4, w4, #8
cmp w4, #4
blt .Lcbc_dec_tail
sub w4, w4, #4
ld1 {v0.16b-v3.16b}, [x2], #64
rev32 v4.16b, v0.16b
rev32 v5.16b, v1.16b
rev32 v6.16b, v2.16b
rev32 v7.16b, v3.16b
transpose_4x4(v4, v5, v6, v7)
SM4_CRYPT_BLK4_BE(v4, v5, v6, v7)
eor v4.16b, v4.16b, RIV.16b
eor v5.16b, v5.16b, v0.16b
eor v6.16b, v6.16b, v1.16b
eor v7.16b, v7.16b, v2.16b
mov RIV.16b, v3.16b
st1 {v4.16b-v7.16b}, [x1], #64
cbz w4, .Lcbc_dec_end
.Lcbc_dec_tail:
cmp w4, #2
ld1 {v0.16b}, [x2], #16
blt .Lcbc_dec_tail_load_done
ld1 {v1.16b}, [x2], #16
beq .Lcbc_dec_tail_load_done
ld1 {v2.16b}, [x2], #16
.Lcbc_dec_tail_load_done:
rev32 v4.16b, v0.16b
rev32 v5.16b, v1.16b
rev32 v6.16b, v2.16b
transpose_4x4(v4, v5, v6, v7)
SM4_CRYPT_BLK4_BE(v4, v5, v6, v7)
cmp w4, #2
eor v4.16b, v4.16b, RIV.16b
mov RIV.16b, v0.16b
st1 {v4.16b}, [x1], #16
blt .Lcbc_dec_end
eor v5.16b, v5.16b, v0.16b
mov RIV.16b, v1.16b
st1 {v5.16b}, [x1], #16
beq .Lcbc_dec_end
eor v6.16b, v6.16b, v1.16b
mov RIV.16b, v2.16b
st1 {v6.16b}, [x1], #16
.Lcbc_dec_end:
/* store new IV */
st1 {RIV.16b}, [x3]
ret
SYM_FUNC_END(sm4_neon_cbc_dec)
.align 3
SYM_FUNC_START(sm4_neon_ctr_crypt)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: ctr (big endian, 128 bit)
* w4: nblocks
*/
SM4_PREPARE()
ldp x7, x8, [x3]
rev x7, x7
rev x8, x8
.Lctr_crypt_loop_8x:
sub w4, w4, #8
tbnz w4, #31, .Lctr_crypt_4x
#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;
/* construct CTRs */
inc_le128(v0) /* +0 */
inc_le128(v1) /* +1 */
inc_le128(v2) /* +2 */
inc_le128(v3) /* +3 */
inc_le128(v4) /* +4 */
inc_le128(v5) /* +5 */
inc_le128(v6) /* +6 */
inc_le128(v7) /* +7 */
transpose_4x4_2x(v0, v1, v2, v3, v4, v5, v6, v7)
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7)
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64
ld1 {RTMP4.16b-RTMP7.16b}, [x2], #64
eor v0.16b, v0.16b, RTMP0.16b
eor v1.16b, v1.16b, RTMP1.16b
eor v2.16b, v2.16b, RTMP2.16b
eor v3.16b, v3.16b, RTMP3.16b
eor v4.16b, v4.16b, RTMP4.16b
eor v5.16b, v5.16b, RTMP5.16b
eor v6.16b, v6.16b, RTMP6.16b
eor v7.16b, v7.16b, RTMP7.16b
st1 {v0.16b-v3.16b}, [x1], #64
st1 {v4.16b-v7.16b}, [x1], #64
cbz w4, .Lctr_crypt_end
b .Lctr_crypt_loop_8x
.Lctr_crypt_4x:
add w4, w4, #8
cmp w4, #4
blt .Lctr_crypt_tail
sub w4, w4, #4
/* construct CTRs */
inc_le128(v0) /* +0 */
inc_le128(v1) /* +1 */
inc_le128(v2) /* +2 */
inc_le128(v3) /* +3 */
ld1 {v4.16b-v7.16b}, [x2], #64
transpose_4x4(v0, v1, v2, v3)
SM4_CRYPT_BLK4(v0, v1, v2, v3)
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
eor v3.16b, v3.16b, v7.16b
st1 {v0.16b-v3.16b}, [x1], #64
cbz w4, .Lctr_crypt_end
.Lctr_crypt_tail:
/* inc_le128 will change the sign bit */
ld1 {v4.16b}, [x2], #16
inc_le128(v0)
cmp w4, #2
blt .Lctr_crypt_tail_load_done
ld1 {v5.16b}, [x2], #16
inc_le128(v1)
cmp w4, #2
beq .Lctr_crypt_tail_load_done
ld1 {v6.16b}, [x2], #16
inc_le128(v2)
.Lctr_crypt_tail_load_done:
transpose_4x4(v0, v1, v2, v3)
SM4_CRYPT_BLK4(v0, v1, v2, v3)
cmp w4, #2
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x1], #16
blt .Lctr_crypt_end
eor v1.16b, v1.16b, v5.16b
st1 {v1.16b}, [x1], #16
beq .Lctr_crypt_end
eor v2.16b, v2.16b, v6.16b
st1 {v2.16b}, [x1], #16
.Lctr_crypt_end:
/* store new CTR */
rev x7, x7
rev x8, x8
stp x7, x8, [x3]
ret
SYM_FUNC_END(sm4_neon_ctr_crypt)
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