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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 RX0 v12
#define RX1 v13
#define RKEY v14
#define RIV v15
/* Helper macros. */
#define 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 rotate_clockwise_90(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 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(b0, b1, b2, b3) \
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
\
transpose_4x4(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; \
\
rotate_clockwise_90(b0, b1, b2, b3); \
rev32 b0.16b, b0.16b; \
rev32 b1.16b, b1.16b; \
rev32 b2.16b, b2.16b; \
rev32 b3.16b, b3.16b; \
\
/* repoint to rkey */ \
sub x0, x0, #128;
#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(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; \
\
transpose_4x4(b0, b1, b2, b3); \
transpose_4x4(b4, b5, b6, b7); \
\
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; \
\
rotate_clockwise_90(b0, b1, b2, b3); \
rotate_clockwise_90(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; \
\
/* repoint to rkey */ \
sub x0, x0, #128;
.align 3
SYM_FUNC_START_LOCAL(__sm4_neon_crypt_blk1_4)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* w3: num blocks (1..4)
*/
PREPARE;
ld1 {v0.16b}, [x2], #16;
mov v1.16b, v0.16b;
mov v2.16b, v0.16b;
mov v3.16b, v0.16b;
cmp w3, #2;
blt .Lblk4_load_input_done;
ld1 {v1.16b}, [x2], #16;
beq .Lblk4_load_input_done;
ld1 {v2.16b}, [x2], #16;
cmp w3, #3;
beq .Lblk4_load_input_done;
ld1 {v3.16b}, [x2];
.Lblk4_load_input_done:
SM4_CRYPT_BLK4(v0, v1, v2, v3);
st1 {v0.16b}, [x1], #16;
cmp w3, #2;
blt .Lblk4_store_output_done;
st1 {v1.16b}, [x1], #16;
beq .Lblk4_store_output_done;
st1 {v2.16b}, [x1], #16;
cmp w3, #3;
beq .Lblk4_store_output_done;
st1 {v3.16b}, [x1];
.Lblk4_store_output_done:
ret;
SYM_FUNC_END(__sm4_neon_crypt_blk1_4)
.align 3
SYM_FUNC_START(sm4_neon_crypt_blk1_8)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* w3: num blocks (1..8)
*/
cmp w3, #5;
blt __sm4_neon_crypt_blk1_4;
PREPARE;
ld1 {v0.16b-v3.16b}, [x2], #64;
ld1 {v4.16b}, [x2], #16;
mov v5.16b, v4.16b;
mov v6.16b, v4.16b;
mov v7.16b, v4.16b;
beq .Lblk8_load_input_done;
ld1 {v5.16b}, [x2], #16;
cmp w3, #7;
blt .Lblk8_load_input_done;
ld1 {v6.16b}, [x2], #16;
beq .Lblk8_load_input_done;
ld1 {v7.16b}, [x2];
.Lblk8_load_input_done:
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7);
cmp w3, #6;
st1 {v0.16b-v3.16b}, [x1], #64;
st1 {v4.16b}, [x1], #16;
blt .Lblk8_store_output_done;
st1 {v5.16b}, [x1], #16;
beq .Lblk8_store_output_done;
st1 {v6.16b}, [x1], #16;
cmp w3, #7;
beq .Lblk8_store_output_done;
st1 {v7.16b}, [x1];
.Lblk8_store_output_done:
ret;
SYM_FUNC_END(sm4_neon_crypt_blk1_8)
.align 3
SYM_FUNC_START(sm4_neon_crypt_blk8)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* w3: nblocks (multiples of 8)
*/
PREPARE;
.Lcrypt_loop_blk:
subs w3, w3, #8;
bmi .Lcrypt_end;
ld1 {v0.16b-v3.16b}, [x2], #64;
ld1 {v4.16b-v7.16b}, [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;
b .Lcrypt_loop_blk;
.Lcrypt_end:
ret;
SYM_FUNC_END(sm4_neon_crypt_blk8)
.align 3
SYM_FUNC_START(sm4_neon_cbc_dec_blk8)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: iv (big endian, 128 bit)
* w4: nblocks (multiples of 8)
*/
PREPARE;
ld1 {RIV.16b}, [x3];
.Lcbc_loop_blk:
subs w4, w4, #8;
bmi .Lcbc_end;
ld1 {v0.16b-v3.16b}, [x2], #64;
ld1 {v4.16b-v7.16b}, [x2];
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7);
sub x2, x2, #64;
eor v0.16b, v0.16b, RIV.16b;
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64;
eor v1.16b, v1.16b, RTMP0.16b;
eor v2.16b, v2.16b, RTMP1.16b;
eor v3.16b, v3.16b, RTMP2.16b;
st1 {v0.16b-v3.16b}, [x1], #64;
eor v4.16b, v4.16b, RTMP3.16b;
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64;
eor v5.16b, v5.16b, RTMP0.16b;
eor v6.16b, v6.16b, RTMP1.16b;
eor v7.16b, v7.16b, RTMP2.16b;
mov RIV.16b, RTMP3.16b;
st1 {v4.16b-v7.16b}, [x1], #64;
b .Lcbc_loop_blk;
.Lcbc_end:
/* store new IV */
st1 {RIV.16b}, [x3];
ret;
SYM_FUNC_END(sm4_neon_cbc_dec_blk8)
.align 3
SYM_FUNC_START(sm4_neon_cfb_dec_blk8)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: iv (big endian, 128 bit)
* w4: nblocks (multiples of 8)
*/
PREPARE;
ld1 {v0.16b}, [x3];
.Lcfb_loop_blk:
subs w4, w4, #8;
bmi .Lcfb_end;
ld1 {v1.16b, v2.16b, v3.16b}, [x2], #48;
ld1 {v4.16b-v7.16b}, [x2];
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7);
sub x2, x2, #48;
ld1 {RTMP0.16b-RTMP3.16b}, [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;
st1 {v0.16b-v3.16b}, [x1], #64;
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64;
eor v4.16b, v4.16b, RTMP0.16b;
eor v5.16b, v5.16b, RTMP1.16b;
eor v6.16b, v6.16b, RTMP2.16b;
eor v7.16b, v7.16b, RTMP3.16b;
st1 {v4.16b-v7.16b}, [x1], #64;
mov v0.16b, RTMP3.16b;
b .Lcfb_loop_blk;
.Lcfb_end:
/* store new IV */
st1 {v0.16b}, [x3];
ret;
SYM_FUNC_END(sm4_neon_cfb_dec_blk8)
.align 3
SYM_FUNC_START(sm4_neon_ctr_enc_blk8)
/* input:
* x0: round key array, CTX
* x1: dst
* x2: src
* x3: ctr (big endian, 128 bit)
* w4: nblocks (multiples of 8)
*/
PREPARE;
ldp x7, x8, [x3];
rev x7, x7;
rev x8, x8;
.Lctr_loop_blk:
subs w4, w4, #8;
bmi .Lctr_end;
#define inc_le128(vctr) \
mov vctr.d[1], x8; \
mov vctr.d[0], x7; \
adds x8, x8, #1; \
adc x7, x7, xzr; \
rev64 vctr.16b, vctr.16b;
/* 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 */
SM4_CRYPT_BLK8(v0, v1, v2, v3, v4, v5, v6, v7);
ld1 {RTMP0.16b-RTMP3.16b}, [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;
st1 {v0.16b-v3.16b}, [x1], #64;
ld1 {RTMP0.16b-RTMP3.16b}, [x2], #64;
eor v4.16b, v4.16b, RTMP0.16b;
eor v5.16b, v5.16b, RTMP1.16b;
eor v6.16b, v6.16b, RTMP2.16b;
eor v7.16b, v7.16b, RTMP3.16b;
st1 {v4.16b-v7.16b}, [x1], #64;
b .Lctr_loop_blk;
.Lctr_end:
/* store new CTR */
rev x7, x7;
rev x8, x8;
stp x7, x8, [x3];
ret;
SYM_FUNC_END(sm4_neon_ctr_enc_blk8)
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