xref: /openbmc/linux/arch/arm64/crypto/aes-ce.S (revision b8e50548)
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/arm64/crypto/aes-ce.S - AES cipher for ARMv8 with
4 *                                    Crypto Extensions
5 *
6 * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
7 */
8
9#include <linux/linkage.h>
10#include <asm/assembler.h>
11
12#define AES_FUNC_START(func)		SYM_FUNC_START(ce_ ## func)
13#define AES_FUNC_END(func)		SYM_FUNC_END(ce_ ## func)
14
15	.arch		armv8-a+crypto
16
17	xtsmask		.req	v16
18	cbciv		.req	v16
19	vctr		.req	v16
20
21	.macro		xts_reload_mask, tmp
22	.endm
23
24	.macro		xts_cts_skip_tw, reg, lbl
25	.endm
26
27	/* preload all round keys */
28	.macro		load_round_keys, rounds, rk
29	cmp		\rounds, #12
30	blo		2222f		/* 128 bits */
31	beq		1111f		/* 192 bits */
32	ld1		{v17.4s-v18.4s}, [\rk], #32
331111:	ld1		{v19.4s-v20.4s}, [\rk], #32
342222:	ld1		{v21.4s-v24.4s}, [\rk], #64
35	ld1		{v25.4s-v28.4s}, [\rk], #64
36	ld1		{v29.4s-v31.4s}, [\rk]
37	.endm
38
39	/* prepare for encryption with key in rk[] */
40	.macro		enc_prepare, rounds, rk, temp
41	mov		\temp, \rk
42	load_round_keys	\rounds, \temp
43	.endm
44
45	/* prepare for encryption (again) but with new key in rk[] */
46	.macro		enc_switch_key, rounds, rk, temp
47	mov		\temp, \rk
48	load_round_keys	\rounds, \temp
49	.endm
50
51	/* prepare for decryption with key in rk[] */
52	.macro		dec_prepare, rounds, rk, temp
53	mov		\temp, \rk
54	load_round_keys	\rounds, \temp
55	.endm
56
57	.macro		do_enc_Nx, de, mc, k, i0, i1, i2, i3, i4
58	aes\de		\i0\().16b, \k\().16b
59	aes\mc		\i0\().16b, \i0\().16b
60	.ifnb		\i1
61	aes\de		\i1\().16b, \k\().16b
62	aes\mc		\i1\().16b, \i1\().16b
63	.ifnb		\i3
64	aes\de		\i2\().16b, \k\().16b
65	aes\mc		\i2\().16b, \i2\().16b
66	aes\de		\i3\().16b, \k\().16b
67	aes\mc		\i3\().16b, \i3\().16b
68	.ifnb		\i4
69	aes\de		\i4\().16b, \k\().16b
70	aes\mc		\i4\().16b, \i4\().16b
71	.endif
72	.endif
73	.endif
74	.endm
75
76	/* up to 5 interleaved encryption rounds with the same round key */
77	.macro		round_Nx, enc, k, i0, i1, i2, i3, i4
78	.ifc		\enc, e
79	do_enc_Nx	e, mc, \k, \i0, \i1, \i2, \i3, \i4
80	.else
81	do_enc_Nx	d, imc, \k, \i0, \i1, \i2, \i3, \i4
82	.endif
83	.endm
84
85	/* up to 5 interleaved final rounds */
86	.macro		fin_round_Nx, de, k, k2, i0, i1, i2, i3, i4
87	aes\de		\i0\().16b, \k\().16b
88	.ifnb		\i1
89	aes\de		\i1\().16b, \k\().16b
90	.ifnb		\i3
91	aes\de		\i2\().16b, \k\().16b
92	aes\de		\i3\().16b, \k\().16b
93	.ifnb		\i4
94	aes\de		\i4\().16b, \k\().16b
95	.endif
96	.endif
97	.endif
98	eor		\i0\().16b, \i0\().16b, \k2\().16b
99	.ifnb		\i1
100	eor		\i1\().16b, \i1\().16b, \k2\().16b
101	.ifnb		\i3
102	eor		\i2\().16b, \i2\().16b, \k2\().16b
103	eor		\i3\().16b, \i3\().16b, \k2\().16b
104	.ifnb		\i4
105	eor		\i4\().16b, \i4\().16b, \k2\().16b
106	.endif
107	.endif
108	.endif
109	.endm
110
111	/* up to 5 interleaved blocks */
112	.macro		do_block_Nx, enc, rounds, i0, i1, i2, i3, i4
113	cmp		\rounds, #12
114	blo		2222f		/* 128 bits */
115	beq		1111f		/* 192 bits */
116	round_Nx	\enc, v17, \i0, \i1, \i2, \i3, \i4
117	round_Nx	\enc, v18, \i0, \i1, \i2, \i3, \i4
1181111:	round_Nx	\enc, v19, \i0, \i1, \i2, \i3, \i4
119	round_Nx	\enc, v20, \i0, \i1, \i2, \i3, \i4
1202222:	.irp		key, v21, v22, v23, v24, v25, v26, v27, v28, v29
121	round_Nx	\enc, \key, \i0, \i1, \i2, \i3, \i4
122	.endr
123	fin_round_Nx	\enc, v30, v31, \i0, \i1, \i2, \i3, \i4
124	.endm
125
126	.macro		encrypt_block, in, rounds, t0, t1, t2
127	do_block_Nx	e, \rounds, \in
128	.endm
129
130	.macro		encrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
131	do_block_Nx	e, \rounds, \i0, \i1, \i2, \i3
132	.endm
133
134	.macro		encrypt_block5x, i0, i1, i2, i3, i4, rounds, t0, t1, t2
135	do_block_Nx	e, \rounds, \i0, \i1, \i2, \i3, \i4
136	.endm
137
138	.macro		decrypt_block, in, rounds, t0, t1, t2
139	do_block_Nx	d, \rounds, \in
140	.endm
141
142	.macro		decrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
143	do_block_Nx	d, \rounds, \i0, \i1, \i2, \i3
144	.endm
145
146	.macro		decrypt_block5x, i0, i1, i2, i3, i4, rounds, t0, t1, t2
147	do_block_Nx	d, \rounds, \i0, \i1, \i2, \i3, \i4
148	.endm
149
150#define MAX_STRIDE	5
151
152#include "aes-modes.S"
153