xref: /linux/arch/arm64/crypto/aes-ce.S (revision b85d45947951d23cb22d90caecf4c1eb81342c96) 
1/*
2 * linux/arch/arm64/crypto/aes-ce.S - AES cipher for ARMv8 with
3 *                                    Crypto Extensions
4 *
5 * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/linkage.h>
13
14#define AES_ENTRY(func)		ENTRY(ce_ ## func)
15#define AES_ENDPROC(func)	ENDPROC(ce_ ## func)
16
17	.arch		armv8-a+crypto
18
19	/* preload all round keys */
20	.macro		load_round_keys, rounds, rk
21	cmp		\rounds, #12
22	blo		2222f		/* 128 bits */
23	beq		1111f		/* 192 bits */
24	ld1		{v17.16b-v18.16b}, [\rk], #32
251111:	ld1		{v19.16b-v20.16b}, [\rk], #32
262222:	ld1		{v21.16b-v24.16b}, [\rk], #64
27	ld1		{v25.16b-v28.16b}, [\rk], #64
28	ld1		{v29.16b-v31.16b}, [\rk]
29	.endm
30
31	/* prepare for encryption with key in rk[] */
32	.macro		enc_prepare, rounds, rk, ignore
33	load_round_keys	\rounds, \rk
34	.endm
35
36	/* prepare for encryption (again) but with new key in rk[] */
37	.macro		enc_switch_key, rounds, rk, ignore
38	load_round_keys	\rounds, \rk
39	.endm
40
41	/* prepare for decryption with key in rk[] */
42	.macro		dec_prepare, rounds, rk, ignore
43	load_round_keys	\rounds, \rk
44	.endm
45
46	.macro		do_enc_Nx, de, mc, k, i0, i1, i2, i3
47	aes\de		\i0\().16b, \k\().16b
48	aes\mc		\i0\().16b, \i0\().16b
49	.ifnb		\i1
50	aes\de		\i1\().16b, \k\().16b
51	aes\mc		\i1\().16b, \i1\().16b
52	.ifnb		\i3
53	aes\de		\i2\().16b, \k\().16b
54	aes\mc		\i2\().16b, \i2\().16b
55	aes\de		\i3\().16b, \k\().16b
56	aes\mc		\i3\().16b, \i3\().16b
57	.endif
58	.endif
59	.endm
60
61	/* up to 4 interleaved encryption rounds with the same round key */
62	.macro		round_Nx, enc, k, i0, i1, i2, i3
63	.ifc		\enc, e
64	do_enc_Nx	e, mc, \k, \i0, \i1, \i2, \i3
65	.else
66	do_enc_Nx	d, imc, \k, \i0, \i1, \i2, \i3
67	.endif
68	.endm
69
70	/* up to 4 interleaved final rounds */
71	.macro		fin_round_Nx, de, k, k2, i0, i1, i2, i3
72	aes\de		\i0\().16b, \k\().16b
73	.ifnb		\i1
74	aes\de		\i1\().16b, \k\().16b
75	.ifnb		\i3
76	aes\de		\i2\().16b, \k\().16b
77	aes\de		\i3\().16b, \k\().16b
78	.endif
79	.endif
80	eor		\i0\().16b, \i0\().16b, \k2\().16b
81	.ifnb		\i1
82	eor		\i1\().16b, \i1\().16b, \k2\().16b
83	.ifnb		\i3
84	eor		\i2\().16b, \i2\().16b, \k2\().16b
85	eor		\i3\().16b, \i3\().16b, \k2\().16b
86	.endif
87	.endif
88	.endm
89
90	/* up to 4 interleaved blocks */
91	.macro		do_block_Nx, enc, rounds, i0, i1, i2, i3
92	cmp		\rounds, #12
93	blo		2222f		/* 128 bits */
94	beq		1111f		/* 192 bits */
95	round_Nx	\enc, v17, \i0, \i1, \i2, \i3
96	round_Nx	\enc, v18, \i0, \i1, \i2, \i3
971111:	round_Nx	\enc, v19, \i0, \i1, \i2, \i3
98	round_Nx	\enc, v20, \i0, \i1, \i2, \i3
992222:	.irp		key, v21, v22, v23, v24, v25, v26, v27, v28, v29
100	round_Nx	\enc, \key, \i0, \i1, \i2, \i3
101	.endr
102	fin_round_Nx	\enc, v30, v31, \i0, \i1, \i2, \i3
103	.endm
104
105	.macro		encrypt_block, in, rounds, t0, t1, t2
106	do_block_Nx	e, \rounds, \in
107	.endm
108
109	.macro		encrypt_block2x, i0, i1, rounds, t0, t1, t2
110	do_block_Nx	e, \rounds, \i0, \i1
111	.endm
112
113	.macro		encrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
114	do_block_Nx	e, \rounds, \i0, \i1, \i2, \i3
115	.endm
116
117	.macro		decrypt_block, in, rounds, t0, t1, t2
118	do_block_Nx	d, \rounds, \in
119	.endm
120
121	.macro		decrypt_block2x, i0, i1, rounds, t0, t1, t2
122	do_block_Nx	d, \rounds, \i0, \i1
123	.endm
124
125	.macro		decrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
126	do_block_Nx	d, \rounds, \i0, \i1, \i2, \i3
127	.endm
128
129#include "aes-modes.S"
130