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gerrit-public.fairphone.software / kernel / msm-4.19 / 49788fe2a128217f78a21ee4edbe6e92e988f222 / . / arch / arm64 / crypto / aes-ce.S
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Ard Biesheuvel49788fe2014-03-21 10:19:17 +0100[diff] [blame^]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 .ifnb \i1
49 aes\de \i1\().16b, \k\().16b
50 .ifnb \i3
51 aes\de \i2\().16b, \k\().16b
52 aes\de \i3\().16b, \k\().16b
53 .endif
54 .endif
55 aes\mc \i0\().16b, \i0\().16b
56 .ifnb \i1
57 aes\mc \i1\().16b, \i1\().16b
58 .ifnb \i3
59 aes\mc \i2\().16b, \i2\().16b
60 aes\mc \i3\().16b, \i3\().16b
61 .endif
62 .endif
63 .endm
64
65 /* up to 4 interleaved encryption rounds with the same round key */
66 .macro round_Nx, enc, k, i0, i1, i2, i3
67 .ifc \enc, e
68 do_enc_Nx e, mc, \k, \i0, \i1, \i2, \i3
69 .else
70 do_enc_Nx d, imc, \k, \i0, \i1, \i2, \i3
71 .endif
72 .endm
73
74 /* up to 4 interleaved final rounds */
75 .macro fin_round_Nx, de, k, k2, i0, i1, i2, i3
76 aes\de \i0\().16b, \k\().16b
77 .ifnb \i1
78 aes\de \i1\().16b, \k\().16b
79 .ifnb \i3
80 aes\de \i2\().16b, \k\().16b
81 aes\de \i3\().16b, \k\().16b
82 .endif
83 .endif
84 eor \i0\().16b, \i0\().16b, \k2\().16b
85 .ifnb \i1
86 eor \i1\().16b, \i1\().16b, \k2\().16b
87 .ifnb \i3
88 eor \i2\().16b, \i2\().16b, \k2\().16b
89 eor \i3\().16b, \i3\().16b, \k2\().16b
90 .endif
91 .endif
92 .endm
93
94 /* up to 4 interleaved blocks */
95 .macro do_block_Nx, enc, rounds, i0, i1, i2, i3
96 cmp \rounds, #12
97 blo 2222f /* 128 bits */
98 beq 1111f /* 192 bits */
99 round_Nx \enc, v17, \i0, \i1, \i2, \i3
100 round_Nx \enc, v18, \i0, \i1, \i2, \i3
1011111: round_Nx \enc, v19, \i0, \i1, \i2, \i3
102 round_Nx \enc, v20, \i0, \i1, \i2, \i3
1032222: .irp key, v21, v22, v23, v24, v25, v26, v27, v28, v29
104 round_Nx \enc, \key, \i0, \i1, \i2, \i3
105 .endr
106 fin_round_Nx \enc, v30, v31, \i0, \i1, \i2, \i3
107 .endm
108
109 .macro encrypt_block, in, rounds, t0, t1, t2
110 do_block_Nx e, \rounds, \in
111 .endm
112
113 .macro encrypt_block2x, i0, i1, rounds, t0, t1, t2
114 do_block_Nx e, \rounds, \i0, \i1
115 .endm
116
117 .macro encrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
118 do_block_Nx e, \rounds, \i0, \i1, \i2, \i3
119 .endm
120
121 .macro decrypt_block, in, rounds, t0, t1, t2
122 do_block_Nx d, \rounds, \in
123 .endm
124
125 .macro decrypt_block2x, i0, i1, rounds, t0, t1, t2
126 do_block_Nx d, \rounds, \i0, \i1
127 .endm
128
129 .macro decrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
130 do_block_Nx d, \rounds, \i0, \i1, \i2, \i3
131 .endm
132
133#include "aes-modes.S"