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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AES routines supporting VMX instructions on the Power 8
4 *
5 * Copyright (C) 2015 International Business Machines Inc.
6 *
7 * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
8 */
9
10#include <linux/types.h>
11#include <linux/err.h>
12#include <linux/crypto.h>
13#include <linux/delay.h>
14#include <asm/simd.h>
15#include <asm/switch_to.h>
16#include <crypto/aes.h>
17#include <crypto/internal/cipher.h>
18#include <crypto/internal/simd.h>
19
20#include "aesp8-ppc.h"
21
22struct p8_aes_ctx {
23 struct crypto_cipher *fallback;
24 struct aes_key enc_key;
25 struct aes_key dec_key;
26};
27
28static int p8_aes_init(struct crypto_tfm *tfm)
29{
30 const char *alg = crypto_tfm_alg_name(tfm);
31 struct crypto_cipher *fallback;
32 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
33
34 fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
35 if (IS_ERR(fallback)) {
36 printk(KERN_ERR
37 "Failed to allocate transformation for '%s': %ld\n",
38 alg, PTR_ERR(fallback));
39 return PTR_ERR(fallback);
40 }
41
42 crypto_cipher_set_flags(fallback,
43 crypto_cipher_get_flags((struct
44 crypto_cipher *)
45 tfm));
46 ctx->fallback = fallback;
47
48 return 0;
49}
50
51static void p8_aes_exit(struct crypto_tfm *tfm)
52{
53 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
54
55 if (ctx->fallback) {
56 crypto_free_cipher(ctx->fallback);
57 ctx->fallback = NULL;
58 }
59}
60
61static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
62 unsigned int keylen)
63{
64 int ret;
65 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
66
67 preempt_disable();
68 pagefault_disable();
69 enable_kernel_vsx();
70 ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
71 ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
72 disable_kernel_vsx();
73 pagefault_enable();
74 preempt_enable();
75
76 ret |= crypto_cipher_setkey(ctx->fallback, key, keylen);
77
78 return ret ? -EINVAL : 0;
79}
80
81static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
82{
83 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
84
85 if (!crypto_simd_usable()) {
86 crypto_cipher_encrypt_one(ctx->fallback, dst, src);
87 } else {
88 preempt_disable();
89 pagefault_disable();
90 enable_kernel_vsx();
91 aes_p8_encrypt(src, dst, &ctx->enc_key);
92 disable_kernel_vsx();
93 pagefault_enable();
94 preempt_enable();
95 }
96}
97
98static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
99{
100 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
101
102 if (!crypto_simd_usable()) {
103 crypto_cipher_decrypt_one(ctx->fallback, dst, src);
104 } else {
105 preempt_disable();
106 pagefault_disable();
107 enable_kernel_vsx();
108 aes_p8_decrypt(src, dst, &ctx->dec_key);
109 disable_kernel_vsx();
110 pagefault_enable();
111 preempt_enable();
112 }
113}
114
115struct crypto_alg p8_aes_alg = {
116 .cra_name = "aes",
117 .cra_driver_name = "p8_aes",
118 .cra_module = THIS_MODULE,
119 .cra_priority = 1000,
120 .cra_type = NULL,
121 .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
122 .cra_alignmask = 0,
123 .cra_blocksize = AES_BLOCK_SIZE,
124 .cra_ctxsize = sizeof(struct p8_aes_ctx),
125 .cra_init = p8_aes_init,
126 .cra_exit = p8_aes_exit,
127 .cra_cipher = {
128 .cia_min_keysize = AES_MIN_KEY_SIZE,
129 .cia_max_keysize = AES_MAX_KEY_SIZE,
130 .cia_setkey = p8_aes_setkey,
131 .cia_encrypt = p8_aes_encrypt,
132 .cia_decrypt = p8_aes_decrypt,
133 },
134};
1/**
2 * AES routines supporting VMX instructions on the Power 8
3 *
4 * Copyright (C) 2015 International Business Machines Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 only.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
20 */
21
22#include <linux/types.h>
23#include <linux/err.h>
24#include <linux/crypto.h>
25#include <linux/delay.h>
26#include <linux/hardirq.h>
27#include <asm/switch_to.h>
28#include <crypto/aes.h>
29
30#include "aesp8-ppc.h"
31
32struct p8_aes_ctx {
33 struct crypto_cipher *fallback;
34 struct aes_key enc_key;
35 struct aes_key dec_key;
36};
37
38static int p8_aes_init(struct crypto_tfm *tfm)
39{
40 const char *alg;
41 struct crypto_cipher *fallback;
42 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
43
44 if (!(alg = crypto_tfm_alg_name(tfm))) {
45 printk(KERN_ERR "Failed to get algorithm name.\n");
46 return -ENOENT;
47 }
48
49 fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
50 if (IS_ERR(fallback)) {
51 printk(KERN_ERR
52 "Failed to allocate transformation for '%s': %ld\n",
53 alg, PTR_ERR(fallback));
54 return PTR_ERR(fallback);
55 }
56 printk(KERN_INFO "Using '%s' as fallback implementation.\n",
57 crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));
58
59 crypto_cipher_set_flags(fallback,
60 crypto_cipher_get_flags((struct
61 crypto_cipher *)
62 tfm));
63 ctx->fallback = fallback;
64
65 return 0;
66}
67
68static void p8_aes_exit(struct crypto_tfm *tfm)
69{
70 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
71
72 if (ctx->fallback) {
73 crypto_free_cipher(ctx->fallback);
74 ctx->fallback = NULL;
75 }
76}
77
78static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
79 unsigned int keylen)
80{
81 int ret;
82 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
83
84 preempt_disable();
85 pagefault_disable();
86 enable_kernel_vsx();
87 ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
88 ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
89 disable_kernel_vsx();
90 pagefault_enable();
91 preempt_enable();
92
93 ret += crypto_cipher_setkey(ctx->fallback, key, keylen);
94 return ret;
95}
96
97static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
98{
99 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
100
101 if (in_interrupt()) {
102 crypto_cipher_encrypt_one(ctx->fallback, dst, src);
103 } else {
104 preempt_disable();
105 pagefault_disable();
106 enable_kernel_vsx();
107 aes_p8_encrypt(src, dst, &ctx->enc_key);
108 disable_kernel_vsx();
109 pagefault_enable();
110 preempt_enable();
111 }
112}
113
114static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
115{
116 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
117
118 if (in_interrupt()) {
119 crypto_cipher_decrypt_one(ctx->fallback, dst, src);
120 } else {
121 preempt_disable();
122 pagefault_disable();
123 enable_kernel_vsx();
124 aes_p8_decrypt(src, dst, &ctx->dec_key);
125 disable_kernel_vsx();
126 pagefault_enable();
127 preempt_enable();
128 }
129}
130
131struct crypto_alg p8_aes_alg = {
132 .cra_name = "aes",
133 .cra_driver_name = "p8_aes",
134 .cra_module = THIS_MODULE,
135 .cra_priority = 1000,
136 .cra_type = NULL,
137 .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
138 .cra_alignmask = 0,
139 .cra_blocksize = AES_BLOCK_SIZE,
140 .cra_ctxsize = sizeof(struct p8_aes_ctx),
141 .cra_init = p8_aes_init,
142 .cra_exit = p8_aes_exit,
143 .cra_cipher = {
144 .cia_min_keysize = AES_MIN_KEY_SIZE,
145 .cia_max_keysize = AES_MAX_KEY_SIZE,
146 .cia_setkey = p8_aes_setkey,
147 .cia_encrypt = p8_aes_encrypt,
148 .cia_decrypt = p8_aes_decrypt,
149 },
150};