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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/crypto/vmx/aes_cbc.c
....@@ -1,33 +1,17 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /**
23  * AES CBC routines supporting VMX instructions on the Power 8
34  *
45  * Copyright (C) 2015 International Business Machines Inc.
56  *
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
- *
197  * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
208  */
219 
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>
10
+#include <asm/simd.h>
2711 #include <asm/switch_to.h>
2812 #include <crypto/aes.h>
29
-#include <crypto/scatterwalk.h>
30
-#include <crypto/skcipher.h>
13
+#include <crypto/internal/simd.h>
14
+#include <crypto/internal/skcipher.h>
3115 
3216 #include "aesp8-ppc.h"
3317 
....@@ -37,156 +21,113 @@
3721 	struct aes_key dec_key;
3822 };
3923 
40
-static int p8_aes_cbc_init(struct crypto_tfm *tfm)
24
+static int p8_aes_cbc_init(struct crypto_skcipher *tfm)
4125 {
42
-	const char *alg = crypto_tfm_alg_name(tfm);
26
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
4327 	struct crypto_skcipher *fallback;
44
-	struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
4528 
46
-	fallback = crypto_alloc_skcipher(alg, 0,
47
-			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
48
-
29
+	fallback = crypto_alloc_skcipher("cbc(aes)", 0,
30
+					 CRYPTO_ALG_NEED_FALLBACK |
31
+					 CRYPTO_ALG_ASYNC);
4932 	if (IS_ERR(fallback)) {
50
-		printk(KERN_ERR
51
-		       "Failed to allocate transformation for '%s': %ld\n",
52
-		       alg, PTR_ERR(fallback));
33
+		pr_err("Failed to allocate cbc(aes) fallback: %ld\n",
34
+		       PTR_ERR(fallback));
5335 		return PTR_ERR(fallback);
5436 	}
5537 
56
-	crypto_skcipher_set_flags(
57
-		fallback,
58
-		crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
38
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
39
+				    crypto_skcipher_reqsize(fallback));
5940 	ctx->fallback = fallback;
60
-
6141 	return 0;
6242 }
6343 
64
-static void p8_aes_cbc_exit(struct crypto_tfm *tfm)
44
+static void p8_aes_cbc_exit(struct crypto_skcipher *tfm)
6545 {
66
-	struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
46
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
6747 
68
-	if (ctx->fallback) {
69
-		crypto_free_skcipher(ctx->fallback);
70
-		ctx->fallback = NULL;
71
-	}
48
+	crypto_free_skcipher(ctx->fallback);
7249 }
7350 
74
-static int p8_aes_cbc_setkey(struct crypto_tfm *tfm, const u8 *key,
51
+static int p8_aes_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key,
7552 			     unsigned int keylen)
7653 {
54
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
7755 	int ret;
78
-	struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
7956 
8057 	preempt_disable();
8158 	pagefault_disable();
8259 	enable_kernel_vsx();
8360 	ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
84
-	ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
61
+	ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
8562 	disable_kernel_vsx();
8663 	pagefault_enable();
8764 	preempt_enable();
8865 
89
-	ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
90
-	return ret;
66
+	ret |= crypto_skcipher_setkey(ctx->fallback, key, keylen);
67
+
68
+	return ret ? -EINVAL : 0;
9169 }
9270 
93
-static int p8_aes_cbc_encrypt(struct blkcipher_desc *desc,
94
-			      struct scatterlist *dst,
95
-			      struct scatterlist *src, unsigned int nbytes)
71
+static int p8_aes_cbc_crypt(struct skcipher_request *req, int enc)
9672 {
73
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
74
+	const struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
75
+	struct skcipher_walk walk;
76
+	unsigned int nbytes;
9777 	int ret;
98
-	struct blkcipher_walk walk;
99
-	struct p8_aes_cbc_ctx *ctx =
100
-		crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
10178 
102
-	if (in_interrupt()) {
103
-		SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
104
-		skcipher_request_set_tfm(req, ctx->fallback);
105
-		skcipher_request_set_callback(req, desc->flags, NULL, NULL);
106
-		skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
107
-		ret = crypto_skcipher_encrypt(req);
108
-		skcipher_request_zero(req);
109
-	} else {
110
-		blkcipher_walk_init(&walk, dst, src, nbytes);
111
-		ret = blkcipher_walk_virt(desc, &walk);
112
-		while ((nbytes = walk.nbytes)) {
113
-			preempt_disable();
114
-			pagefault_disable();
115
-			enable_kernel_vsx();
116
-			aes_p8_cbc_encrypt(walk.src.virt.addr,
117
-					   walk.dst.virt.addr,
118
-					   nbytes & AES_BLOCK_MASK,
119
-					   &ctx->enc_key, walk.iv, 1);
120
-			disable_kernel_vsx();
121
-			pagefault_enable();
122
-			preempt_enable();
79
+	if (!crypto_simd_usable()) {
80
+		struct skcipher_request *subreq = skcipher_request_ctx(req);
12381 
124
-			nbytes &= AES_BLOCK_SIZE - 1;
125
-			ret = blkcipher_walk_done(desc, &walk, nbytes);
126
-		}
82
+		*subreq = *req;
83
+		skcipher_request_set_tfm(subreq, ctx->fallback);
84
+		return enc ? crypto_skcipher_encrypt(subreq) :
85
+			     crypto_skcipher_decrypt(subreq);
12786 	}
12887 
129
-	return ret;
130
-}
88
+	ret = skcipher_walk_virt(&walk, req, false);
89
+	while ((nbytes = walk.nbytes) != 0) {
90
+		preempt_disable();
91
+		pagefault_disable();
92
+		enable_kernel_vsx();
93
+		aes_p8_cbc_encrypt(walk.src.virt.addr,
94
+				   walk.dst.virt.addr,
95
+				   round_down(nbytes, AES_BLOCK_SIZE),
96
+				   enc ? &ctx->enc_key : &ctx->dec_key,
97
+				   walk.iv, enc);
98
+		disable_kernel_vsx();
99
+		pagefault_enable();
100
+		preempt_enable();
131101 
132
-static int p8_aes_cbc_decrypt(struct blkcipher_desc *desc,
133
-			      struct scatterlist *dst,
134
-			      struct scatterlist *src, unsigned int nbytes)
135
-{
136
-	int ret;
137
-	struct blkcipher_walk walk;
138
-	struct p8_aes_cbc_ctx *ctx =
139
-		crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
140
-
141
-	if (in_interrupt()) {
142
-		SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
143
-		skcipher_request_set_tfm(req, ctx->fallback);
144
-		skcipher_request_set_callback(req, desc->flags, NULL, NULL);
145
-		skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
146
-		ret = crypto_skcipher_decrypt(req);
147
-		skcipher_request_zero(req);
148
-	} else {
149
-		blkcipher_walk_init(&walk, dst, src, nbytes);
150
-		ret = blkcipher_walk_virt(desc, &walk);
151
-		while ((nbytes = walk.nbytes)) {
152
-			preempt_disable();
153
-			pagefault_disable();
154
-			enable_kernel_vsx();
155
-			aes_p8_cbc_encrypt(walk.src.virt.addr,
156
-					   walk.dst.virt.addr,
157
-					   nbytes & AES_BLOCK_MASK,
158
-					   &ctx->dec_key, walk.iv, 0);
159
-			disable_kernel_vsx();
160
-			pagefault_enable();
161
-			preempt_enable();
162
-
163
-			nbytes &= AES_BLOCK_SIZE - 1;
164
-			ret = blkcipher_walk_done(desc, &walk, nbytes);
165
-		}
102
+		ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
166103 	}
167
-
168104 	return ret;
169105 }
170106 
107
+static int p8_aes_cbc_encrypt(struct skcipher_request *req)
108
+{
109
+	return p8_aes_cbc_crypt(req, 1);
110
+}
171111 
172
-struct crypto_alg p8_aes_cbc_alg = {
173
-	.cra_name = "cbc(aes)",
174
-	.cra_driver_name = "p8_aes_cbc",
175
-	.cra_module = THIS_MODULE,
176
-	.cra_priority = 2000,
177
-	.cra_type = &crypto_blkcipher_type,
178
-	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
179
-	.cra_alignmask = 0,
180
-	.cra_blocksize = AES_BLOCK_SIZE,
181
-	.cra_ctxsize = sizeof(struct p8_aes_cbc_ctx),
182
-	.cra_init = p8_aes_cbc_init,
183
-	.cra_exit = p8_aes_cbc_exit,
184
-	.cra_blkcipher = {
185
-			  .ivsize = AES_BLOCK_SIZE,
186
-			  .min_keysize = AES_MIN_KEY_SIZE,
187
-			  .max_keysize = AES_MAX_KEY_SIZE,
188
-			  .setkey = p8_aes_cbc_setkey,
189
-			  .encrypt = p8_aes_cbc_encrypt,
190
-			  .decrypt = p8_aes_cbc_decrypt,
191
-	},
112
+static int p8_aes_cbc_decrypt(struct skcipher_request *req)
113
+{
114
+	return p8_aes_cbc_crypt(req, 0);
115
+}
116
+
117
+struct skcipher_alg p8_aes_cbc_alg = {
118
+	.base.cra_name = "cbc(aes)",
119
+	.base.cra_driver_name = "p8_aes_cbc",
120
+	.base.cra_module = THIS_MODULE,
121
+	.base.cra_priority = 2000,
122
+	.base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
123
+	.base.cra_blocksize = AES_BLOCK_SIZE,
124
+	.base.cra_ctxsize = sizeof(struct p8_aes_cbc_ctx),
125
+	.setkey = p8_aes_cbc_setkey,
126
+	.encrypt = p8_aes_cbc_encrypt,
127
+	.decrypt = p8_aes_cbc_decrypt,
128
+	.init = p8_aes_cbc_init,
129
+	.exit = p8_aes_cbc_exit,
130
+	.min_keysize = AES_MIN_KEY_SIZE,
131
+	.max_keysize = AES_MAX_KEY_SIZE,
132
+	.ivsize = AES_BLOCK_SIZE,
192133 };