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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/crypto/vmx/aes_ctr.c
....@@ -1,33 +1,17 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /**
23  * AES CTR 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 
....@@ -36,44 +20,38 @@
3620 	struct aes_key enc_key;
3721 };
3822 
39
-static int p8_aes_ctr_init(struct crypto_tfm *tfm)
23
+static int p8_aes_ctr_init(struct crypto_skcipher *tfm)
4024 {
41
-	const char *alg = crypto_tfm_alg_name(tfm);
25
+	struct p8_aes_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
4226 	struct crypto_skcipher *fallback;
43
-	struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
4427 
45
-	fallback = crypto_alloc_skcipher(alg, 0,
46
-			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
28
+	fallback = crypto_alloc_skcipher("ctr(aes)", 0,
29
+					 CRYPTO_ALG_NEED_FALLBACK |
30
+					 CRYPTO_ALG_ASYNC);
4731 	if (IS_ERR(fallback)) {
48
-		printk(KERN_ERR
49
-		       "Failed to allocate transformation for '%s': %ld\n",
50
-		       alg, PTR_ERR(fallback));
32
+		pr_err("Failed to allocate ctr(aes) fallback: %ld\n",
33
+		       PTR_ERR(fallback));
5134 		return PTR_ERR(fallback);
5235 	}
5336 
54
-	crypto_skcipher_set_flags(
55
-		fallback,
56
-		crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
37
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
38
+				    crypto_skcipher_reqsize(fallback));
5739 	ctx->fallback = fallback;
58
-
5940 	return 0;
6041 }
6142 
62
-static void p8_aes_ctr_exit(struct crypto_tfm *tfm)
43
+static void p8_aes_ctr_exit(struct crypto_skcipher *tfm)
6344 {
64
-	struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
45
+	struct p8_aes_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
6546 
66
-	if (ctx->fallback) {
67
-		crypto_free_skcipher(ctx->fallback);
68
-		ctx->fallback = NULL;
69
-	}
47
+	crypto_free_skcipher(ctx->fallback);
7048 }
7149 
72
-static int p8_aes_ctr_setkey(struct crypto_tfm *tfm, const u8 *key,
50
+static int p8_aes_ctr_setkey(struct crypto_skcipher *tfm, const u8 *key,
7351 			     unsigned int keylen)
7452 {
53
+	struct p8_aes_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
7554 	int ret;
76
-	struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
7755 
7856 	preempt_disable();
7957 	pagefault_disable();
....@@ -83,12 +61,13 @@
8361 	pagefault_enable();
8462 	preempt_enable();
8563 
86
-	ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
87
-	return ret;
64
+	ret |= crypto_skcipher_setkey(ctx->fallback, key, keylen);
65
+
66
+	return ret ? -EINVAL : 0;
8867 }
8968 
90
-static void p8_aes_ctr_final(struct p8_aes_ctr_ctx *ctx,
91
-			     struct blkcipher_walk *walk)
69
+static void p8_aes_ctr_final(const struct p8_aes_ctr_ctx *ctx,
70
+			     struct skcipher_walk *walk)
9271 {
9372 	u8 *ctrblk = walk->iv;
9473 	u8 keystream[AES_BLOCK_SIZE];
....@@ -108,77 +87,63 @@
10887 	crypto_inc(ctrblk, AES_BLOCK_SIZE);
10988 }
11089 
111
-static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
112
-			    struct scatterlist *dst,
113
-			    struct scatterlist *src, unsigned int nbytes)
90
+static int p8_aes_ctr_crypt(struct skcipher_request *req)
11491 {
92
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
93
+	const struct p8_aes_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
94
+	struct skcipher_walk walk;
95
+	unsigned int nbytes;
11596 	int ret;
116
-	u64 inc;
117
-	struct blkcipher_walk walk;
118
-	struct p8_aes_ctr_ctx *ctx =
119
-		crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
12097 
121
-	if (in_interrupt()) {
122
-		SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
123
-		skcipher_request_set_tfm(req, ctx->fallback);
124
-		skcipher_request_set_callback(req, desc->flags, NULL, NULL);
125
-		skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
126
-		ret = crypto_skcipher_encrypt(req);
127
-		skcipher_request_zero(req);
128
-	} else {
129
-		blkcipher_walk_init(&walk, dst, src, nbytes);
130
-		ret = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
131
-		while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
132
-			preempt_disable();
133
-			pagefault_disable();
134
-			enable_kernel_vsx();
135
-			aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr,
136
-						    walk.dst.virt.addr,
137
-						    (nbytes &
138
-						     AES_BLOCK_MASK) /
139
-						    AES_BLOCK_SIZE,
140
-						    &ctx->enc_key,
141
-						    walk.iv);
142
-			disable_kernel_vsx();
143
-			pagefault_enable();
144
-			preempt_enable();
98
+	if (!crypto_simd_usable()) {
99
+		struct skcipher_request *subreq = skcipher_request_ctx(req);
145100 
146
-			/* We need to update IV mostly for last bytes/round */
147
-			inc = (nbytes & AES_BLOCK_MASK) / AES_BLOCK_SIZE;
148
-			if (inc > 0)
149
-				while (inc--)
150
-					crypto_inc(walk.iv, AES_BLOCK_SIZE);
151
-
152
-			nbytes &= AES_BLOCK_SIZE - 1;
153
-			ret = blkcipher_walk_done(desc, &walk, nbytes);
154
-		}
155
-		if (walk.nbytes) {
156
-			p8_aes_ctr_final(ctx, &walk);
157
-			ret = blkcipher_walk_done(desc, &walk, 0);
158
-		}
101
+		*subreq = *req;
102
+		skcipher_request_set_tfm(subreq, ctx->fallback);
103
+		return crypto_skcipher_encrypt(subreq);
159104 	}
160105 
106
+	ret = skcipher_walk_virt(&walk, req, false);
107
+	while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
108
+		preempt_disable();
109
+		pagefault_disable();
110
+		enable_kernel_vsx();
111
+		aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr,
112
+					    walk.dst.virt.addr,
113
+					    nbytes / AES_BLOCK_SIZE,
114
+					    &ctx->enc_key, walk.iv);
115
+		disable_kernel_vsx();
116
+		pagefault_enable();
117
+		preempt_enable();
118
+
119
+		do {
120
+			crypto_inc(walk.iv, AES_BLOCK_SIZE);
121
+		} while ((nbytes -= AES_BLOCK_SIZE) >= AES_BLOCK_SIZE);
122
+
123
+		ret = skcipher_walk_done(&walk, nbytes);
124
+	}
125
+	if (nbytes) {
126
+		p8_aes_ctr_final(ctx, &walk);
127
+		ret = skcipher_walk_done(&walk, 0);
128
+	}
161129 	return ret;
162130 }
163131 
164
-struct crypto_alg p8_aes_ctr_alg = {
165
-	.cra_name = "ctr(aes)",
166
-	.cra_driver_name = "p8_aes_ctr",
167
-	.cra_module = THIS_MODULE,
168
-	.cra_priority = 2000,
169
-	.cra_type = &crypto_blkcipher_type,
170
-	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
171
-	.cra_alignmask = 0,
172
-	.cra_blocksize = 1,
173
-	.cra_ctxsize = sizeof(struct p8_aes_ctr_ctx),
174
-	.cra_init = p8_aes_ctr_init,
175
-	.cra_exit = p8_aes_ctr_exit,
176
-	.cra_blkcipher = {
177
-			  .ivsize = AES_BLOCK_SIZE,
178
-			  .min_keysize = AES_MIN_KEY_SIZE,
179
-			  .max_keysize = AES_MAX_KEY_SIZE,
180
-			  .setkey = p8_aes_ctr_setkey,
181
-			  .encrypt = p8_aes_ctr_crypt,
182
-			  .decrypt = p8_aes_ctr_crypt,
183
-	},
132
+struct skcipher_alg p8_aes_ctr_alg = {
133
+	.base.cra_name = "ctr(aes)",
134
+	.base.cra_driver_name = "p8_aes_ctr",
135
+	.base.cra_module = THIS_MODULE,
136
+	.base.cra_priority = 2000,
137
+	.base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
138
+	.base.cra_blocksize = 1,
139
+	.base.cra_ctxsize = sizeof(struct p8_aes_ctr_ctx),
140
+	.setkey = p8_aes_ctr_setkey,
141
+	.encrypt = p8_aes_ctr_crypt,
142
+	.decrypt = p8_aes_ctr_crypt,
143
+	.init = p8_aes_ctr_init,
144
+	.exit = p8_aes_ctr_exit,
145
+	.min_keysize = AES_MIN_KEY_SIZE,
146
+	.max_keysize = AES_MAX_KEY_SIZE,
147
+	.ivsize = AES_BLOCK_SIZE,
148
+	.chunksize = AES_BLOCK_SIZE,
184149 };