write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/crypto/vmx/aes_xts.c
..
..
@@ -1,34 +1,18 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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2
 /**
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  * AES XTS routines supporting VMX In-core instructions on Power 8
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  *
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  * Copyright (C) 2015 International Business Machines Inc.
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  *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundations; version 2 only.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY of FITNESS FOR A PARTICUPAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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- *
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  * Author: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
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  */
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9
 
22
-#include <linux/types.h>
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-#include <linux/err.h>
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-#include <linux/crypto.h>
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-#include <linux/delay.h>
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-#include <linux/hardirq.h>
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+#include <asm/simd.h>
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11
 #include <asm/switch_to.h>
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 #include <crypto/aes.h>
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-#include <crypto/scatterwalk.h>
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+#include <crypto/internal/simd.h>
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+#include <crypto/internal/skcipher.h>
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15
 #include <crypto/xts.h>
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-#include <crypto/skcipher.h>
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16
 
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 #include "aesp8-ppc.h"
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18
 
..
..
@@ -39,46 +23,40 @@
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23
 	struct aes_key tweak_key;
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24
 };
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25
 
42
-static int p8_aes_xts_init(struct crypto_tfm *tfm)
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+static int p8_aes_xts_init(struct crypto_skcipher *tfm)
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27
 {
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-	const char *alg = crypto_tfm_alg_name(tfm);
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+	struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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29
 	struct crypto_skcipher *fallback;
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-	struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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30
 
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-	fallback = crypto_alloc_skcipher(alg, 0,
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-			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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+	fallback = crypto_alloc_skcipher("xts(aes)", 0,
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+					 CRYPTO_ALG_NEED_FALLBACK |
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+					 CRYPTO_ALG_ASYNC);
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34
 	if (IS_ERR(fallback)) {
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-		printk(KERN_ERR
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-			"Failed to allocate transformation for '%s': %ld\n",
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-			alg, PTR_ERR(fallback));
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+		pr_err("Failed to allocate xts(aes) fallback: %ld\n",
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+		       PTR_ERR(fallback));
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37
 		return PTR_ERR(fallback);
55
38
 	}
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39
 
57
-	crypto_skcipher_set_flags(
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-		fallback,
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-		crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
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+	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
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+				    crypto_skcipher_reqsize(fallback));
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42
 	ctx->fallback = fallback;
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-
62
43
 	return 0;
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44
 }
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45
 
65
-static void p8_aes_xts_exit(struct crypto_tfm *tfm)
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+static void p8_aes_xts_exit(struct crypto_skcipher *tfm)
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47
 {
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-	struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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+	struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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49
 
69
-	if (ctx->fallback) {
70
-		crypto_free_skcipher(ctx->fallback);
71
-		ctx->fallback = NULL;
72
-	}
50
+	crypto_free_skcipher(ctx->fallback);
73
51
 }
74
52
 
75
-static int p8_aes_xts_setkey(struct crypto_tfm *tfm, const u8 *key,
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+static int p8_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key,
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54
 			     unsigned int keylen)
77
55
 {
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+	struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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57
 	int ret;
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-	struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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58
 
81
-	ret = xts_check_key(tfm, key, keylen);
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+	ret = xts_verify_key(tfm, key, keylen);
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60
 	if (ret)
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 		return ret;
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62
 
..
..
@@ -86,105 +64,99 @@
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64
 	pagefault_disable();
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65
 	enable_kernel_vsx();
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66
 	ret = aes_p8_set_encrypt_key(key + keylen/2, (keylen/2) * 8, &ctx->tweak_key);
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-	ret += aes_p8_set_encrypt_key(key, (keylen/2) * 8, &ctx->enc_key);
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-	ret += aes_p8_set_decrypt_key(key, (keylen/2) * 8, &ctx->dec_key);
67
+	ret |= aes_p8_set_encrypt_key(key, (keylen/2) * 8, &ctx->enc_key);
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+	ret |= aes_p8_set_decrypt_key(key, (keylen/2) * 8, &ctx->dec_key);
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69
 	disable_kernel_vsx();
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 	pagefault_enable();
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 	preempt_enable();
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-	ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
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-	return ret;
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+	ret |= crypto_skcipher_setkey(ctx->fallback, key, keylen);
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+
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+	return ret ? -EINVAL : 0;
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 }
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77
 
99
-static int p8_aes_xts_crypt(struct blkcipher_desc *desc,
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-			    struct scatterlist *dst,
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-			    struct scatterlist *src,
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-			    unsigned int nbytes, int enc)
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+static int p8_aes_xts_crypt(struct skcipher_request *req, int enc)
103
79
 {
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-	int ret;
80
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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+	const struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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+	struct skcipher_walk walk;
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+	unsigned int nbytes;
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84
 	u8 tweak[AES_BLOCK_SIZE];
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-	u8 *iv;
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-	struct blkcipher_walk walk;
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-	struct p8_aes_xts_ctx *ctx =
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-		crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
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+	int ret;
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86
 
111
-	if (in_interrupt()) {
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-		SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
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-		skcipher_request_set_tfm(req, ctx->fallback);
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-		skcipher_request_set_callback(req, desc->flags, NULL, NULL);
115
-		skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
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-		ret = enc? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req);
117
-		skcipher_request_zero(req);
118
-	} else {
119
-		blkcipher_walk_init(&walk, dst, src, nbytes);
87
+	if (req->cryptlen < AES_BLOCK_SIZE)
88
+		return -EINVAL;
120
89
 
121
-		ret = blkcipher_walk_virt(desc, &walk);
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+	if (!crypto_simd_usable() || (req->cryptlen % XTS_BLOCK_SIZE) != 0) {
91
+		struct skcipher_request *subreq = skcipher_request_ctx(req);
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92
 
93
+		*subreq = *req;
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+		skcipher_request_set_tfm(subreq, ctx->fallback);
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+		return enc ? crypto_skcipher_encrypt(subreq) :
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+			     crypto_skcipher_decrypt(subreq);
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+	}
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+
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+	ret = skcipher_walk_virt(&walk, req, false);
100
+	if (ret)
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+		return ret;
102
+
103
+	preempt_disable();
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+	pagefault_disable();
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+	enable_kernel_vsx();
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+
107
+	aes_p8_encrypt(walk.iv, tweak, &ctx->tweak_key);
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+
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+	disable_kernel_vsx();
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+	pagefault_enable();
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+	preempt_enable();
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+
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+	while ((nbytes = walk.nbytes) != 0) {
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114
 		preempt_disable();
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 		pagefault_disable();
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116
 		enable_kernel_vsx();
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-
127
-		iv = walk.iv;
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-		memset(tweak, 0, AES_BLOCK_SIZE);
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-		aes_p8_encrypt(iv, tweak, &ctx->tweak_key);
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-
117
+		if (enc)
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+			aes_p8_xts_encrypt(walk.src.virt.addr,
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+					   walk.dst.virt.addr,
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+					   round_down(nbytes, AES_BLOCK_SIZE),
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+					   &ctx->enc_key, NULL, tweak);
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+		else
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+			aes_p8_xts_decrypt(walk.src.virt.addr,
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+					   walk.dst.virt.addr,
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+					   round_down(nbytes, AES_BLOCK_SIZE),
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+					   &ctx->dec_key, NULL, tweak);
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127
 		disable_kernel_vsx();
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128
 		pagefault_enable();
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129
 		preempt_enable();
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130
 
135
-		while ((nbytes = walk.nbytes)) {
136
-			preempt_disable();
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-			pagefault_disable();
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-			enable_kernel_vsx();
139
-			if (enc)
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-				aes_p8_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
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-						nbytes & AES_BLOCK_MASK, &ctx->enc_key, NULL, tweak);
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-			else
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-				aes_p8_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
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-						nbytes & AES_BLOCK_MASK, &ctx->dec_key, NULL, tweak);
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-			disable_kernel_vsx();
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-			pagefault_enable();
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-			preempt_enable();
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-
149
-			nbytes &= AES_BLOCK_SIZE - 1;
150
-			ret = blkcipher_walk_done(desc, &walk, nbytes);
151
-		}
131
+		ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
152
132
 	}
153
133
 	return ret;
154
134
 }
155
135
 
156
-static int p8_aes_xts_encrypt(struct blkcipher_desc *desc,
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-			      struct scatterlist *dst,
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-			      struct scatterlist *src, unsigned int nbytes)
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+static int p8_aes_xts_encrypt(struct skcipher_request *req)
159
137
 {
160
-	return p8_aes_xts_crypt(desc, dst, src, nbytes, 1);
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+	return p8_aes_xts_crypt(req, 1);
161
139
 }
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140
 
163
-static int p8_aes_xts_decrypt(struct blkcipher_desc *desc,
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-			      struct scatterlist *dst,
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-			      struct scatterlist *src, unsigned int nbytes)
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+static int p8_aes_xts_decrypt(struct skcipher_request *req)
166
142
 {
167
-	return p8_aes_xts_crypt(desc, dst, src, nbytes, 0);
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+	return p8_aes_xts_crypt(req, 0);
168
144
 }
169
145
 
170
-struct crypto_alg p8_aes_xts_alg = {
171
-	.cra_name = "xts(aes)",
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-	.cra_driver_name = "p8_aes_xts",
173
-	.cra_module = THIS_MODULE,
174
-	.cra_priority = 2000,
175
-	.cra_type = &crypto_blkcipher_type,
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-	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
177
-	.cra_alignmask = 0,
178
-	.cra_blocksize = AES_BLOCK_SIZE,
179
-	.cra_ctxsize = sizeof(struct p8_aes_xts_ctx),
180
-	.cra_init = p8_aes_xts_init,
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-	.cra_exit = p8_aes_xts_exit,
182
-	.cra_blkcipher = {
183
-			.ivsize = AES_BLOCK_SIZE,
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-			.min_keysize = 2 * AES_MIN_KEY_SIZE,
185
-			.max_keysize = 2 * AES_MAX_KEY_SIZE,
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-			.setkey	 = p8_aes_xts_setkey,
187
-			.encrypt = p8_aes_xts_encrypt,
188
-			.decrypt = p8_aes_xts_decrypt,
189
-	}
146
+struct skcipher_alg p8_aes_xts_alg = {
147
+	.base.cra_name = "xts(aes)",
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+	.base.cra_driver_name = "p8_aes_xts",
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+	.base.cra_module = THIS_MODULE,
150
+	.base.cra_priority = 2000,
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+	.base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
152
+	.base.cra_blocksize = AES_BLOCK_SIZE,
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+	.base.cra_ctxsize = sizeof(struct p8_aes_xts_ctx),
154
+	.setkey = p8_aes_xts_setkey,
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+	.encrypt = p8_aes_xts_encrypt,
156
+	.decrypt = p8_aes_xts_decrypt,
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+	.init = p8_aes_xts_init,
158
+	.exit = p8_aes_xts_exit,
159
+	.min_keysize = 2 * AES_MIN_KEY_SIZE,
160
+	.max_keysize = 2 * AES_MAX_KEY_SIZE,
161
+	.ivsize = AES_BLOCK_SIZE,
190
162
 };