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2023-12-14 982b8cc116118b3463d3f332581945625722acd8 
 kernel/crypto/arc4.c
....@@ -1,169 +1,87 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Cryptographic API
34  *
45  * ARC4 Cipher Algorithm
56  *
67  * Jon Oberheide <jon@oberheide.org>
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
12
- *
138  */
149 
15
-#include <linux/module.h>
16
-#include <linux/init.h>
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-#include <linux/crypto.h>
1810 #include <crypto/algapi.h>
11
+#include <crypto/arc4.h>
12
+#include <crypto/internal/skcipher.h>
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+#include <linux/init.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/sched.h>
1917 
20
-#define ARC4_MIN_KEY_SIZE	1
21
-#define ARC4_MAX_KEY_SIZE	256
22
-#define ARC4_BLOCK_SIZE		1
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-
24
-struct arc4_ctx {
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-	u32 S[256];
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-	u32 x, y;
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-};
28
-
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-static int arc4_set_key(struct crypto_tfm *tfm, const u8 *in_key,
30
-			unsigned int key_len)
18
+static int crypto_arc4_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
19
+			      unsigned int key_len)
3120 {
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-	struct arc4_ctx *ctx = crypto_tfm_ctx(tfm);
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-	int i, j = 0, k = 0;
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+	struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
3422 
35
-	ctx->x = 1;
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-	ctx->y = 0;
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-
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-	for (i = 0; i < 256; i++)
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-		ctx->S[i] = i;
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-
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-	for (i = 0; i < 256; i++) {
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-		u32 a = ctx->S[i];
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-		j = (j + in_key[k] + a) & 0xff;
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-		ctx->S[i] = ctx->S[j];
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-		ctx->S[j] = a;
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-		if (++k >= key_len)
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-			k = 0;
48
-	}
49
-
50
-	return 0;
23
+	return arc4_setkey(ctx, in_key, key_len);
5124 }
5225 
53
-static void arc4_crypt(struct arc4_ctx *ctx, u8 *out, const u8 *in,
54
-		       unsigned int len)
26
+static int crypto_arc4_crypt(struct skcipher_request *req)
5527 {
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-	u32 *const S = ctx->S;
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-	u32 x, y, a, b;
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-	u32 ty, ta, tb;
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-
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-	if (len == 0)
61
-		return;
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-
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-	x = ctx->x;
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-	y = ctx->y;
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-
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-	a = S[x];
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-	y = (y + a) & 0xff;
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-	b = S[y];
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-
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-	do {
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-		S[y] = a;
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-		a = (a + b) & 0xff;
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-		S[x] = b;
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-		x = (x + 1) & 0xff;
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-		ta = S[x];
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-		ty = (y + ta) & 0xff;
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-		tb = S[ty];
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-		*out++ = *in++ ^ S[a];
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-		if (--len == 0)
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-			break;
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-		y = ty;
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-		a = ta;
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-		b = tb;
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-	} while (true);
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-
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-	ctx->x = x;
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-	ctx->y = y;
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-}
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-
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-static void arc4_crypt_one(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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-{
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-	arc4_crypt(crypto_tfm_ctx(tfm), out, in, 1);
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-}
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-
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-static int ecb_arc4_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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-			  struct scatterlist *src, unsigned int nbytes)
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-{
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-	struct arc4_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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-	struct blkcipher_walk walk;
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+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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+	struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
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+	struct skcipher_walk walk;
10031 	int err;
10132 
102
-	blkcipher_walk_init(&walk, dst, src, nbytes);
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-
104
-	err = blkcipher_walk_virt(desc, &walk);
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+	err = skcipher_walk_virt(&walk, req, false);
10534 
10635 	while (walk.nbytes > 0) {
107
-		u8 *wsrc = walk.src.virt.addr;
108
-		u8 *wdst = walk.dst.virt.addr;
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-
110
-		arc4_crypt(ctx, wdst, wsrc, walk.nbytes);
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-
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-		err = blkcipher_walk_done(desc, &walk, 0);
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+		arc4_crypt(ctx, walk.dst.virt.addr, walk.src.virt.addr,
37
+			   walk.nbytes);
38
+		err = skcipher_walk_done(&walk, 0);
11339 	}
11440 
11541 	return err;
11642 }
11743 
118
-static struct crypto_alg arc4_algs[2] = { {
119
-	.cra_name		=	"arc4",
120
-	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
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-	.cra_blocksize		=	ARC4_BLOCK_SIZE,
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-	.cra_ctxsize		=	sizeof(struct arc4_ctx),
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-	.cra_module		=	THIS_MODULE,
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-	.cra_u			=	{
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-		.cipher = {
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-			.cia_min_keysize	=	ARC4_MIN_KEY_SIZE,
127
-			.cia_max_keysize	=	ARC4_MAX_KEY_SIZE,
128
-			.cia_setkey		=	arc4_set_key,
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-			.cia_encrypt		=	arc4_crypt_one,
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-			.cia_decrypt		=	arc4_crypt_one,
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-		},
132
-	},
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-}, {
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-	.cra_name		=	"ecb(arc4)",
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-	.cra_priority		=	100,
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-	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
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-	.cra_blocksize		=	ARC4_BLOCK_SIZE,
138
-	.cra_ctxsize		=	sizeof(struct arc4_ctx),
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-	.cra_alignmask		=	0,
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-	.cra_type		=	&crypto_blkcipher_type,
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-	.cra_module		=	THIS_MODULE,
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-	.cra_u			=	{
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-		.blkcipher = {
144
-			.min_keysize	=	ARC4_MIN_KEY_SIZE,
145
-			.max_keysize	=	ARC4_MAX_KEY_SIZE,
146
-			.setkey		=	arc4_set_key,
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-			.encrypt	=	ecb_arc4_crypt,
148
-			.decrypt	=	ecb_arc4_crypt,
149
-		},
150
-	},
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-} };
44
+static int crypto_arc4_init(struct crypto_skcipher *tfm)
45
+{
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+	pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
47
+			    current->comm, (unsigned long)current->pid);
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+
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+	return 0;
50
+}
51
+
52
+static struct skcipher_alg arc4_alg = {
53
+	/*
54
+	 * For legacy reasons, this is named "ecb(arc4)", not "arc4".
55
+	 * Nevertheless it's actually a stream cipher, not a block cipher.
56
+	 */
57
+	.base.cra_name		=	"ecb(arc4)",
58
+	.base.cra_driver_name	=	"ecb(arc4)-generic",
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+	.base.cra_priority	=	100,
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+	.base.cra_blocksize	=	ARC4_BLOCK_SIZE,
61
+	.base.cra_ctxsize	=	sizeof(struct arc4_ctx),
62
+	.base.cra_module	=	THIS_MODULE,
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+	.min_keysize		=	ARC4_MIN_KEY_SIZE,
64
+	.max_keysize		=	ARC4_MAX_KEY_SIZE,
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+	.setkey			=	crypto_arc4_setkey,
66
+	.encrypt		=	crypto_arc4_crypt,
67
+	.decrypt		=	crypto_arc4_crypt,
68
+	.init			=	crypto_arc4_init,
69
+};
15270 
15371 static int __init arc4_init(void)
15472 {
155
-	return crypto_register_algs(arc4_algs, ARRAY_SIZE(arc4_algs));
73
+	return crypto_register_skcipher(&arc4_alg);
15674 }
15775 
15876 static void __exit arc4_exit(void)
15977 {
160
-	crypto_unregister_algs(arc4_algs, ARRAY_SIZE(arc4_algs));
78
+	crypto_unregister_skcipher(&arc4_alg);
16179 }
16280 
163
-module_init(arc4_init);
81
+subsys_initcall(arc4_init);
16482 module_exit(arc4_exit);
16583 
16684 MODULE_LICENSE("GPL");
16785 MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
16886 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
169
-MODULE_ALIAS_CRYPTO("arc4");
87
+MODULE_ALIAS_CRYPTO("ecb(arc4)");