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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /crypto/arc4.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'crypto/arc4.c')
-rw-r--r--crypto/arc4.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/crypto/arc4.c b/crypto/arc4.c
new file mode 100644
index 000000000..3254dcc34
--- /dev/null
+++ b/crypto/arc4.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API
+ *
+ * ARC4 Cipher Algorithm
+ *
+ * Jon Oberheide <jon@oberheide.org>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/arc4.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+
+static int crypto_arc4_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ return arc4_setkey(ctx, in_key, key_len);
+}
+
+static int crypto_arc4_crypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while (walk.nbytes > 0) {
+ arc4_crypt(ctx, walk.dst.virt.addr, walk.src.virt.addr,
+ walk.nbytes);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ return err;
+}
+
+static int crypto_arc4_init(struct crypto_skcipher *tfm)
+{
+ pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
+ current->comm, (unsigned long)current->pid);
+
+ return 0;
+}
+
+static struct skcipher_alg arc4_alg = {
+ /*
+ * For legacy reasons, this is named "ecb(arc4)", not "arc4".
+ * Nevertheless it's actually a stream cipher, not a block cipher.
+ */
+ .base.cra_name = "ecb(arc4)",
+ .base.cra_driver_name = "ecb(arc4)-generic",
+ .base.cra_priority = 100,
+ .base.cra_blocksize = ARC4_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct arc4_ctx),
+ .base.cra_module = THIS_MODULE,
+ .min_keysize = ARC4_MIN_KEY_SIZE,
+ .max_keysize = ARC4_MAX_KEY_SIZE,
+ .setkey = crypto_arc4_setkey,
+ .encrypt = crypto_arc4_crypt,
+ .decrypt = crypto_arc4_crypt,
+ .init = crypto_arc4_init,
+};
+
+static int __init arc4_init(void)
+{
+ return crypto_register_skcipher(&arc4_alg);
+}
+
+static void __exit arc4_exit(void)
+{
+ crypto_unregister_skcipher(&arc4_alg);
+}
+
+subsys_initcall(arc4_init);
+module_exit(arc4_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
+MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
+MODULE_ALIAS_CRYPTO("ecb(arc4)");