Orange Pi5 kernel

// 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)");