// 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/module.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 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,}; 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)");