// SPDX-License-Identifier: GPL-2.0-or-later/* * Cryptographic API * * ARC4 Cipher Algorithm * * Jon Oberheide <jon@oberheide.org> */ #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> #define ARC4_ALIGN __alignof__(struct arc4_ctx) static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,			      unsigned int key_len){	struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); 	return arc4_setkey(ctx, in_key, key_len);} static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,			     u8 *dst, unsigned nbytes, u8 *siv, u32 flags){	struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); 	if (!(flags & CRYPTO_LSKCIPHER_FLAG_CONT))		memcpy(siv, ctx, sizeof(*ctx)); 	ctx = (struct arc4_ctx *)siv; 	arc4_crypt(ctx, dst, src, nbytes);	return 0;} static int crypto_arc4_init(struct crypto_lskcipher *tfm){	pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",			    current->comm, (unsigned long)current->pid); 	return 0;} static struct lskcipher_alg arc4_alg = {	.co.base.cra_name		=	"arc4",	.co.base.cra_driver_name	=	"arc4-generic",	.co.base.cra_priority		=	100,	.co.base.cra_blocksize		=	ARC4_BLOCK_SIZE,	.co.base.cra_ctxsize		=	sizeof(struct arc4_ctx),	.co.base.cra_alignmask		=	ARC4_ALIGN - 1,	.co.base.cra_module		=	THIS_MODULE,	.co.min_keysize			=	ARC4_MIN_KEY_SIZE,	.co.max_keysize			=	ARC4_MAX_KEY_SIZE,	.co.statesize			=	sizeof(struct arc4_ctx),	.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_lskcipher(&arc4_alg);} static void __exit arc4_exit(void){	crypto_unregister_lskcipher(&arc4_alg);} module_init(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)");