// 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)");