// 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); } 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)");