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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Cryptographic API4 *5 * ARC4 Cipher Algorithm6 *7 * Jon Oberheide <jon@oberheide.org>8 */9 10#include <crypto/arc4.h>11#include <crypto/internal/skcipher.h>12#include <linux/init.h>13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/sched.h>16 17#define ARC4_ALIGN __alignof__(struct arc4_ctx)18 19static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,20 unsigned int key_len)21{22 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);23 24 return arc4_setkey(ctx, in_key, key_len);25}26 27static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,28 u8 *dst, unsigned nbytes, u8 *siv, u32 flags)29{30 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);31 32 if (!(flags & CRYPTO_LSKCIPHER_FLAG_CONT))33 memcpy(siv, ctx, sizeof(*ctx));34 35 ctx = (struct arc4_ctx *)siv;36 37 arc4_crypt(ctx, dst, src, nbytes);38 return 0;39}40 41static int crypto_arc4_init(struct crypto_lskcipher *tfm)42{43 pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",44 current->comm, (unsigned long)current->pid);45 46 return 0;47}48 49static struct lskcipher_alg arc4_alg = {50 .co.base.cra_name = "arc4",51 .co.base.cra_driver_name = "arc4-generic",52 .co.base.cra_priority = 100,53 .co.base.cra_blocksize = ARC4_BLOCK_SIZE,54 .co.base.cra_ctxsize = sizeof(struct arc4_ctx),55 .co.base.cra_alignmask = ARC4_ALIGN - 1,56 .co.base.cra_module = THIS_MODULE,57 .co.min_keysize = ARC4_MIN_KEY_SIZE,58 .co.max_keysize = ARC4_MAX_KEY_SIZE,59 .co.statesize = sizeof(struct arc4_ctx),60 .setkey = crypto_arc4_setkey,61 .encrypt = crypto_arc4_crypt,62 .decrypt = crypto_arc4_crypt,63 .init = crypto_arc4_init,64};65 66static int __init arc4_init(void)67{68 return crypto_register_lskcipher(&arc4_alg);69}70 71static void __exit arc4_exit(void)72{73 crypto_unregister_lskcipher(&arc4_alg);74}75 76subsys_initcall(arc4_init);77module_exit(arc4_exit);78 79MODULE_LICENSE("GPL");80MODULE_DESCRIPTION("ARC4 Cipher Algorithm");81MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");82MODULE_ALIAS_CRYPTO("ecb(arc4)");83