// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API
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*
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* ARC4 Cipher Algorithm
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*
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* Jon Oberheide <jon@oberheide.org>
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*/
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#include <crypto/algapi.h>
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#include <crypto/arc4.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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static int crypto_arc4_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
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return arc4_setkey(ctx, in_key, key_len);
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}
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static int crypto_arc4_crypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes > 0) {
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arc4_crypt(ctx, walk.dst.virt.addr, walk.src.virt.addr,
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walk.nbytes);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static int crypto_arc4_init(struct crypto_skcipher *tfm)
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{
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pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
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current->comm, (unsigned long)current->pid);
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return 0;
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}
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static struct skcipher_alg arc4_alg = {
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/*
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* For legacy reasons, this is named "ecb(arc4)", not "arc4".
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* Nevertheless it's actually a stream cipher, not a block cipher.
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*/
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.base.cra_name = "ecb(arc4)",
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.base.cra_driver_name = "ecb(arc4)-generic",
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.base.cra_priority = 100,
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.base.cra_blocksize = ARC4_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct arc4_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = ARC4_MIN_KEY_SIZE,
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.max_keysize = ARC4_MAX_KEY_SIZE,
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.setkey = crypto_arc4_setkey,
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.encrypt = crypto_arc4_crypt,
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.decrypt = crypto_arc4_crypt,
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.init = crypto_arc4_init,
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};
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static int __init arc4_init(void)
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{
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return crypto_register_skcipher(&arc4_alg);
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}
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static void __exit arc4_exit(void)
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{
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crypto_unregister_skcipher(&arc4_alg);
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}
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subsys_initcall(arc4_init);
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module_exit(arc4_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
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MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
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MODULE_ALIAS_CRYPTO("ecb(arc4)");
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