| // 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/module.h> |
| |
| static int arc4_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
| unsigned int key_len) |
| { |
| struct arc4_ctx *ctx = crypto_tfm_ctx(tfm); |
| |
| return arc4_setkey(ctx, in_key, key_len); |
| } |
| |
| static int arc4_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *in_key, |
| unsigned int key_len) |
| { |
| return arc4_set_key(&tfm->base, in_key, key_len); |
| } |
| |
| static void arc4_crypt_one(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
| { |
| arc4_crypt(crypto_tfm_ctx(tfm), out, in, 1); |
| } |
| |
| static int ecb_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 struct crypto_alg arc4_cipher = { |
| .cra_name = "arc4", |
| .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| .cra_blocksize = ARC4_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct arc4_ctx), |
| .cra_module = THIS_MODULE, |
| .cra_u = { |
| .cipher = { |
| .cia_min_keysize = ARC4_MIN_KEY_SIZE, |
| .cia_max_keysize = ARC4_MAX_KEY_SIZE, |
| .cia_setkey = arc4_set_key, |
| .cia_encrypt = arc4_crypt_one, |
| .cia_decrypt = arc4_crypt_one, |
| }, |
| }, |
| }; |
| |
| static struct skcipher_alg arc4_skcipher = { |
| .base.cra_name = "ecb(arc4)", |
| .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 = arc4_set_key_skcipher, |
| .encrypt = ecb_arc4_crypt, |
| .decrypt = ecb_arc4_crypt, |
| }; |
| |
| static int __init arc4_init(void) |
| { |
| int err; |
| |
| err = crypto_register_alg(&arc4_cipher); |
| if (err) |
| return err; |
| |
| err = crypto_register_skcipher(&arc4_skcipher); |
| if (err) |
| crypto_unregister_alg(&arc4_cipher); |
| return err; |
| } |
| |
| static void __exit arc4_exit(void) |
| { |
| crypto_unregister_alg(&arc4_cipher); |
| crypto_unregister_skcipher(&arc4_skcipher); |
| } |
| |
| 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("arc4"); |