1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Cryptographic API 4 * 5 * ARC4 Cipher Algorithm 6 * 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 static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key, 18 unsigned int key_len) 19 { 20 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); 21 22 return arc4_setkey(ctx, in_key, key_len); 23 } 24 25 static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src, 26 u8 *dst, unsigned nbytes, u8 *iv, bool final) 27 { 28 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); 29 30 arc4_crypt(ctx, dst, src, nbytes); 31 return 0; 32 } 33 34 static int crypto_arc4_init(struct crypto_lskcipher *tfm) 35 { 36 pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n", 37 current->comm, (unsigned long)current->pid); 38 39 return 0; 40 } 41 42 static struct lskcipher_alg arc4_alg = { 43 .co.base.cra_name = "arc4", 44 .co.base.cra_driver_name = "arc4-generic", 45 .co.base.cra_priority = 100, 46 .co.base.cra_blocksize = ARC4_BLOCK_SIZE, 47 .co.base.cra_ctxsize = sizeof(struct arc4_ctx), 48 .co.base.cra_module = THIS_MODULE, 49 .co.min_keysize = ARC4_MIN_KEY_SIZE, 50 .co.max_keysize = ARC4_MAX_KEY_SIZE, 51 .setkey = crypto_arc4_setkey, 52 .encrypt = crypto_arc4_crypt, 53 .decrypt = crypto_arc4_crypt, 54 .init = crypto_arc4_init, 55 }; 56 57 static int __init arc4_init(void) 58 { 59 return crypto_register_lskcipher(&arc4_alg); 60 } 61 62 static void __exit arc4_exit(void) 63 { 64 crypto_unregister_lskcipher(&arc4_alg); 65 } 66 67 subsys_initcall(arc4_init); 68 module_exit(arc4_exit); 69 70 MODULE_LICENSE("GPL"); 71 MODULE_DESCRIPTION("ARC4 Cipher Algorithm"); 72 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>"); 73 MODULE_ALIAS_CRYPTO("ecb(arc4)"); 74