Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Cryptographic API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * ARC4 Cipher Algorithm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Jon Oberheide <jon@oberheide.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <crypto/algapi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <crypto/arc4.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <crypto/internal/skcipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int crypto_arc4_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 			      unsigned int key_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	return arc4_setkey(ctx, in_key, key_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int crypto_arc4_crypt(struct skcipher_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	struct skcipher_walk walk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	err = skcipher_walk_virt(&walk, req, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	while (walk.nbytes > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		arc4_crypt(ctx, walk.dst.virt.addr, walk.src.virt.addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			   walk.nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		err = skcipher_walk_done(&walk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static int crypto_arc4_init(struct crypto_skcipher *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			    current->comm, (unsigned long)current->pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static struct skcipher_alg arc4_alg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	 * For legacy reasons, this is named "ecb(arc4)", not "arc4".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	 * Nevertheless it's actually a stream cipher, not a block cipher.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	.base.cra_name		=	"ecb(arc4)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	.base.cra_driver_name	=	"ecb(arc4)-generic",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	.base.cra_priority	=	100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	.base.cra_blocksize	=	ARC4_BLOCK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	.base.cra_ctxsize	=	sizeof(struct arc4_ctx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	.base.cra_module	=	THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.min_keysize		=	ARC4_MIN_KEY_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	.max_keysize		=	ARC4_MAX_KEY_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.setkey			=	crypto_arc4_setkey,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	.encrypt		=	crypto_arc4_crypt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	.decrypt		=	crypto_arc4_crypt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	.init			=	crypto_arc4_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int __init arc4_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	return crypto_register_skcipher(&arc4_alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static void __exit arc4_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	crypto_unregister_skcipher(&arc4_alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) subsys_initcall(arc4_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) module_exit(arc4_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) MODULE_ALIAS_CRYPTO("ecb(arc4)");