// SPDX-License-Identifier: GPL-2.0-or-later/* * CBC: Cipher Block Chaining mode * * Copyright (c) 2006-2016 Herbert Xu <herbert@gondor.apana.org.au> */ #include <crypto/algapi.h>#include <crypto/cbc.h>#include <crypto/internal/skcipher.h>#include <linux/err.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/log2.h>#include <linux/module.h> static inline void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm,					  const u8 *src, u8 *dst){	crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src);} static int crypto_cbc_encrypt(struct skcipher_request *req){	return crypto_cbc_encrypt_walk(req, crypto_cbc_encrypt_one);} static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm,					  const u8 *src, u8 *dst){	crypto_cipher_decrypt_one(skcipher_cipher_simple(tfm), dst, src);} static int crypto_cbc_decrypt(struct skcipher_request *req){	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);	struct skcipher_walk walk;	int err; 	err = skcipher_walk_virt(&walk, req, false); 	while (walk.nbytes) {		err = crypto_cbc_decrypt_blocks(&walk, tfm,						crypto_cbc_decrypt_one);		err = skcipher_walk_done(&walk, err);	} 	return err;} static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb){	struct skcipher_instance *inst;	struct crypto_alg *alg;	int err; 	inst = skcipher_alloc_instance_simple(tmpl, tb);	if (IS_ERR(inst))		return PTR_ERR(inst); 	alg = skcipher_ialg_simple(inst); 	err = -EINVAL;	if (!is_power_of_2(alg->cra_blocksize))		goto out_free_inst; 	inst->alg.encrypt = crypto_cbc_encrypt;	inst->alg.decrypt = crypto_cbc_decrypt; 	err = skcipher_register_instance(tmpl, inst);	if (err) {out_free_inst:		inst->free(inst);	} 	return err;} static struct crypto_template crypto_cbc_tmpl = {	.name = "cbc",	.create = crypto_cbc_create,	.module = THIS_MODULE,}; static int __init crypto_cbc_module_init(void){	return crypto_register_template(&crypto_cbc_tmpl);} static void __exit crypto_cbc_module_exit(void){	crypto_unregister_template(&crypto_cbc_tmpl);} subsys_initcall(crypto_cbc_module_init);module_exit(crypto_cbc_module_exit); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("CBC block cipher mode of operation");MODULE_ALIAS_CRYPTO("cbc");