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- // 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, &alg);
- if (IS_ERR(inst))
- return PTR_ERR(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)
- goto out_free_inst;
- goto out_put_alg;
- out_free_inst:
- inst->free(inst);
- out_put_alg:
- crypto_mod_put(alg);
- 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");
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