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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CBC: Cipher Block Chaining mode
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*
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* Copyright (c) 2006-2016 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/algapi.h>
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#include <crypto/cbc.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/module.h>
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static inline void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm,
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const u8 *src, u8 *dst)
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{
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crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src);
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}
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static int crypto_cbc_encrypt(struct skcipher_request *req)
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{
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return crypto_cbc_encrypt_walk(req, crypto_cbc_encrypt_one);
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}
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static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm,
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const u8 *src, u8 *dst)
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{
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crypto_cipher_decrypt_one(skcipher_cipher_simple(tfm), dst, src);
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}
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static int crypto_cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes) {
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err = crypto_cbc_decrypt_blocks(&walk, tfm,
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crypto_cbc_decrypt_one);
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err = skcipher_walk_done(&walk, err);
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}
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return err;
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}
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static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct skcipher_instance *inst;
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struct crypto_alg *alg;
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int err;
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inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
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if (IS_ERR(inst))
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return PTR_ERR(inst);
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err = -EINVAL;
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if (!is_power_of_2(alg->cra_blocksize))
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goto out_free_inst;
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inst->alg.encrypt = crypto_cbc_encrypt;
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inst->alg.decrypt = crypto_cbc_decrypt;
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err = skcipher_register_instance(tmpl, inst);
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if (err)
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goto out_free_inst;
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goto out_put_alg;
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out_free_inst:
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inst->free(inst);
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out_put_alg:
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_template crypto_cbc_tmpl = {
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.name = "cbc",
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.create = crypto_cbc_create,
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.module = THIS_MODULE,
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};
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static int __init crypto_cbc_module_init(void)
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{
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return crypto_register_template(&crypto_cbc_tmpl);
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}
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static void __exit crypto_cbc_module_exit(void)
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{
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crypto_unregister_template(&crypto_cbc_tmpl);
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}
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subsys_initcall(crypto_cbc_module_init);
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module_exit(crypto_cbc_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("CBC block cipher mode of operation");
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MODULE_ALIAS_CRYPTO("cbc");
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