cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ecb.c (2487B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ECB: Electronic CodeBook mode
      4 *
      5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
      6 */
      7
      8#include <crypto/algapi.h>
      9#include <crypto/internal/cipher.h>
     10#include <crypto/internal/skcipher.h>
     11#include <linux/err.h>
     12#include <linux/init.h>
     13#include <linux/kernel.h>
     14#include <linux/module.h>
     15
     16static int crypto_ecb_crypt(struct skcipher_request *req,
     17			    struct crypto_cipher *cipher,
     18			    void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
     19{
     20	const unsigned int bsize = crypto_cipher_blocksize(cipher);
     21	struct skcipher_walk walk;
     22	unsigned int nbytes;
     23	int err;
     24
     25	err = skcipher_walk_virt(&walk, req, false);
     26
     27	while ((nbytes = walk.nbytes) != 0) {
     28		const u8 *src = walk.src.virt.addr;
     29		u8 *dst = walk.dst.virt.addr;
     30
     31		do {
     32			fn(crypto_cipher_tfm(cipher), dst, src);
     33
     34			src += bsize;
     35			dst += bsize;
     36		} while ((nbytes -= bsize) >= bsize);
     37
     38		err = skcipher_walk_done(&walk, nbytes);
     39	}
     40
     41	return err;
     42}
     43
     44static int crypto_ecb_encrypt(struct skcipher_request *req)
     45{
     46	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
     47	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
     48
     49	return crypto_ecb_crypt(req, cipher,
     50				crypto_cipher_alg(cipher)->cia_encrypt);
     51}
     52
     53static int crypto_ecb_decrypt(struct skcipher_request *req)
     54{
     55	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
     56	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
     57
     58	return crypto_ecb_crypt(req, cipher,
     59				crypto_cipher_alg(cipher)->cia_decrypt);
     60}
     61
     62static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
     63{
     64	struct skcipher_instance *inst;
     65	int err;
     66
     67	inst = skcipher_alloc_instance_simple(tmpl, tb);
     68	if (IS_ERR(inst))
     69		return PTR_ERR(inst);
     70
     71	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
     72
     73	inst->alg.encrypt = crypto_ecb_encrypt;
     74	inst->alg.decrypt = crypto_ecb_decrypt;
     75
     76	err = skcipher_register_instance(tmpl, inst);
     77	if (err)
     78		inst->free(inst);
     79
     80	return err;
     81}
     82
     83static struct crypto_template crypto_ecb_tmpl = {
     84	.name = "ecb",
     85	.create = crypto_ecb_create,
     86	.module = THIS_MODULE,
     87};
     88
     89static int __init crypto_ecb_module_init(void)
     90{
     91	return crypto_register_template(&crypto_ecb_tmpl);
     92}
     93
     94static void __exit crypto_ecb_module_exit(void)
     95{
     96	crypto_unregister_template(&crypto_ecb_tmpl);
     97}
     98
     99subsys_initcall(crypto_ecb_module_init);
    100module_exit(crypto_ecb_module_exit);
    101
    102MODULE_LICENSE("GPL");
    103MODULE_DESCRIPTION("ECB block cipher mode of operation");
    104MODULE_ALIAS_CRYPTO("ecb");