[mirror_ubuntu-hirsute-kernel.git] / crypto / ecb.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ECB: Electronic CodeBook mode
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>

static int crypto_ecb_crypt(struct skcipher_request *req,
			    struct crypto_cipher *cipher,
			    void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
{
	const unsigned int bsize = crypto_cipher_blocksize(cipher);
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes) != 0) {
		const u8 *src = walk.src.virt.addr;
		u8 *dst = walk.dst.virt.addr;

		do {
			fn(crypto_cipher_tfm(cipher), dst, src);

			src += bsize;
			dst += bsize;
		} while ((nbytes -= bsize) >= bsize);

		err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
}

static int crypto_ecb_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);

	return crypto_ecb_crypt(req, cipher,
				crypto_cipher_alg(cipher)->cia_encrypt);
}

static int crypto_ecb_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);

	return crypto_ecb_crypt(req, cipher,
				crypto_cipher_alg(cipher)->cia_decrypt);
}

static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct skcipher_instance *inst;
	int err;

	inst = skcipher_alloc_instance_simple(tmpl, tb);
	if (IS_ERR(inst))
		return PTR_ERR(inst);

	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */

	inst->alg.encrypt = crypto_ecb_encrypt;
	inst->alg.decrypt = crypto_ecb_decrypt;

	err = skcipher_register_instance(tmpl, inst);
	if (err)
		inst->free(inst);

	return err;
}

static struct crypto_template crypto_ecb_tmpl = {
	.name = "ecb",
	.create = crypto_ecb_create,
	.module = THIS_MODULE,
};

static int __init crypto_ecb_module_init(void)
{
	return crypto_register_template(&crypto_ecb_tmpl);
}

static void __exit crypto_ecb_module_exit(void)
{
	crypto_unregister_template(&crypto_ecb_tmpl);
}

subsys_initcall(crypto_ecb_module_init);
module_exit(crypto_ecb_module_exit);

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