// 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/cipher.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");