// 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; struct crypto_alg *alg; int err; inst = skcipher_alloc_instance_simple(tmpl, tb, &alg); 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); crypto_mod_put(alg); 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");