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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * ECB: Electronic CodeBook mode
- *
- * Copyright (c) 2006 Herbert Xu <[email protected]>
- */
- #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");
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