1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * ECB: Electronic CodeBook mode
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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>
15 static int crypto_ecb_crypt(struct skcipher_request *req,
16 struct crypto_cipher *cipher,
17 void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
19 const unsigned int bsize = crypto_cipher_blocksize(cipher);
20 struct skcipher_walk walk;
24 err = skcipher_walk_virt(&walk, req, false);
26 while ((nbytes = walk.nbytes) != 0) {
27 const u8 *src = walk.src.virt.addr;
28 u8 *dst = walk.dst.virt.addr;
31 fn(crypto_cipher_tfm(cipher), dst, src);
35 } while ((nbytes -= bsize) >= bsize);
37 err = skcipher_walk_done(&walk, nbytes);
43 static int crypto_ecb_encrypt(struct skcipher_request *req)
45 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
46 struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
48 return crypto_ecb_crypt(req, cipher,
49 crypto_cipher_alg(cipher)->cia_encrypt);
52 static int crypto_ecb_decrypt(struct skcipher_request *req)
54 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
55 struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
57 return crypto_ecb_crypt(req, cipher,
58 crypto_cipher_alg(cipher)->cia_decrypt);
61 static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
63 struct skcipher_instance *inst;
66 inst = skcipher_alloc_instance_simple(tmpl, tb);
70 inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
72 inst->alg.encrypt = crypto_ecb_encrypt;
73 inst->alg.decrypt = crypto_ecb_decrypt;
75 err = skcipher_register_instance(tmpl, inst);
82 static struct crypto_template crypto_ecb_tmpl = {
84 .create = crypto_ecb_create,
85 .module = THIS_MODULE,
88 static int __init crypto_ecb_module_init(void)
90 return crypto_register_template(&crypto_ecb_tmpl);
93 static void __exit crypto_ecb_module_exit(void)
95 crypto_unregister_template(&crypto_ecb_tmpl);
98 subsys_initcall(crypto_ecb_module_init);
99 module_exit(crypto_ecb_module_exit);
101 MODULE_LICENSE("GPL");
102 MODULE_DESCRIPTION("ECB block cipher mode of operation");
103 MODULE_ALIAS_CRYPTO("ecb");