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104 lines
2.4 KiB
104 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ECB: Electronic CodeBook mode |
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* |
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* Copyright (c) 2006 Herbert Xu <[email protected]> |
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*/ |
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#include <crypto/algapi.h> |
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#include <crypto/internal/cipher.h> |
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#include <crypto/internal/skcipher.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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static int crypto_ecb_crypt(struct skcipher_request *req, |
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struct crypto_cipher *cipher, |
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *)) |
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{ |
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const unsigned int bsize = crypto_cipher_blocksize(cipher); |
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struct skcipher_walk walk; |
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unsigned int nbytes; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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while ((nbytes = walk.nbytes) != 0) { |
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const u8 *src = walk.src.virt.addr; |
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u8 *dst = walk.dst.virt.addr; |
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do { |
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fn(crypto_cipher_tfm(cipher), dst, src); |
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src += bsize; |
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dst += bsize; |
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} while ((nbytes -= bsize) >= bsize); |
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err = skcipher_walk_done(&walk, nbytes); |
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} |
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return err; |
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} |
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static int crypto_ecb_encrypt(struct skcipher_request *req) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); |
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return crypto_ecb_crypt(req, cipher, |
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crypto_cipher_alg(cipher)->cia_encrypt); |
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} |
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static int crypto_ecb_decrypt(struct skcipher_request *req) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); |
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return crypto_ecb_crypt(req, cipher, |
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crypto_cipher_alg(cipher)->cia_decrypt); |
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} |
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static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb) |
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{ |
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struct skcipher_instance *inst; |
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int err; |
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inst = skcipher_alloc_instance_simple(tmpl, tb); |
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if (IS_ERR(inst)) |
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return PTR_ERR(inst); |
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inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */ |
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inst->alg.encrypt = crypto_ecb_encrypt; |
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inst->alg.decrypt = crypto_ecb_decrypt; |
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err = skcipher_register_instance(tmpl, inst); |
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if (err) |
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inst->free(inst); |
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return err; |
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} |
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static struct crypto_template crypto_ecb_tmpl = { |
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.name = "ecb", |
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.create = crypto_ecb_create, |
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.module = THIS_MODULE, |
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}; |
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static int __init crypto_ecb_module_init(void) |
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{ |
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return crypto_register_template(&crypto_ecb_tmpl); |
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} |
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static void __exit crypto_ecb_module_exit(void) |
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{ |
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crypto_unregister_template(&crypto_ecb_tmpl); |
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} |
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subsys_initcall(crypto_ecb_module_init); |
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module_exit(crypto_ecb_module_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("ECB block cipher mode of operation"); |
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MODULE_ALIAS_CRYPTO("ecb");
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