![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
223 lines
5.2 KiB
C
223 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API.
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*
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* Null algorithms, aka Much Ado About Nothing.
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*
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* These are needed for IPsec, and may be useful in general for
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* testing & debugging.
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*
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* The null cipher is compliant with RFC2410.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*/
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#include <crypto/null.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
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static struct crypto_sync_skcipher *crypto_default_null_skcipher;
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static int crypto_default_null_skcipher_refcnt;
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static int null_compress(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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if (slen > *dlen)
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return -EINVAL;
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memcpy(dst, src, slen);
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*dlen = slen;
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return 0;
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}
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static int null_init(struct shash_desc *desc)
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{
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return 0;
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}
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static int null_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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return 0;
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}
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static int null_final(struct shash_desc *desc, u8 *out)
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{
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return 0;
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}
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static int null_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return 0;
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}
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static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static int null_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{ return 0; }
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static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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memcpy(dst, src, NULL_BLOCK_SIZE);
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}
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static int null_skcipher_crypt(struct skcipher_request *req)
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{
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes) {
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if (walk.src.virt.addr != walk.dst.virt.addr)
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memcpy(walk.dst.virt.addr, walk.src.virt.addr,
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walk.nbytes);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static struct shash_alg digest_null = {
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.digestsize = NULL_DIGEST_SIZE,
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.setkey = null_hash_setkey,
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.init = null_init,
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.update = null_update,
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.finup = null_digest,
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.digest = null_digest,
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.final = null_final,
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.base = {
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.cra_name = "digest_null",
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct skcipher_alg skcipher_null = {
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.base.cra_name = "ecb(cipher_null)",
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.base.cra_driver_name = "ecb-cipher_null",
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.base.cra_priority = 100,
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.base.cra_blocksize = NULL_BLOCK_SIZE,
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.base.cra_ctxsize = 0,
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.base.cra_module = THIS_MODULE,
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.min_keysize = NULL_KEY_SIZE,
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.max_keysize = NULL_KEY_SIZE,
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.ivsize = NULL_IV_SIZE,
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.setkey = null_skcipher_setkey,
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.encrypt = null_skcipher_crypt,
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.decrypt = null_skcipher_crypt,
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};
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static struct crypto_alg null_algs[] = { {
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.cra_name = "cipher_null",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_u = { .cipher = {
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.cia_min_keysize = NULL_KEY_SIZE,
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.cia_max_keysize = NULL_KEY_SIZE,
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.cia_setkey = null_setkey,
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.cia_encrypt = null_crypt,
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.cia_decrypt = null_crypt } }
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}, {
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.cra_name = "compress_null",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_u = { .compress = {
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.coa_compress = null_compress,
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.coa_decompress = null_compress } }
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} };
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MODULE_ALIAS_CRYPTO("compress_null");
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MODULE_ALIAS_CRYPTO("digest_null");
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MODULE_ALIAS_CRYPTO("cipher_null");
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struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void)
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{
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struct crypto_sync_skcipher *tfm;
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mutex_lock(&crypto_default_null_skcipher_lock);
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tfm = crypto_default_null_skcipher;
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if (!tfm) {
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tfm = crypto_alloc_sync_skcipher("ecb(cipher_null)", 0, 0);
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if (IS_ERR(tfm))
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goto unlock;
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crypto_default_null_skcipher = tfm;
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}
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crypto_default_null_skcipher_refcnt++;
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unlock:
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mutex_unlock(&crypto_default_null_skcipher_lock);
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return tfm;
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}
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EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher);
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void crypto_put_default_null_skcipher(void)
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{
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mutex_lock(&crypto_default_null_skcipher_lock);
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if (!--crypto_default_null_skcipher_refcnt) {
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crypto_free_sync_skcipher(crypto_default_null_skcipher);
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crypto_default_null_skcipher = NULL;
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}
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mutex_unlock(&crypto_default_null_skcipher_lock);
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}
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EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
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static int __init crypto_null_mod_init(void)
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{
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int ret = 0;
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ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
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if (ret < 0)
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goto out;
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ret = crypto_register_shash(&digest_null);
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if (ret < 0)
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goto out_unregister_algs;
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ret = crypto_register_skcipher(&skcipher_null);
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if (ret < 0)
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goto out_unregister_shash;
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return 0;
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out_unregister_shash:
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crypto_unregister_shash(&digest_null);
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out_unregister_algs:
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crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
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out:
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return ret;
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}
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static void __exit crypto_null_mod_fini(void)
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{
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crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
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crypto_unregister_shash(&digest_null);
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crypto_unregister_skcipher(&skcipher_null);
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}
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subsys_initcall(crypto_null_mod_init);
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module_exit(crypto_null_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Null Cryptographic Algorithms");
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