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225 lines
5.3 KiB
225 lines
5.3 KiB
// 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 <[email protected]> |
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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_driver_name = "digest_null-generic", |
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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_driver_name = "cipher_null-generic", |
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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_driver_name = "compress_null-generic", |
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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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