Richard Hartmann | c9af70f | 2010-02-16 20:31:54 +0800 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Cryptographic API. |
| 3 | * |
| 4 | * Null algorithms, aka Much Ado About Nothing. |
| 5 | * |
| 6 | * These are needed for IPsec, and may be useful in general for |
| 7 | * testing & debugging. |
Richard Hartmann | c9af70f | 2010-02-16 20:31:54 +0800 | [diff] [blame] | 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * The null cipher is compliant with RFC2410. |
| 10 | * |
| 11 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | */ |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 19 | |
Horia Geanta | 72567258 | 2014-03-14 17:46:50 +0200 | [diff] [blame] | 20 | #include <crypto/null.h> |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 21 | #include <crypto/internal/hash.h> |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 22 | #include <crypto/internal/skcipher.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/init.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/mm.h> |
Patrick McHardy | d085600 | 2005-05-16 21:53:41 -0700 | [diff] [blame] | 26 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 28 | static int null_compress(struct crypto_tfm *tfm, const u8 *src, |
| 29 | unsigned int slen, u8 *dst, unsigned int *dlen) |
Patrick McHardy | d085600 | 2005-05-16 21:53:41 -0700 | [diff] [blame] | 30 | { |
| 31 | if (slen > *dlen) |
| 32 | return -EINVAL; |
| 33 | memcpy(dst, src, slen); |
| 34 | *dlen = slen; |
| 35 | return 0; |
| 36 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 38 | static int null_init(struct shash_desc *desc) |
| 39 | { |
| 40 | return 0; |
| 41 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 43 | static int null_update(struct shash_desc *desc, const u8 *data, |
| 44 | unsigned int len) |
| 45 | { |
| 46 | return 0; |
| 47 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 49 | static int null_final(struct shash_desc *desc, u8 *out) |
| 50 | { |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int null_digest(struct shash_desc *desc, const u8 *data, |
| 55 | unsigned int len, u8 *out) |
| 56 | { |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key, |
| 61 | unsigned int keylen) |
| 62 | { return 0; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 64 | static int null_setkey(struct crypto_tfm *tfm, const u8 *key, |
Herbert Xu | 560c06a | 2006-08-13 14:16:39 +1000 | [diff] [blame] | 65 | unsigned int keylen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { return 0; } |
| 67 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 68 | static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
Patrick McHardy | d085600 | 2005-05-16 21:53:41 -0700 | [diff] [blame] | 69 | { |
| 70 | memcpy(dst, src, NULL_BLOCK_SIZE); |
| 71 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 73 | static int skcipher_null_crypt(struct blkcipher_desc *desc, |
| 74 | struct scatterlist *dst, |
| 75 | struct scatterlist *src, unsigned int nbytes) |
| 76 | { |
| 77 | struct blkcipher_walk walk; |
| 78 | int err; |
| 79 | |
| 80 | blkcipher_walk_init(&walk, dst, src, nbytes); |
| 81 | err = blkcipher_walk_virt(desc, &walk); |
| 82 | |
| 83 | while (walk.nbytes) { |
| 84 | if (walk.src.virt.addr != walk.dst.virt.addr) |
| 85 | memcpy(walk.dst.virt.addr, walk.src.virt.addr, |
| 86 | walk.nbytes); |
| 87 | err = blkcipher_walk_done(desc, &walk, 0); |
| 88 | } |
| 89 | |
| 90 | return err; |
| 91 | } |
| 92 | |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 93 | static struct shash_alg digest_null = { |
| 94 | .digestsize = NULL_DIGEST_SIZE, |
| 95 | .setkey = null_hash_setkey, |
| 96 | .init = null_init, |
| 97 | .update = null_update, |
| 98 | .finup = null_digest, |
| 99 | .digest = null_digest, |
| 100 | .final = null_final, |
| 101 | .base = { |
| 102 | .cra_name = "digest_null", |
| 103 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
| 104 | .cra_blocksize = NULL_BLOCK_SIZE, |
| 105 | .cra_module = THIS_MODULE, |
| 106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | }; |
| 108 | |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 109 | static struct crypto_alg null_algs[3] = { { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | .cra_name = "cipher_null", |
| 111 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 112 | .cra_blocksize = NULL_BLOCK_SIZE, |
| 113 | .cra_ctxsize = 0, |
| 114 | .cra_module = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | .cra_u = { .cipher = { |
| 116 | .cia_min_keysize = NULL_KEY_SIZE, |
| 117 | .cia_max_keysize = NULL_KEY_SIZE, |
| 118 | .cia_setkey = null_setkey, |
Patrick McHardy | d085600 | 2005-05-16 21:53:41 -0700 | [diff] [blame] | 119 | .cia_encrypt = null_crypt, |
| 120 | .cia_decrypt = null_crypt } } |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 121 | }, { |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 122 | .cra_name = "ecb(cipher_null)", |
| 123 | .cra_driver_name = "ecb-cipher_null", |
| 124 | .cra_priority = 100, |
| 125 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
| 126 | .cra_blocksize = NULL_BLOCK_SIZE, |
| 127 | .cra_type = &crypto_blkcipher_type, |
| 128 | .cra_ctxsize = 0, |
| 129 | .cra_module = THIS_MODULE, |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 130 | .cra_u = { .blkcipher = { |
| 131 | .min_keysize = NULL_KEY_SIZE, |
| 132 | .max_keysize = NULL_KEY_SIZE, |
| 133 | .ivsize = NULL_IV_SIZE, |
| 134 | .setkey = null_setkey, |
| 135 | .encrypt = skcipher_null_crypt, |
| 136 | .decrypt = skcipher_null_crypt } } |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 137 | }, { |
| 138 | .cra_name = "compress_null", |
| 139 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
| 140 | .cra_blocksize = NULL_BLOCK_SIZE, |
| 141 | .cra_ctxsize = 0, |
| 142 | .cra_module = THIS_MODULE, |
| 143 | .cra_u = { .compress = { |
| 144 | .coa_compress = null_compress, |
| 145 | .coa_decompress = null_compress } } |
| 146 | } }; |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 147 | |
Kees Cook | 5d26a10 | 2014-11-20 17:05:53 -0800 | [diff] [blame] | 148 | MODULE_ALIAS_CRYPTO("compress_null"); |
| 149 | MODULE_ALIAS_CRYPTO("digest_null"); |
| 150 | MODULE_ALIAS_CRYPTO("cipher_null"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 152 | static int __init crypto_null_mod_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | int ret = 0; |
Richard Hartmann | c9af70f | 2010-02-16 20:31:54 +0800 | [diff] [blame] | 155 | |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 156 | ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (ret < 0) |
| 158 | goto out; |
| 159 | |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 160 | ret = crypto_register_shash(&digest_null); |
Herbert Xu | 3631c65 | 2007-12-13 22:28:59 +0800 | [diff] [blame] | 161 | if (ret < 0) |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 162 | goto out_unregister_algs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 164 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 166 | out_unregister_algs: |
| 167 | crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
Richard Hartmann | c9af70f | 2010-02-16 20:31:54 +0800 | [diff] [blame] | 168 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return ret; |
| 170 | } |
| 171 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 172 | static void __exit crypto_null_mod_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Herbert Xu | d35d245 | 2008-11-08 08:09:56 +0800 | [diff] [blame] | 174 | crypto_unregister_shash(&digest_null); |
Jussi Kivilinna | 70a03bf | 2012-07-11 14:20:00 +0300 | [diff] [blame] | 175 | crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 178 | module_init(crypto_null_mod_init); |
| 179 | module_exit(crypto_null_mod_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | MODULE_LICENSE("GPL"); |
| 182 | MODULE_DESCRIPTION("Null Cryptographic Algorithms"); |