| 1 | |
| 2 | |
| 3 | * Cryptographic API.
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| 4 | *
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| 5 | * Null algorithms, aka Much Ado About Nothing.
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| 6 | *
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| 7 | * These are needed for IPsec, and may be useful in general for
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| 8 | * testing & debugging.
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| 9 | *
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| 10 | * The null cipher is compliant with RFC2410.
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| 11 | *
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| 12 | * Copyright (c) 2002 James Morris <[email protected]>
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| 13 |
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| 14 |
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| 15 | #include <crypto/null.h>
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| 16 | #include <crypto/internal/hash.h>
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| 17 | #include <crypto/internal/skcipher.h>
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| 18 | #include <crypto/scatterwalk.h>
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| 19 | #include <linux/init.h>
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| 20 | #include <linux/module.h>
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| 21 | #include <linux/string.h>
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| 22 |
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| 23 | static int null_init(struct shash_desc *desc)
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| 24 | {
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| 25 | return 0;
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| 26 | }
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| 27 |
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| 28 | static int null_update(struct shash_desc *desc, const u8 *data,
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| 29 | unsigned int len)
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| 30 | {
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| 31 | return 0;
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| 32 | }
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| 33 |
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| 34 | static int null_final(struct shash_desc *desc, u8 *out)
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| 35 | {
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| 36 | return 0;
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| 37 | }
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| 38 |
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| 39 | static int null_digest(struct shash_desc *desc, const u8 *data,
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| 40 | unsigned int len, u8 *out)
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| 41 | {
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| 42 | return 0;
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| 43 | }
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| 44 |
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| 45 | static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
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| 46 | unsigned int keylen)
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| 47 | { return 0; }
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| 48 |
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| 49 | static int null_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
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| 50 | unsigned int keylen)
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| 51 | { return 0; }
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| 52 |
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| 53 | static int null_skcipher_crypt(struct skcipher_request *req)
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| 54 | {
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| 55 | if (req->src != req->dst)
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| 56 | memcpy_sglist(req->dst, req->src, req->cryptlen);
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| 57 | return 0;
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| 58 | }
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| 59 |
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| 60 | static struct shash_alg digest_null = {
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| 61 | .digestsize = NULL_DIGEST_SIZE,
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| 62 | .setkey = null_hash_setkey,
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| 63 | .init = null_init,
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| 64 | .update = null_update,
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| 65 | .finup = null_digest,
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| 66 | .digest = null_digest,
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| 67 | .final = null_final,
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| 68 | .base = {
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| 69 | .cra_name = "digest_null",
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| 70 | .cra_driver_name = "digest_null-generic",
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| 71 | .cra_blocksize = NULL_BLOCK_SIZE,
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| 72 | .cra_module = THIS_MODULE,
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| 73 | }
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| 74 | };
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| 75 |
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| 76 | static struct skcipher_alg skcipher_null = {
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| 77 | .base.cra_name = "ecb(cipher_null)",
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| 78 | .base.cra_driver_name = "ecb-cipher_null",
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| 79 | .base.cra_priority = 100,
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| 80 | .base.cra_blocksize = NULL_BLOCK_SIZE,
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| 81 | .base.cra_ctxsize = 0,
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| 82 | .base.cra_module = THIS_MODULE,
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| 83 | .min_keysize = NULL_KEY_SIZE,
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| 84 | .max_keysize = NULL_KEY_SIZE,
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| 85 | .ivsize = NULL_IV_SIZE,
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| 86 | .setkey = null_skcipher_setkey,
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| 87 | .encrypt = null_skcipher_crypt,
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| 88 | .decrypt = null_skcipher_crypt,
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| 89 | };
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| 90 |
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| 91 | MODULE_ALIAS_CRYPTO("digest_null");
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| 92 | MODULE_ALIAS_CRYPTO("ecb(cipher_null)");
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| 93 |
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| 94 | static int __init crypto_null_mod_init(void)
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| 95 | {
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| 96 | int ret = 0;
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| 97 |
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| 98 | ret = crypto_register_shash(&digest_null);
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| 99 | if (ret < 0)
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| 100 | goto out;
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| 101 |
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| 102 | ret = crypto_register_skcipher(&skcipher_null);
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| 103 | if (ret < 0)
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| 104 | goto out_unregister_shash;
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| 105 |
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| 106 | return 0;
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| 107 |
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| 108 | out_unregister_shash:
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| 109 | crypto_unregister_shash(&digest_null);
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| 110 | out:
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| 111 | return ret;
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| 112 | }
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| 113 |
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| 114 | static void __exit crypto_null_mod_fini(void)
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| 115 | {
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| 116 | crypto_unregister_shash(&digest_null);
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| 117 | crypto_unregister_skcipher(&skcipher_null);
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| 118 | }
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| 119 |
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| 120 | module_init(crypto_null_mod_init);
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| 121 | module_exit(crypto_null_mod_fini);
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| 122 |
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| 123 | MODULE_LICENSE("GPL");
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| 124 | MODULE_DESCRIPTION("Null Cryptographic Algorithms");
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