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crypto/crypto_null.c
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/* |
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* Cryptographic API. * * Null algorithms, aka Much Ado About Nothing. * * These are needed for IPsec, and may be useful in general for * testing & debugging. |
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* |
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* The null cipher is compliant with RFC2410. * * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * * 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. * */ |
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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> #include <linux/module.h> #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_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, unsigned int slen, u8 *dst, unsigned int *dlen) |
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{ if (slen > *dlen) return -EINVAL; memcpy(dst, src, slen); *dlen = slen; return 0; } |
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static int null_init(struct shash_desc *desc) { return 0; } |
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static int null_update(struct shash_desc *desc, const u8 *data, unsigned int len) { return 0; } |
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static int null_final(struct shash_desc *desc, u8 *out) { return 0; } static int null_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return 0; } static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { 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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{ memcpy(dst, src, NULL_BLOCK_SIZE); } |
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static int skcipher_null_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct blkcipher_walk walk; int err; blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); while (walk.nbytes) { if (walk.src.virt.addr != walk.dst.virt.addr) memcpy(walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes); err = blkcipher_walk_done(desc, &walk, 0); } return err; } |
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static struct shash_alg digest_null = { .digestsize = NULL_DIGEST_SIZE, .setkey = null_hash_setkey, .init = null_init, .update = null_update, .finup = null_digest, .digest = null_digest, .final = null_final, .base = { .cra_name = "digest_null", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = NULL_BLOCK_SIZE, .cra_module = THIS_MODULE, } |
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}; |
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static struct crypto_alg null_algs[3] = { { |
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.cra_name = "cipher_null", .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = NULL_BLOCK_SIZE, .cra_ctxsize = 0, .cra_module = THIS_MODULE, |
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.cra_u = { .cipher = { .cia_min_keysize = NULL_KEY_SIZE, .cia_max_keysize = NULL_KEY_SIZE, .cia_setkey = null_setkey, |
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.cia_encrypt = null_crypt, .cia_decrypt = null_crypt } } |
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}, { |
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.cra_name = "ecb(cipher_null)", .cra_driver_name = "ecb-cipher_null", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, .cra_blocksize = NULL_BLOCK_SIZE, .cra_type = &crypto_blkcipher_type, .cra_ctxsize = 0, .cra_module = THIS_MODULE, |
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.cra_u = { .blkcipher = { .min_keysize = NULL_KEY_SIZE, .max_keysize = NULL_KEY_SIZE, .ivsize = NULL_IV_SIZE, .setkey = null_setkey, .encrypt = skcipher_null_crypt, .decrypt = skcipher_null_crypt } } |
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}, { .cra_name = "compress_null", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, .cra_blocksize = NULL_BLOCK_SIZE, .cra_ctxsize = 0, .cra_module = THIS_MODULE, .cra_u = { .compress = { .coa_compress = null_compress, .coa_decompress = null_compress } } } }; |
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MODULE_ALIAS_CRYPTO("compress_null"); MODULE_ALIAS_CRYPTO("digest_null"); MODULE_ALIAS_CRYPTO("cipher_null"); |
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struct crypto_skcipher *crypto_get_default_null_skcipher(void) |
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{ |
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struct crypto_skcipher *tfm; |
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mutex_lock(&crypto_default_null_skcipher_lock); tfm = crypto_default_null_skcipher; if (!tfm) { |
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tfm = crypto_alloc_skcipher("ecb(cipher_null)", 0, CRYPTO_ALG_ASYNC); |
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if (IS_ERR(tfm)) goto unlock; crypto_default_null_skcipher = tfm; } crypto_default_null_skcipher_refcnt++; unlock: mutex_unlock(&crypto_default_null_skcipher_lock); return tfm; } EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher); void crypto_put_default_null_skcipher(void) { mutex_lock(&crypto_default_null_skcipher_lock); if (!--crypto_default_null_skcipher_refcnt) { |
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crypto_free_skcipher(crypto_default_null_skcipher); |
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crypto_default_null_skcipher = NULL; } mutex_unlock(&crypto_default_null_skcipher_lock); } EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher); |
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static int __init crypto_null_mod_init(void) |
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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) 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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return 0; |
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out_unregister_algs: crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
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out: |
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return ret; } |
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static void __exit crypto_null_mod_fini(void) |
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{ |
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crypto_unregister_shash(&digest_null); |
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crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
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} |
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module_init(crypto_null_mod_init); module_exit(crypto_null_mod_fini); |
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MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Null Cryptographic Algorithms"); |