cregit-Linux how code gets into the kernel

Release 4.12 crypto/crypto_null.c

Directory: crypto
/*
 * Cryptographic API.
 *
 * Null algorithms, aka Much Ado About Nothing.
 *
 * These are needed for IPsec, and may be useful in general for
 * testing & debugging.
 *
 * 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.
 *
 */

#include <crypto/null.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/string.h>

static DEFINE_MUTEX(crypto_default_null_skcipher_lock);

static struct crypto_skcipher *crypto_default_null_skcipher;

static int crypto_default_null_skcipher_refcnt;


static int null_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { if (slen > *dlen) return -EINVAL; memcpy(dst, src, slen); *dlen = slen; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris3052.63%125.00%
Patrick McHardy2035.09%125.00%
David S. Miller47.02%125.00%
Herbert Xu35.26%125.00%
Total57100.00%4100.00%


static int null_init(struct shash_desc *desc) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu964.29%266.67%
David S. Miller535.71%133.33%
Total14100.00%3100.00%


static int null_update(struct shash_desc *desc, const u8 *data, unsigned int len) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1460.87%133.33%
Herbert Xu939.13%266.67%
Total23100.00%3100.00%


static int null_final(struct shash_desc *desc, u8 *out) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller950.00%133.33%
Herbert Xu950.00%266.67%
Total18100.00%3100.00%


static int null_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu27100.00%1100.00%
Total27100.00%1100.00%


static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu23100.00%1100.00%
Total23100.00%1100.00%


static int null_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller2086.96%150.00%
Herbert Xu313.04%150.00%
Total23100.00%2100.00%


static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { memcpy(dst, src, NULL_BLOCK_SIZE); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1655.17%133.33%
Patrick McHardy1034.48%133.33%
Herbert Xu310.34%133.33%
Total29100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu118100.00%1100.00%
Total118100.00%1100.00%

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, } }; static struct crypto_alg null_algs[3] = { { .cra_name = "cipher_null", .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = NULL_BLOCK_SIZE, .cra_ctxsize = 0, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = NULL_KEY_SIZE, .cia_max_keysize = NULL_KEY_SIZE, .cia_setkey = null_setkey, .cia_encrypt = null_crypt, .cia_decrypt = null_crypt } } }, { .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, .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 } } }, { .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 } } } }; MODULE_ALIAS_CRYPTO("compress_null"); MODULE_ALIAS_CRYPTO("digest_null"); MODULE_ALIAS_CRYPTO("cipher_null");
struct crypto_skcipher *crypto_get_default_null_skcipher(void) { struct crypto_skcipher *tfm; mutex_lock(&crypto_default_null_skcipher_lock); tfm = crypto_default_null_skcipher; if (!tfm) { tfm = crypto_alloc_skcipher("ecb(cipher_null)", 0, CRYPTO_ALG_ASYNC); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu70100.00%2100.00%
Total70100.00%2100.00%

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) { crypto_free_skcipher(crypto_default_null_skcipher); crypto_default_null_skcipher = NULL; } mutex_unlock(&crypto_default_null_skcipher_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu36100.00%2100.00%
Total36100.00%2100.00%

EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
static int __init crypto_null_mod_init(void) { int ret = 0; ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs)); if (ret < 0) goto out; ret = crypto_register_shash(&digest_null); if (ret < 0) goto out_unregister_algs; return 0; out_unregister_algs: crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3447.22%120.00%
Jussi Kivilinna1926.39%120.00%
Herbert Xu1825.00%240.00%
Kamalesh Babulal11.39%120.00%
Total72100.00%5100.00%


static void __exit crypto_null_mod_fini(void) { crypto_unregister_shash(&digest_null); crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1664.00%120.00%
Jussi Kivilinna624.00%120.00%
Herbert Xu28.00%240.00%
Kamalesh Babulal14.00%120.00%
Total25100.00%5100.00%

module_init(crypto_null_mod_init); module_exit(crypto_null_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Null Cryptographic Algorithms");

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu47553.55%640.00%
David S. Miller24527.62%16.67%
Jussi Kivilinna798.91%16.67%
Patrick McHardy353.95%16.67%
James Morris303.38%16.67%
Michal Ludvig121.35%16.67%
Kamalesh Babulal40.45%16.67%
Kees Cook30.34%16.67%
Horia Geantă30.34%16.67%
Richard Hartmann10.11%16.67%
Total887100.00%15100.00%
Directory: crypto
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