mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-01-23 00:07:07 +03:00
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
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* Cryptographic API for algorithms (i.e., low-level API).
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/rwsem.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <crypto/algapi.h>
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static LIST_HEAD(crypto_alg_list);
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static DECLARE_RWSEM(crypto_alg_sem);
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struct crypto_type {
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};
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int crypto_register_alg(struct crypto_alg *alg)
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{
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down_write(&crypto_alg_sem);
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list_add(&alg->cra_list, &crypto_alg_list);
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up_write(&crypto_alg_sem);
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return 0;
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}
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static void *crypto_alloc_tfm(const char *name,
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const struct crypto_type *type)
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{
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struct crypto_alg *alg;
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down_read(&crypto_alg_sem);
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list_for_each_entry(alg, &crypto_alg_list, cra_list)
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if (alg->cra_type == type && !strcmp(alg->cra_name, name))
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goto found;
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alg = ERR_PTR(-ENOENT);
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found:
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up_read(&crypto_alg_sem);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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return alg->alloc_tfm() ?: ERR_PTR(-ENOMEM);
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}
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/* skcipher: */
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static const struct crypto_type crypto_skcipher_type2 = {
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};
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struct crypto_skcipher *crypto_alloc_skcipher(const char *name,
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u32 type, u32 mask)
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{
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return crypto_alloc_tfm(name, &crypto_skcipher_type2);
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}
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int crypto_register_skcipher(struct skcipher_alg *alg)
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{
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alg->base.cra_type = &crypto_skcipher_type2;
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return crypto_register_alg(&alg->base);
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}
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/* shash: */
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#include <crypto/hash.h>
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static int shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned len, u8 *out)
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{
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return crypto_shash_update(desc, data, len) ?:
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crypto_shash_final(desc, out);
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}
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static int shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned len, u8 *out)
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{
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return crypto_shash_init(desc) ?:
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crypto_shash_finup(desc, data, len, out);
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}
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static const struct crypto_type crypto_shash_type = {
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};
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struct crypto_shash *crypto_alloc_shash(const char *name,
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u32 type, u32 mask)
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{
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return crypto_alloc_tfm(name, &crypto_shash_type);
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}
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int crypto_register_shash(struct shash_alg *alg)
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{
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alg->base.cra_type = &crypto_shash_type;
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if (!alg->finup)
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alg->finup = shash_finup;
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if (!alg->digest)
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alg->digest = shash_digest;
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return crypto_register_alg(&alg->base);
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}
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