diff options
Diffstat (limited to 'c_src/linux/crypto/api.c')
-rw-r--r-- | c_src/linux/crypto/api.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/c_src/linux/crypto/api.c b/c_src/linux/crypto/api.c new file mode 100644 index 00000000..2f3ab2b5 --- /dev/null +++ b/c_src/linux/crypto/api.c @@ -0,0 +1,114 @@ +/* + * Cryptographic API for algorithms (i.e., low-level API). + * + * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.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 <linux/device.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/rwsem.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include <crypto/algapi.h> + +static LIST_HEAD(crypto_alg_list); +static DECLARE_RWSEM(crypto_alg_sem); + +struct crypto_type { +}; + +int crypto_register_alg(struct crypto_alg *alg) +{ + down_write(&crypto_alg_sem); + list_add(&alg->cra_list, &crypto_alg_list); + up_write(&crypto_alg_sem); + + return 0; +} + +static void *crypto_alloc_tfm(const char *name, + const struct crypto_type *type) +{ + struct crypto_alg *alg; + + down_read(&crypto_alg_sem); + list_for_each_entry(alg, &crypto_alg_list, cra_list) + if (alg->cra_type == type && !strcmp(alg->cra_name, name)) + goto found; + + alg = ERR_PTR(-ENOENT); +found: + up_read(&crypto_alg_sem); + + if (IS_ERR(alg)) + return ERR_CAST(alg); + + return alg->alloc_tfm() ?: ERR_PTR(-ENOMEM); +} + +/* skcipher: */ + +static const struct crypto_type crypto_skcipher_type2 = { +}; + +struct crypto_skcipher *crypto_alloc_skcipher(const char *name, + u32 type, u32 mask) +{ + return crypto_alloc_tfm(name, &crypto_skcipher_type2); +} + +int crypto_register_skcipher(struct skcipher_alg *alg) +{ + alg->base.cra_type = &crypto_skcipher_type2; + + return crypto_register_alg(&alg->base); +} + +/* shash: */ + +#include <crypto/hash.h> + +static int shash_finup(struct shash_desc *desc, const u8 *data, + unsigned len, u8 *out) +{ + return crypto_shash_update(desc, data, len) ?: + crypto_shash_final(desc, out); +} + +static int shash_digest(struct shash_desc *desc, const u8 *data, + unsigned len, u8 *out) +{ + return crypto_shash_init(desc) ?: + crypto_shash_finup(desc, data, len, out); +} + +static const struct crypto_type crypto_shash_type = { +}; + +struct crypto_shash *crypto_alloc_shash(const char *name, + u32 type, u32 mask) +{ + return crypto_alloc_tfm(name, &crypto_shash_type); +} + +int crypto_register_shash(struct shash_alg *alg) +{ + alg->base.cra_type = &crypto_shash_type; + + if (!alg->finup) + alg->finup = shash_finup; + if (!alg->digest) + alg->digest = shash_digest; + + return crypto_register_alg(&alg->base); +} |