linux/include/crypto/internal/skcipher.h

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/*
* Symmetric key ciphers.
*
* Copyright (c) 2007 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.
*
*/
#ifndef _CRYPTO_INTERNAL_SKCIPHER_H
#define _CRYPTO_INTERNAL_SKCIPHER_H
#include <crypto/algapi.h>
[CRYPTO] skcipher: Add givcrypt operations and givcipher type Different block cipher modes have different requirements for intialisation vectors. For example, CBC can use a simple randomly generated IV while modes such as CTR must use an IV generation mechanisms that give a stronger guarantee on the lack of collisions. Furthermore, disk encryption modes have their own IV generation algorithms. Up until now IV generation has been left to the users of the symmetric key cipher API. This is inconvenient as the number of block cipher modes increase because the user needs to be aware of which mode is supposed to be paired with which IV generation algorithm. Therefore it makes sense to integrate the IV generation into the crypto API. This patch takes the first step in that direction by creating two new ablkcipher operations, givencrypt and givdecrypt that generates an IV before performing the actual encryption or decryption. The operations are currently not exposed to the user. That will be done once the underlying functionality has actually been implemented. It also creates the underlying givcipher type. Algorithms that directly generate IVs would use it instead of ablkcipher. All other algorithms (including all existing ones) would generate a givcipher algorithm upon registration. This givcipher algorithm will be constructed from the geniv string that's stored in every algorithm. That string will locate a template which is instantiated by the blkcipher/ablkcipher algorithm in question to give a givcipher algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-12-17 13:51:27 +00:00
#include <crypto/skcipher.h>
#include <linux/types.h>
struct rtattr;
struct crypto_skcipher_spawn {
struct crypto_spawn base;
};
[CRYPTO] skcipher: Add givcrypt operations and givcipher type Different block cipher modes have different requirements for intialisation vectors. For example, CBC can use a simple randomly generated IV while modes such as CTR must use an IV generation mechanisms that give a stronger guarantee on the lack of collisions. Furthermore, disk encryption modes have their own IV generation algorithms. Up until now IV generation has been left to the users of the symmetric key cipher API. This is inconvenient as the number of block cipher modes increase because the user needs to be aware of which mode is supposed to be paired with which IV generation algorithm. Therefore it makes sense to integrate the IV generation into the crypto API. This patch takes the first step in that direction by creating two new ablkcipher operations, givencrypt and givdecrypt that generates an IV before performing the actual encryption or decryption. The operations are currently not exposed to the user. That will be done once the underlying functionality has actually been implemented. It also creates the underlying givcipher type. Algorithms that directly generate IVs would use it instead of ablkcipher. All other algorithms (including all existing ones) would generate a givcipher algorithm upon registration. This givcipher algorithm will be constructed from the geniv string that's stored in every algorithm. That string will locate a template which is instantiated by the blkcipher/ablkcipher algorithm in question to give a givcipher algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-12-17 13:51:27 +00:00
extern const struct crypto_type crypto_givcipher_type;
static inline void crypto_set_skcipher_spawn(
struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
{
crypto_set_spawn(&spawn->base, inst);
}
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask);
static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
{
crypto_drop_spawn(&spawn->base);
}
static inline struct crypto_alg *crypto_skcipher_spawn_alg(
struct crypto_skcipher_spawn *spawn)
{
return spawn->base.alg;
}
static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
struct crypto_skcipher_spawn *spawn)
{
return __crypto_ablkcipher_cast(
crypto_spawn_tfm(&spawn->base, crypto_skcipher_type(0),
crypto_skcipher_mask(0)));
}
int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req);
int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req);
const char *crypto_default_geniv(const struct crypto_alg *alg);
struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type,
u32 mask);
void skcipher_geniv_free(struct crypto_instance *inst);
int skcipher_geniv_init(struct crypto_tfm *tfm);
void skcipher_geniv_exit(struct crypto_tfm *tfm);
static inline struct crypto_ablkcipher *skcipher_geniv_cipher(
struct crypto_ablkcipher *geniv)
{
return crypto_ablkcipher_crt(geniv)->base;
}
static inline int skcipher_enqueue_givcrypt(
struct crypto_queue *queue, struct skcipher_givcrypt_request *request)
{
return ablkcipher_enqueue_request(queue, &request->creq);
}
static inline struct skcipher_givcrypt_request *skcipher_dequeue_givcrypt(
struct crypto_queue *queue)
{
return __crypto_dequeue_request(
queue, offsetof(struct skcipher_givcrypt_request, creq.base));
}
[CRYPTO] skcipher: Add givcrypt operations and givcipher type Different block cipher modes have different requirements for intialisation vectors. For example, CBC can use a simple randomly generated IV while modes such as CTR must use an IV generation mechanisms that give a stronger guarantee on the lack of collisions. Furthermore, disk encryption modes have their own IV generation algorithms. Up until now IV generation has been left to the users of the symmetric key cipher API. This is inconvenient as the number of block cipher modes increase because the user needs to be aware of which mode is supposed to be paired with which IV generation algorithm. Therefore it makes sense to integrate the IV generation into the crypto API. This patch takes the first step in that direction by creating two new ablkcipher operations, givencrypt and givdecrypt that generates an IV before performing the actual encryption or decryption. The operations are currently not exposed to the user. That will be done once the underlying functionality has actually been implemented. It also creates the underlying givcipher type. Algorithms that directly generate IVs would use it instead of ablkcipher. All other algorithms (including all existing ones) would generate a givcipher algorithm upon registration. This givcipher algorithm will be constructed from the geniv string that's stored in every algorithm. That string will locate a template which is instantiated by the blkcipher/ablkcipher algorithm in question to give a givcipher algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-12-17 13:51:27 +00:00
static inline void *skcipher_givcrypt_reqctx(
struct skcipher_givcrypt_request *req)
{
return ablkcipher_request_ctx(&req->creq);
}
static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
int err)
{
req->base.complete(&req->base, err);
}
static inline void skcipher_givcrypt_complete(
struct skcipher_givcrypt_request *req, int err)
{
ablkcipher_request_complete(&req->creq, err);
}
static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
{
return req->base.flags;
}
#endif /* _CRYPTO_INTERNAL_SKCIPHER_H */