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/*
* Symmetric key ciphers.
*
* Copyright (c) 2007-2015 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_SKCIPHER_H
#define _CRYPTO_SKCIPHER_H
#include <linux/crypto.h>
struct crypto_skcipher;
struct skcipher_request;
struct skcipher_alg {
struct crypto_alg base;
};
int crypto_register_skcipher(struct skcipher_alg *alg);
struct crypto_skcipher {
int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int (*encrypt)(struct skcipher_request *req);
int (*decrypt)(struct skcipher_request *req);
unsigned ivsize;
unsigned keysize;
struct crypto_tfm base;
};
struct crypto_sync_skcipher {
struct crypto_skcipher base;
};
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
u32 type, u32 mask);
static inline struct crypto_sync_skcipher *
crypto_alloc_sync_skcipher(const char *alg_name, u32 type, u32 mask)
{
return (void *) crypto_alloc_skcipher(alg_name, type, mask);
}
static inline void crypto_free_skcipher(struct crypto_skcipher *tfm)
{
kfree(tfm);
}
static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm)
{
crypto_free_skcipher(&tfm->base);
}
struct skcipher_request {
unsigned cryptlen;
u8 *iv;
struct scatterlist *src;
struct scatterlist *dst;
struct crypto_tfm *tfm;
};
#define MAX_SYNC_SKCIPHER_REQSIZE 384
#define SYNC_SKCIPHER_REQUEST_ON_STACK(name, tfm) \
char __##name##_desc[sizeof(struct skcipher_request) + \
MAX_SYNC_SKCIPHER_REQSIZE + \
(!(sizeof((struct crypto_sync_skcipher *)1 == \
(typeof(tfm))1))) \
] CRYPTO_MINALIGN_ATTR; \
struct skcipher_request *name = (void *)__##name##_desc
static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
return tfm->setkey(tfm, key, keylen);
}
static inline struct crypto_skcipher *crypto_skcipher_reqtfm(
struct skcipher_request *req)
{
return container_of(req->tfm, struct crypto_skcipher, base);
}
static inline int crypto_skcipher_encrypt(struct skcipher_request *req)
{
return crypto_skcipher_reqtfm(req)->encrypt(req);
}
static inline int crypto_skcipher_decrypt(struct skcipher_request *req)
{
return crypto_skcipher_reqtfm(req)->decrypt(req);
}
static inline void skcipher_request_set_tfm(struct skcipher_request *req,
struct crypto_skcipher *tfm)
{
req->tfm = &tfm->base;
}
static inline void skcipher_request_set_sync_tfm(struct skcipher_request *req,
struct crypto_sync_skcipher *tfm)
{
skcipher_request_set_tfm(req, &tfm->base);
}
static inline void skcipher_request_set_crypt(
struct skcipher_request *req,
struct scatterlist *src, struct scatterlist *dst,
unsigned int cryptlen, void *iv)
{
req->src = src;
req->dst = dst;
req->cryptlen = cryptlen;
req->iv = iv;
}
#endif /* _CRYPTO_SKCIPHER_H */
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