skcipher.h

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/*
 * Symmetric key ciphers.
 * 
 * Copyright (c) 2007 Herbert Xu <[email protected]>
 *
 * 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>
#include <linux/kernel.h>
#include <linux/slab.h>

struct skcipher_givcrypt_request {
    u64 seq;
    u8 *giv;

    struct ablkcipher_request creq;
};

static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
    struct skcipher_givcrypt_request *req)
{
    return crypto_ablkcipher_reqtfm(&req->creq);
}

static inline int crypto_skcipher_givencrypt(
    struct skcipher_givcrypt_request *req)
{
    struct ablkcipher_tfm *crt =
        crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
    return crt->givencrypt(req);
};

static inline int crypto_skcipher_givdecrypt(
    struct skcipher_givcrypt_request *req)
{
    struct ablkcipher_tfm *crt =
        crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
    return crt->givdecrypt(req);
};

static inline void skcipher_givcrypt_set_tfm(
    struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm)
{
    req->creq.base.tfm = crypto_ablkcipher_tfm(tfm);
}

static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast(
    struct crypto_async_request *req)
{
    return container_of(ablkcipher_request_cast(req),
                struct skcipher_givcrypt_request, creq);
}

static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc(
    struct crypto_ablkcipher *tfm, gfp_t gfp)
{
    struct skcipher_givcrypt_request *req;

    req = kmalloc(sizeof(struct skcipher_givcrypt_request) +
              crypto_ablkcipher_reqsize(tfm), gfp);

    if (likely(req))
        skcipher_givcrypt_set_tfm(req, tfm);

    return req;
}

static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req)
{
    kfree(req);
}

static inline void skcipher_givcrypt_set_callback(
    struct skcipher_givcrypt_request *req, u32 flags,
    crypto_completion_t complete, void *data)
{
    ablkcipher_request_set_callback(&req->creq, flags, complete, data);
}

static inline void skcipher_givcrypt_set_crypt(
    struct skcipher_givcrypt_request *req,
    struct scatterlist *src, struct scatterlist *dst,
    unsigned int nbytes, void *iv)
{
    ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv);
}

static inline void skcipher_givcrypt_set_giv(
    struct skcipher_givcrypt_request *req, u8 *giv, u64 seq)
{
    req->giv = giv;
    req->seq = seq;
}

#endif  /* _CRYPTO_SKCIPHER_H */