linux/include/crypto/skcipher.h
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   1/*
   2 * Symmetric key ciphers.
   3 * 
   4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the Free
   8 * Software Foundation; either version 2 of the License, or (at your option) 
   9 * any later version.
  10 *
  11 */
  12
  13#ifndef _CRYPTO_SKCIPHER_H
  14#define _CRYPTO_SKCIPHER_H
  15
  16#include <linux/crypto.h>
  17#include <linux/kernel.h>
  18#include <linux/slab.h>
  19
  20/**
  21 *      struct skcipher_givcrypt_request - Crypto request with IV generation
  22 *      @seq: Sequence number for IV generation
  23 *      @giv: Space for generated IV
  24 *      @creq: The crypto request itself
  25 */
  26struct skcipher_givcrypt_request {
  27        u64 seq;
  28        u8 *giv;
  29
  30        struct ablkcipher_request creq;
  31};
  32
  33static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
  34        struct skcipher_givcrypt_request *req)
  35{
  36        return crypto_ablkcipher_reqtfm(&req->creq);
  37}
  38
  39static inline int crypto_skcipher_givencrypt(
  40        struct skcipher_givcrypt_request *req)
  41{
  42        struct ablkcipher_tfm *crt =
  43                crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
  44        return crt->givencrypt(req);
  45};
  46
  47static inline int crypto_skcipher_givdecrypt(
  48        struct skcipher_givcrypt_request *req)
  49{
  50        struct ablkcipher_tfm *crt =
  51                crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
  52        return crt->givdecrypt(req);
  53};
  54
  55static inline void skcipher_givcrypt_set_tfm(
  56        struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm)
  57{
  58        req->creq.base.tfm = crypto_ablkcipher_tfm(tfm);
  59}
  60
  61static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast(
  62        struct crypto_async_request *req)
  63{
  64        return container_of(ablkcipher_request_cast(req),
  65                            struct skcipher_givcrypt_request, creq);
  66}
  67
  68static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc(
  69        struct crypto_ablkcipher *tfm, gfp_t gfp)
  70{
  71        struct skcipher_givcrypt_request *req;
  72
  73        req = kmalloc(sizeof(struct skcipher_givcrypt_request) +
  74                      crypto_ablkcipher_reqsize(tfm), gfp);
  75
  76        if (likely(req))
  77                skcipher_givcrypt_set_tfm(req, tfm);
  78
  79        return req;
  80}
  81
  82static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req)
  83{
  84        kfree(req);
  85}
  86
  87static inline void skcipher_givcrypt_set_callback(
  88        struct skcipher_givcrypt_request *req, u32 flags,
  89        crypto_completion_t complete, void *data)
  90{
  91        ablkcipher_request_set_callback(&req->creq, flags, complete, data);
  92}
  93
  94static inline void skcipher_givcrypt_set_crypt(
  95        struct skcipher_givcrypt_request *req,
  96        struct scatterlist *src, struct scatterlist *dst,
  97        unsigned int nbytes, void *iv)
  98{
  99        ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv);
 100}
 101
 102static inline void skcipher_givcrypt_set_giv(
 103        struct skcipher_givcrypt_request *req, u8 *giv, u64 seq)
 104{
 105        req->giv = giv;
 106        req->seq = seq;
 107}
 108
 109#endif  /* _CRYPTO_SKCIPHER_H */
 110
 111
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