include/crypto/skcipher.h

   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  */
  26 struct skcipher_givcrypt_request {
  27         u64 seq;
  28         u8 *giv;
  29
  30         struct ablkcipher_request creq;
  31 };
  32
  33 static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
  34         struct skcipher_givcrypt_request *req)
  35 {
  36         return crypto_ablkcipher_reqtfm(&req->creq);
  37 }
  38
  39 static 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
  47 static 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
  55 static 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
  61 static 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
  68 static 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
  82 static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req)
  83 {
  84         kfree(req);
  85 }
  86
  87 static inline void skcipher_givcrypt_set_callback(
  88         struct skcipher_givcrypt_request *req, u32 flags,
  89         crypto_completion_t compl, void *data)
  90 {
  91         ablkcipher_request_set_callback(&req->creq, flags, compl, data);
  92 }
  93
  94 static 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
 102 static 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