include/crypto/aead.h

   1 /*
   2  * AEAD: Authenticated Encryption with Associated Data
   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_AEAD_H
  14 #define _CRYPTO_AEAD_H
  15
  16 #include <linux/crypto.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19
  20 /**
  21  *      struct aead_givcrypt_request - AEAD request with IV generation
  22  *      @seq: Sequence number for IV generation
  23  *      @giv: Space for generated IV
  24  *      @areq: The AEAD request itself
  25  */
  26 struct aead_givcrypt_request {
  27         u64 seq;
  28         u8 *giv;
  29
  30         struct aead_request areq;
  31 };
  32
  33 static inline struct crypto_aead *aead_givcrypt_reqtfm(
  34         struct aead_givcrypt_request *req)
  35 {
  36         return crypto_aead_reqtfm(&req->areq);
  37 }
  38
  39 static inline int crypto_aead_givencrypt(struct aead_givcrypt_request *req)
  40 {
  41         struct aead_tfm *crt = crypto_aead_crt(aead_givcrypt_reqtfm(req));
  42         return crt->givencrypt(req);
  43 };
  44
  45 static inline int crypto_aead_givdecrypt(struct aead_givcrypt_request *req)
  46 {
  47         struct aead_tfm *crt = crypto_aead_crt(aead_givcrypt_reqtfm(req));
  48         return crt->givdecrypt(req);
  49 };
  50
  51 static inline void aead_givcrypt_set_tfm(struct aead_givcrypt_request *req,
  52                                          struct crypto_aead *tfm)
  53 {
  54         req->areq.base.tfm = crypto_aead_tfm(tfm);
  55 }
  56
  57 static inline struct aead_givcrypt_request *aead_givcrypt_alloc(
  58         struct crypto_aead *tfm, gfp_t gfp)
  59 {
  60         struct aead_givcrypt_request *req;
  61
  62         req = kmalloc(sizeof(struct aead_givcrypt_request) +
  63                       crypto_aead_reqsize(tfm), gfp);
  64
  65         if (likely(req))
  66                 aead_givcrypt_set_tfm(req, tfm);
  67
  68         return req;
  69 }
  70
  71 static inline void aead_givcrypt_free(struct aead_givcrypt_request *req)
  72 {
  73         kfree(req);
  74 }
  75
  76 static inline void aead_givcrypt_set_callback(
  77         struct aead_givcrypt_request *req, u32 flags,
  78         crypto_completion_t complete, void *data)
  79 {
  80         aead_request_set_callback(&req->areq, flags, complete, data);
  81 }
  82
  83 static inline void aead_givcrypt_set_crypt(struct aead_givcrypt_request *req,
  84                                            struct scatterlist *src,
  85                                            struct scatterlist *dst,
  86                                            unsigned int nbytes, void *iv)
  87 {
  88         aead_request_set_crypt(&req->areq, src, dst, nbytes, iv);
  89 }
  90
  91 static inline void aead_givcrypt_set_assoc(struct aead_givcrypt_request *req,
  92                                            struct scatterlist *assoc,
  93                                            unsigned int assoclen)
  94 {
  95         aead_request_set_assoc(&req->areq, assoc, assoclen);
  96 }
  97
  98 static inline void aead_givcrypt_set_giv(struct aead_givcrypt_request *req,
  99                                          u8 *giv, u64 seq)
 100 {
 101         req->giv = giv;
 102         req->seq = seq;
 103 }
 104
 105 #endif  /* _CRYPTO_AEAD_H */