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 */
106
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