xref: /linux/include/crypto/internal/aead.h (revision acbf6de674ef7b1b5870b25e7b3c695bf84273d0) 
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * AEAD: Authenticated Encryption with Associated Data
4  *
5  * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
6  */
7 
8 #ifndef _CRYPTO_INTERNAL_AEAD_H
9 #define _CRYPTO_INTERNAL_AEAD_H
10 
11 #include <crypto/aead.h>
12 #include <crypto/algapi.h>
13 #include <linux/stddef.h>
14 #include <linux/types.h>
15 
16 struct rtattr;
17 
18 struct aead_instance {
19 	void (*free)(struct aead_instance *inst);
20 	union {
21 		struct {
22 			char head[offsetof(struct aead_alg, base)];
23 			struct crypto_instance base;
24 		} s;
25 		struct aead_alg alg;
26 	};
27 };
28 
29 struct crypto_aead_spawn {
30 	struct crypto_spawn base;
31 };
32 
33 struct aead_queue {
34 	struct crypto_queue base;
35 };
36 
37 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
38 {
39 	return crypto_tfm_ctx(&tfm->base);
40 }
41 
42 static inline void *crypto_aead_ctx_dma(struct crypto_aead *tfm)
43 {
44 	return crypto_tfm_ctx_dma(&tfm->base);
45 }
46 
47 static inline struct crypto_instance *aead_crypto_instance(
48 	struct aead_instance *inst)
49 {
50 	return container_of(&inst->alg.base, struct crypto_instance, alg);
51 }
52 
53 static inline struct aead_instance *aead_instance(struct crypto_instance *inst)
54 {
55 	return container_of(&inst->alg, struct aead_instance, alg.base);
56 }
57 
58 static inline struct aead_instance *aead_alg_instance(struct crypto_aead *aead)
59 {
60 	return aead_instance(crypto_tfm_alg_instance(&aead->base));
61 }
62 
63 static inline void *aead_instance_ctx(struct aead_instance *inst)
64 {
65 	return crypto_instance_ctx(aead_crypto_instance(inst));
66 }
67 
68 static inline void *aead_request_ctx(struct aead_request *req)
69 {
70 	return req->__ctx;
71 }
72 
73 static inline void *aead_request_ctx_dma(struct aead_request *req)
74 {
75 	unsigned int align = crypto_dma_align();
76 
77 	if (align <= crypto_tfm_ctx_alignment())
78 		align = 1;
79 
80 	return PTR_ALIGN(aead_request_ctx(req), align);
81 }
82 
83 static inline void aead_request_complete(struct aead_request *req, int err)
84 {
85 	crypto_request_complete(&req->base, err);
86 }
87 
88 static inline u32 aead_request_flags(struct aead_request *req)
89 {
90 	return req->base.flags;
91 }
92 
93 static inline struct aead_request *aead_request_cast(
94 	struct crypto_async_request *req)
95 {
96 	return container_of(req, struct aead_request, base);
97 }
98 
99 int crypto_grab_aead(struct crypto_aead_spawn *spawn,
100 		     struct crypto_instance *inst,
101 		     const char *name, u32 type, u32 mask);
102 
103 static inline void crypto_drop_aead(struct crypto_aead_spawn *spawn)
104 {
105 	crypto_drop_spawn(&spawn->base);
106 }
107 
108 static inline struct aead_alg *crypto_spawn_aead_alg(
109 	struct crypto_aead_spawn *spawn)
110 {
111 	return container_of(spawn->base.alg, struct aead_alg, base);
112 }
113 
114 static inline struct crypto_aead *crypto_spawn_aead(
115 	struct crypto_aead_spawn *spawn)
116 {
117 	return crypto_spawn_tfm2(&spawn->base);
118 }
119 
120 static inline void crypto_aead_set_reqsize(struct crypto_aead *aead,
121 					   unsigned int reqsize)
122 {
123 	aead->reqsize = reqsize;
124 }
125 
126 static inline void crypto_aead_set_reqsize_dma(struct crypto_aead *aead,
127 					       unsigned int reqsize)
128 {
129 	reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1);
130 	aead->reqsize = reqsize;
131 }
132 
133 static inline void aead_init_queue(struct aead_queue *queue,
134 				   unsigned int max_qlen)
135 {
136 	crypto_init_queue(&queue->base, max_qlen);
137 }
138 
139 static inline unsigned int crypto_aead_alg_chunksize(struct aead_alg *alg)
140 {
141 	return alg->chunksize;
142 }
143 
144 /**
145  * crypto_aead_chunksize() - obtain chunk size
146  * @tfm: cipher handle
147  *
148  * The block size is set to one for ciphers such as CCM.  However,
149  * you still need to provide incremental updates in multiples of
150  * the underlying block size as the IV does not have sub-block
151  * granularity.  This is known in this API as the chunk size.
152  *
153  * Return: chunk size in bytes
154  */
155 static inline unsigned int crypto_aead_chunksize(struct crypto_aead *tfm)
156 {
157 	return crypto_aead_alg_chunksize(crypto_aead_alg(tfm));
158 }
159 
160 int crypto_register_aead(struct aead_alg *alg);
161 void crypto_unregister_aead(struct aead_alg *alg);
162 int crypto_register_aeads(struct aead_alg *algs, int count);
163 void crypto_unregister_aeads(struct aead_alg *algs, int count);
164 int aead_register_instance(struct crypto_template *tmpl,
165 			   struct aead_instance *inst);
166 
167 #endif	/* _CRYPTO_INTERNAL_AEAD_H */
168 
169