linux - include/crypto/algapi.h

174 lines · 4.2 KiB

1	/*
2	* Cryptographic API for algorithms (i.e., low-level API).
3	*
4	* Copyright (c) 2006 Herbert Xu <[email protected]>
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	#ifndef _CRYPTO_ALGAPI_H
13	#define _CRYPTO_ALGAPI_H
14
15	#include <linux/crypto.h>
16
17	struct module;
18	struct seq_file;
19
20	struct crypto_type {
21	unsigned int (ctxsize)(struct crypto_alg alg, u32 type, u32 mask);
22	int (init)(struct crypto_tfm tfm, u32 type, u32 mask);
23	void (exit)(struct crypto_tfm tfm);
24	void (show)(struct seq_file m, struct crypto_alg *alg);
25	};
26
27	struct crypto_instance {
28	struct crypto_alg alg;
29
30	struct crypto_template *tmpl;
31	struct hlist_node list;
32
33	void *__ctx[] CRYPTO_MINALIGN_ATTR;
34	};
35
36	struct crypto_template {
37	struct list_head list;
38	struct hlist_head instances;
39	struct module *module;
40
41	struct crypto_instance (alloc)(void *param, unsigned int len);
42	void (free)(struct crypto_instance inst);
43
44	char name[CRYPTO_MAX_ALG_NAME];
45	};
46
47	struct crypto_spawn {
48	struct list_head list;
49	struct crypto_alg *alg;
50	struct crypto_instance *inst;
51	};
52
53	struct scatter_walk {
54	struct scatterlist *sg;
55	unsigned int offset;
56	};
57
58	struct blkcipher_walk {
59	union {
60	struct {
61	struct page *page;
62	unsigned long offset;
63	} phys;
64
65	struct {
66	u8 *page;
67	u8 *addr;
68	} virt;
69	} src, dst;
70
71	struct scatter_walk in;
72	unsigned int nbytes;
73
74	struct scatter_walk out;
75	unsigned int total;
76
77	void *page;
78	u8 *buffer;
79	u8 *iv;
80
81	int flags;
82	};
83
84	extern const struct crypto_type crypto_blkcipher_type;
85	extern const struct crypto_type crypto_hash_type;
86
87	void crypto_mod_put(struct crypto_alg *alg);
88
89	int crypto_register_template(struct crypto_template *tmpl);
90	void crypto_unregister_template(struct crypto_template *tmpl);
91	struct crypto_template crypto_lookup_template(const char name);
92
93	int crypto_init_spawn(struct crypto_spawn spawn, struct crypto_alg alg,
94	struct crypto_instance *inst);
95	void crypto_drop_spawn(struct crypto_spawn *spawn);
96	struct crypto_tfm crypto_spawn_tfm(struct crypto_spawn spawn, u32 type,
97	u32 mask);
98
99	struct crypto_alg crypto_get_attr_alg(void param, unsigned int len,
100	u32 type, u32 mask);
101	struct crypto_instance crypto_alloc_instance(const char name,
102	struct crypto_alg *alg);
103
104	int blkcipher_walk_done(struct blkcipher_desc *desc,
105	struct blkcipher_walk *walk, int err);
106	int blkcipher_walk_virt(struct blkcipher_desc *desc,
107	struct blkcipher_walk *walk);
108	int blkcipher_walk_phys(struct blkcipher_desc *desc,
109	struct blkcipher_walk *walk);
110
111	static inline void crypto_tfm_ctx_aligned(struct crypto_tfm tfm)
112	{
113	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
114	unsigned long align = crypto_tfm_alg_alignmask(tfm);
115
116	if (align <= crypto_tfm_ctx_alignment())
117	align = 1;
118	return (void *)ALIGN(addr, align);
119	}
120
121	static inline void crypto_instance_ctx(struct crypto_instance inst)
122	{
123	return inst->__ctx;
124	}
125
126	static inline void crypto_blkcipher_ctx(struct crypto_blkcipher tfm)
127	{
128	return crypto_tfm_ctx(&tfm->base);
129	}
130
131	static inline void crypto_blkcipher_ctx_aligned(struct crypto_blkcipher tfm)
132	{
133	return crypto_tfm_ctx_aligned(&tfm->base);
134	}
135
136	static inline struct crypto_cipher *crypto_spawn_cipher(
137	struct crypto_spawn *spawn)
138	{
139	u32 type = CRYPTO_ALG_TYPE_CIPHER;
140	u32 mask = CRYPTO_ALG_TYPE_MASK;
141
142	return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
143	}
144
145	static inline struct cipher_alg crypto_cipher_alg(struct crypto_cipher tfm)
146	{
147	return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
148	}
149
150	static inline struct crypto_hash crypto_spawn_hash(struct crypto_spawn spawn)
151	{
152	u32 type = CRYPTO_ALG_TYPE_HASH;
153	u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
154
155	return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
156	}
157
158	static inline void crypto_hash_ctx_aligned(struct crypto_hash tfm)
159	{
160	return crypto_tfm_ctx_aligned(&tfm->base);
161	}
162
163	static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
164	struct scatterlist *dst,
165	struct scatterlist *src,
166	unsigned int nbytes)
167	{
168	walk->in.sg = src;
169	walk->out.sg = dst;
170	walk->total = nbytes;
171	}
172
173	#endif /* _CRYPTO_ALGAPI_H */
174