d56bb71617c315e5cf13505f1ddc32c0cf698377
[linux-2.6.git] / include / crypto / hash.h
1 /*
2  * Hash: Hash algorithms under the crypto API
3  * 
4  * Copyright (c) 2008 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_HASH_H
14 #define _CRYPTO_HASH_H
15
16 #include <linux/crypto.h>
17
18 struct shash_desc {
19         struct crypto_shash *tfm;
20         u32 flags;
21
22         void *__ctx[] CRYPTO_MINALIGN_ATTR;
23 };
24
25 struct shash_alg {
26         int (*init)(struct shash_desc *desc);
27         int (*reinit)(struct shash_desc *desc);
28         int (*update)(struct shash_desc *desc, const u8 *data,
29                       unsigned int len);
30         int (*final)(struct shash_desc *desc, u8 *out);
31         int (*finup)(struct shash_desc *desc, const u8 *data,
32                      unsigned int len, u8 *out);
33         int (*digest)(struct shash_desc *desc, const u8 *data,
34                       unsigned int len, u8 *out);
35         int (*setkey)(struct crypto_shash *tfm, const u8 *key,
36                       unsigned int keylen);
37
38         unsigned int descsize;
39         unsigned int digestsize;
40
41         struct crypto_alg base;
42 };
43
44 struct crypto_ahash {
45         struct crypto_tfm base;
46 };
47
48 struct crypto_shash {
49         struct crypto_tfm base;
50 };
51
52 static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
53 {
54         return (struct crypto_ahash *)tfm;
55 }
56
57 static inline struct crypto_ahash *crypto_alloc_ahash(const char *alg_name,
58                                                       u32 type, u32 mask)
59 {
60         type &= ~CRYPTO_ALG_TYPE_MASK;
61         mask &= ~CRYPTO_ALG_TYPE_MASK;
62         type |= CRYPTO_ALG_TYPE_AHASH;
63         mask |= CRYPTO_ALG_TYPE_AHASH_MASK;
64
65         return __crypto_ahash_cast(crypto_alloc_base(alg_name, type, mask));
66 }
67
68 static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
69 {
70         return &tfm->base;
71 }
72
73 static inline void crypto_free_ahash(struct crypto_ahash *tfm)
74 {
75         crypto_free_tfm(crypto_ahash_tfm(tfm));
76 }
77
78 static inline unsigned int crypto_ahash_alignmask(
79         struct crypto_ahash *tfm)
80 {
81         return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
82 }
83
84 static inline struct ahash_tfm *crypto_ahash_crt(struct crypto_ahash *tfm)
85 {
86         return &crypto_ahash_tfm(tfm)->crt_ahash;
87 }
88
89 static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
90 {
91         return crypto_ahash_crt(tfm)->digestsize;
92 }
93
94 static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
95 {
96         return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
97 }
98
99 static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
100 {
101         crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
102 }
103
104 static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
105 {
106         crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
107 }
108
109 static inline struct crypto_ahash *crypto_ahash_reqtfm(
110         struct ahash_request *req)
111 {
112         return __crypto_ahash_cast(req->base.tfm);
113 }
114
115 static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
116 {
117         return crypto_ahash_crt(tfm)->reqsize;
118 }
119
120 static inline void *ahash_request_ctx(struct ahash_request *req)
121 {
122         return req->__ctx;
123 }
124
125 static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
126                                       const u8 *key, unsigned int keylen)
127 {
128         struct ahash_tfm *crt = crypto_ahash_crt(tfm);
129
130         return crt->setkey(tfm, key, keylen);
131 }
132
133 static inline int crypto_ahash_digest(struct ahash_request *req)
134 {
135         struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
136         return crt->digest(req);
137 }
138
139 static inline void crypto_ahash_export(struct ahash_request *req, u8 *out)
140 {
141         memcpy(out, ahash_request_ctx(req),
142                crypto_ahash_reqsize(crypto_ahash_reqtfm(req)));
143 }
144
145 int crypto_ahash_import(struct ahash_request *req, const u8 *in);
146
147 static inline int crypto_ahash_init(struct ahash_request *req)
148 {
149         struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
150         return crt->init(req);
151 }
152
153 static inline int crypto_ahash_update(struct ahash_request *req)
154 {
155         struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
156         return crt->update(req);
157 }
158
159 static inline int crypto_ahash_final(struct ahash_request *req)
160 {
161         struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
162         return crt->final(req);
163 }
164
165 static inline void ahash_request_set_tfm(struct ahash_request *req,
166                                          struct crypto_ahash *tfm)
167 {
168         req->base.tfm = crypto_ahash_tfm(tfm);
169 }
170
171 static inline struct ahash_request *ahash_request_alloc(
172         struct crypto_ahash *tfm, gfp_t gfp)
173 {
174         struct ahash_request *req;
175
176         req = kmalloc(sizeof(struct ahash_request) +
177                       crypto_ahash_reqsize(tfm), gfp);
178
179         if (likely(req))
180                 ahash_request_set_tfm(req, tfm);
181
182         return req;
183 }
184
185 static inline void ahash_request_free(struct ahash_request *req)
186 {
187         kfree(req);
188 }
189
190 static inline struct ahash_request *ahash_request_cast(
191         struct crypto_async_request *req)
192 {
193         return container_of(req, struct ahash_request, base);
194 }
195
196 static inline void ahash_request_set_callback(struct ahash_request *req,
197                                               u32 flags,
198                                               crypto_completion_t complete,
199                                               void *data)
200 {
201         req->base.complete = complete;
202         req->base.data = data;
203         req->base.flags = flags;
204 }
205
206 static inline void ahash_request_set_crypt(struct ahash_request *req,
207                                            struct scatterlist *src, u8 *result,
208                                            unsigned int nbytes)
209 {
210         req->src = src;
211         req->nbytes = nbytes;
212         req->result = result;
213 }
214
215 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
216                                         u32 mask);
217
218 static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
219 {
220         return &tfm->base;
221 }
222
223 static inline void crypto_free_shash(struct crypto_shash *tfm)
224 {
225         crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm));
226 }
227
228 static inline unsigned int crypto_shash_alignmask(
229         struct crypto_shash *tfm)
230 {
231         return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm));
232 }
233
234 static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm)
235 {
236         return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm));
237 }
238
239 static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
240 {
241         return container_of(alg, struct shash_alg, base);
242 }
243
244 static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
245 {
246         return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
247 }
248
249 static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
250 {
251         return crypto_shash_alg(tfm)->digestsize;
252 }
253
254 static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
255 {
256         return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
257 }
258
259 static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
260 {
261         crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
262 }
263
264 static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
265 {
266         crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
267 }
268
269 static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
270 {
271         return crypto_shash_alg(tfm)->descsize;
272 }
273
274 static inline void *shash_desc_ctx(struct shash_desc *desc)
275 {
276         return desc->__ctx;
277 }
278
279 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
280                         unsigned int keylen);
281 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
282                         unsigned int len, u8 *out);
283
284 static inline void crypto_shash_export(struct shash_desc *desc, u8 *out)
285 {
286         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
287 }
288
289 int crypto_shash_import(struct shash_desc *desc, const u8 *in);
290
291 static inline int crypto_shash_init(struct shash_desc *desc)
292 {
293         return crypto_shash_alg(desc->tfm)->init(desc);
294 }
295
296 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
297                         unsigned int len);
298 int crypto_shash_final(struct shash_desc *desc, u8 *out);
299 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
300                        unsigned int len, u8 *out);
301
302 #endif  /* _CRYPTO_HASH_H */