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TOMOYO Linux Cross Reference
Linux/include/crypto/akcipher.h

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  1 /*
  2  * Public Key Encryption
  3  *
  4  * Copyright (c) 2015, Intel Corporation
  5  * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License as published by the Free
  9  * Software Foundation; either version 2 of the License, or (at your option)
 10  * any later version.
 11  *
 12  */
 13 #ifndef _CRYPTO_AKCIPHER_H
 14 #define _CRYPTO_AKCIPHER_H
 15 #include <linux/crypto.h>
 16 
 17 /**
 18  * struct akcipher_request - public key request
 19  *
 20  * @base:       Common attributes for async crypto requests
 21  * @src:        Source data
 22  * @dst:        Destination data
 23  * @src_len:    Size of the input buffer
 24  * @dst_len:    Size of the output buffer. It needs to be at least
 25  *              as big as the expected result depending on the operation
 26  *              After operation it will be updated with the actual size of the
 27  *              result.
 28  *              In case of error where the dst sgl size was insufficient,
 29  *              it will be updated to the size required for the operation.
 30  * @__ctx:      Start of private context data
 31  */
 32 struct akcipher_request {
 33         struct crypto_async_request base;
 34         struct scatterlist *src;
 35         struct scatterlist *dst;
 36         unsigned int src_len;
 37         unsigned int dst_len;
 38         void *__ctx[] CRYPTO_MINALIGN_ATTR;
 39 };
 40 
 41 /**
 42  * struct crypto_akcipher - user-instantiated objects which encapsulate
 43  * algorithms and core processing logic
 44  *
 45  * @base:       Common crypto API algorithm data structure
 46  */
 47 struct crypto_akcipher {
 48         struct crypto_tfm base;
 49 };
 50 
 51 /**
 52  * struct akcipher_alg - generic public key algorithm
 53  *
 54  * @sign:       Function performs a sign operation as defined by public key
 55  *              algorithm. In case of error, where the dst_len was insufficient,
 56  *              the req->dst_len will be updated to the size required for the
 57  *              operation
 58  * @verify:     Function performs a sign operation as defined by public key
 59  *              algorithm. In case of error, where the dst_len was insufficient,
 60  *              the req->dst_len will be updated to the size required for the
 61  *              operation
 62  * @encrypt:    Function performs an encrypt operation as defined by public key
 63  *              algorithm. In case of error, where the dst_len was insufficient,
 64  *              the req->dst_len will be updated to the size required for the
 65  *              operation
 66  * @decrypt:    Function performs a decrypt operation as defined by public key
 67  *              algorithm. In case of error, where the dst_len was insufficient,
 68  *              the req->dst_len will be updated to the size required for the
 69  *              operation
 70  * @set_pub_key: Function invokes the algorithm specific set public key
 71  *              function, which knows how to decode and interpret
 72  *              the BER encoded public key
 73  * @set_priv_key: Function invokes the algorithm specific set private key
 74  *              function, which knows how to decode and interpret
 75  *              the BER encoded private key
 76  * @max_size:   Function returns dest buffer size required for a given key.
 77  * @init:       Initialize the cryptographic transformation object.
 78  *              This function is used to initialize the cryptographic
 79  *              transformation object. This function is called only once at
 80  *              the instantiation time, right after the transformation context
 81  *              was allocated. In case the cryptographic hardware has some
 82  *              special requirements which need to be handled by software, this
 83  *              function shall check for the precise requirement of the
 84  *              transformation and put any software fallbacks in place.
 85  * @exit:       Deinitialize the cryptographic transformation object. This is a
 86  *              counterpart to @init, used to remove various changes set in
 87  *              @init.
 88  *
 89  * @reqsize:    Request context size required by algorithm implementation
 90  * @base:       Common crypto API algorithm data structure
 91  */
 92 struct akcipher_alg {
 93         int (*sign)(struct akcipher_request *req);
 94         int (*verify)(struct akcipher_request *req);
 95         int (*encrypt)(struct akcipher_request *req);
 96         int (*decrypt)(struct akcipher_request *req);
 97         int (*set_pub_key)(struct crypto_akcipher *tfm, const void *key,
 98                            unsigned int keylen);
 99         int (*set_priv_key)(struct crypto_akcipher *tfm, const void *key,
100                             unsigned int keylen);
101         int (*max_size)(struct crypto_akcipher *tfm);
102         int (*init)(struct crypto_akcipher *tfm);
103         void (*exit)(struct crypto_akcipher *tfm);
104 
105         unsigned int reqsize;
106         struct crypto_alg base;
107 };
108 
109 /**
110  * DOC: Generic Public Key API
111  *
112  * The Public Key API is used with the algorithms of type
113  * CRYPTO_ALG_TYPE_AKCIPHER (listed as type "akcipher" in /proc/crypto)
114  */
115 
116 /**
117  * crypto_alloc_akcipher() - allocate AKCIPHER tfm handle
118  * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
119  *            public key algorithm e.g. "rsa"
120  * @type: specifies the type of the algorithm
121  * @mask: specifies the mask for the algorithm
122  *
123  * Allocate a handle for public key algorithm. The returned struct
124  * crypto_akcipher is the handle that is required for any subsequent
125  * API invocation for the public key operations.
126  *
127  * Return: allocated handle in case of success; IS_ERR() is true in case
128  *         of an error, PTR_ERR() returns the error code.
129  */
130 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
131                                               u32 mask);
132 
133 static inline struct crypto_tfm *crypto_akcipher_tfm(
134         struct crypto_akcipher *tfm)
135 {
136         return &tfm->base;
137 }
138 
139 static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg)
140 {
141         return container_of(alg, struct akcipher_alg, base);
142 }
143 
144 static inline struct crypto_akcipher *__crypto_akcipher_tfm(
145         struct crypto_tfm *tfm)
146 {
147         return container_of(tfm, struct crypto_akcipher, base);
148 }
149 
150 static inline struct akcipher_alg *crypto_akcipher_alg(
151         struct crypto_akcipher *tfm)
152 {
153         return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg);
154 }
155 
156 static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
157 {
158         return crypto_akcipher_alg(tfm)->reqsize;
159 }
160 
161 static inline void akcipher_request_set_tfm(struct akcipher_request *req,
162                                             struct crypto_akcipher *tfm)
163 {
164         req->base.tfm = crypto_akcipher_tfm(tfm);
165 }
166 
167 static inline struct crypto_akcipher *crypto_akcipher_reqtfm(
168         struct akcipher_request *req)
169 {
170         return __crypto_akcipher_tfm(req->base.tfm);
171 }
172 
173 /**
174  * crypto_free_akcipher() - free AKCIPHER tfm handle
175  *
176  * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
177  */
178 static inline void crypto_free_akcipher(struct crypto_akcipher *tfm)
179 {
180         crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm));
181 }
182 
183 /**
184  * akcipher_request_alloc() - allocates public key request
185  *
186  * @tfm:        AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
187  * @gfp:        allocation flags
188  *
189  * Return: allocated handle in case of success or NULL in case of an error.
190  */
191 static inline struct akcipher_request *akcipher_request_alloc(
192         struct crypto_akcipher *tfm, gfp_t gfp)
193 {
194         struct akcipher_request *req;
195 
196         req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
197         if (likely(req))
198                 akcipher_request_set_tfm(req, tfm);
199 
200         return req;
201 }
202 
203 /**
204  * akcipher_request_free() - zeroize and free public key request
205  *
206  * @req:        request to free
207  */
208 static inline void akcipher_request_free(struct akcipher_request *req)
209 {
210         kzfree(req);
211 }
212 
213 /**
214  * akcipher_request_set_callback() - Sets an asynchronous callback.
215  *
216  * Callback will be called when an asynchronous operation on a given
217  * request is finished.
218  *
219  * @req:        request that the callback will be set for
220  * @flgs:       specify for instance if the operation may backlog
221  * @cmpl:       callback which will be called
222  * @data:       private data used by the caller
223  */
224 static inline void akcipher_request_set_callback(struct akcipher_request *req,
225                                                  u32 flgs,
226                                                  crypto_completion_t cmpl,
227                                                  void *data)
228 {
229         req->base.complete = cmpl;
230         req->base.data = data;
231         req->base.flags = flgs;
232 }
233 
234 /**
235  * akcipher_request_set_crypt() - Sets request parameters
236  *
237  * Sets parameters required by crypto operation
238  *
239  * @req:        public key request
240  * @src:        ptr to input scatter list
241  * @dst:        ptr to output scatter list
242  * @src_len:    size of the src input scatter list to be processed
243  * @dst_len:    size of the dst output scatter list
244  */
245 static inline void akcipher_request_set_crypt(struct akcipher_request *req,
246                                               struct scatterlist *src,
247                                               struct scatterlist *dst,
248                                               unsigned int src_len,
249                                               unsigned int dst_len)
250 {
251         req->src = src;
252         req->dst = dst;
253         req->src_len = src_len;
254         req->dst_len = dst_len;
255 }
256 
257 /**
258  * crypto_akcipher_maxsize() - Get len for output buffer
259  *
260  * Function returns the dest buffer size required for a given key
261  *
262  * @tfm:        AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
263  *
264  * Return: minimum len for output buffer or error code in key hasn't been set
265  */
266 static inline int crypto_akcipher_maxsize(struct crypto_akcipher *tfm)
267 {
268         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
269 
270         return alg->max_size(tfm);
271 }
272 
273 /**
274  * crypto_akcipher_encrypt() - Invoke public key encrypt operation
275  *
276  * Function invokes the specific public key encrypt operation for a given
277  * public key algorithm
278  *
279  * @req:        asymmetric key request
280  *
281  * Return: zero on success; error code in case of error
282  */
283 static inline int crypto_akcipher_encrypt(struct akcipher_request *req)
284 {
285         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
286         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
287 
288         return alg->encrypt(req);
289 }
290 
291 /**
292  * crypto_akcipher_decrypt() - Invoke public key decrypt operation
293  *
294  * Function invokes the specific public key decrypt operation for a given
295  * public key algorithm
296  *
297  * @req:        asymmetric key request
298  *
299  * Return: zero on success; error code in case of error
300  */
301 static inline int crypto_akcipher_decrypt(struct akcipher_request *req)
302 {
303         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
304         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
305 
306         return alg->decrypt(req);
307 }
308 
309 /**
310  * crypto_akcipher_sign() - Invoke public key sign operation
311  *
312  * Function invokes the specific public key sign operation for a given
313  * public key algorithm
314  *
315  * @req:        asymmetric key request
316  *
317  * Return: zero on success; error code in case of error
318  */
319 static inline int crypto_akcipher_sign(struct akcipher_request *req)
320 {
321         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
322         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
323 
324         return alg->sign(req);
325 }
326 
327 /**
328  * crypto_akcipher_verify() - Invoke public key verify operation
329  *
330  * Function invokes the specific public key verify operation for a given
331  * public key algorithm
332  *
333  * @req:        asymmetric key request
334  *
335  * Return: zero on success; error code in case of error
336  */
337 static inline int crypto_akcipher_verify(struct akcipher_request *req)
338 {
339         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
340         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
341 
342         return alg->verify(req);
343 }
344 
345 /**
346  * crypto_akcipher_set_pub_key() - Invoke set public key operation
347  *
348  * Function invokes the algorithm specific set key function, which knows
349  * how to decode and interpret the encoded key
350  *
351  * @tfm:        tfm handle
352  * @key:        BER encoded public key
353  * @keylen:     length of the key
354  *
355  * Return: zero on success; error code in case of error
356  */
357 static inline int crypto_akcipher_set_pub_key(struct crypto_akcipher *tfm,
358                                               const void *key,
359                                               unsigned int keylen)
360 {
361         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
362 
363         return alg->set_pub_key(tfm, key, keylen);
364 }
365 
366 /**
367  * crypto_akcipher_set_priv_key() - Invoke set private key operation
368  *
369  * Function invokes the algorithm specific set key function, which knows
370  * how to decode and interpret the encoded key
371  *
372  * @tfm:        tfm handle
373  * @key:        BER encoded private key
374  * @keylen:     length of the key
375  *
376  * Return: zero on success; error code in case of error
377  */
378 static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
379                                                const void *key,
380                                                unsigned int keylen)
381 {
382         struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
383 
384         return alg->set_priv_key(tfm, key, keylen);
385 }
386 #endif
387 

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