]>
Commit | Line | Data |
---|---|---|
3c339ab8 TS |
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 | |
22287b0b TS |
21 | * @src: Source data |
22 | * @dst: Destination data | |
23 | * @src_len: Size of the input buffer | |
e14a1f1e | 24 | * @dst_len: Size of the output buffer. It needs to be at least |
3c339ab8 | 25 | * as big as the expected result depending on the operation |
e14a1f1e | 26 | * After operation it will be updated with the actual size of the |
22287b0b TS |
27 | * result. |
28 | * In case of error where the dst sgl size was insufficient, | |
3c339ab8 TS |
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; | |
22287b0b TS |
34 | struct scatterlist *src; |
35 | struct scatterlist *dst; | |
3c339ab8 TS |
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 | |
e14a1f1e | 62 | * @encrypt: Function performs an encrypt operation as defined by public key |
3c339ab8 TS |
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 | |
22287b0b TS |
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 | |
e14a1f1e | 76 | * @max_size: Function returns dest buffer size required for a given key. |
3c339ab8 TS |
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); | |
22287b0b TS |
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); | |
3c339ab8 TS |
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 | * @cmlp: 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 | /** | |
e14a1f1e | 235 | * akcipher_request_set_crypt() -- Sets request parameters |
3c339ab8 TS |
236 | * |
237 | * Sets parameters required by crypto operation | |
238 | * | |
239 | * @req: public key request | |
22287b0b TS |
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 | |
3c339ab8 TS |
244 | */ |
245 | static inline void akcipher_request_set_crypt(struct akcipher_request *req, | |
22287b0b TS |
246 | struct scatterlist *src, |
247 | struct scatterlist *dst, | |
3c339ab8 TS |
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 | ||
22287b0b TS |
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 | ||
3c339ab8 TS |
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 | /** | |
22287b0b TS |
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 | |
3c339ab8 TS |
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 | |
22287b0b | 373 | * @key: BER encoded private key |
3c339ab8 TS |
374 | * @keylen: length of the key |
375 | * | |
376 | * Return: zero on success; error code in case of error | |
377 | */ | |
22287b0b TS |
378 | static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm, |
379 | const void *key, | |
380 | unsigned int keylen) | |
3c339ab8 TS |
381 | { |
382 | struct akcipher_alg *alg = crypto_akcipher_alg(tfm); | |
383 | ||
22287b0b | 384 | return alg->set_priv_key(tfm, key, keylen); |
3c339ab8 TS |
385 | } |
386 | #endif |