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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Public Key Encryption
4 *
5 * Copyright (c) 2015, Intel Corporation
6 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
7 */
8#ifndef _CRYPTO_AKCIPHER_H
9#define _CRYPTO_AKCIPHER_H
10
11#include <linux/atomic.h>
12#include <linux/crypto.h>
13
14/**
15 * struct akcipher_request - public key request
16 *
17 * @base: Common attributes for async crypto requests
18 * @src: Source data
19 * For verify op this is signature + digest, in that case
20 * total size of @src is @src_len + @dst_len.
21 * @dst: Destination data (Should be NULL for verify op)
22 * @src_len: Size of the input buffer
23 * For verify op it's size of signature part of @src, this part
24 * is supposed to be operated by cipher.
25 * @dst_len: Size of @dst buffer (for all ops except verify).
26 * It needs to be at least as big as the expected result
27 * depending on the operation.
28 * After operation it will be updated with the actual size of the
29 * result.
30 * In case of error where the dst sgl size was insufficient,
31 * it will be updated to the size required for the operation.
32 * For verify op this is size of digest part in @src.
33 * @__ctx: Start of private context data
34 */
35struct akcipher_request {
36 struct crypto_async_request base;
37 struct scatterlist *src;
38 struct scatterlist *dst;
39 unsigned int src_len;
40 unsigned int dst_len;
41 void *__ctx[] CRYPTO_MINALIGN_ATTR;
42};
43
44/**
45 * struct crypto_akcipher - user-instantiated objects which encapsulate
46 * algorithms and core processing logic
47 *
48 * @reqsize: Request context size required by algorithm implementation
49 * @base: Common crypto API algorithm data structure
50 */
51struct crypto_akcipher {
52 unsigned int reqsize;
53
54 struct crypto_tfm base;
55};
56
57/*
58 * struct crypto_istat_akcipher - statistics for akcipher algorithm
59 * @encrypt_cnt: number of encrypt requests
60 * @encrypt_tlen: total data size handled by encrypt requests
61 * @decrypt_cnt: number of decrypt requests
62 * @decrypt_tlen: total data size handled by decrypt requests
63 * @verify_cnt: number of verify operation
64 * @sign_cnt: number of sign requests
65 * @err_cnt: number of error for akcipher requests
66 */
67struct crypto_istat_akcipher {
68 atomic64_t encrypt_cnt;
69 atomic64_t encrypt_tlen;
70 atomic64_t decrypt_cnt;
71 atomic64_t decrypt_tlen;
72 atomic64_t verify_cnt;
73 atomic64_t sign_cnt;
74 atomic64_t err_cnt;
75};
76
77/**
78 * struct akcipher_alg - generic public key algorithm
79 *
80 * @sign: Function performs a sign operation as defined by public key
81 * algorithm. In case of error, where the dst_len was insufficient,
82 * the req->dst_len will be updated to the size required for the
83 * operation
84 * @verify: Function performs a complete verify operation as defined by
85 * public key algorithm, returning verification status. Requires
86 * digest value as input parameter.
87 * @encrypt: Function performs an encrypt operation as defined by public key
88 * algorithm. In case of error, where the dst_len was insufficient,
89 * the req->dst_len will be updated to the size required for the
90 * operation
91 * @decrypt: Function performs a decrypt operation as defined by public key
92 * algorithm. In case of error, where the dst_len was insufficient,
93 * the req->dst_len will be updated to the size required for the
94 * operation
95 * @set_pub_key: Function invokes the algorithm specific set public key
96 * function, which knows how to decode and interpret
97 * the BER encoded public key and parameters
98 * @set_priv_key: Function invokes the algorithm specific set private key
99 * function, which knows how to decode and interpret
100 * the BER encoded private key and parameters
101 * @max_size: Function returns dest buffer size required for a given key.
102 * @init: Initialize the cryptographic transformation object.
103 * This function is used to initialize the cryptographic
104 * transformation object. This function is called only once at
105 * the instantiation time, right after the transformation context
106 * was allocated. In case the cryptographic hardware has some
107 * special requirements which need to be handled by software, this
108 * function shall check for the precise requirement of the
109 * transformation and put any software fallbacks in place.
110 * @exit: Deinitialize the cryptographic transformation object. This is a
111 * counterpart to @init, used to remove various changes set in
112 * @init.
113 * @stat: Statistics for akcipher algorithm
114 *
115 * @base: Common crypto API algorithm data structure
116 */
117struct akcipher_alg {
118 int (*sign)(struct akcipher_request *req);
119 int (*verify)(struct akcipher_request *req);
120 int (*encrypt)(struct akcipher_request *req);
121 int (*decrypt)(struct akcipher_request *req);
122 int (*set_pub_key)(struct crypto_akcipher *tfm, const void *key,
123 unsigned int keylen);
124 int (*set_priv_key)(struct crypto_akcipher *tfm, const void *key,
125 unsigned int keylen);
126 unsigned int (*max_size)(struct crypto_akcipher *tfm);
127 int (*init)(struct crypto_akcipher *tfm);
128 void (*exit)(struct crypto_akcipher *tfm);
129
130#ifdef CONFIG_CRYPTO_STATS
131 struct crypto_istat_akcipher stat;
132#endif
133
134 struct crypto_alg base;
135};
136
137/**
138 * DOC: Generic Public Key API
139 *
140 * The Public Key API is used with the algorithms of type
141 * CRYPTO_ALG_TYPE_AKCIPHER (listed as type "akcipher" in /proc/crypto)
142 */
143
144/**
145 * crypto_alloc_akcipher() - allocate AKCIPHER tfm handle
146 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
147 * public key algorithm e.g. "rsa"
148 * @type: specifies the type of the algorithm
149 * @mask: specifies the mask for the algorithm
150 *
151 * Allocate a handle for public key algorithm. The returned struct
152 * crypto_akcipher is the handle that is required for any subsequent
153 * API invocation for the public key operations.
154 *
155 * Return: allocated handle in case of success; IS_ERR() is true in case
156 * of an error, PTR_ERR() returns the error code.
157 */
158struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
159 u32 mask);
160
161static inline struct crypto_tfm *crypto_akcipher_tfm(
162 struct crypto_akcipher *tfm)
163{
164 return &tfm->base;
165}
166
167static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg)
168{
169 return container_of(alg, struct akcipher_alg, base);
170}
171
172static inline struct crypto_akcipher *__crypto_akcipher_tfm(
173 struct crypto_tfm *tfm)
174{
175 return container_of(tfm, struct crypto_akcipher, base);
176}
177
178static inline struct akcipher_alg *crypto_akcipher_alg(
179 struct crypto_akcipher *tfm)
180{
181 return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg);
182}
183
184static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
185{
186 return tfm->reqsize;
187}
188
189static inline void akcipher_request_set_tfm(struct akcipher_request *req,
190 struct crypto_akcipher *tfm)
191{
192 req->base.tfm = crypto_akcipher_tfm(tfm);
193}
194
195static inline struct crypto_akcipher *crypto_akcipher_reqtfm(
196 struct akcipher_request *req)
197{
198 return __crypto_akcipher_tfm(req->base.tfm);
199}
200
201/**
202 * crypto_free_akcipher() - free AKCIPHER tfm handle
203 *
204 * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
205 *
206 * If @tfm is a NULL or error pointer, this function does nothing.
207 */
208static inline void crypto_free_akcipher(struct crypto_akcipher *tfm)
209{
210 crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm));
211}
212
213/**
214 * akcipher_request_alloc() - allocates public key request
215 *
216 * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
217 * @gfp: allocation flags
218 *
219 * Return: allocated handle in case of success or NULL in case of an error.
220 */
221static inline struct akcipher_request *akcipher_request_alloc(
222 struct crypto_akcipher *tfm, gfp_t gfp)
223{
224 struct akcipher_request *req;
225
226 req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
227 if (likely(req))
228 akcipher_request_set_tfm(req, tfm);
229
230 return req;
231}
232
233/**
234 * akcipher_request_free() - zeroize and free public key request
235 *
236 * @req: request to free
237 */
238static inline void akcipher_request_free(struct akcipher_request *req)
239{
240 kfree_sensitive(req);
241}
242
243/**
244 * akcipher_request_set_callback() - Sets an asynchronous callback.
245 *
246 * Callback will be called when an asynchronous operation on a given
247 * request is finished.
248 *
249 * @req: request that the callback will be set for
250 * @flgs: specify for instance if the operation may backlog
251 * @cmpl: callback which will be called
252 * @data: private data used by the caller
253 */
254static inline void akcipher_request_set_callback(struct akcipher_request *req,
255 u32 flgs,
256 crypto_completion_t cmpl,
257 void *data)
258{
259 req->base.complete = cmpl;
260 req->base.data = data;
261 req->base.flags = flgs;
262}
263
264/**
265 * akcipher_request_set_crypt() - Sets request parameters
266 *
267 * Sets parameters required by crypto operation
268 *
269 * @req: public key request
270 * @src: ptr to input scatter list
271 * @dst: ptr to output scatter list or NULL for verify op
272 * @src_len: size of the src input scatter list to be processed
273 * @dst_len: size of the dst output scatter list or size of signature
274 * portion in @src for verify op
275 */
276static inline void akcipher_request_set_crypt(struct akcipher_request *req,
277 struct scatterlist *src,
278 struct scatterlist *dst,
279 unsigned int src_len,
280 unsigned int dst_len)
281{
282 req->src = src;
283 req->dst = dst;
284 req->src_len = src_len;
285 req->dst_len = dst_len;
286}
287
288/**
289 * crypto_akcipher_maxsize() - Get len for output buffer
290 *
291 * Function returns the dest buffer size required for a given key.
292 * Function assumes that the key is already set in the transformation. If this
293 * function is called without a setkey or with a failed setkey, you will end up
294 * in a NULL dereference.
295 *
296 * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
297 */
298static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm)
299{
300 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
301
302 return alg->max_size(tfm);
303}
304
305static inline struct crypto_istat_akcipher *akcipher_get_stat(
306 struct akcipher_alg *alg)
307{
308#ifdef CONFIG_CRYPTO_STATS
309 return &alg->stat;
310#else
311 return NULL;
312#endif
313}
314
315static inline int crypto_akcipher_errstat(struct akcipher_alg *alg, int err)
316{
317 if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
318 return err;
319
320 if (err && err != -EINPROGRESS && err != -EBUSY)
321 atomic64_inc(&akcipher_get_stat(alg)->err_cnt);
322
323 return err;
324}
325
326/**
327 * crypto_akcipher_encrypt() - Invoke public key encrypt operation
328 *
329 * Function invokes the specific public key encrypt operation for a given
330 * public key algorithm
331 *
332 * @req: asymmetric key request
333 *
334 * Return: zero on success; error code in case of error
335 */
336static inline int crypto_akcipher_encrypt(struct akcipher_request *req)
337{
338 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
339 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
340
341 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
342 struct crypto_istat_akcipher *istat = akcipher_get_stat(alg);
343
344 atomic64_inc(&istat->encrypt_cnt);
345 atomic64_add(req->src_len, &istat->encrypt_tlen);
346 }
347
348 return crypto_akcipher_errstat(alg, alg->encrypt(req));
349}
350
351/**
352 * crypto_akcipher_decrypt() - Invoke public key decrypt operation
353 *
354 * Function invokes the specific public key decrypt operation for a given
355 * public key algorithm
356 *
357 * @req: asymmetric key request
358 *
359 * Return: zero on success; error code in case of error
360 */
361static inline int crypto_akcipher_decrypt(struct akcipher_request *req)
362{
363 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
364 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
365
366 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
367 struct crypto_istat_akcipher *istat = akcipher_get_stat(alg);
368
369 atomic64_inc(&istat->decrypt_cnt);
370 atomic64_add(req->src_len, &istat->decrypt_tlen);
371 }
372
373 return crypto_akcipher_errstat(alg, alg->decrypt(req));
374}
375
376/**
377 * crypto_akcipher_sync_encrypt() - Invoke public key encrypt operation
378 *
379 * Function invokes the specific public key encrypt operation for a given
380 * public key algorithm
381 *
382 * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
383 * @src: source buffer
384 * @slen: source length
385 * @dst: destination obuffer
386 * @dlen: destination length
387 *
388 * Return: zero on success; error code in case of error
389 */
390int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,
391 const void *src, unsigned int slen,
392 void *dst, unsigned int dlen);
393
394/**
395 * crypto_akcipher_sync_decrypt() - Invoke public key decrypt operation
396 *
397 * Function invokes the specific public key decrypt operation for a given
398 * public key algorithm
399 *
400 * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
401 * @src: source buffer
402 * @slen: source length
403 * @dst: destination obuffer
404 * @dlen: destination length
405 *
406 * Return: Output length on success; error code in case of error
407 */
408int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,
409 const void *src, unsigned int slen,
410 void *dst, unsigned int dlen);
411
412/**
413 * crypto_akcipher_sign() - Invoke public key sign operation
414 *
415 * Function invokes the specific public key sign operation for a given
416 * public key algorithm
417 *
418 * @req: asymmetric key request
419 *
420 * Return: zero on success; error code in case of error
421 */
422static inline int crypto_akcipher_sign(struct akcipher_request *req)
423{
424 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
425 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
426
427 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
428 atomic64_inc(&akcipher_get_stat(alg)->sign_cnt);
429
430 return crypto_akcipher_errstat(alg, alg->sign(req));
431}
432
433/**
434 * crypto_akcipher_verify() - Invoke public key signature verification
435 *
436 * Function invokes the specific public key signature verification operation
437 * for a given public key algorithm.
438 *
439 * @req: asymmetric key request
440 *
441 * Note: req->dst should be NULL, req->src should point to SG of size
442 * (req->src_size + req->dst_size), containing signature (of req->src_size
443 * length) with appended digest (of req->dst_size length).
444 *
445 * Return: zero on verification success; error code in case of error.
446 */
447static inline int crypto_akcipher_verify(struct akcipher_request *req)
448{
449 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
450 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
451
452 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
453 atomic64_inc(&akcipher_get_stat(alg)->verify_cnt);
454
455 return crypto_akcipher_errstat(alg, alg->verify(req));
456}
457
458/**
459 * crypto_akcipher_set_pub_key() - Invoke set public key operation
460 *
461 * Function invokes the algorithm specific set key function, which knows
462 * how to decode and interpret the encoded key and parameters
463 *
464 * @tfm: tfm handle
465 * @key: BER encoded public key, algo OID, paramlen, BER encoded
466 * parameters
467 * @keylen: length of the key (not including other data)
468 *
469 * Return: zero on success; error code in case of error
470 */
471static inline int crypto_akcipher_set_pub_key(struct crypto_akcipher *tfm,
472 const void *key,
473 unsigned int keylen)
474{
475 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
476
477 return alg->set_pub_key(tfm, key, keylen);
478}
479
480/**
481 * crypto_akcipher_set_priv_key() - Invoke set private key operation
482 *
483 * Function invokes the algorithm specific set key function, which knows
484 * how to decode and interpret the encoded key and parameters
485 *
486 * @tfm: tfm handle
487 * @key: BER encoded private key, algo OID, paramlen, BER encoded
488 * parameters
489 * @keylen: length of the key (not including other data)
490 *
491 * Return: zero on success; error code in case of error
492 */
493static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
494 const void *key,
495 unsigned int keylen)
496{
497 struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
498
499 return alg->set_priv_key(tfm, key, keylen);
500}
501#endif
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 */
32struct 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 */
47struct 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 */
92struct 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 */
130struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
131 u32 mask);
132
133static inline struct crypto_tfm *crypto_akcipher_tfm(
134 struct crypto_akcipher *tfm)
135{
136 return &tfm->base;
137}
138
139static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg)
140{
141 return container_of(alg, struct akcipher_alg, base);
142}
143
144static inline struct crypto_akcipher *__crypto_akcipher_tfm(
145 struct crypto_tfm *tfm)
146{
147 return container_of(tfm, struct crypto_akcipher, base);
148}
149
150static 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
156static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
157{
158 return crypto_akcipher_alg(tfm)->reqsize;
159}
160
161static 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
167static 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 */
178static 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 */
191static 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 */
208static 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 */
224static 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 */
245static 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 */
266static 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 */
283static 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 */
301static 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 */
319static 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 */
337static 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 */
357static 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 */
378static 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