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743edf57 HX |
1 | /* |
2 | * AEAD: Authenticated Encryption with Associated Data | |
3 | * | |
b0d955ba | 4 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
743edf57 HX |
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_AEAD_H | |
14 | #define _CRYPTO_AEAD_H | |
15 | ||
16 | #include <linux/crypto.h> | |
17 | #include <linux/kernel.h> | |
3a282bd2 | 18 | #include <linux/slab.h> |
743edf57 | 19 | |
5d1d65f8 HX |
20 | /** |
21 | * DOC: Authenticated Encryption With Associated Data (AEAD) Cipher API | |
22 | * | |
23 | * The AEAD cipher API is used with the ciphers of type CRYPTO_ALG_TYPE_AEAD | |
24 | * (listed as type "aead" in /proc/crypto) | |
25 | * | |
26 | * The most prominent examples for this type of encryption is GCM and CCM. | |
27 | * However, the kernel supports other types of AEAD ciphers which are defined | |
28 | * with the following cipher string: | |
29 | * | |
30 | * authenc(keyed message digest, block cipher) | |
31 | * | |
32 | * For example: authenc(hmac(sha256), cbc(aes)) | |
33 | * | |
3981d37f SM |
34 | * The example code provided for the symmetric key cipher operation |
35 | * applies here as well. Naturally all *skcipher* symbols must be exchanged | |
12f7c14a | 36 | * the *aead* pendants discussed in the following. In addition, for the AEAD |
3981d37f | 37 | * operation, the aead_request_set_ad function must be used to set the |
5d1d65f8 HX |
38 | * pointer to the associated data memory location before performing the |
39 | * encryption or decryption operation. In case of an encryption, the associated | |
40 | * data memory is filled during the encryption operation. For decryption, the | |
41 | * associated data memory must contain data that is used to verify the integrity | |
42 | * of the decrypted data. Another deviation from the asynchronous block cipher | |
43 | * operation is that the caller should explicitly check for -EBADMSG of the | |
44 | * crypto_aead_decrypt. That error indicates an authentication error, i.e. | |
45 | * a breach in the integrity of the message. In essence, that -EBADMSG error | |
46 | * code is the key bonus an AEAD cipher has over "standard" block chaining | |
47 | * modes. | |
f6e45c24 SM |
48 | * |
49 | * Memory Structure: | |
50 | * | |
51 | * To support the needs of the most prominent user of AEAD ciphers, namely | |
52 | * IPSEC, the AEAD ciphers have a special memory layout the caller must adhere | |
53 | * to. | |
54 | * | |
55 | * The scatter list pointing to the input data must contain: | |
56 | * | |
57 | * * for RFC4106 ciphers, the concatenation of | |
58 | * associated authentication data || IV || plaintext or ciphertext. Note, the | |
59 | * same IV (buffer) is also set with the aead_request_set_crypt call. Note, | |
60 | * the API call of aead_request_set_ad must provide the length of the AAD and | |
61 | * the IV. The API call of aead_request_set_crypt only points to the size of | |
62 | * the input plaintext or ciphertext. | |
63 | * | |
64 | * * for "normal" AEAD ciphers, the concatenation of | |
65 | * associated authentication data || plaintext or ciphertext. | |
66 | * | |
67 | * It is important to note that if multiple scatter gather list entries form | |
68 | * the input data mentioned above, the first entry must not point to a NULL | |
69 | * buffer. If there is any potential where the AAD buffer can be NULL, the | |
70 | * calling code must contain a precaution to ensure that this does not result | |
71 | * in the first scatter gather list entry pointing to a NULL buffer. | |
5d1d65f8 HX |
72 | */ |
73 | ||
b0d955ba HX |
74 | struct crypto_aead; |
75 | ||
5d1d65f8 HX |
76 | /** |
77 | * struct aead_request - AEAD request | |
78 | * @base: Common attributes for async crypto requests | |
79 | * @assoclen: Length in bytes of associated data for authentication | |
80 | * @cryptlen: Length of data to be encrypted or decrypted | |
81 | * @iv: Initialisation vector | |
5d1d65f8 HX |
82 | * @src: Source data |
83 | * @dst: Destination data | |
84 | * @__ctx: Start of private context data | |
85 | */ | |
86 | struct aead_request { | |
87 | struct crypto_async_request base; | |
88 | ||
89 | unsigned int assoclen; | |
90 | unsigned int cryptlen; | |
91 | ||
92 | u8 *iv; | |
93 | ||
5d1d65f8 HX |
94 | struct scatterlist *src; |
95 | struct scatterlist *dst; | |
96 | ||
97 | void *__ctx[] CRYPTO_MINALIGN_ATTR; | |
98 | }; | |
99 | ||
63293c61 HX |
100 | /** |
101 | * struct aead_alg - AEAD cipher definition | |
102 | * @maxauthsize: Set the maximum authentication tag size supported by the | |
103 | * transformation. A transformation may support smaller tag sizes. | |
104 | * As the authentication tag is a message digest to ensure the | |
105 | * integrity of the encrypted data, a consumer typically wants the | |
106 | * largest authentication tag possible as defined by this | |
107 | * variable. | |
108 | * @setauthsize: Set authentication size for the AEAD transformation. This | |
109 | * function is used to specify the consumer requested size of the | |
110 | * authentication tag to be either generated by the transformation | |
111 | * during encryption or the size of the authentication tag to be | |
112 | * supplied during the decryption operation. This function is also | |
113 | * responsible for checking the authentication tag size for | |
114 | * validity. | |
115 | * @setkey: see struct ablkcipher_alg | |
116 | * @encrypt: see struct ablkcipher_alg | |
117 | * @decrypt: see struct ablkcipher_alg | |
118 | * @geniv: see struct ablkcipher_alg | |
119 | * @ivsize: see struct ablkcipher_alg | |
5eb8ec6d HX |
120 | * @init: Initialize the cryptographic transformation object. This function |
121 | * is used to initialize the cryptographic transformation object. | |
122 | * This function is called only once at the instantiation time, right | |
123 | * after the transformation context was allocated. In case the | |
124 | * cryptographic hardware has some special requirements which need to | |
125 | * be handled by software, this function shall check for the precise | |
126 | * requirement of the transformation and put any software fallbacks | |
127 | * in place. | |
128 | * @exit: Deinitialize the cryptographic transformation object. This is a | |
129 | * counterpart to @init, used to remove various changes set in | |
130 | * @init. | |
70e088fe | 131 | * @base: Definition of a generic crypto cipher algorithm. |
63293c61 HX |
132 | * |
133 | * All fields except @ivsize is mandatory and must be filled. | |
134 | */ | |
135 | struct aead_alg { | |
136 | int (*setkey)(struct crypto_aead *tfm, const u8 *key, | |
137 | unsigned int keylen); | |
138 | int (*setauthsize)(struct crypto_aead *tfm, unsigned int authsize); | |
139 | int (*encrypt)(struct aead_request *req); | |
140 | int (*decrypt)(struct aead_request *req); | |
5eb8ec6d HX |
141 | int (*init)(struct crypto_aead *tfm); |
142 | void (*exit)(struct crypto_aead *tfm); | |
63293c61 HX |
143 | |
144 | const char *geniv; | |
145 | ||
146 | unsigned int ivsize; | |
147 | unsigned int maxauthsize; | |
148 | ||
149 | struct crypto_alg base; | |
150 | }; | |
151 | ||
5d1d65f8 | 152 | struct crypto_aead { |
5d1d65f8 HX |
153 | unsigned int authsize; |
154 | unsigned int reqsize; | |
155 | ||
156 | struct crypto_tfm base; | |
157 | }; | |
158 | ||
159 | static inline struct crypto_aead *__crypto_aead_cast(struct crypto_tfm *tfm) | |
160 | { | |
161 | return container_of(tfm, struct crypto_aead, base); | |
162 | } | |
163 | ||
164 | /** | |
165 | * crypto_alloc_aead() - allocate AEAD cipher handle | |
166 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
167 | * AEAD cipher | |
168 | * @type: specifies the type of the cipher | |
169 | * @mask: specifies the mask for the cipher | |
170 | * | |
171 | * Allocate a cipher handle for an AEAD. The returned struct | |
172 | * crypto_aead is the cipher handle that is required for any subsequent | |
173 | * API invocation for that AEAD. | |
174 | * | |
175 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
176 | * of an error, PTR_ERR() returns the error code. | |
177 | */ | |
178 | struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask); | |
179 | ||
180 | static inline struct crypto_tfm *crypto_aead_tfm(struct crypto_aead *tfm) | |
181 | { | |
182 | return &tfm->base; | |
183 | } | |
184 | ||
185 | /** | |
186 | * crypto_free_aead() - zeroize and free aead handle | |
187 | * @tfm: cipher handle to be freed | |
188 | */ | |
189 | static inline void crypto_free_aead(struct crypto_aead *tfm) | |
190 | { | |
191 | crypto_destroy_tfm(tfm, crypto_aead_tfm(tfm)); | |
192 | } | |
193 | ||
30e4c010 HX |
194 | static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm) |
195 | { | |
196 | return container_of(crypto_aead_tfm(tfm)->__crt_alg, | |
197 | struct aead_alg, base); | |
198 | } | |
199 | ||
200 | static inline unsigned int crypto_aead_alg_ivsize(struct aead_alg *alg) | |
201 | { | |
b0d955ba | 202 | return alg->ivsize; |
30e4c010 HX |
203 | } |
204 | ||
5d1d65f8 HX |
205 | /** |
206 | * crypto_aead_ivsize() - obtain IV size | |
207 | * @tfm: cipher handle | |
208 | * | |
209 | * The size of the IV for the aead referenced by the cipher handle is | |
210 | * returned. This IV size may be zero if the cipher does not need an IV. | |
211 | * | |
212 | * Return: IV size in bytes | |
213 | */ | |
214 | static inline unsigned int crypto_aead_ivsize(struct crypto_aead *tfm) | |
215 | { | |
30e4c010 | 216 | return crypto_aead_alg_ivsize(crypto_aead_alg(tfm)); |
5d1d65f8 HX |
217 | } |
218 | ||
219 | /** | |
220 | * crypto_aead_authsize() - obtain maximum authentication data size | |
221 | * @tfm: cipher handle | |
222 | * | |
223 | * The maximum size of the authentication data for the AEAD cipher referenced | |
224 | * by the AEAD cipher handle is returned. The authentication data size may be | |
225 | * zero if the cipher implements a hard-coded maximum. | |
226 | * | |
227 | * The authentication data may also be known as "tag value". | |
228 | * | |
229 | * Return: authentication data size / tag size in bytes | |
230 | */ | |
231 | static inline unsigned int crypto_aead_authsize(struct crypto_aead *tfm) | |
232 | { | |
233 | return tfm->authsize; | |
234 | } | |
235 | ||
236 | /** | |
237 | * crypto_aead_blocksize() - obtain block size of cipher | |
238 | * @tfm: cipher handle | |
239 | * | |
240 | * The block size for the AEAD referenced with the cipher handle is returned. | |
241 | * The caller may use that information to allocate appropriate memory for the | |
242 | * data returned by the encryption or decryption operation | |
243 | * | |
244 | * Return: block size of cipher | |
245 | */ | |
246 | static inline unsigned int crypto_aead_blocksize(struct crypto_aead *tfm) | |
247 | { | |
248 | return crypto_tfm_alg_blocksize(crypto_aead_tfm(tfm)); | |
249 | } | |
250 | ||
251 | static inline unsigned int crypto_aead_alignmask(struct crypto_aead *tfm) | |
252 | { | |
253 | return crypto_tfm_alg_alignmask(crypto_aead_tfm(tfm)); | |
254 | } | |
255 | ||
256 | static inline u32 crypto_aead_get_flags(struct crypto_aead *tfm) | |
257 | { | |
258 | return crypto_tfm_get_flags(crypto_aead_tfm(tfm)); | |
259 | } | |
260 | ||
261 | static inline void crypto_aead_set_flags(struct crypto_aead *tfm, u32 flags) | |
262 | { | |
263 | crypto_tfm_set_flags(crypto_aead_tfm(tfm), flags); | |
264 | } | |
265 | ||
266 | static inline void crypto_aead_clear_flags(struct crypto_aead *tfm, u32 flags) | |
267 | { | |
268 | crypto_tfm_clear_flags(crypto_aead_tfm(tfm), flags); | |
269 | } | |
270 | ||
271 | /** | |
272 | * crypto_aead_setkey() - set key for cipher | |
273 | * @tfm: cipher handle | |
274 | * @key: buffer holding the key | |
275 | * @keylen: length of the key in bytes | |
276 | * | |
277 | * The caller provided key is set for the AEAD referenced by the cipher | |
278 | * handle. | |
279 | * | |
280 | * Note, the key length determines the cipher type. Many block ciphers implement | |
281 | * different cipher modes depending on the key size, such as AES-128 vs AES-192 | |
282 | * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128 | |
283 | * is performed. | |
284 | * | |
285 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
286 | */ | |
287 | int crypto_aead_setkey(struct crypto_aead *tfm, | |
288 | const u8 *key, unsigned int keylen); | |
289 | ||
290 | /** | |
291 | * crypto_aead_setauthsize() - set authentication data size | |
292 | * @tfm: cipher handle | |
293 | * @authsize: size of the authentication data / tag in bytes | |
294 | * | |
295 | * Set the authentication data size / tag size. AEAD requires an authentication | |
296 | * tag (or MAC) in addition to the associated data. | |
297 | * | |
298 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
299 | */ | |
300 | int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize); | |
301 | ||
302 | static inline struct crypto_aead *crypto_aead_reqtfm(struct aead_request *req) | |
303 | { | |
304 | return __crypto_aead_cast(req->base.tfm); | |
305 | } | |
306 | ||
307 | /** | |
308 | * crypto_aead_encrypt() - encrypt plaintext | |
309 | * @req: reference to the aead_request handle that holds all information | |
310 | * needed to perform the cipher operation | |
311 | * | |
312 | * Encrypt plaintext data using the aead_request handle. That data structure | |
313 | * and how it is filled with data is discussed with the aead_request_* | |
314 | * functions. | |
315 | * | |
316 | * IMPORTANT NOTE The encryption operation creates the authentication data / | |
317 | * tag. That data is concatenated with the created ciphertext. | |
318 | * The ciphertext memory size is therefore the given number of | |
319 | * block cipher blocks + the size defined by the | |
320 | * crypto_aead_setauthsize invocation. The caller must ensure | |
321 | * that sufficient memory is available for the ciphertext and | |
322 | * the authentication tag. | |
323 | * | |
324 | * Return: 0 if the cipher operation was successful; < 0 if an error occurred | |
325 | */ | |
326 | static inline int crypto_aead_encrypt(struct aead_request *req) | |
327 | { | |
b0d955ba | 328 | return crypto_aead_alg(crypto_aead_reqtfm(req))->encrypt(req); |
5d1d65f8 HX |
329 | } |
330 | ||
331 | /** | |
332 | * crypto_aead_decrypt() - decrypt ciphertext | |
333 | * @req: reference to the ablkcipher_request handle that holds all information | |
334 | * needed to perform the cipher operation | |
335 | * | |
336 | * Decrypt ciphertext data using the aead_request handle. That data structure | |
337 | * and how it is filled with data is discussed with the aead_request_* | |
338 | * functions. | |
339 | * | |
340 | * IMPORTANT NOTE The caller must concatenate the ciphertext followed by the | |
341 | * authentication data / tag. That authentication data / tag | |
342 | * must have the size defined by the crypto_aead_setauthsize | |
343 | * invocation. | |
344 | * | |
345 | * | |
346 | * Return: 0 if the cipher operation was successful; -EBADMSG: The AEAD | |
347 | * cipher operation performs the authentication of the data during the | |
348 | * decryption operation. Therefore, the function returns this error if | |
349 | * the authentication of the ciphertext was unsuccessful (i.e. the | |
350 | * integrity of the ciphertext or the associated data was violated); | |
351 | * < 0 if an error occurred. | |
352 | */ | |
353 | static inline int crypto_aead_decrypt(struct aead_request *req) | |
354 | { | |
b0d955ba HX |
355 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
356 | ||
357 | if (req->cryptlen < crypto_aead_authsize(aead)) | |
5d1d65f8 HX |
358 | return -EINVAL; |
359 | ||
b0d955ba | 360 | return crypto_aead_alg(aead)->decrypt(req); |
5d1d65f8 HX |
361 | } |
362 | ||
363 | /** | |
364 | * DOC: Asynchronous AEAD Request Handle | |
365 | * | |
366 | * The aead_request data structure contains all pointers to data required for | |
367 | * the AEAD cipher operation. This includes the cipher handle (which can be | |
368 | * used by multiple aead_request instances), pointer to plaintext and | |
369 | * ciphertext, asynchronous callback function, etc. It acts as a handle to the | |
370 | * aead_request_* API calls in a similar way as AEAD handle to the | |
371 | * crypto_aead_* API calls. | |
372 | */ | |
373 | ||
374 | /** | |
375 | * crypto_aead_reqsize() - obtain size of the request data structure | |
376 | * @tfm: cipher handle | |
377 | * | |
378 | * Return: number of bytes | |
379 | */ | |
b0d955ba HX |
380 | static inline unsigned int crypto_aead_reqsize(struct crypto_aead *tfm) |
381 | { | |
382 | return tfm->reqsize; | |
383 | } | |
5d1d65f8 HX |
384 | |
385 | /** | |
386 | * aead_request_set_tfm() - update cipher handle reference in request | |
387 | * @req: request handle to be modified | |
388 | * @tfm: cipher handle that shall be added to the request handle | |
389 | * | |
390 | * Allow the caller to replace the existing aead handle in the request | |
391 | * data structure with a different one. | |
392 | */ | |
393 | static inline void aead_request_set_tfm(struct aead_request *req, | |
394 | struct crypto_aead *tfm) | |
395 | { | |
b0d955ba | 396 | req->base.tfm = crypto_aead_tfm(tfm); |
5d1d65f8 HX |
397 | } |
398 | ||
399 | /** | |
400 | * aead_request_alloc() - allocate request data structure | |
401 | * @tfm: cipher handle to be registered with the request | |
402 | * @gfp: memory allocation flag that is handed to kmalloc by the API call. | |
403 | * | |
404 | * Allocate the request data structure that must be used with the AEAD | |
405 | * encrypt and decrypt API calls. During the allocation, the provided aead | |
406 | * handle is registered in the request data structure. | |
407 | * | |
408 | * Return: allocated request handle in case of success; IS_ERR() is true in case | |
409 | * of an error, PTR_ERR() returns the error code. | |
410 | */ | |
411 | static inline struct aead_request *aead_request_alloc(struct crypto_aead *tfm, | |
412 | gfp_t gfp) | |
413 | { | |
414 | struct aead_request *req; | |
415 | ||
416 | req = kmalloc(sizeof(*req) + crypto_aead_reqsize(tfm), gfp); | |
417 | ||
418 | if (likely(req)) | |
419 | aead_request_set_tfm(req, tfm); | |
420 | ||
421 | return req; | |
422 | } | |
423 | ||
424 | /** | |
425 | * aead_request_free() - zeroize and free request data structure | |
426 | * @req: request data structure cipher handle to be freed | |
427 | */ | |
428 | static inline void aead_request_free(struct aead_request *req) | |
429 | { | |
430 | kzfree(req); | |
431 | } | |
432 | ||
433 | /** | |
434 | * aead_request_set_callback() - set asynchronous callback function | |
435 | * @req: request handle | |
436 | * @flags: specify zero or an ORing of the flags | |
437 | * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and | |
438 | * increase the wait queue beyond the initial maximum size; | |
439 | * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep | |
440 | * @compl: callback function pointer to be registered with the request handle | |
441 | * @data: The data pointer refers to memory that is not used by the kernel | |
442 | * crypto API, but provided to the callback function for it to use. Here, | |
443 | * the caller can provide a reference to memory the callback function can | |
444 | * operate on. As the callback function is invoked asynchronously to the | |
445 | * related functionality, it may need to access data structures of the | |
446 | * related functionality which can be referenced using this pointer. The | |
447 | * callback function can access the memory via the "data" field in the | |
448 | * crypto_async_request data structure provided to the callback function. | |
449 | * | |
450 | * Setting the callback function that is triggered once the cipher operation | |
451 | * completes | |
452 | * | |
453 | * The callback function is registered with the aead_request handle and | |
454 | * must comply with the following template | |
455 | * | |
456 | * void callback_function(struct crypto_async_request *req, int error) | |
457 | */ | |
458 | static inline void aead_request_set_callback(struct aead_request *req, | |
459 | u32 flags, | |
460 | crypto_completion_t compl, | |
461 | void *data) | |
462 | { | |
463 | req->base.complete = compl; | |
464 | req->base.data = data; | |
465 | req->base.flags = flags; | |
466 | } | |
467 | ||
468 | /** | |
469 | * aead_request_set_crypt - set data buffers | |
470 | * @req: request handle | |
471 | * @src: source scatter / gather list | |
472 | * @dst: destination scatter / gather list | |
473 | * @cryptlen: number of bytes to process from @src | |
474 | * @iv: IV for the cipher operation which must comply with the IV size defined | |
475 | * by crypto_aead_ivsize() | |
476 | * | |
addfda2f SM |
477 | * Setting the source data and destination data scatter / gather lists which |
478 | * hold the associated data concatenated with the plaintext or ciphertext. See | |
479 | * below for the authentication tag. | |
5d1d65f8 HX |
480 | * |
481 | * For encryption, the source is treated as the plaintext and the | |
482 | * destination is the ciphertext. For a decryption operation, the use is | |
483 | * reversed - the source is the ciphertext and the destination is the plaintext. | |
484 | * | |
693b549d HX |
485 | * For both src/dst the layout is associated data, plain/cipher text, |
486 | * authentication tag. | |
487 | * | |
488 | * The content of the AD in the destination buffer after processing | |
489 | * will either be untouched, or it will contain a copy of the AD | |
490 | * from the source buffer. In order to ensure that it always has | |
491 | * a copy of the AD, the user must copy the AD over either before | |
492 | * or after processing. Of course this is not relevant if the user | |
493 | * is doing in-place processing where src == dst. | |
996d98d8 | 494 | * |
5d1d65f8 HX |
495 | * IMPORTANT NOTE AEAD requires an authentication tag (MAC). For decryption, |
496 | * the caller must concatenate the ciphertext followed by the | |
497 | * authentication tag and provide the entire data stream to the | |
498 | * decryption operation (i.e. the data length used for the | |
499 | * initialization of the scatterlist and the data length for the | |
500 | * decryption operation is identical). For encryption, however, | |
501 | * the authentication tag is created while encrypting the data. | |
502 | * The destination buffer must hold sufficient space for the | |
503 | * ciphertext and the authentication tag while the encryption | |
504 | * invocation must only point to the plaintext data size. The | |
505 | * following code snippet illustrates the memory usage | |
506 | * buffer = kmalloc(ptbuflen + (enc ? authsize : 0)); | |
507 | * sg_init_one(&sg, buffer, ptbuflen + (enc ? authsize : 0)); | |
508 | * aead_request_set_crypt(req, &sg, &sg, ptbuflen, iv); | |
509 | */ | |
510 | static inline void aead_request_set_crypt(struct aead_request *req, | |
511 | struct scatterlist *src, | |
512 | struct scatterlist *dst, | |
513 | unsigned int cryptlen, u8 *iv) | |
514 | { | |
515 | req->src = src; | |
516 | req->dst = dst; | |
517 | req->cryptlen = cryptlen; | |
518 | req->iv = iv; | |
519 | } | |
520 | ||
996d98d8 HX |
521 | /** |
522 | * aead_request_set_ad - set associated data information | |
523 | * @req: request handle | |
524 | * @assoclen: number of bytes in associated data | |
996d98d8 HX |
525 | * |
526 | * Setting the AD information. This function sets the length of | |
693b549d | 527 | * the associated data. |
996d98d8 HX |
528 | */ |
529 | static inline void aead_request_set_ad(struct aead_request *req, | |
374d4ad1 | 530 | unsigned int assoclen) |
996d98d8 HX |
531 | { |
532 | req->assoclen = assoclen; | |
3a282bd2 HX |
533 | } |
534 | ||
743edf57 | 535 | #endif /* _CRYPTO_AEAD_H */ |