2 * Scatterlist Cryptographic API.
4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
5 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
6 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
8 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
9 * and Nettle, by Niels Möller.
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the Free
13 * Software Foundation; either version 2 of the License, or (at your option)
17 #ifndef _LINUX_CRYPTO_H
18 #define _LINUX_CRYPTO_H
20 #include <linux/atomic.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
23 #include <linux/bug.h>
24 #include <linux/slab.h>
25 #include <linux/string.h>
26 #include <linux/uaccess.h>
29 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
30 * arbitrary modules to be loaded. Loading from userspace may still need the
31 * unprefixed names, so retains those aliases as well.
32 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
33 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
34 * expands twice on the same line. Instead, use a separate base name for the
37 #define MODULE_ALIAS_CRYPTO(name) \
38 __MODULE_INFO(alias, alias_userspace, name); \
39 __MODULE_INFO(alias, alias_crypto, "crypto-" name)
42 * Algorithm masks and types.
44 #define CRYPTO_ALG_TYPE_MASK 0x0000000f
45 #define CRYPTO_ALG_TYPE_CIPHER 0x00000001
46 #define CRYPTO_ALG_TYPE_COMPRESS 0x00000002
47 #define CRYPTO_ALG_TYPE_AEAD 0x00000003
48 #define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
49 #define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
50 #define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
51 #define CRYPTO_ALG_TYPE_DIGEST 0x00000008
52 #define CRYPTO_ALG_TYPE_HASH 0x00000008
53 #define CRYPTO_ALG_TYPE_SHASH 0x00000009
54 #define CRYPTO_ALG_TYPE_AHASH 0x0000000a
55 #define CRYPTO_ALG_TYPE_RNG 0x0000000c
56 #define CRYPTO_ALG_TYPE_AKCIPHER 0x0000000d
58 #define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
59 #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000c
60 #define CRYPTO_ALG_TYPE_BLKCIPHER_MASK 0x0000000c
62 #define CRYPTO_ALG_LARVAL 0x00000010
63 #define CRYPTO_ALG_DEAD 0x00000020
64 #define CRYPTO_ALG_DYING 0x00000040
65 #define CRYPTO_ALG_ASYNC 0x00000080
68 * Set this bit if and only if the algorithm requires another algorithm of
69 * the same type to handle corner cases.
71 #define CRYPTO_ALG_NEED_FALLBACK 0x00000100
74 * This bit is set for symmetric key ciphers that have already been wrapped
75 * with a generic IV generator to prevent them from being wrapped again.
77 #define CRYPTO_ALG_GENIV 0x00000200
80 * Set if the algorithm has passed automated run-time testing. Note that
81 * if there is no run-time testing for a given algorithm it is considered
85 #define CRYPTO_ALG_TESTED 0x00000400
88 * Set if the algorithm is an instance that is build from templates.
90 #define CRYPTO_ALG_INSTANCE 0x00000800
92 /* Set this bit if the algorithm provided is hardware accelerated but
93 * not available to userspace via instruction set or so.
95 #define CRYPTO_ALG_KERN_DRIVER_ONLY 0x00001000
98 * Mark a cipher as a service implementation only usable by another
99 * cipher and never by a normal user of the kernel crypto API
101 #define CRYPTO_ALG_INTERNAL 0x00002000
104 * Transform masks and values (for crt_flags).
106 #define CRYPTO_TFM_REQ_MASK 0x000fff00
107 #define CRYPTO_TFM_RES_MASK 0xfff00000
109 #define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
110 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
111 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400
112 #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
113 #define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000
114 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000
115 #define CRYPTO_TFM_RES_BAD_BLOCK_LEN 0x00800000
116 #define CRYPTO_TFM_RES_BAD_FLAGS 0x01000000
119 * Miscellaneous stuff.
121 #define CRYPTO_MAX_ALG_NAME 64
124 * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
125 * declaration) is used to ensure that the crypto_tfm context structure is
126 * aligned correctly for the given architecture so that there are no alignment
127 * faults for C data types. In particular, this is required on platforms such
128 * as arm where pointers are 32-bit aligned but there are data types such as
129 * u64 which require 64-bit alignment.
131 #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
133 #define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))
136 struct crypto_ablkcipher;
137 struct crypto_async_request;
138 struct crypto_blkcipher;
142 struct skcipher_givcrypt_request;
144 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
147 * DOC: Block Cipher Context Data Structures
149 * These data structures define the operating context for each block cipher
153 struct crypto_async_request {
154 struct list_head list;
155 crypto_completion_t complete;
157 struct crypto_tfm *tfm;
162 struct ablkcipher_request {
163 struct crypto_async_request base;
169 struct scatterlist *src;
170 struct scatterlist *dst;
172 void *__ctx[] CRYPTO_MINALIGN_ATTR;
175 struct blkcipher_desc {
176 struct crypto_blkcipher *tfm;
182 struct crypto_tfm *tfm;
183 void (*crfn)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
184 unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
185 const u8 *src, unsigned int nbytes);
190 struct crypto_hash *tfm;
195 * DOC: Block Cipher Algorithm Definitions
197 * These data structures define modular crypto algorithm implementations,
198 * managed via crypto_register_alg() and crypto_unregister_alg().
202 * struct ablkcipher_alg - asynchronous block cipher definition
203 * @min_keysize: Minimum key size supported by the transformation. This is the
204 * smallest key length supported by this transformation algorithm.
205 * This must be set to one of the pre-defined values as this is
206 * not hardware specific. Possible values for this field can be
207 * found via git grep "_MIN_KEY_SIZE" include/crypto/
208 * @max_keysize: Maximum key size supported by the transformation. This is the
209 * largest key length supported by this transformation algorithm.
210 * This must be set to one of the pre-defined values as this is
211 * not hardware specific. Possible values for this field can be
212 * found via git grep "_MAX_KEY_SIZE" include/crypto/
213 * @setkey: Set key for the transformation. This function is used to either
214 * program a supplied key into the hardware or store the key in the
215 * transformation context for programming it later. Note that this
216 * function does modify the transformation context. This function can
217 * be called multiple times during the existence of the transformation
218 * object, so one must make sure the key is properly reprogrammed into
219 * the hardware. This function is also responsible for checking the key
220 * length for validity. In case a software fallback was put in place in
221 * the @cra_init call, this function might need to use the fallback if
222 * the algorithm doesn't support all of the key sizes.
223 * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
224 * the supplied scatterlist containing the blocks of data. The crypto
225 * API consumer is responsible for aligning the entries of the
226 * scatterlist properly and making sure the chunks are correctly
227 * sized. In case a software fallback was put in place in the
228 * @cra_init call, this function might need to use the fallback if
229 * the algorithm doesn't support all of the key sizes. In case the
230 * key was stored in transformation context, the key might need to be
231 * re-programmed into the hardware in this function. This function
232 * shall not modify the transformation context, as this function may
233 * be called in parallel with the same transformation object.
234 * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
235 * and the conditions are exactly the same.
236 * @givencrypt: Update the IV for encryption. With this function, a cipher
237 * implementation may provide the function on how to update the IV
239 * @givdecrypt: Update the IV for decryption. This is the reverse of
241 * @geniv: The transformation implementation may use an "IV generator" provided
242 * by the kernel crypto API. Several use cases have a predefined
243 * approach how IVs are to be updated. For such use cases, the kernel
244 * crypto API provides ready-to-use implementations that can be
245 * referenced with this variable.
246 * @ivsize: IV size applicable for transformation. The consumer must provide an
247 * IV of exactly that size to perform the encrypt or decrypt operation.
249 * All fields except @givencrypt , @givdecrypt , @geniv and @ivsize are
250 * mandatory and must be filled.
252 struct ablkcipher_alg {
253 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
254 unsigned int keylen);
255 int (*encrypt)(struct ablkcipher_request *req);
256 int (*decrypt)(struct ablkcipher_request *req);
257 int (*givencrypt)(struct skcipher_givcrypt_request *req);
258 int (*givdecrypt)(struct skcipher_givcrypt_request *req);
262 unsigned int min_keysize;
263 unsigned int max_keysize;
268 * struct blkcipher_alg - synchronous block cipher definition
269 * @min_keysize: see struct ablkcipher_alg
270 * @max_keysize: see struct ablkcipher_alg
271 * @setkey: see struct ablkcipher_alg
272 * @encrypt: see struct ablkcipher_alg
273 * @decrypt: see struct ablkcipher_alg
274 * @geniv: see struct ablkcipher_alg
275 * @ivsize: see struct ablkcipher_alg
277 * All fields except @geniv and @ivsize are mandatory and must be filled.
279 struct blkcipher_alg {
280 int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
281 unsigned int keylen);
282 int (*encrypt)(struct blkcipher_desc *desc,
283 struct scatterlist *dst, struct scatterlist *src,
284 unsigned int nbytes);
285 int (*decrypt)(struct blkcipher_desc *desc,
286 struct scatterlist *dst, struct scatterlist *src,
287 unsigned int nbytes);
291 unsigned int min_keysize;
292 unsigned int max_keysize;
297 * struct cipher_alg - single-block symmetric ciphers definition
298 * @cia_min_keysize: Minimum key size supported by the transformation. This is
299 * the smallest key length supported by this transformation
300 * algorithm. This must be set to one of the pre-defined
301 * values as this is not hardware specific. Possible values
302 * for this field can be found via git grep "_MIN_KEY_SIZE"
304 * @cia_max_keysize: Maximum key size supported by the transformation. This is
305 * the largest key length supported by this transformation
306 * algorithm. This must be set to one of the pre-defined values
307 * as this is not hardware specific. Possible values for this
308 * field can be found via git grep "_MAX_KEY_SIZE"
310 * @cia_setkey: Set key for the transformation. This function is used to either
311 * program a supplied key into the hardware or store the key in the
312 * transformation context for programming it later. Note that this
313 * function does modify the transformation context. This function
314 * can be called multiple times during the existence of the
315 * transformation object, so one must make sure the key is properly
316 * reprogrammed into the hardware. This function is also
317 * responsible for checking the key length for validity.
318 * @cia_encrypt: Encrypt a single block. This function is used to encrypt a
319 * single block of data, which must be @cra_blocksize big. This
320 * always operates on a full @cra_blocksize and it is not possible
321 * to encrypt a block of smaller size. The supplied buffers must
322 * therefore also be at least of @cra_blocksize size. Both the
323 * input and output buffers are always aligned to @cra_alignmask.
324 * In case either of the input or output buffer supplied by user
325 * of the crypto API is not aligned to @cra_alignmask, the crypto
326 * API will re-align the buffers. The re-alignment means that a
327 * new buffer will be allocated, the data will be copied into the
328 * new buffer, then the processing will happen on the new buffer,
329 * then the data will be copied back into the original buffer and
330 * finally the new buffer will be freed. In case a software
331 * fallback was put in place in the @cra_init call, this function
332 * might need to use the fallback if the algorithm doesn't support
333 * all of the key sizes. In case the key was stored in
334 * transformation context, the key might need to be re-programmed
335 * into the hardware in this function. This function shall not
336 * modify the transformation context, as this function may be
337 * called in parallel with the same transformation object.
338 * @cia_decrypt: Decrypt a single block. This is a reverse counterpart to
339 * @cia_encrypt, and the conditions are exactly the same.
341 * All fields are mandatory and must be filled.
344 unsigned int cia_min_keysize;
345 unsigned int cia_max_keysize;
346 int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
347 unsigned int keylen);
348 void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
349 void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
352 struct compress_alg {
353 int (*coa_compress)(struct crypto_tfm *tfm, const u8 *src,
354 unsigned int slen, u8 *dst, unsigned int *dlen);
355 int (*coa_decompress)(struct crypto_tfm *tfm, const u8 *src,
356 unsigned int slen, u8 *dst, unsigned int *dlen);
360 #define cra_ablkcipher cra_u.ablkcipher
361 #define cra_blkcipher cra_u.blkcipher
362 #define cra_cipher cra_u.cipher
363 #define cra_compress cra_u.compress
366 * struct crypto_alg - definition of a cryptograpic cipher algorithm
367 * @cra_flags: Flags describing this transformation. See include/linux/crypto.h
368 * CRYPTO_ALG_* flags for the flags which go in here. Those are
369 * used for fine-tuning the description of the transformation
371 * @cra_blocksize: Minimum block size of this transformation. The size in bytes
372 * of the smallest possible unit which can be transformed with
373 * this algorithm. The users must respect this value.
374 * In case of HASH transformation, it is possible for a smaller
375 * block than @cra_blocksize to be passed to the crypto API for
376 * transformation, in case of any other transformation type, an
377 * error will be returned upon any attempt to transform smaller
378 * than @cra_blocksize chunks.
379 * @cra_ctxsize: Size of the operational context of the transformation. This
380 * value informs the kernel crypto API about the memory size
381 * needed to be allocated for the transformation context.
382 * @cra_alignmask: Alignment mask for the input and output data buffer. The data
383 * buffer containing the input data for the algorithm must be
384 * aligned to this alignment mask. The data buffer for the
385 * output data must be aligned to this alignment mask. Note that
386 * the Crypto API will do the re-alignment in software, but
387 * only under special conditions and there is a performance hit.
388 * The re-alignment happens at these occasions for different
389 * @cra_u types: cipher -- For both input data and output data
390 * buffer; ahash -- For output hash destination buf; shash --
391 * For output hash destination buf.
392 * This is needed on hardware which is flawed by design and
393 * cannot pick data from arbitrary addresses.
394 * @cra_priority: Priority of this transformation implementation. In case
395 * multiple transformations with same @cra_name are available to
396 * the Crypto API, the kernel will use the one with highest
398 * @cra_name: Generic name (usable by multiple implementations) of the
399 * transformation algorithm. This is the name of the transformation
400 * itself. This field is used by the kernel when looking up the
401 * providers of particular transformation.
402 * @cra_driver_name: Unique name of the transformation provider. This is the
403 * name of the provider of the transformation. This can be any
404 * arbitrary value, but in the usual case, this contains the
405 * name of the chip or provider and the name of the
406 * transformation algorithm.
407 * @cra_type: Type of the cryptographic transformation. This is a pointer to
408 * struct crypto_type, which implements callbacks common for all
409 * transformation types. There are multiple options:
410 * &crypto_blkcipher_type, &crypto_ablkcipher_type,
411 * &crypto_ahash_type, &crypto_rng_type.
412 * This field might be empty. In that case, there are no common
413 * callbacks. This is the case for: cipher, compress, shash.
414 * @cra_u: Callbacks implementing the transformation. This is a union of
415 * multiple structures. Depending on the type of transformation selected
416 * by @cra_type and @cra_flags above, the associated structure must be
417 * filled with callbacks. This field might be empty. This is the case
419 * @cra_init: Initialize the cryptographic transformation object. This function
420 * is used to initialize the cryptographic transformation object.
421 * This function is called only once at the instantiation time, right
422 * after the transformation context was allocated. In case the
423 * cryptographic hardware has some special requirements which need to
424 * be handled by software, this function shall check for the precise
425 * requirement of the transformation and put any software fallbacks
427 * @cra_exit: Deinitialize the cryptographic transformation object. This is a
428 * counterpart to @cra_init, used to remove various changes set in
430 * @cra_module: Owner of this transformation implementation. Set to THIS_MODULE
431 * @cra_list: internally used
432 * @cra_users: internally used
433 * @cra_refcnt: internally used
434 * @cra_destroy: internally used
436 * The struct crypto_alg describes a generic Crypto API algorithm and is common
437 * for all of the transformations. Any variable not documented here shall not
438 * be used by a cipher implementation as it is internal to the Crypto API.
441 struct list_head cra_list;
442 struct list_head cra_users;
445 unsigned int cra_blocksize;
446 unsigned int cra_ctxsize;
447 unsigned int cra_alignmask;
452 char cra_name[CRYPTO_MAX_ALG_NAME];
453 char cra_driver_name[CRYPTO_MAX_ALG_NAME];
455 const struct crypto_type *cra_type;
458 struct ablkcipher_alg ablkcipher;
459 struct blkcipher_alg blkcipher;
460 struct cipher_alg cipher;
461 struct compress_alg compress;
464 int (*cra_init)(struct crypto_tfm *tfm);
465 void (*cra_exit)(struct crypto_tfm *tfm);
466 void (*cra_destroy)(struct crypto_alg *alg);
468 struct module *cra_module;
469 } CRYPTO_MINALIGN_ATTR;
472 * Algorithm registration interface.
474 int crypto_register_alg(struct crypto_alg *alg);
475 int crypto_unregister_alg(struct crypto_alg *alg);
476 int crypto_register_algs(struct crypto_alg *algs, int count);
477 int crypto_unregister_algs(struct crypto_alg *algs, int count);
480 * Algorithm query interface.
482 int crypto_has_alg(const char *name, u32 type, u32 mask);
485 * Transforms: user-instantiated objects which encapsulate algorithms
486 * and core processing logic. Managed via crypto_alloc_*() and
487 * crypto_free_*(), as well as the various helpers below.
490 struct ablkcipher_tfm {
491 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
492 unsigned int keylen);
493 int (*encrypt)(struct ablkcipher_request *req);
494 int (*decrypt)(struct ablkcipher_request *req);
495 int (*givencrypt)(struct skcipher_givcrypt_request *req);
496 int (*givdecrypt)(struct skcipher_givcrypt_request *req);
498 struct crypto_ablkcipher *base;
501 unsigned int reqsize;
504 struct blkcipher_tfm {
506 int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
507 unsigned int keylen);
508 int (*encrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
509 struct scatterlist *src, unsigned int nbytes);
510 int (*decrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
511 struct scatterlist *src, unsigned int nbytes);
515 int (*cit_setkey)(struct crypto_tfm *tfm,
516 const u8 *key, unsigned int keylen);
517 void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
518 void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
522 int (*init)(struct hash_desc *desc);
523 int (*update)(struct hash_desc *desc,
524 struct scatterlist *sg, unsigned int nsg);
525 int (*final)(struct hash_desc *desc, u8 *out);
526 int (*digest)(struct hash_desc *desc, struct scatterlist *sg,
527 unsigned int nsg, u8 *out);
528 int (*setkey)(struct crypto_hash *tfm, const u8 *key,
529 unsigned int keylen);
530 unsigned int digestsize;
533 struct compress_tfm {
534 int (*cot_compress)(struct crypto_tfm *tfm,
535 const u8 *src, unsigned int slen,
536 u8 *dst, unsigned int *dlen);
537 int (*cot_decompress)(struct crypto_tfm *tfm,
538 const u8 *src, unsigned int slen,
539 u8 *dst, unsigned int *dlen);
542 #define crt_ablkcipher crt_u.ablkcipher
543 #define crt_blkcipher crt_u.blkcipher
544 #define crt_cipher crt_u.cipher
545 #define crt_hash crt_u.hash
546 #define crt_compress crt_u.compress
553 struct ablkcipher_tfm ablkcipher;
554 struct blkcipher_tfm blkcipher;
555 struct cipher_tfm cipher;
556 struct hash_tfm hash;
557 struct compress_tfm compress;
560 void (*exit)(struct crypto_tfm *tfm);
562 struct crypto_alg *__crt_alg;
564 void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
567 struct crypto_ablkcipher {
568 struct crypto_tfm base;
571 struct crypto_blkcipher {
572 struct crypto_tfm base;
575 struct crypto_cipher {
576 struct crypto_tfm base;
580 struct crypto_tfm base;
584 struct crypto_tfm base;
595 #define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
597 /* Maximum number of (rtattr) parameters for each template. */
598 #define CRYPTO_MAX_ATTRS 32
600 struct crypto_attr_alg {
601 char name[CRYPTO_MAX_ALG_NAME];
604 struct crypto_attr_type {
609 struct crypto_attr_u32 {
614 * Transform user interface.
617 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
618 void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);
620 static inline void crypto_free_tfm(struct crypto_tfm *tfm)
622 return crypto_destroy_tfm(tfm, tfm);
625 int alg_test(const char *driver, const char *alg, u32 type, u32 mask);
628 * Transform helpers which query the underlying algorithm.
630 static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
632 return tfm->__crt_alg->cra_name;
635 static inline const char *crypto_tfm_alg_driver_name(struct crypto_tfm *tfm)
637 return tfm->__crt_alg->cra_driver_name;
640 static inline int crypto_tfm_alg_priority(struct crypto_tfm *tfm)
642 return tfm->__crt_alg->cra_priority;
645 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
647 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
650 static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
652 return tfm->__crt_alg->cra_blocksize;
655 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
657 return tfm->__crt_alg->cra_alignmask;
660 static inline u32 crypto_tfm_get_flags(struct crypto_tfm *tfm)
662 return tfm->crt_flags;
665 static inline void crypto_tfm_set_flags(struct crypto_tfm *tfm, u32 flags)
667 tfm->crt_flags |= flags;
670 static inline void crypto_tfm_clear_flags(struct crypto_tfm *tfm, u32 flags)
672 tfm->crt_flags &= ~flags;
675 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
677 return tfm->__crt_ctx;
680 static inline unsigned int crypto_tfm_ctx_alignment(void)
682 struct crypto_tfm *tfm;
683 return __alignof__(tfm->__crt_ctx);
689 static inline struct crypto_ablkcipher *__crypto_ablkcipher_cast(
690 struct crypto_tfm *tfm)
692 return (struct crypto_ablkcipher *)tfm;
695 static inline u32 crypto_skcipher_type(u32 type)
697 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
698 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
702 static inline u32 crypto_skcipher_mask(u32 mask)
704 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
705 mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
710 * DOC: Asynchronous Block Cipher API
712 * Asynchronous block cipher API is used with the ciphers of type
713 * CRYPTO_ALG_TYPE_ABLKCIPHER (listed as type "ablkcipher" in /proc/crypto).
715 * Asynchronous cipher operations imply that the function invocation for a
716 * cipher request returns immediately before the completion of the operation.
717 * The cipher request is scheduled as a separate kernel thread and therefore
718 * load-balanced on the different CPUs via the process scheduler. To allow
719 * the kernel crypto API to inform the caller about the completion of a cipher
720 * request, the caller must provide a callback function. That function is
721 * invoked with the cipher handle when the request completes.
723 * To support the asynchronous operation, additional information than just the
724 * cipher handle must be supplied to the kernel crypto API. That additional
725 * information is given by filling in the ablkcipher_request data structure.
727 * For the asynchronous block cipher API, the state is maintained with the tfm
728 * cipher handle. A single tfm can be used across multiple calls and in
729 * parallel. For asynchronous block cipher calls, context data supplied and
730 * only used by the caller can be referenced the request data structure in
731 * addition to the IV used for the cipher request. The maintenance of such
732 * state information would be important for a crypto driver implementer to
733 * have, because when calling the callback function upon completion of the
734 * cipher operation, that callback function may need some information about
735 * which operation just finished if it invoked multiple in parallel. This
736 * state information is unused by the kernel crypto API.
740 * crypto_alloc_ablkcipher() - allocate asynchronous block cipher handle
741 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
743 * @type: specifies the type of the cipher
744 * @mask: specifies the mask for the cipher
746 * Allocate a cipher handle for an ablkcipher. The returned struct
747 * crypto_ablkcipher is the cipher handle that is required for any subsequent
748 * API invocation for that ablkcipher.
750 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
751 * of an error, PTR_ERR() returns the error code.
753 struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
756 static inline struct crypto_tfm *crypto_ablkcipher_tfm(
757 struct crypto_ablkcipher *tfm)
763 * crypto_free_ablkcipher() - zeroize and free cipher handle
764 * @tfm: cipher handle to be freed
766 static inline void crypto_free_ablkcipher(struct crypto_ablkcipher *tfm)
768 crypto_free_tfm(crypto_ablkcipher_tfm(tfm));
772 * crypto_has_ablkcipher() - Search for the availability of an ablkcipher.
773 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
775 * @type: specifies the type of the cipher
776 * @mask: specifies the mask for the cipher
778 * Return: true when the ablkcipher is known to the kernel crypto API; false
781 static inline int crypto_has_ablkcipher(const char *alg_name, u32 type,
784 return crypto_has_alg(alg_name, crypto_skcipher_type(type),
785 crypto_skcipher_mask(mask));
788 static inline struct ablkcipher_tfm *crypto_ablkcipher_crt(
789 struct crypto_ablkcipher *tfm)
791 return &crypto_ablkcipher_tfm(tfm)->crt_ablkcipher;
795 * crypto_ablkcipher_ivsize() - obtain IV size
796 * @tfm: cipher handle
798 * The size of the IV for the ablkcipher referenced by the cipher handle is
799 * returned. This IV size may be zero if the cipher does not need an IV.
801 * Return: IV size in bytes
803 static inline unsigned int crypto_ablkcipher_ivsize(
804 struct crypto_ablkcipher *tfm)
806 return crypto_ablkcipher_crt(tfm)->ivsize;
810 * crypto_ablkcipher_blocksize() - obtain block size of cipher
811 * @tfm: cipher handle
813 * The block size for the ablkcipher referenced with the cipher handle is
814 * returned. The caller may use that information to allocate appropriate
815 * memory for the data returned by the encryption or decryption operation
817 * Return: block size of cipher
819 static inline unsigned int crypto_ablkcipher_blocksize(
820 struct crypto_ablkcipher *tfm)
822 return crypto_tfm_alg_blocksize(crypto_ablkcipher_tfm(tfm));
825 static inline unsigned int crypto_ablkcipher_alignmask(
826 struct crypto_ablkcipher *tfm)
828 return crypto_tfm_alg_alignmask(crypto_ablkcipher_tfm(tfm));
831 static inline u32 crypto_ablkcipher_get_flags(struct crypto_ablkcipher *tfm)
833 return crypto_tfm_get_flags(crypto_ablkcipher_tfm(tfm));
836 static inline void crypto_ablkcipher_set_flags(struct crypto_ablkcipher *tfm,
839 crypto_tfm_set_flags(crypto_ablkcipher_tfm(tfm), flags);
842 static inline void crypto_ablkcipher_clear_flags(struct crypto_ablkcipher *tfm,
845 crypto_tfm_clear_flags(crypto_ablkcipher_tfm(tfm), flags);
849 * crypto_ablkcipher_setkey() - set key for cipher
850 * @tfm: cipher handle
851 * @key: buffer holding the key
852 * @keylen: length of the key in bytes
854 * The caller provided key is set for the ablkcipher referenced by the cipher
857 * Note, the key length determines the cipher type. Many block ciphers implement
858 * different cipher modes depending on the key size, such as AES-128 vs AES-192
859 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
862 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
864 static inline int crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
865 const u8 *key, unsigned int keylen)
867 struct ablkcipher_tfm *crt = crypto_ablkcipher_crt(tfm);
869 return crt->setkey(crt->base, key, keylen);
873 * crypto_ablkcipher_reqtfm() - obtain cipher handle from request
874 * @req: ablkcipher_request out of which the cipher handle is to be obtained
876 * Return the crypto_ablkcipher handle when furnishing an ablkcipher_request
879 * Return: crypto_ablkcipher handle
881 static inline struct crypto_ablkcipher *crypto_ablkcipher_reqtfm(
882 struct ablkcipher_request *req)
884 return __crypto_ablkcipher_cast(req->base.tfm);
888 * crypto_ablkcipher_encrypt() - encrypt plaintext
889 * @req: reference to the ablkcipher_request handle that holds all information
890 * needed to perform the cipher operation
892 * Encrypt plaintext data using the ablkcipher_request handle. That data
893 * structure and how it is filled with data is discussed with the
894 * ablkcipher_request_* functions.
896 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
898 static inline int crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
900 struct ablkcipher_tfm *crt =
901 crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
902 return crt->encrypt(req);
906 * crypto_ablkcipher_decrypt() - decrypt ciphertext
907 * @req: reference to the ablkcipher_request handle that holds all information
908 * needed to perform the cipher operation
910 * Decrypt ciphertext data using the ablkcipher_request handle. That data
911 * structure and how it is filled with data is discussed with the
912 * ablkcipher_request_* functions.
914 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
916 static inline int crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
918 struct ablkcipher_tfm *crt =
919 crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
920 return crt->decrypt(req);
924 * DOC: Asynchronous Cipher Request Handle
926 * The ablkcipher_request data structure contains all pointers to data
927 * required for the asynchronous cipher operation. This includes the cipher
928 * handle (which can be used by multiple ablkcipher_request instances), pointer
929 * to plaintext and ciphertext, asynchronous callback function, etc. It acts
930 * as a handle to the ablkcipher_request_* API calls in a similar way as
931 * ablkcipher handle to the crypto_ablkcipher_* API calls.
935 * crypto_ablkcipher_reqsize() - obtain size of the request data structure
936 * @tfm: cipher handle
938 * Return: number of bytes
940 static inline unsigned int crypto_ablkcipher_reqsize(
941 struct crypto_ablkcipher *tfm)
943 return crypto_ablkcipher_crt(tfm)->reqsize;
947 * ablkcipher_request_set_tfm() - update cipher handle reference in request
948 * @req: request handle to be modified
949 * @tfm: cipher handle that shall be added to the request handle
951 * Allow the caller to replace the existing ablkcipher handle in the request
952 * data structure with a different one.
954 static inline void ablkcipher_request_set_tfm(
955 struct ablkcipher_request *req, struct crypto_ablkcipher *tfm)
957 req->base.tfm = crypto_ablkcipher_tfm(crypto_ablkcipher_crt(tfm)->base);
960 static inline struct ablkcipher_request *ablkcipher_request_cast(
961 struct crypto_async_request *req)
963 return container_of(req, struct ablkcipher_request, base);
967 * ablkcipher_request_alloc() - allocate request data structure
968 * @tfm: cipher handle to be registered with the request
969 * @gfp: memory allocation flag that is handed to kmalloc by the API call.
971 * Allocate the request data structure that must be used with the ablkcipher
972 * encrypt and decrypt API calls. During the allocation, the provided ablkcipher
973 * handle is registered in the request data structure.
975 * Return: allocated request handle in case of success; IS_ERR() is true in case
976 * of an error, PTR_ERR() returns the error code.
978 static inline struct ablkcipher_request *ablkcipher_request_alloc(
979 struct crypto_ablkcipher *tfm, gfp_t gfp)
981 struct ablkcipher_request *req;
983 req = kmalloc(sizeof(struct ablkcipher_request) +
984 crypto_ablkcipher_reqsize(tfm), gfp);
987 ablkcipher_request_set_tfm(req, tfm);
993 * ablkcipher_request_free() - zeroize and free request data structure
994 * @req: request data structure cipher handle to be freed
996 static inline void ablkcipher_request_free(struct ablkcipher_request *req)
1002 * ablkcipher_request_set_callback() - set asynchronous callback function
1003 * @req: request handle
1004 * @flags: specify zero or an ORing of the flags
1005 * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
1006 * increase the wait queue beyond the initial maximum size;
1007 * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
1008 * @compl: callback function pointer to be registered with the request handle
1009 * @data: The data pointer refers to memory that is not used by the kernel
1010 * crypto API, but provided to the callback function for it to use. Here,
1011 * the caller can provide a reference to memory the callback function can
1012 * operate on. As the callback function is invoked asynchronously to the
1013 * related functionality, it may need to access data structures of the
1014 * related functionality which can be referenced using this pointer. The
1015 * callback function can access the memory via the "data" field in the
1016 * crypto_async_request data structure provided to the callback function.
1018 * This function allows setting the callback function that is triggered once the
1019 * cipher operation completes.
1021 * The callback function is registered with the ablkcipher_request handle and
1022 * must comply with the following template
1024 * void callback_function(struct crypto_async_request *req, int error)
1026 static inline void ablkcipher_request_set_callback(
1027 struct ablkcipher_request *req,
1028 u32 flags, crypto_completion_t compl, void *data)
1030 req->base.complete = compl;
1031 req->base.data = data;
1032 req->base.flags = flags;
1036 * ablkcipher_request_set_crypt() - set data buffers
1037 * @req: request handle
1038 * @src: source scatter / gather list
1039 * @dst: destination scatter / gather list
1040 * @nbytes: number of bytes to process from @src
1041 * @iv: IV for the cipher operation which must comply with the IV size defined
1042 * by crypto_ablkcipher_ivsize
1044 * This function allows setting of the source data and destination data
1045 * scatter / gather lists.
1047 * For encryption, the source is treated as the plaintext and the
1048 * destination is the ciphertext. For a decryption operation, the use is
1049 * reversed - the source is the ciphertext and the destination is the plaintext.
1051 static inline void ablkcipher_request_set_crypt(
1052 struct ablkcipher_request *req,
1053 struct scatterlist *src, struct scatterlist *dst,
1054 unsigned int nbytes, void *iv)
1058 req->nbytes = nbytes;
1063 * DOC: Synchronous Block Cipher API
1065 * The synchronous block cipher API is used with the ciphers of type
1066 * CRYPTO_ALG_TYPE_BLKCIPHER (listed as type "blkcipher" in /proc/crypto)
1068 * Synchronous calls, have a context in the tfm. But since a single tfm can be
1069 * used in multiple calls and in parallel, this info should not be changeable
1070 * (unless a lock is used). This applies, for example, to the symmetric key.
1071 * However, the IV is changeable, so there is an iv field in blkcipher_tfm
1072 * structure for synchronous blkcipher api. So, its the only state info that can
1073 * be kept for synchronous calls without using a big lock across a tfm.
1075 * The block cipher API allows the use of a complete cipher, i.e. a cipher
1076 * consisting of a template (a block chaining mode) and a single block cipher
1077 * primitive (e.g. AES).
1079 * The plaintext data buffer and the ciphertext data buffer are pointed to
1080 * by using scatter/gather lists. The cipher operation is performed
1081 * on all segments of the provided scatter/gather lists.
1083 * The kernel crypto API supports a cipher operation "in-place" which means that
1084 * the caller may provide the same scatter/gather list for the plaintext and
1085 * cipher text. After the completion of the cipher operation, the plaintext
1086 * data is replaced with the ciphertext data in case of an encryption and vice
1087 * versa for a decryption. The caller must ensure that the scatter/gather lists
1088 * for the output data point to sufficiently large buffers, i.e. multiples of
1089 * the block size of the cipher.
1092 static inline struct crypto_blkcipher *__crypto_blkcipher_cast(
1093 struct crypto_tfm *tfm)
1095 return (struct crypto_blkcipher *)tfm;
1098 static inline struct crypto_blkcipher *crypto_blkcipher_cast(
1099 struct crypto_tfm *tfm)
1101 BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_BLKCIPHER);
1102 return __crypto_blkcipher_cast(tfm);
1106 * crypto_alloc_blkcipher() - allocate synchronous block cipher handle
1107 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1109 * @type: specifies the type of the cipher
1110 * @mask: specifies the mask for the cipher
1112 * Allocate a cipher handle for a block cipher. The returned struct
1113 * crypto_blkcipher is the cipher handle that is required for any subsequent
1114 * API invocation for that block cipher.
1116 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
1117 * of an error, PTR_ERR() returns the error code.
1119 static inline struct crypto_blkcipher *crypto_alloc_blkcipher(
1120 const char *alg_name, u32 type, u32 mask)
1122 type &= ~CRYPTO_ALG_TYPE_MASK;
1123 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
1124 mask |= CRYPTO_ALG_TYPE_MASK;
1126 return __crypto_blkcipher_cast(crypto_alloc_base(alg_name, type, mask));
1129 static inline struct crypto_tfm *crypto_blkcipher_tfm(
1130 struct crypto_blkcipher *tfm)
1136 * crypto_free_blkcipher() - zeroize and free the block cipher handle
1137 * @tfm: cipher handle to be freed
1139 static inline void crypto_free_blkcipher(struct crypto_blkcipher *tfm)
1141 crypto_free_tfm(crypto_blkcipher_tfm(tfm));
1145 * crypto_has_blkcipher() - Search for the availability of a block cipher
1146 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1148 * @type: specifies the type of the cipher
1149 * @mask: specifies the mask for the cipher
1151 * Return: true when the block cipher is known to the kernel crypto API; false
1154 static inline int crypto_has_blkcipher(const char *alg_name, u32 type, u32 mask)
1156 type &= ~CRYPTO_ALG_TYPE_MASK;
1157 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
1158 mask |= CRYPTO_ALG_TYPE_MASK;
1160 return crypto_has_alg(alg_name, type, mask);
1164 * crypto_blkcipher_name() - return the name / cra_name from the cipher handle
1165 * @tfm: cipher handle
1167 * Return: The character string holding the name of the cipher
1169 static inline const char *crypto_blkcipher_name(struct crypto_blkcipher *tfm)
1171 return crypto_tfm_alg_name(crypto_blkcipher_tfm(tfm));
1174 static inline struct blkcipher_tfm *crypto_blkcipher_crt(
1175 struct crypto_blkcipher *tfm)
1177 return &crypto_blkcipher_tfm(tfm)->crt_blkcipher;
1180 static inline struct blkcipher_alg *crypto_blkcipher_alg(
1181 struct crypto_blkcipher *tfm)
1183 return &crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher;
1187 * crypto_blkcipher_ivsize() - obtain IV size
1188 * @tfm: cipher handle
1190 * The size of the IV for the block cipher referenced by the cipher handle is
1191 * returned. This IV size may be zero if the cipher does not need an IV.
1193 * Return: IV size in bytes
1195 static inline unsigned int crypto_blkcipher_ivsize(struct crypto_blkcipher *tfm)
1197 return crypto_blkcipher_alg(tfm)->ivsize;
1201 * crypto_blkcipher_blocksize() - obtain block size of cipher
1202 * @tfm: cipher handle
1204 * The block size for the block cipher referenced with the cipher handle is
1205 * returned. The caller may use that information to allocate appropriate
1206 * memory for the data returned by the encryption or decryption operation.
1208 * Return: block size of cipher
1210 static inline unsigned int crypto_blkcipher_blocksize(
1211 struct crypto_blkcipher *tfm)
1213 return crypto_tfm_alg_blocksize(crypto_blkcipher_tfm(tfm));
1216 static inline unsigned int crypto_blkcipher_alignmask(
1217 struct crypto_blkcipher *tfm)
1219 return crypto_tfm_alg_alignmask(crypto_blkcipher_tfm(tfm));
1222 static inline u32 crypto_blkcipher_get_flags(struct crypto_blkcipher *tfm)
1224 return crypto_tfm_get_flags(crypto_blkcipher_tfm(tfm));
1227 static inline void crypto_blkcipher_set_flags(struct crypto_blkcipher *tfm,
1230 crypto_tfm_set_flags(crypto_blkcipher_tfm(tfm), flags);
1233 static inline void crypto_blkcipher_clear_flags(struct crypto_blkcipher *tfm,
1236 crypto_tfm_clear_flags(crypto_blkcipher_tfm(tfm), flags);
1240 * crypto_blkcipher_setkey() - set key for cipher
1241 * @tfm: cipher handle
1242 * @key: buffer holding the key
1243 * @keylen: length of the key in bytes
1245 * The caller provided key is set for the block cipher referenced by the cipher
1248 * Note, the key length determines the cipher type. Many block ciphers implement
1249 * different cipher modes depending on the key size, such as AES-128 vs AES-192
1250 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
1253 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
1255 static inline int crypto_blkcipher_setkey(struct crypto_blkcipher *tfm,
1256 const u8 *key, unsigned int keylen)
1258 return crypto_blkcipher_crt(tfm)->setkey(crypto_blkcipher_tfm(tfm),
1263 * crypto_blkcipher_encrypt() - encrypt plaintext
1264 * @desc: reference to the block cipher handle with meta data
1265 * @dst: scatter/gather list that is filled by the cipher operation with the
1267 * @src: scatter/gather list that holds the plaintext
1268 * @nbytes: number of bytes of the plaintext to encrypt.
1270 * Encrypt plaintext data using the IV set by the caller with a preceding
1271 * call of crypto_blkcipher_set_iv.
1273 * The blkcipher_desc data structure must be filled by the caller and can
1274 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
1275 * with the block cipher handle; desc.flags is filled with either
1276 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
1278 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
1280 static inline int crypto_blkcipher_encrypt(struct blkcipher_desc *desc,
1281 struct scatterlist *dst,
1282 struct scatterlist *src,
1283 unsigned int nbytes)
1285 desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
1286 return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
1290 * crypto_blkcipher_encrypt_iv() - encrypt plaintext with dedicated IV
1291 * @desc: reference to the block cipher handle with meta data
1292 * @dst: scatter/gather list that is filled by the cipher operation with the
1294 * @src: scatter/gather list that holds the plaintext
1295 * @nbytes: number of bytes of the plaintext to encrypt.
1297 * Encrypt plaintext data with the use of an IV that is solely used for this
1298 * cipher operation. Any previously set IV is not used.
1300 * The blkcipher_desc data structure must be filled by the caller and can
1301 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
1302 * with the block cipher handle; desc.info is filled with the IV to be used for
1303 * the current operation; desc.flags is filled with either
1304 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
1306 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
1308 static inline int crypto_blkcipher_encrypt_iv(struct blkcipher_desc *desc,
1309 struct scatterlist *dst,
1310 struct scatterlist *src,
1311 unsigned int nbytes)
1313 return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
1317 * crypto_blkcipher_decrypt() - decrypt ciphertext
1318 * @desc: reference to the block cipher handle with meta data
1319 * @dst: scatter/gather list that is filled by the cipher operation with the
1321 * @src: scatter/gather list that holds the ciphertext
1322 * @nbytes: number of bytes of the ciphertext to decrypt.
1324 * Decrypt ciphertext data using the IV set by the caller with a preceding
1325 * call of crypto_blkcipher_set_iv.
1327 * The blkcipher_desc data structure must be filled by the caller as documented
1328 * for the crypto_blkcipher_encrypt call above.
1330 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
1333 static inline int crypto_blkcipher_decrypt(struct blkcipher_desc *desc,
1334 struct scatterlist *dst,
1335 struct scatterlist *src,
1336 unsigned int nbytes)
1338 desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
1339 return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
1343 * crypto_blkcipher_decrypt_iv() - decrypt ciphertext with dedicated IV
1344 * @desc: reference to the block cipher handle with meta data
1345 * @dst: scatter/gather list that is filled by the cipher operation with the
1347 * @src: scatter/gather list that holds the ciphertext
1348 * @nbytes: number of bytes of the ciphertext to decrypt.
1350 * Decrypt ciphertext data with the use of an IV that is solely used for this
1351 * cipher operation. Any previously set IV is not used.
1353 * The blkcipher_desc data structure must be filled by the caller as documented
1354 * for the crypto_blkcipher_encrypt_iv call above.
1356 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
1358 static inline int crypto_blkcipher_decrypt_iv(struct blkcipher_desc *desc,
1359 struct scatterlist *dst,
1360 struct scatterlist *src,
1361 unsigned int nbytes)
1363 return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
1367 * crypto_blkcipher_set_iv() - set IV for cipher
1368 * @tfm: cipher handle
1369 * @src: buffer holding the IV
1370 * @len: length of the IV in bytes
1372 * The caller provided IV is set for the block cipher referenced by the cipher
1375 static inline void crypto_blkcipher_set_iv(struct crypto_blkcipher *tfm,
1376 const u8 *src, unsigned int len)
1378 memcpy(crypto_blkcipher_crt(tfm)->iv, src, len);
1382 * crypto_blkcipher_get_iv() - obtain IV from cipher
1383 * @tfm: cipher handle
1384 * @dst: buffer filled with the IV
1385 * @len: length of the buffer dst
1387 * The caller can obtain the IV set for the block cipher referenced by the
1388 * cipher handle and store it into the user-provided buffer. If the buffer
1389 * has an insufficient space, the IV is truncated to fit the buffer.
1391 static inline void crypto_blkcipher_get_iv(struct crypto_blkcipher *tfm,
1392 u8 *dst, unsigned int len)
1394 memcpy(dst, crypto_blkcipher_crt(tfm)->iv, len);
1398 * DOC: Single Block Cipher API
1400 * The single block cipher API is used with the ciphers of type
1401 * CRYPTO_ALG_TYPE_CIPHER (listed as type "cipher" in /proc/crypto).
1403 * Using the single block cipher API calls, operations with the basic cipher
1404 * primitive can be implemented. These cipher primitives exclude any block
1405 * chaining operations including IV handling.
1407 * The purpose of this single block cipher API is to support the implementation
1408 * of templates or other concepts that only need to perform the cipher operation
1409 * on one block at a time. Templates invoke the underlying cipher primitive
1410 * block-wise and process either the input or the output data of these cipher
1414 static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
1416 return (struct crypto_cipher *)tfm;
1419 static inline struct crypto_cipher *crypto_cipher_cast(struct crypto_tfm *tfm)
1421 BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
1422 return __crypto_cipher_cast(tfm);
1426 * crypto_alloc_cipher() - allocate single block cipher handle
1427 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1428 * single block cipher
1429 * @type: specifies the type of the cipher
1430 * @mask: specifies the mask for the cipher
1432 * Allocate a cipher handle for a single block cipher. The returned struct
1433 * crypto_cipher is the cipher handle that is required for any subsequent API
1434 * invocation for that single block cipher.
1436 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
1437 * of an error, PTR_ERR() returns the error code.
1439 static inline struct crypto_cipher *crypto_alloc_cipher(const char *alg_name,
1442 type &= ~CRYPTO_ALG_TYPE_MASK;
1443 type |= CRYPTO_ALG_TYPE_CIPHER;
1444 mask |= CRYPTO_ALG_TYPE_MASK;
1446 return __crypto_cipher_cast(crypto_alloc_base(alg_name, type, mask));
1449 static inline struct crypto_tfm *crypto_cipher_tfm(struct crypto_cipher *tfm)
1455 * crypto_free_cipher() - zeroize and free the single block cipher handle
1456 * @tfm: cipher handle to be freed
1458 static inline void crypto_free_cipher(struct crypto_cipher *tfm)
1460 crypto_free_tfm(crypto_cipher_tfm(tfm));
1464 * crypto_has_cipher() - Search for the availability of a single block cipher
1465 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1466 * single block cipher
1467 * @type: specifies the type of the cipher
1468 * @mask: specifies the mask for the cipher
1470 * Return: true when the single block cipher is known to the kernel crypto API;
1473 static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
1475 type &= ~CRYPTO_ALG_TYPE_MASK;
1476 type |= CRYPTO_ALG_TYPE_CIPHER;
1477 mask |= CRYPTO_ALG_TYPE_MASK;
1479 return crypto_has_alg(alg_name, type, mask);
1482 static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
1484 return &crypto_cipher_tfm(tfm)->crt_cipher;
1488 * crypto_cipher_blocksize() - obtain block size for cipher
1489 * @tfm: cipher handle
1491 * The block size for the single block cipher referenced with the cipher handle
1492 * tfm is returned. The caller may use that information to allocate appropriate
1493 * memory for the data returned by the encryption or decryption operation
1495 * Return: block size of cipher
1497 static inline unsigned int crypto_cipher_blocksize(struct crypto_cipher *tfm)
1499 return crypto_tfm_alg_blocksize(crypto_cipher_tfm(tfm));
1502 static inline unsigned int crypto_cipher_alignmask(struct crypto_cipher *tfm)
1504 return crypto_tfm_alg_alignmask(crypto_cipher_tfm(tfm));
1507 static inline u32 crypto_cipher_get_flags(struct crypto_cipher *tfm)
1509 return crypto_tfm_get_flags(crypto_cipher_tfm(tfm));
1512 static inline void crypto_cipher_set_flags(struct crypto_cipher *tfm,
1515 crypto_tfm_set_flags(crypto_cipher_tfm(tfm), flags);
1518 static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
1521 crypto_tfm_clear_flags(crypto_cipher_tfm(tfm), flags);
1525 * crypto_cipher_setkey() - set key for cipher
1526 * @tfm: cipher handle
1527 * @key: buffer holding the key
1528 * @keylen: length of the key in bytes
1530 * The caller provided key is set for the single block cipher referenced by the
1533 * Note, the key length determines the cipher type. Many block ciphers implement
1534 * different cipher modes depending on the key size, such as AES-128 vs AES-192
1535 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
1538 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
1540 static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
1541 const u8 *key, unsigned int keylen)
1543 return crypto_cipher_crt(tfm)->cit_setkey(crypto_cipher_tfm(tfm),
1548 * crypto_cipher_encrypt_one() - encrypt one block of plaintext
1549 * @tfm: cipher handle
1550 * @dst: points to the buffer that will be filled with the ciphertext
1551 * @src: buffer holding the plaintext to be encrypted
1553 * Invoke the encryption operation of one block. The caller must ensure that
1554 * the plaintext and ciphertext buffers are at least one block in size.
1556 static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
1557 u8 *dst, const u8 *src)
1559 crypto_cipher_crt(tfm)->cit_encrypt_one(crypto_cipher_tfm(tfm),
1564 * crypto_cipher_decrypt_one() - decrypt one block of ciphertext
1565 * @tfm: cipher handle
1566 * @dst: points to the buffer that will be filled with the plaintext
1567 * @src: buffer holding the ciphertext to be decrypted
1569 * Invoke the decryption operation of one block. The caller must ensure that
1570 * the plaintext and ciphertext buffers are at least one block in size.
1572 static inline void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
1573 u8 *dst, const u8 *src)
1575 crypto_cipher_crt(tfm)->cit_decrypt_one(crypto_cipher_tfm(tfm),
1580 * DOC: Synchronous Message Digest API
1582 * The synchronous message digest API is used with the ciphers of type
1583 * CRYPTO_ALG_TYPE_HASH (listed as type "hash" in /proc/crypto)
1586 static inline struct crypto_hash *__crypto_hash_cast(struct crypto_tfm *tfm)
1588 return (struct crypto_hash *)tfm;
1591 static inline struct crypto_hash *crypto_hash_cast(struct crypto_tfm *tfm)
1593 BUG_ON((crypto_tfm_alg_type(tfm) ^ CRYPTO_ALG_TYPE_HASH) &
1594 CRYPTO_ALG_TYPE_HASH_MASK);
1595 return __crypto_hash_cast(tfm);
1599 * crypto_alloc_hash() - allocate synchronous message digest handle
1600 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1601 * message digest cipher
1602 * @type: specifies the type of the cipher
1603 * @mask: specifies the mask for the cipher
1605 * Allocate a cipher handle for a message digest. The returned struct
1606 * crypto_hash is the cipher handle that is required for any subsequent
1607 * API invocation for that message digest.
1609 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
1610 * of an error, PTR_ERR() returns the error code.
1612 static inline struct crypto_hash *crypto_alloc_hash(const char *alg_name,
1615 type &= ~CRYPTO_ALG_TYPE_MASK;
1616 mask &= ~CRYPTO_ALG_TYPE_MASK;
1617 type |= CRYPTO_ALG_TYPE_HASH;
1618 mask |= CRYPTO_ALG_TYPE_HASH_MASK;
1620 return __crypto_hash_cast(crypto_alloc_base(alg_name, type, mask));
1623 static inline struct crypto_tfm *crypto_hash_tfm(struct crypto_hash *tfm)
1629 * crypto_free_hash() - zeroize and free message digest handle
1630 * @tfm: cipher handle to be freed
1632 static inline void crypto_free_hash(struct crypto_hash *tfm)
1634 crypto_free_tfm(crypto_hash_tfm(tfm));
1638 * crypto_has_hash() - Search for the availability of a message digest
1639 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
1640 * message digest cipher
1641 * @type: specifies the type of the cipher
1642 * @mask: specifies the mask for the cipher
1644 * Return: true when the message digest cipher is known to the kernel crypto
1645 * API; false otherwise
1647 static inline int crypto_has_hash(const char *alg_name, u32 type, u32 mask)
1649 type &= ~CRYPTO_ALG_TYPE_MASK;
1650 mask &= ~CRYPTO_ALG_TYPE_MASK;
1651 type |= CRYPTO_ALG_TYPE_HASH;
1652 mask |= CRYPTO_ALG_TYPE_HASH_MASK;
1654 return crypto_has_alg(alg_name, type, mask);
1657 static inline struct hash_tfm *crypto_hash_crt(struct crypto_hash *tfm)
1659 return &crypto_hash_tfm(tfm)->crt_hash;
1663 * crypto_hash_blocksize() - obtain block size for message digest
1664 * @tfm: cipher handle
1666 * The block size for the message digest cipher referenced with the cipher
1667 * handle is returned.
1669 * Return: block size of cipher
1671 static inline unsigned int crypto_hash_blocksize(struct crypto_hash *tfm)
1673 return crypto_tfm_alg_blocksize(crypto_hash_tfm(tfm));
1676 static inline unsigned int crypto_hash_alignmask(struct crypto_hash *tfm)
1678 return crypto_tfm_alg_alignmask(crypto_hash_tfm(tfm));
1682 * crypto_hash_digestsize() - obtain message digest size
1683 * @tfm: cipher handle
1685 * The size for the message digest created by the message digest cipher
1686 * referenced with the cipher handle is returned.
1688 * Return: message digest size
1690 static inline unsigned int crypto_hash_digestsize(struct crypto_hash *tfm)
1692 return crypto_hash_crt(tfm)->digestsize;
1695 static inline u32 crypto_hash_get_flags(struct crypto_hash *tfm)
1697 return crypto_tfm_get_flags(crypto_hash_tfm(tfm));
1700 static inline void crypto_hash_set_flags(struct crypto_hash *tfm, u32 flags)
1702 crypto_tfm_set_flags(crypto_hash_tfm(tfm), flags);
1705 static inline void crypto_hash_clear_flags(struct crypto_hash *tfm, u32 flags)
1707 crypto_tfm_clear_flags(crypto_hash_tfm(tfm), flags);
1711 * crypto_hash_init() - (re)initialize message digest handle
1712 * @desc: cipher request handle that to be filled by caller --
1713 * desc.tfm is filled with the hash cipher handle;
1714 * desc.flags is filled with either CRYPTO_TFM_REQ_MAY_SLEEP or 0.
1716 * The call (re-)initializes the message digest referenced by the hash cipher
1717 * request handle. Any potentially existing state created by previous
1718 * operations is discarded.
1720 * Return: 0 if the message digest initialization was successful; < 0 if an
1723 static inline int crypto_hash_init(struct hash_desc *desc)
1725 return crypto_hash_crt(desc->tfm)->init(desc);
1729 * crypto_hash_update() - add data to message digest for processing
1730 * @desc: cipher request handle
1731 * @sg: scatter / gather list pointing to the data to be added to the message
1733 * @nbytes: number of bytes to be processed from @sg
1735 * Updates the message digest state of the cipher handle pointed to by the
1736 * hash cipher request handle with the input data pointed to by the
1737 * scatter/gather list.
1739 * Return: 0 if the message digest update was successful; < 0 if an error
1742 static inline int crypto_hash_update(struct hash_desc *desc,
1743 struct scatterlist *sg,
1744 unsigned int nbytes)
1746 return crypto_hash_crt(desc->tfm)->update(desc, sg, nbytes);
1750 * crypto_hash_final() - calculate message digest
1751 * @desc: cipher request handle
1752 * @out: message digest output buffer -- The caller must ensure that the out
1753 * buffer has a sufficient size (e.g. by using the crypto_hash_digestsize
1756 * Finalize the message digest operation and create the message digest
1757 * based on all data added to the cipher handle. The message digest is placed
1758 * into the output buffer.
1760 * Return: 0 if the message digest creation was successful; < 0 if an error
1763 static inline int crypto_hash_final(struct hash_desc *desc, u8 *out)
1765 return crypto_hash_crt(desc->tfm)->final(desc, out);
1769 * crypto_hash_digest() - calculate message digest for a buffer
1770 * @desc: see crypto_hash_final()
1771 * @sg: see crypto_hash_update()
1772 * @nbytes: see crypto_hash_update()
1773 * @out: see crypto_hash_final()
1775 * This function is a "short-hand" for the function calls of crypto_hash_init,
1776 * crypto_hash_update and crypto_hash_final. The parameters have the same
1777 * meaning as discussed for those separate three functions.
1779 * Return: 0 if the message digest creation was successful; < 0 if an error
1782 static inline int crypto_hash_digest(struct hash_desc *desc,
1783 struct scatterlist *sg,
1784 unsigned int nbytes, u8 *out)
1786 return crypto_hash_crt(desc->tfm)->digest(desc, sg, nbytes, out);
1790 * crypto_hash_setkey() - set key for message digest
1791 * @hash: cipher handle
1792 * @key: buffer holding the key
1793 * @keylen: length of the key in bytes
1795 * The caller provided key is set for the message digest cipher. The cipher
1796 * handle must point to a keyed hash in order for this function to succeed.
1798 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
1800 static inline int crypto_hash_setkey(struct crypto_hash *hash,
1801 const u8 *key, unsigned int keylen)
1803 return crypto_hash_crt(hash)->setkey(hash, key, keylen);
1806 static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
1808 return (struct crypto_comp *)tfm;
1811 static inline struct crypto_comp *crypto_comp_cast(struct crypto_tfm *tfm)
1813 BUG_ON((crypto_tfm_alg_type(tfm) ^ CRYPTO_ALG_TYPE_COMPRESS) &
1814 CRYPTO_ALG_TYPE_MASK);
1815 return __crypto_comp_cast(tfm);
1818 static inline struct crypto_comp *crypto_alloc_comp(const char *alg_name,
1821 type &= ~CRYPTO_ALG_TYPE_MASK;
1822 type |= CRYPTO_ALG_TYPE_COMPRESS;
1823 mask |= CRYPTO_ALG_TYPE_MASK;
1825 return __crypto_comp_cast(crypto_alloc_base(alg_name, type, mask));
1828 static inline struct crypto_tfm *crypto_comp_tfm(struct crypto_comp *tfm)
1833 static inline void crypto_free_comp(struct crypto_comp *tfm)
1835 crypto_free_tfm(crypto_comp_tfm(tfm));
1838 static inline int crypto_has_comp(const char *alg_name, u32 type, u32 mask)
1840 type &= ~CRYPTO_ALG_TYPE_MASK;
1841 type |= CRYPTO_ALG_TYPE_COMPRESS;
1842 mask |= CRYPTO_ALG_TYPE_MASK;
1844 return crypto_has_alg(alg_name, type, mask);
1847 static inline const char *crypto_comp_name(struct crypto_comp *tfm)
1849 return crypto_tfm_alg_name(crypto_comp_tfm(tfm));
1852 static inline struct compress_tfm *crypto_comp_crt(struct crypto_comp *tfm)
1854 return &crypto_comp_tfm(tfm)->crt_compress;
1857 static inline int crypto_comp_compress(struct crypto_comp *tfm,
1858 const u8 *src, unsigned int slen,
1859 u8 *dst, unsigned int *dlen)
1861 return crypto_comp_crt(tfm)->cot_compress(crypto_comp_tfm(tfm),
1862 src, slen, dst, dlen);
1865 static inline int crypto_comp_decompress(struct crypto_comp *tfm,
1866 const u8 *src, unsigned int slen,
1867 u8 *dst, unsigned int *dlen)
1869 return crypto_comp_crt(tfm)->cot_decompress(crypto_comp_tfm(tfm),
1870 src, slen, dst, dlen);
1873 #endif /* _LINUX_CRYPTO_H */