1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Scatterlist Cryptographic API.
5 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
6 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
7 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
9 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
10 * and Nettle, by Niels Möller.
12 #ifndef _LINUX_CRYPTO_H
13 #define _LINUX_CRYPTO_H
15 #include <linux/atomic.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/bug.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21 #include <linux/uaccess.h>
22 #include <linux/completion.h>
25 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
26 * arbitrary modules to be loaded. Loading from userspace may still need the
27 * unprefixed names, so retains those aliases as well.
28 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
29 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
30 * expands twice on the same line. Instead, use a separate base name for the
33 #define MODULE_ALIAS_CRYPTO(name) \
34 __MODULE_INFO(alias, alias_userspace, name); \
35 __MODULE_INFO(alias, alias_crypto, "crypto-" name)
38 * Algorithm masks and types.
40 #define CRYPTO_ALG_TYPE_MASK 0x0000000f
41 #define CRYPTO_ALG_TYPE_CIPHER 0x00000001
42 #define CRYPTO_ALG_TYPE_COMPRESS 0x00000002
43 #define CRYPTO_ALG_TYPE_AEAD 0x00000003
44 #define CRYPTO_ALG_TYPE_SKCIPHER 0x00000005
45 #define CRYPTO_ALG_TYPE_KPP 0x00000008
46 #define CRYPTO_ALG_TYPE_ACOMPRESS 0x0000000a
47 #define CRYPTO_ALG_TYPE_SCOMPRESS 0x0000000b
48 #define CRYPTO_ALG_TYPE_RNG 0x0000000c
49 #define CRYPTO_ALG_TYPE_AKCIPHER 0x0000000d
50 #define CRYPTO_ALG_TYPE_HASH 0x0000000e
51 #define CRYPTO_ALG_TYPE_SHASH 0x0000000e
52 #define CRYPTO_ALG_TYPE_AHASH 0x0000000f
54 #define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
55 #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
56 #define CRYPTO_ALG_TYPE_ACOMPRESS_MASK 0x0000000e
58 #define CRYPTO_ALG_LARVAL 0x00000010
59 #define CRYPTO_ALG_DEAD 0x00000020
60 #define CRYPTO_ALG_DYING 0x00000040
61 #define CRYPTO_ALG_ASYNC 0x00000080
64 * Set this bit if and only if the algorithm requires another algorithm of
65 * the same type to handle corner cases.
67 #define CRYPTO_ALG_NEED_FALLBACK 0x00000100
70 * Set if the algorithm has passed automated run-time testing. Note that
71 * if there is no run-time testing for a given algorithm it is considered
75 #define CRYPTO_ALG_TESTED 0x00000400
78 * Set if the algorithm is an instance that is built from templates.
80 #define CRYPTO_ALG_INSTANCE 0x00000800
82 /* Set this bit if the algorithm provided is hardware accelerated but
83 * not available to userspace via instruction set or so.
85 #define CRYPTO_ALG_KERN_DRIVER_ONLY 0x00001000
88 * Mark a cipher as a service implementation only usable by another
89 * cipher and never by a normal user of the kernel crypto API
91 #define CRYPTO_ALG_INTERNAL 0x00002000
94 * Set if the algorithm has a ->setkey() method but can be used without
95 * calling it first, i.e. there is a default key.
97 #define CRYPTO_ALG_OPTIONAL_KEY 0x00004000
100 * Don't trigger module loading
102 #define CRYPTO_NOLOAD 0x00008000
105 * Transform masks and values (for crt_flags).
107 #define CRYPTO_TFM_NEED_KEY 0x00000001
109 #define CRYPTO_TFM_REQ_MASK 0x000fff00
110 #define CRYPTO_TFM_RES_MASK 0xfff00000
112 #define CRYPTO_TFM_REQ_FORBID_WEAK_KEYS 0x00000100
113 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
114 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400
115 #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
118 * Miscellaneous stuff.
120 #define CRYPTO_MAX_ALG_NAME 128
123 * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
124 * declaration) is used to ensure that the crypto_tfm context structure is
125 * aligned correctly for the given architecture so that there are no alignment
126 * faults for C data types. In particular, this is required on platforms such
127 * as arm where pointers are 32-bit aligned but there are data types such as
128 * u64 which require 64-bit alignment.
130 #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
132 #define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))
135 struct crypto_async_request;
139 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
142 * DOC: Block Cipher Context Data Structures
144 * These data structures define the operating context for each block cipher
148 struct crypto_async_request {
149 struct list_head list;
150 crypto_completion_t complete;
152 struct crypto_tfm *tfm;
158 * DOC: Block Cipher Algorithm Definitions
160 * These data structures define modular crypto algorithm implementations,
161 * managed via crypto_register_alg() and crypto_unregister_alg().
165 * struct cipher_alg - single-block symmetric ciphers definition
166 * @cia_min_keysize: Minimum key size supported by the transformation. This is
167 * the smallest key length supported by this transformation
168 * algorithm. This must be set to one of the pre-defined
169 * values as this is not hardware specific. Possible values
170 * for this field can be found via git grep "_MIN_KEY_SIZE"
172 * @cia_max_keysize: Maximum key size supported by the transformation. This is
173 * the largest key length supported by this transformation
174 * algorithm. This must be set to one of the pre-defined values
175 * as this is not hardware specific. Possible values for this
176 * field can be found via git grep "_MAX_KEY_SIZE"
178 * @cia_setkey: Set key for the transformation. This function is used to either
179 * program a supplied key into the hardware or store the key in the
180 * transformation context for programming it later. Note that this
181 * function does modify the transformation context. This function
182 * can be called multiple times during the existence of the
183 * transformation object, so one must make sure the key is properly
184 * reprogrammed into the hardware. This function is also
185 * responsible for checking the key length for validity.
186 * @cia_encrypt: Encrypt a single block. This function is used to encrypt a
187 * single block of data, which must be @cra_blocksize big. This
188 * always operates on a full @cra_blocksize and it is not possible
189 * to encrypt a block of smaller size. The supplied buffers must
190 * therefore also be at least of @cra_blocksize size. Both the
191 * input and output buffers are always aligned to @cra_alignmask.
192 * In case either of the input or output buffer supplied by user
193 * of the crypto API is not aligned to @cra_alignmask, the crypto
194 * API will re-align the buffers. The re-alignment means that a
195 * new buffer will be allocated, the data will be copied into the
196 * new buffer, then the processing will happen on the new buffer,
197 * then the data will be copied back into the original buffer and
198 * finally the new buffer will be freed. In case a software
199 * fallback was put in place in the @cra_init call, this function
200 * might need to use the fallback if the algorithm doesn't support
201 * all of the key sizes. In case the key was stored in
202 * transformation context, the key might need to be re-programmed
203 * into the hardware in this function. This function shall not
204 * modify the transformation context, as this function may be
205 * called in parallel with the same transformation object.
206 * @cia_decrypt: Decrypt a single block. This is a reverse counterpart to
207 * @cia_encrypt, and the conditions are exactly the same.
209 * All fields are mandatory and must be filled.
212 unsigned int cia_min_keysize;
213 unsigned int cia_max_keysize;
214 int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
215 unsigned int keylen);
216 void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
217 void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
221 * struct compress_alg - compression/decompression algorithm
222 * @coa_compress: Compress a buffer of specified length, storing the resulting
223 * data in the specified buffer. Return the length of the
224 * compressed data in dlen.
225 * @coa_decompress: Decompress the source buffer, storing the uncompressed
226 * data in the specified buffer. The length of the data is
229 * All fields are mandatory.
231 struct compress_alg {
232 int (*coa_compress)(struct crypto_tfm *tfm, const u8 *src,
233 unsigned int slen, u8 *dst, unsigned int *dlen);
234 int (*coa_decompress)(struct crypto_tfm *tfm, const u8 *src,
235 unsigned int slen, u8 *dst, unsigned int *dlen);
238 #ifdef CONFIG_CRYPTO_STATS
240 * struct crypto_istat_aead - statistics for AEAD algorithm
241 * @encrypt_cnt: number of encrypt requests
242 * @encrypt_tlen: total data size handled by encrypt requests
243 * @decrypt_cnt: number of decrypt requests
244 * @decrypt_tlen: total data size handled by decrypt requests
245 * @err_cnt: number of error for AEAD requests
247 struct crypto_istat_aead {
248 atomic64_t encrypt_cnt;
249 atomic64_t encrypt_tlen;
250 atomic64_t decrypt_cnt;
251 atomic64_t decrypt_tlen;
256 * struct crypto_istat_akcipher - statistics for akcipher algorithm
257 * @encrypt_cnt: number of encrypt requests
258 * @encrypt_tlen: total data size handled by encrypt requests
259 * @decrypt_cnt: number of decrypt requests
260 * @decrypt_tlen: total data size handled by decrypt requests
261 * @verify_cnt: number of verify operation
262 * @sign_cnt: number of sign requests
263 * @err_cnt: number of error for akcipher requests
265 struct crypto_istat_akcipher {
266 atomic64_t encrypt_cnt;
267 atomic64_t encrypt_tlen;
268 atomic64_t decrypt_cnt;
269 atomic64_t decrypt_tlen;
270 atomic64_t verify_cnt;
276 * struct crypto_istat_cipher - statistics for cipher algorithm
277 * @encrypt_cnt: number of encrypt requests
278 * @encrypt_tlen: total data size handled by encrypt requests
279 * @decrypt_cnt: number of decrypt requests
280 * @decrypt_tlen: total data size handled by decrypt requests
281 * @err_cnt: number of error for cipher requests
283 struct crypto_istat_cipher {
284 atomic64_t encrypt_cnt;
285 atomic64_t encrypt_tlen;
286 atomic64_t decrypt_cnt;
287 atomic64_t decrypt_tlen;
292 * struct crypto_istat_compress - statistics for compress algorithm
293 * @compress_cnt: number of compress requests
294 * @compress_tlen: total data size handled by compress requests
295 * @decompress_cnt: number of decompress requests
296 * @decompress_tlen: total data size handled by decompress requests
297 * @err_cnt: number of error for compress requests
299 struct crypto_istat_compress {
300 atomic64_t compress_cnt;
301 atomic64_t compress_tlen;
302 atomic64_t decompress_cnt;
303 atomic64_t decompress_tlen;
308 * struct crypto_istat_hash - statistics for has algorithm
309 * @hash_cnt: number of hash requests
310 * @hash_tlen: total data size hashed
311 * @err_cnt: number of error for hash requests
313 struct crypto_istat_hash {
315 atomic64_t hash_tlen;
320 * struct crypto_istat_kpp - statistics for KPP algorithm
321 * @setsecret_cnt: number of setsecrey operation
322 * @generate_public_key_cnt: number of generate_public_key operation
323 * @compute_shared_secret_cnt: number of compute_shared_secret operation
324 * @err_cnt: number of error for KPP requests
326 struct crypto_istat_kpp {
327 atomic64_t setsecret_cnt;
328 atomic64_t generate_public_key_cnt;
329 atomic64_t compute_shared_secret_cnt;
334 * struct crypto_istat_rng: statistics for RNG algorithm
335 * @generate_cnt: number of RNG generate requests
336 * @generate_tlen: total data size of generated data by the RNG
337 * @seed_cnt: number of times the RNG was seeded
338 * @err_cnt: number of error for RNG requests
340 struct crypto_istat_rng {
341 atomic64_t generate_cnt;
342 atomic64_t generate_tlen;
346 #endif /* CONFIG_CRYPTO_STATS */
348 #define cra_cipher cra_u.cipher
349 #define cra_compress cra_u.compress
352 * struct crypto_alg - definition of a cryptograpic cipher algorithm
353 * @cra_flags: Flags describing this transformation. See include/linux/crypto.h
354 * CRYPTO_ALG_* flags for the flags which go in here. Those are
355 * used for fine-tuning the description of the transformation
357 * @cra_blocksize: Minimum block size of this transformation. The size in bytes
358 * of the smallest possible unit which can be transformed with
359 * this algorithm. The users must respect this value.
360 * In case of HASH transformation, it is possible for a smaller
361 * block than @cra_blocksize to be passed to the crypto API for
362 * transformation, in case of any other transformation type, an
363 * error will be returned upon any attempt to transform smaller
364 * than @cra_blocksize chunks.
365 * @cra_ctxsize: Size of the operational context of the transformation. This
366 * value informs the kernel crypto API about the memory size
367 * needed to be allocated for the transformation context.
368 * @cra_alignmask: Alignment mask for the input and output data buffer. The data
369 * buffer containing the input data for the algorithm must be
370 * aligned to this alignment mask. The data buffer for the
371 * output data must be aligned to this alignment mask. Note that
372 * the Crypto API will do the re-alignment in software, but
373 * only under special conditions and there is a performance hit.
374 * The re-alignment happens at these occasions for different
375 * @cra_u types: cipher -- For both input data and output data
376 * buffer; ahash -- For output hash destination buf; shash --
377 * For output hash destination buf.
378 * This is needed on hardware which is flawed by design and
379 * cannot pick data from arbitrary addresses.
380 * @cra_priority: Priority of this transformation implementation. In case
381 * multiple transformations with same @cra_name are available to
382 * the Crypto API, the kernel will use the one with highest
384 * @cra_name: Generic name (usable by multiple implementations) of the
385 * transformation algorithm. This is the name of the transformation
386 * itself. This field is used by the kernel when looking up the
387 * providers of particular transformation.
388 * @cra_driver_name: Unique name of the transformation provider. This is the
389 * name of the provider of the transformation. This can be any
390 * arbitrary value, but in the usual case, this contains the
391 * name of the chip or provider and the name of the
392 * transformation algorithm.
393 * @cra_type: Type of the cryptographic transformation. This is a pointer to
394 * struct crypto_type, which implements callbacks common for all
395 * transformation types. There are multiple options, such as
396 * &crypto_skcipher_type, &crypto_ahash_type, &crypto_rng_type.
397 * This field might be empty. In that case, there are no common
398 * callbacks. This is the case for: cipher, compress, shash.
399 * @cra_u: Callbacks implementing the transformation. This is a union of
400 * multiple structures. Depending on the type of transformation selected
401 * by @cra_type and @cra_flags above, the associated structure must be
402 * filled with callbacks. This field might be empty. This is the case
404 * @cra_init: Initialize the cryptographic transformation object. This function
405 * is used to initialize the cryptographic transformation object.
406 * This function is called only once at the instantiation time, right
407 * after the transformation context was allocated. In case the
408 * cryptographic hardware has some special requirements which need to
409 * be handled by software, this function shall check for the precise
410 * requirement of the transformation and put any software fallbacks
412 * @cra_exit: Deinitialize the cryptographic transformation object. This is a
413 * counterpart to @cra_init, used to remove various changes set in
415 * @cra_u.cipher: Union member which contains a single-block symmetric cipher
416 * definition. See @struct @cipher_alg.
417 * @cra_u.compress: Union member which contains a (de)compression algorithm.
418 * See @struct @compress_alg.
419 * @cra_module: Owner of this transformation implementation. Set to THIS_MODULE
420 * @cra_list: internally used
421 * @cra_users: internally used
422 * @cra_refcnt: internally used
423 * @cra_destroy: internally used
425 * @stats: union of all possible crypto_istat_xxx structures
426 * @stats.aead: statistics for AEAD algorithm
427 * @stats.akcipher: statistics for akcipher algorithm
428 * @stats.cipher: statistics for cipher algorithm
429 * @stats.compress: statistics for compress algorithm
430 * @stats.hash: statistics for hash algorithm
431 * @stats.rng: statistics for rng algorithm
432 * @stats.kpp: statistics for KPP algorithm
434 * The struct crypto_alg describes a generic Crypto API algorithm and is common
435 * for all of the transformations. Any variable not documented here shall not
436 * be used by a cipher implementation as it is internal to the Crypto API.
439 struct list_head cra_list;
440 struct list_head cra_users;
443 unsigned int cra_blocksize;
444 unsigned int cra_ctxsize;
445 unsigned int cra_alignmask;
448 refcount_t cra_refcnt;
450 char cra_name[CRYPTO_MAX_ALG_NAME];
451 char cra_driver_name[CRYPTO_MAX_ALG_NAME];
453 const struct crypto_type *cra_type;
456 struct cipher_alg cipher;
457 struct compress_alg compress;
460 int (*cra_init)(struct crypto_tfm *tfm);
461 void (*cra_exit)(struct crypto_tfm *tfm);
462 void (*cra_destroy)(struct crypto_alg *alg);
464 struct module *cra_module;
466 #ifdef CONFIG_CRYPTO_STATS
468 struct crypto_istat_aead aead;
469 struct crypto_istat_akcipher akcipher;
470 struct crypto_istat_cipher cipher;
471 struct crypto_istat_compress compress;
472 struct crypto_istat_hash hash;
473 struct crypto_istat_rng rng;
474 struct crypto_istat_kpp kpp;
476 #endif /* CONFIG_CRYPTO_STATS */
478 } CRYPTO_MINALIGN_ATTR;
480 #ifdef CONFIG_CRYPTO_STATS
481 void crypto_stats_init(struct crypto_alg *alg);
482 void crypto_stats_get(struct crypto_alg *alg);
483 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg, int ret);
484 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg, int ret);
485 void crypto_stats_ahash_update(unsigned int nbytes, int ret, struct crypto_alg *alg);
486 void crypto_stats_ahash_final(unsigned int nbytes, int ret, struct crypto_alg *alg);
487 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret, struct crypto_alg *alg);
488 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret, struct crypto_alg *alg);
489 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg);
490 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg);
491 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg);
492 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg);
493 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret);
494 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret);
495 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret);
496 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret);
497 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen, int ret);
498 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret, struct crypto_alg *alg);
499 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret, struct crypto_alg *alg);
501 static inline void crypto_stats_init(struct crypto_alg *alg)
503 static inline void crypto_stats_get(struct crypto_alg *alg)
505 static inline void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg, int ret)
507 static inline void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg, int ret)
509 static inline void crypto_stats_ahash_update(unsigned int nbytes, int ret, struct crypto_alg *alg)
511 static inline void crypto_stats_ahash_final(unsigned int nbytes, int ret, struct crypto_alg *alg)
513 static inline void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret, struct crypto_alg *alg)
515 static inline void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret, struct crypto_alg *alg)
517 static inline void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
519 static inline void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
521 static inline void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
523 static inline void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
525 static inline void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
527 static inline void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
529 static inline void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
531 static inline void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
533 static inline void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen, int ret)
535 static inline void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret, struct crypto_alg *alg)
537 static inline void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret, struct crypto_alg *alg)
541 * A helper struct for waiting for completion of async crypto ops
544 struct completion completion;
549 * Macro for declaring a crypto op async wait object on stack
551 #define DECLARE_CRYPTO_WAIT(_wait) \
552 struct crypto_wait _wait = { \
553 COMPLETION_INITIALIZER_ONSTACK((_wait).completion), 0 }
556 * Async ops completion helper functioons
558 void crypto_req_done(struct crypto_async_request *req, int err);
560 static inline int crypto_wait_req(int err, struct crypto_wait *wait)
565 wait_for_completion(&wait->completion);
566 reinit_completion(&wait->completion);
574 static inline void crypto_init_wait(struct crypto_wait *wait)
576 init_completion(&wait->completion);
580 * Algorithm registration interface.
582 int crypto_register_alg(struct crypto_alg *alg);
583 void crypto_unregister_alg(struct crypto_alg *alg);
584 int crypto_register_algs(struct crypto_alg *algs, int count);
585 void crypto_unregister_algs(struct crypto_alg *algs, int count);
588 * Algorithm query interface.
590 int crypto_has_alg(const char *name, u32 type, u32 mask);
593 * Transforms: user-instantiated objects which encapsulate algorithms
594 * and core processing logic. Managed via crypto_alloc_*() and
595 * crypto_free_*(), as well as the various helpers below.
602 void (*exit)(struct crypto_tfm *tfm);
604 struct crypto_alg *__crt_alg;
606 void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
609 struct crypto_cipher {
610 struct crypto_tfm base;
614 struct crypto_tfm base;
625 #define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
627 /* Maximum number of (rtattr) parameters for each template. */
628 #define CRYPTO_MAX_ATTRS 32
630 struct crypto_attr_alg {
631 char name[CRYPTO_MAX_ALG_NAME];
634 struct crypto_attr_type {
639 struct crypto_attr_u32 {
644 * Transform user interface.
647 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
648 void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);
650 static inline void crypto_free_tfm(struct crypto_tfm *tfm)
652 return crypto_destroy_tfm(tfm, tfm);
655 int alg_test(const char *driver, const char *alg, u32 type, u32 mask);
658 * Transform helpers which query the underlying algorithm.
660 static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
662 return tfm->__crt_alg->cra_name;
665 static inline const char *crypto_tfm_alg_driver_name(struct crypto_tfm *tfm)
667 return tfm->__crt_alg->cra_driver_name;
670 static inline int crypto_tfm_alg_priority(struct crypto_tfm *tfm)
672 return tfm->__crt_alg->cra_priority;
675 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
677 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
680 static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
682 return tfm->__crt_alg->cra_blocksize;
685 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
687 return tfm->__crt_alg->cra_alignmask;
690 static inline u32 crypto_tfm_get_flags(struct crypto_tfm *tfm)
692 return tfm->crt_flags;
695 static inline void crypto_tfm_set_flags(struct crypto_tfm *tfm, u32 flags)
697 tfm->crt_flags |= flags;
700 static inline void crypto_tfm_clear_flags(struct crypto_tfm *tfm, u32 flags)
702 tfm->crt_flags &= ~flags;
705 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
707 return tfm->__crt_ctx;
710 static inline unsigned int crypto_tfm_ctx_alignment(void)
712 struct crypto_tfm *tfm;
713 return __alignof__(tfm->__crt_ctx);
717 * DOC: Single Block Cipher API
719 * The single block cipher API is used with the ciphers of type
720 * CRYPTO_ALG_TYPE_CIPHER (listed as type "cipher" in /proc/crypto).
722 * Using the single block cipher API calls, operations with the basic cipher
723 * primitive can be implemented. These cipher primitives exclude any block
724 * chaining operations including IV handling.
726 * The purpose of this single block cipher API is to support the implementation
727 * of templates or other concepts that only need to perform the cipher operation
728 * on one block at a time. Templates invoke the underlying cipher primitive
729 * block-wise and process either the input or the output data of these cipher
733 static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
735 return (struct crypto_cipher *)tfm;
739 * crypto_alloc_cipher() - allocate single block cipher handle
740 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
741 * single block cipher
742 * @type: specifies the type of the cipher
743 * @mask: specifies the mask for the cipher
745 * Allocate a cipher handle for a single block cipher. The returned struct
746 * crypto_cipher is the cipher handle that is required for any subsequent API
747 * invocation for that single block cipher.
749 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
750 * of an error, PTR_ERR() returns the error code.
752 static inline struct crypto_cipher *crypto_alloc_cipher(const char *alg_name,
755 type &= ~CRYPTO_ALG_TYPE_MASK;
756 type |= CRYPTO_ALG_TYPE_CIPHER;
757 mask |= CRYPTO_ALG_TYPE_MASK;
759 return __crypto_cipher_cast(crypto_alloc_base(alg_name, type, mask));
762 static inline struct crypto_tfm *crypto_cipher_tfm(struct crypto_cipher *tfm)
768 * crypto_free_cipher() - zeroize and free the single block cipher handle
769 * @tfm: cipher handle to be freed
771 static inline void crypto_free_cipher(struct crypto_cipher *tfm)
773 crypto_free_tfm(crypto_cipher_tfm(tfm));
777 * crypto_has_cipher() - Search for the availability of a single block cipher
778 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
779 * single block cipher
780 * @type: specifies the type of the cipher
781 * @mask: specifies the mask for the cipher
783 * Return: true when the single block cipher is known to the kernel crypto API;
786 static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
788 type &= ~CRYPTO_ALG_TYPE_MASK;
789 type |= CRYPTO_ALG_TYPE_CIPHER;
790 mask |= CRYPTO_ALG_TYPE_MASK;
792 return crypto_has_alg(alg_name, type, mask);
796 * crypto_cipher_blocksize() - obtain block size for cipher
797 * @tfm: cipher handle
799 * The block size for the single block cipher referenced with the cipher handle
800 * tfm is returned. The caller may use that information to allocate appropriate
801 * memory for the data returned by the encryption or decryption operation
803 * Return: block size of cipher
805 static inline unsigned int crypto_cipher_blocksize(struct crypto_cipher *tfm)
807 return crypto_tfm_alg_blocksize(crypto_cipher_tfm(tfm));
810 static inline unsigned int crypto_cipher_alignmask(struct crypto_cipher *tfm)
812 return crypto_tfm_alg_alignmask(crypto_cipher_tfm(tfm));
815 static inline u32 crypto_cipher_get_flags(struct crypto_cipher *tfm)
817 return crypto_tfm_get_flags(crypto_cipher_tfm(tfm));
820 static inline void crypto_cipher_set_flags(struct crypto_cipher *tfm,
823 crypto_tfm_set_flags(crypto_cipher_tfm(tfm), flags);
826 static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
829 crypto_tfm_clear_flags(crypto_cipher_tfm(tfm), flags);
833 * crypto_cipher_setkey() - set key for cipher
834 * @tfm: cipher handle
835 * @key: buffer holding the key
836 * @keylen: length of the key in bytes
838 * The caller provided key is set for the single block cipher referenced by the
841 * Note, the key length determines the cipher type. Many block ciphers implement
842 * different cipher modes depending on the key size, such as AES-128 vs AES-192
843 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
846 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
848 int crypto_cipher_setkey(struct crypto_cipher *tfm,
849 const u8 *key, unsigned int keylen);
852 * crypto_cipher_encrypt_one() - encrypt one block of plaintext
853 * @tfm: cipher handle
854 * @dst: points to the buffer that will be filled with the ciphertext
855 * @src: buffer holding the plaintext to be encrypted
857 * Invoke the encryption operation of one block. The caller must ensure that
858 * the plaintext and ciphertext buffers are at least one block in size.
860 void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
861 u8 *dst, const u8 *src);
864 * crypto_cipher_decrypt_one() - decrypt one block of ciphertext
865 * @tfm: cipher handle
866 * @dst: points to the buffer that will be filled with the plaintext
867 * @src: buffer holding the ciphertext to be decrypted
869 * Invoke the decryption operation of one block. The caller must ensure that
870 * the plaintext and ciphertext buffers are at least one block in size.
872 void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
873 u8 *dst, const u8 *src);
875 static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
877 return (struct crypto_comp *)tfm;
880 static inline struct crypto_comp *crypto_alloc_comp(const char *alg_name,
883 type &= ~CRYPTO_ALG_TYPE_MASK;
884 type |= CRYPTO_ALG_TYPE_COMPRESS;
885 mask |= CRYPTO_ALG_TYPE_MASK;
887 return __crypto_comp_cast(crypto_alloc_base(alg_name, type, mask));
890 static inline struct crypto_tfm *crypto_comp_tfm(struct crypto_comp *tfm)
895 static inline void crypto_free_comp(struct crypto_comp *tfm)
897 crypto_free_tfm(crypto_comp_tfm(tfm));
900 static inline int crypto_has_comp(const char *alg_name, u32 type, u32 mask)
902 type &= ~CRYPTO_ALG_TYPE_MASK;
903 type |= CRYPTO_ALG_TYPE_COMPRESS;
904 mask |= CRYPTO_ALG_TYPE_MASK;
906 return crypto_has_alg(alg_name, type, mask);
909 static inline const char *crypto_comp_name(struct crypto_comp *tfm)
911 return crypto_tfm_alg_name(crypto_comp_tfm(tfm));
914 int crypto_comp_compress(struct crypto_comp *tfm,
915 const u8 *src, unsigned int slen,
916 u8 *dst, unsigned int *dlen);
918 int crypto_comp_decompress(struct crypto_comp *tfm,
919 const u8 *src, unsigned int slen,
920 u8 *dst, unsigned int *dlen);
922 #endif /* _LINUX_CRYPTO_H */