2 /* $OpenBSD: cryptodev.h,v 1.31 2002/06/11 11:14:29 beck Exp $ */
5 * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
6 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
8 * This code was written by Angelos D. Keromytis in Athens, Greece, in
9 * February 2000. Network Security Technologies Inc. (NSTI) kindly
10 * supported the development of this code.
12 * Copyright (c) 2000 Angelos D. Keromytis
14 * Permission to use, copy, and modify this software with or without fee
15 * is hereby granted, provided that this entire notice is included in
16 * all source code copies of any software which is or includes a copy or
17 * modification of this software.
19 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
20 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
21 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
22 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
25 * Copyright (c) 2001 Theo de Raadt
26 * Copyright (c) 2014 The FreeBSD Foundation
27 * All rights reserved.
29 * Portions of this software were developed by John-Mark Gurney
30 * under sponsorship of the FreeBSD Foundation and
31 * Rubicon Communications, LLC (Netgate).
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. The name of the author may not be used to endorse or promote products
43 * derived from this software without specific prior written permission.
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
48 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
49 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
54 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 * Effort sponsored in part by the Defense Advanced Research Projects
57 * Agency (DARPA) and Air Force Research Laboratory, Air Force
58 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
62 #ifndef _CRYPTO_CRYPTO_H_
63 #define _CRYPTO_CRYPTO_H_
65 #include <sys/ioccom.h>
66 #include <sys/_task.h>
69 #include <opencrypto/_cryptodev.h>
72 /* Some initial values */
73 #define CRYPTO_DRIVERS_INITIAL 4
74 #define CRYPTO_SW_SESSIONS 32
77 #define NULL_HASH_LEN 16
78 #define MD5_HASH_LEN 16
79 #define SHA1_HASH_LEN 20
80 #define RIPEMD160_HASH_LEN 20
81 #define SHA2_224_HASH_LEN 28
82 #define SHA2_256_HASH_LEN 32
83 #define SHA2_384_HASH_LEN 48
84 #define SHA2_512_HASH_LEN 64
85 #define MD5_KPDK_HASH_LEN 16
86 #define SHA1_KPDK_HASH_LEN 20
87 #define AES_GMAC_HASH_LEN 16
88 /* Maximum hash algorithm result length */
89 #define HASH_MAX_LEN SHA2_512_HASH_LEN /* Keep this updated */
91 #define MD5_BLOCK_LEN 64
92 #define SHA1_BLOCK_LEN 64
93 #define RIPEMD160_BLOCK_LEN 64
94 #define SHA2_224_BLOCK_LEN 64
95 #define SHA2_256_BLOCK_LEN 64
96 #define SHA2_384_BLOCK_LEN 128
97 #define SHA2_512_BLOCK_LEN 128
100 #define NULL_HMAC_BLOCK_LEN 64
101 /* Maximum HMAC block length */
102 #define HMAC_MAX_BLOCK_LEN SHA2_512_BLOCK_LEN /* Keep this updated */
103 #define HMAC_IPAD_VAL 0x36
104 #define HMAC_OPAD_VAL 0x5C
105 /* HMAC Key Length */
106 #define AES_128_GMAC_KEY_LEN 16
107 #define AES_192_GMAC_KEY_LEN 24
108 #define AES_256_GMAC_KEY_LEN 32
110 /* Encryption algorithm block sizes */
111 #define NULL_BLOCK_LEN 4 /* IPsec to maintain alignment */
112 #define DES_BLOCK_LEN 8
113 #define DES3_BLOCK_LEN 8
114 #define BLOWFISH_BLOCK_LEN 8
115 #define SKIPJACK_BLOCK_LEN 8
116 #define CAST128_BLOCK_LEN 8
117 #define RIJNDAEL128_BLOCK_LEN 16
118 #define AES_BLOCK_LEN 16
119 #define AES_ICM_BLOCK_LEN 1
120 #define ARC4_BLOCK_LEN 1
121 #define CAMELLIA_BLOCK_LEN 16
122 #define CHACHA20_NATIVE_BLOCK_LEN 64
123 #define EALG_MAX_BLOCK_LEN CHACHA20_NATIVE_BLOCK_LEN /* Keep this updated */
127 #define ARC4_IV_LEN 1
128 #define AES_GCM_IV_LEN 12
129 #define AES_XTS_IV_LEN 8
130 #define AES_XTS_ALPHA 0x87 /* GF(2^128) generator polynomial */
132 /* Min and Max Encryption Key Sizes */
133 #define NULL_MIN_KEY 0
134 #define NULL_MAX_KEY 256 /* 2048 bits, max key */
135 #define DES_MIN_KEY 8
136 #define DES_MAX_KEY DES_MIN_KEY
137 #define TRIPLE_DES_MIN_KEY 24
138 #define TRIPLE_DES_MAX_KEY TRIPLE_DES_MIN_KEY
139 #define BLOWFISH_MIN_KEY 5
140 #define BLOWFISH_MAX_KEY 56 /* 448 bits, max key */
141 #define CAST_MIN_KEY 5
142 #define CAST_MAX_KEY 16
143 #define SKIPJACK_MIN_KEY 10
144 #define SKIPJACK_MAX_KEY SKIPJACK_MIN_KEY
145 #define RIJNDAEL_MIN_KEY 16
146 #define RIJNDAEL_MAX_KEY 32
147 #define AES_MIN_KEY RIJNDAEL_MIN_KEY
148 #define AES_MAX_KEY RIJNDAEL_MAX_KEY
149 #define AES_XTS_MIN_KEY (2 * AES_MIN_KEY)
150 #define AES_XTS_MAX_KEY (2 * AES_MAX_KEY)
151 #define ARC4_MIN_KEY 1
152 #define ARC4_MAX_KEY 32
153 #define CAMELLIA_MIN_KEY 8
154 #define CAMELLIA_MAX_KEY 32
156 /* Maximum hash algorithm result length */
157 #define AALG_MAX_RESULT_LEN 64 /* Keep this updated */
159 #define CRYPTO_ALGORITHM_MIN 1
160 #define CRYPTO_DES_CBC 1
161 #define CRYPTO_3DES_CBC 2
162 #define CRYPTO_BLF_CBC 3
163 #define CRYPTO_CAST_CBC 4
164 #define CRYPTO_SKIPJACK_CBC 5
165 #define CRYPTO_MD5_HMAC 6
166 #define CRYPTO_SHA1_HMAC 7
167 #define CRYPTO_RIPEMD160_HMAC 8
168 #define CRYPTO_MD5_KPDK 9
169 #define CRYPTO_SHA1_KPDK 10
170 #define CRYPTO_RIJNDAEL128_CBC 11 /* 128 bit blocksize */
171 #define CRYPTO_AES_CBC 11 /* 128 bit blocksize -- the same as above */
172 #define CRYPTO_ARC4 12
173 #define CRYPTO_MD5 13
174 #define CRYPTO_SHA1 14
175 #define CRYPTO_NULL_HMAC 15
176 #define CRYPTO_NULL_CBC 16
177 #define CRYPTO_DEFLATE_COMP 17 /* Deflate compression algorithm */
178 #define CRYPTO_SHA2_256_HMAC 18
179 #define CRYPTO_SHA2_384_HMAC 19
180 #define CRYPTO_SHA2_512_HMAC 20
181 #define CRYPTO_CAMELLIA_CBC 21
182 #define CRYPTO_AES_XTS 22
183 #define CRYPTO_AES_ICM 23 /* commonly known as CTR mode */
184 #define CRYPTO_AES_NIST_GMAC 24 /* cipher side */
185 #define CRYPTO_AES_NIST_GCM_16 25 /* 16 byte ICV */
186 #define CRYPTO_AES_128_NIST_GMAC 26 /* auth side */
187 #define CRYPTO_AES_192_NIST_GMAC 27 /* auth side */
188 #define CRYPTO_AES_256_NIST_GMAC 28 /* auth side */
189 #define CRYPTO_BLAKE2B 29 /* Blake2b hash */
190 #define CRYPTO_BLAKE2S 30 /* Blake2s hash */
191 #define CRYPTO_CHACHA20 31 /* Chacha20 stream cipher */
192 #define CRYPTO_SHA2_224_HMAC 32
193 #define CRYPTO_RIPEMD160 33
194 #define CRYPTO_SHA2_224 34
195 #define CRYPTO_SHA2_256 35
196 #define CRYPTO_SHA2_384 36
197 #define CRYPTO_SHA2_512 37
198 #define CRYPTO_ALGORITHM_MAX 37 /* Keep updated - see below */
200 #define CRYPTO_ALGO_VALID(x) ((x) >= CRYPTO_ALGORITHM_MIN && \
201 (x) <= CRYPTO_ALGORITHM_MAX)
203 /* Algorithm flags */
204 #define CRYPTO_ALG_FLAG_SUPPORTED 0x01 /* Algorithm is supported */
205 #define CRYPTO_ALG_FLAG_RNG_ENABLE 0x02 /* Has HW RNG for DH/DSA */
206 #define CRYPTO_ALG_FLAG_DSA_SHA 0x04 /* Can do SHA on msg */
209 * Crypto driver/device flags. They can set in the crid
210 * parameter when creating a session or submitting a key
211 * op to affect the device/driver assigned. If neither
212 * of these are specified then the crid is assumed to hold
213 * the driver id of an existing (and suitable) device that
214 * must be used to satisfy the request.
216 #define CRYPTO_FLAG_HARDWARE 0x01000000 /* hardware accelerated */
217 #define CRYPTO_FLAG_SOFTWARE 0x02000000 /* software implementation */
221 u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
222 u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
224 u_int32_t keylen; /* cipher key */
226 int mackeylen; /* mac key */
229 u_int32_t ses; /* returns: session # */
233 * session and crypt _op structs are used by userspace programs to interact
234 * with /dev/crypto. Confusingly, the internal kernel interface is named
235 * "cryptop" (no underscore).
238 u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
239 u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
241 u_int32_t keylen; /* cipher key */
243 int mackeylen; /* mac key */
246 u_int32_t ses; /* returns: session # */
247 int crid; /* driver id + flags (rw) */
248 int pad[4]; /* for future expansion */
253 u_int16_t op; /* i.e. COP_ENCRYPT */
254 #define COP_ENCRYPT 1
255 #define COP_DECRYPT 2
257 #define COP_F_CIPHER_FIRST 0x0001 /* Cipher before MAC. */
258 #define COP_F_BATCH 0x0008 /* Batch op if possible */
260 c_caddr_t src; /* become iov[] inside kernel */
262 caddr_t mac; /* must be big enough for chosen MAC */
266 /* op and flags the same as crypt_op */
269 u_int16_t op; /* i.e. COP_ENCRYPT */
274 c_caddr_t src; /* become iov[] inside kernel */
276 c_caddr_t aad; /* additional authenticated data */
277 caddr_t tag; /* must fit for chosen TAG length */
282 * Parameters for looking up a crypto driver/device by
283 * device name or by id. The latter are returned for
284 * created sessions (crid) and completed key operations.
286 struct crypt_find_op {
287 int crid; /* driver id + flags */
288 char name[32]; /* device/driver name */
291 /* bignum parameter, in packed bytes, ... */
297 #define CRK_MAXPARAM 8
300 u_int crk_op; /* ie. CRK_MOD_EXP or other */
301 u_int crk_status; /* return status */
302 u_short crk_iparams; /* # of input parameters */
303 u_short crk_oparams; /* # of output parameters */
304 u_int crk_crid; /* NB: only used by CIOCKEY2 (rw) */
305 struct crparam crk_param[CRK_MAXPARAM];
307 #define CRK_ALGORITM_MIN 0
308 #define CRK_MOD_EXP 0
309 #define CRK_MOD_EXP_CRT 1
310 #define CRK_DSA_SIGN 2
311 #define CRK_DSA_VERIFY 3
312 #define CRK_DH_COMPUTE_KEY 4
313 #define CRK_ALGORITHM_MAX 4 /* Keep updated - see below */
315 #define CRF_MOD_EXP (1 << CRK_MOD_EXP)
316 #define CRF_MOD_EXP_CRT (1 << CRK_MOD_EXP_CRT)
317 #define CRF_DSA_SIGN (1 << CRK_DSA_SIGN)
318 #define CRF_DSA_VERIFY (1 << CRK_DSA_VERIFY)
319 #define CRF_DH_COMPUTE_KEY (1 << CRK_DH_COMPUTE_KEY)
322 * done against open of /dev/crypto, to get a cloned descriptor.
323 * Please use F_SETFD against the cloned descriptor.
325 #define CRIOGET _IOWR('c', 100, u_int32_t)
326 #define CRIOASYMFEAT CIOCASYMFEAT
327 #define CRIOFINDDEV CIOCFINDDEV
329 /* the following are done against the cloned descriptor */
330 #define CIOCGSESSION _IOWR('c', 101, struct session_op)
331 #define CIOCFSESSION _IOW('c', 102, u_int32_t)
332 #define CIOCCRYPT _IOWR('c', 103, struct crypt_op)
333 #define CIOCKEY _IOWR('c', 104, struct crypt_kop)
334 #define CIOCASYMFEAT _IOR('c', 105, u_int32_t)
335 #define CIOCGSESSION2 _IOWR('c', 106, struct session2_op)
336 #define CIOCKEY2 _IOWR('c', 107, struct crypt_kop)
337 #define CIOCFINDDEV _IOWR('c', 108, struct crypt_find_op)
338 #define CIOCCRYPTAEAD _IOWR('c', 109, struct crypt_aead)
341 struct timespec acc; /* total accumulated time */
342 struct timespec min; /* min time */
343 struct timespec max; /* max time */
344 u_int32_t count; /* number of observations */
348 u_int32_t cs_ops; /* symmetric crypto ops submitted */
349 u_int32_t cs_errs; /* symmetric crypto ops that failed */
350 u_int32_t cs_kops; /* asymetric/key ops submitted */
351 u_int32_t cs_kerrs; /* asymetric/key ops that failed */
352 u_int32_t cs_intrs; /* crypto swi thread activations */
353 u_int32_t cs_rets; /* crypto return thread activations */
354 u_int32_t cs_blocks; /* symmetric op driver block */
355 u_int32_t cs_kblocks; /* symmetric op driver block */
357 * When CRYPTO_TIMING is defined at compile time and the
358 * sysctl debug.crypto is set to 1, the crypto system will
359 * accumulate statistics about how long it takes to process
360 * crypto requests at various points during processing.
362 struct cryptotstat cs_invoke; /* crypto_dipsatch -> crypto_invoke */
363 struct cryptotstat cs_done; /* crypto_invoke -> crypto_done */
364 struct cryptotstat cs_cb; /* crypto_done -> callback */
365 struct cryptotstat cs_finis; /* callback -> callback return */
371 #define CRYPTDEB(s, ...) do { \
372 printf("%s:%d: " s "\n", __FILE__, __LINE__, ## __VA_ARGS__); \
375 #define CRYPTDEB(...) do { } while (0)
378 /* Standard initialization structure beginning */
380 int cri_alg; /* Algorithm to use */
381 int cri_klen; /* Key length, in bits */
382 int cri_mlen; /* Number of bytes we want from the
383 entire hash. 0 means all. */
384 caddr_t cri_key; /* key to use */
385 u_int8_t cri_iv[EALG_MAX_BLOCK_LEN]; /* IV to use */
386 struct cryptoini *cri_next;
389 /* Describe boundaries of a single crypto operation */
391 int crd_skip; /* How many bytes to ignore from start */
392 int crd_len; /* How many bytes to process */
393 int crd_inject; /* Where to inject results, if applicable */
396 #define CRD_F_ENCRYPT 0x01 /* Set when doing encryption */
397 #define CRD_F_IV_PRESENT 0x02 /* When encrypting, IV is already in
398 place, so don't copy. */
399 #define CRD_F_IV_EXPLICIT 0x04 /* IV explicitly provided */
400 #define CRD_F_DSA_SHA_NEEDED 0x08 /* Compute SHA-1 of buffer for DSA */
401 #define CRD_F_COMP 0x0f /* Set when doing compression */
402 #define CRD_F_KEY_EXPLICIT 0x10 /* Key explicitly provided */
404 struct cryptoini CRD_INI; /* Initialization/context data */
405 #define crd_esn CRD_INI.cri_esn
406 #define crd_iv CRD_INI.cri_iv
407 #define crd_key CRD_INI.cri_key
408 #define crd_alg CRD_INI.cri_alg
409 #define crd_klen CRD_INI.cri_klen
411 struct cryptodesc *crd_next;
414 /* Structure describing complete operation */
416 TAILQ_ENTRY(cryptop) crp_next;
418 struct task crp_task;
420 crypto_session_t crp_session; /* Session */
421 int crp_ilen; /* Input data total length */
422 int crp_olen; /* Result total length */
425 * Error type (zero means no error).
426 * All error codes except EAGAIN
427 * indicate possible data corruption (as in,
428 * the data have been touched). On all
429 * errors, the crp_session may have changed
430 * (reset to a new one), so the caller
431 * should always check and use the new
432 * value on future requests.
436 #define CRYPTO_F_IMBUF 0x0001 /* Input/output are mbuf chains */
437 #define CRYPTO_F_IOV 0x0002 /* Input/output are uio */
438 #define CRYPTO_F_BATCH 0x0008 /* Batch op if possible */
439 #define CRYPTO_F_CBIMM 0x0010 /* Do callback immediately */
440 #define CRYPTO_F_DONE 0x0020 /* Operation completed */
441 #define CRYPTO_F_CBIFSYNC 0x0040 /* Do CBIMM if op is synchronous */
442 #define CRYPTO_F_ASYNC 0x0080 /* Dispatch crypto jobs on several threads
443 * if op is synchronous
445 #define CRYPTO_F_ASYNC_KEEPORDER 0x0100 /*
446 * Dispatch the crypto jobs in the same
447 * order there are submitted. Applied only
448 * if CRYPTO_F_ASYNC flags is set
452 caddr_t crp_buf; /* Data to be processed */
453 struct mbuf *crp_mbuf;
456 void * crp_opaque; /* Opaque pointer, passed along */
457 struct cryptodesc *crp_desc; /* Linked list of processing descriptors */
459 int (*crp_callback)(struct cryptop *); /* Callback function */
461 struct bintime crp_tstamp; /* performance time stamp */
462 uint32_t crp_seq; /* used for ordered dispatch */
463 uint32_t crp_retw_id; /*
464 * the return worker to be used,
465 * used for ordered dispatch
469 #define CRYPTOP_ASYNC(crp) \
470 (((crp)->crp_flags & CRYPTO_F_ASYNC) && \
471 crypto_ses2caps((crp)->crp_session) & CRYPTOCAP_F_SYNC)
472 #define CRYPTOP_ASYNC_KEEPORDER(crp) \
473 (CRYPTOP_ASYNC(crp) && \
474 (crp)->crp_flags & CRYPTO_F_ASYNC_KEEPORDER)
476 #define CRYPTO_BUF_CONTIG 0x0
477 #define CRYPTO_BUF_IOV 0x1
478 #define CRYPTO_BUF_MBUF 0x2
480 #define CRYPTO_OP_DECRYPT 0x0
481 #define CRYPTO_OP_ENCRYPT 0x1
484 * Hints passed to process methods.
486 #define CRYPTO_HINT_MORE 0x1 /* more ops coming shortly */
489 TAILQ_ENTRY(cryptkop) krp_next;
491 u_int krp_op; /* ie. CRK_MOD_EXP or other */
492 u_int krp_status; /* return status */
493 u_short krp_iparams; /* # of input parameters */
494 u_short krp_oparams; /* # of output parameters */
495 u_int krp_crid; /* desired device, etc. */
497 struct crparam krp_param[CRK_MAXPARAM]; /* kvm */
498 int (*krp_callback)(struct cryptkop *);
501 uint32_t crypto_ses2hid(crypto_session_t crypto_session);
502 uint32_t crypto_ses2caps(crypto_session_t crypto_session);
503 void *crypto_get_driver_session(crypto_session_t crypto_session);
505 MALLOC_DECLARE(M_CRYPTO_DATA);
507 extern int crypto_newsession(crypto_session_t *cses, struct cryptoini *cri, int hard);
508 extern void crypto_freesession(crypto_session_t cses);
509 #define CRYPTOCAP_F_HARDWARE CRYPTO_FLAG_HARDWARE
510 #define CRYPTOCAP_F_SOFTWARE CRYPTO_FLAG_SOFTWARE
511 #define CRYPTOCAP_F_SYNC 0x04000000 /* operates synchronously */
512 extern int32_t crypto_get_driverid(device_t dev, size_t session_size,
514 extern int crypto_find_driver(const char *);
515 extern device_t crypto_find_device_byhid(int hid);
516 extern int crypto_getcaps(int hid);
517 extern int crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
519 extern int crypto_kregister(u_int32_t, int, u_int32_t);
520 extern int crypto_unregister(u_int32_t driverid, int alg);
521 extern int crypto_unregister_all(u_int32_t driverid);
522 extern int crypto_dispatch(struct cryptop *crp);
523 extern int crypto_kdispatch(struct cryptkop *);
524 #define CRYPTO_SYMQ 0x1
525 #define CRYPTO_ASYMQ 0x2
526 extern int crypto_unblock(u_int32_t, int);
527 extern void crypto_done(struct cryptop *crp);
528 extern void crypto_kdone(struct cryptkop *);
529 extern int crypto_getfeat(int *);
531 extern void crypto_freereq(struct cryptop *crp);
532 extern struct cryptop *crypto_getreq(int num);
534 extern int crypto_usercrypto; /* userland may do crypto requests */
535 extern int crypto_userasymcrypto; /* userland may do asym crypto reqs */
536 extern int crypto_devallowsoft; /* only use hardware crypto */
539 * Crypto-related utility routines used mainly by drivers.
541 * XXX these don't really belong here; but for now they're
542 * kept apart from the rest of the system.
545 extern void cuio_copydata(struct uio* uio, int off, int len, caddr_t cp);
546 extern void cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp);
547 extern int cuio_getptr(struct uio *uio, int loc, int *off);
548 extern int cuio_apply(struct uio *uio, int off, int len,
549 int (*f)(void *, void *, u_int), void *arg);
553 extern int crypto_mbuftoiov(struct mbuf *mbuf, struct iovec **iovptr,
554 int *cnt, int *allocated);
556 extern void crypto_copyback(int flags, caddr_t buf, int off, int size,
558 extern void crypto_copydata(int flags, caddr_t buf, int off, int size,
560 extern int crypto_apply(int flags, caddr_t buf, int off, int len,
561 int (*f)(void *, void *, u_int), void *arg);
564 #endif /* _CRYPTO_CRYPTO_H_ */