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>
68 /* Some initial values */
69 #define CRYPTO_DRIVERS_INITIAL 4
70 #define CRYPTO_SW_SESSIONS 32
73 #define NULL_HASH_LEN 16
74 #define MD5_HASH_LEN 16
75 #define SHA1_HASH_LEN 20
76 #define RIPEMD160_HASH_LEN 20
77 #define SHA2_256_HASH_LEN 32
78 #define SHA2_384_HASH_LEN 48
79 #define SHA2_512_HASH_LEN 64
80 #define MD5_KPDK_HASH_LEN 16
81 #define SHA1_KPDK_HASH_LEN 20
82 #define AES_GMAC_HASH_LEN 16
83 /* Maximum hash algorithm result length */
84 #define HASH_MAX_LEN SHA2_512_HASH_LEN /* Keep this updated */
87 #define NULL_HMAC_BLOCK_LEN 64
88 #define MD5_HMAC_BLOCK_LEN 64
89 #define SHA1_HMAC_BLOCK_LEN 64
90 #define RIPEMD160_HMAC_BLOCK_LEN 64
91 #define SHA2_256_HMAC_BLOCK_LEN 64
92 #define SHA2_384_HMAC_BLOCK_LEN 128
93 #define SHA2_512_HMAC_BLOCK_LEN 128
94 /* Maximum HMAC block length */
95 #define HMAC_MAX_BLOCK_LEN SHA2_512_HMAC_BLOCK_LEN /* Keep this updated */
96 #define HMAC_IPAD_VAL 0x36
97 #define HMAC_OPAD_VAL 0x5C
99 #define AES_128_GMAC_KEY_LEN 16
100 #define AES_192_GMAC_KEY_LEN 24
101 #define AES_256_GMAC_KEY_LEN 32
103 /* Encryption algorithm block sizes */
104 #define NULL_BLOCK_LEN 4 /* IPsec to maintain alignment */
105 #define DES_BLOCK_LEN 8
106 #define DES3_BLOCK_LEN 8
107 #define BLOWFISH_BLOCK_LEN 8
108 #define SKIPJACK_BLOCK_LEN 8
109 #define CAST128_BLOCK_LEN 8
110 #define RIJNDAEL128_BLOCK_LEN 16
111 #define AES_BLOCK_LEN 16
112 #define AES_ICM_BLOCK_LEN 1
113 #define ARC4_BLOCK_LEN 1
114 #define CAMELLIA_BLOCK_LEN 16
115 #define CHACHA20_NATIVE_BLOCK_LEN 64
116 #define EALG_MAX_BLOCK_LEN CHACHA20_NATIVE_BLOCK_LEN /* Keep this updated */
120 #define ARC4_IV_LEN 1
121 #define AES_GCM_IV_LEN 12
122 #define AES_XTS_IV_LEN 8
123 #define AES_XTS_ALPHA 0x87 /* GF(2^128) generator polynomial */
125 /* Min and Max Encryption Key Sizes */
126 #define NULL_MIN_KEY 0
127 #define NULL_MAX_KEY 256 /* 2048 bits, max key */
128 #define DES_MIN_KEY 8
129 #define DES_MAX_KEY DES_MIN_KEY
130 #define TRIPLE_DES_MIN_KEY 24
131 #define TRIPLE_DES_MAX_KEY TRIPLE_DES_MIN_KEY
132 #define BLOWFISH_MIN_KEY 5
133 #define BLOWFISH_MAX_KEY 56 /* 448 bits, max key */
134 #define CAST_MIN_KEY 5
135 #define CAST_MAX_KEY 16
136 #define SKIPJACK_MIN_KEY 10
137 #define SKIPJACK_MAX_KEY SKIPJACK_MIN_KEY
138 #define RIJNDAEL_MIN_KEY 16
139 #define RIJNDAEL_MAX_KEY 32
140 #define AES_MIN_KEY RIJNDAEL_MIN_KEY
141 #define AES_MAX_KEY RIJNDAEL_MAX_KEY
142 #define AES_XTS_MIN_KEY (2 * AES_MIN_KEY)
143 #define AES_XTS_MAX_KEY (2 * AES_MAX_KEY)
144 #define ARC4_MIN_KEY 1
145 #define ARC4_MAX_KEY 32
146 #define CAMELLIA_MIN_KEY 8
147 #define CAMELLIA_MAX_KEY 32
149 /* Maximum hash algorithm result length */
150 #define AALG_MAX_RESULT_LEN 64 /* Keep this updated */
152 #define CRYPTO_ALGORITHM_MIN 1
153 #define CRYPTO_DES_CBC 1
154 #define CRYPTO_3DES_CBC 2
155 #define CRYPTO_BLF_CBC 3
156 #define CRYPTO_CAST_CBC 4
157 #define CRYPTO_SKIPJACK_CBC 5
158 #define CRYPTO_MD5_HMAC 6
159 #define CRYPTO_SHA1_HMAC 7
160 #define CRYPTO_RIPEMD160_HMAC 8
161 #define CRYPTO_MD5_KPDK 9
162 #define CRYPTO_SHA1_KPDK 10
163 #define CRYPTO_RIJNDAEL128_CBC 11 /* 128 bit blocksize */
164 #define CRYPTO_AES_CBC 11 /* 128 bit blocksize -- the same as above */
165 #define CRYPTO_ARC4 12
166 #define CRYPTO_MD5 13
167 #define CRYPTO_SHA1 14
168 #define CRYPTO_NULL_HMAC 15
169 #define CRYPTO_NULL_CBC 16
170 #define CRYPTO_DEFLATE_COMP 17 /* Deflate compression algorithm */
171 #define CRYPTO_SHA2_256_HMAC 18
172 #define CRYPTO_SHA2_384_HMAC 19
173 #define CRYPTO_SHA2_512_HMAC 20
174 #define CRYPTO_CAMELLIA_CBC 21
175 #define CRYPTO_AES_XTS 22
176 #define CRYPTO_AES_ICM 23 /* commonly known as CTR mode */
177 #define CRYPTO_AES_NIST_GMAC 24 /* cipher side */
178 #define CRYPTO_AES_NIST_GCM_16 25 /* 16 byte ICV */
179 #define CRYPTO_AES_128_NIST_GMAC 26 /* auth side */
180 #define CRYPTO_AES_192_NIST_GMAC 27 /* auth side */
181 #define CRYPTO_AES_256_NIST_GMAC 28 /* auth side */
182 #define CRYPTO_BLAKE2B 29 /* Blake2b hash */
183 #define CRYPTO_BLAKE2S 30 /* Blake2s hash */
184 #define CRYPTO_CHACHA20 31 /* Chacha20 stream cipher */
185 #define CRYPTO_ALGORITHM_MAX 31 /* Keep updated - see below */
187 #define CRYPTO_ALGO_VALID(x) ((x) >= CRYPTO_ALGORITHM_MIN && \
188 (x) <= CRYPTO_ALGORITHM_MAX)
190 /* Algorithm flags */
191 #define CRYPTO_ALG_FLAG_SUPPORTED 0x01 /* Algorithm is supported */
192 #define CRYPTO_ALG_FLAG_RNG_ENABLE 0x02 /* Has HW RNG for DH/DSA */
193 #define CRYPTO_ALG_FLAG_DSA_SHA 0x04 /* Can do SHA on msg */
196 * Crypto driver/device flags. They can set in the crid
197 * parameter when creating a session or submitting a key
198 * op to affect the device/driver assigned. If neither
199 * of these are specified then the crid is assumed to hold
200 * the driver id of an existing (and suitable) device that
201 * must be used to satisfy the request.
203 #define CRYPTO_FLAG_HARDWARE 0x01000000 /* hardware accelerated */
204 #define CRYPTO_FLAG_SOFTWARE 0x02000000 /* software implementation */
208 u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
209 u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
211 u_int32_t keylen; /* cipher key */
213 int mackeylen; /* mac key */
216 u_int32_t ses; /* returns: session # */
220 u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
221 u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
223 u_int32_t keylen; /* cipher key */
225 int mackeylen; /* mac key */
228 u_int32_t ses; /* returns: session # */
229 int crid; /* driver id + flags (rw) */
230 int pad[4]; /* for future expansion */
235 u_int16_t op; /* i.e. COP_ENCRYPT */
236 #define COP_ENCRYPT 1
237 #define COP_DECRYPT 2
239 #define COP_F_CIPHER_FIRST 0x0001 /* Cipher before MAC. */
240 #define COP_F_BATCH 0x0008 /* Batch op if possible */
242 c_caddr_t src; /* become iov[] inside kernel */
244 caddr_t mac; /* must be big enough for chosen MAC */
248 /* op and flags the same as crypt_op */
251 u_int16_t op; /* i.e. COP_ENCRYPT */
256 c_caddr_t src; /* become iov[] inside kernel */
258 c_caddr_t aad; /* additional authenticated data */
259 caddr_t tag; /* must fit for chosen TAG length */
264 * Parameters for looking up a crypto driver/device by
265 * device name or by id. The latter are returned for
266 * created sessions (crid) and completed key operations.
268 struct crypt_find_op {
269 int crid; /* driver id + flags */
270 char name[32]; /* device/driver name */
273 /* bignum parameter, in packed bytes, ... */
279 #define CRK_MAXPARAM 8
282 u_int crk_op; /* ie. CRK_MOD_EXP or other */
283 u_int crk_status; /* return status */
284 u_short crk_iparams; /* # of input parameters */
285 u_short crk_oparams; /* # of output parameters */
286 u_int crk_crid; /* NB: only used by CIOCKEY2 (rw) */
287 struct crparam crk_param[CRK_MAXPARAM];
289 #define CRK_ALGORITM_MIN 0
290 #define CRK_MOD_EXP 0
291 #define CRK_MOD_EXP_CRT 1
292 #define CRK_DSA_SIGN 2
293 #define CRK_DSA_VERIFY 3
294 #define CRK_DH_COMPUTE_KEY 4
295 #define CRK_ALGORITHM_MAX 4 /* Keep updated - see below */
297 #define CRF_MOD_EXP (1 << CRK_MOD_EXP)
298 #define CRF_MOD_EXP_CRT (1 << CRK_MOD_EXP_CRT)
299 #define CRF_DSA_SIGN (1 << CRK_DSA_SIGN)
300 #define CRF_DSA_VERIFY (1 << CRK_DSA_VERIFY)
301 #define CRF_DH_COMPUTE_KEY (1 << CRK_DH_COMPUTE_KEY)
304 * done against open of /dev/crypto, to get a cloned descriptor.
305 * Please use F_SETFD against the cloned descriptor.
307 #define CRIOGET _IOWR('c', 100, u_int32_t)
308 #define CRIOASYMFEAT CIOCASYMFEAT
309 #define CRIOFINDDEV CIOCFINDDEV
311 /* the following are done against the cloned descriptor */
312 #define CIOCGSESSION _IOWR('c', 101, struct session_op)
313 #define CIOCFSESSION _IOW('c', 102, u_int32_t)
314 #define CIOCCRYPT _IOWR('c', 103, struct crypt_op)
315 #define CIOCKEY _IOWR('c', 104, struct crypt_kop)
316 #define CIOCASYMFEAT _IOR('c', 105, u_int32_t)
317 #define CIOCGSESSION2 _IOWR('c', 106, struct session2_op)
318 #define CIOCKEY2 _IOWR('c', 107, struct crypt_kop)
319 #define CIOCFINDDEV _IOWR('c', 108, struct crypt_find_op)
320 #define CIOCCRYPTAEAD _IOWR('c', 109, struct crypt_aead)
323 struct timespec acc; /* total accumulated time */
324 struct timespec min; /* min time */
325 struct timespec max; /* max time */
326 u_int32_t count; /* number of observations */
330 u_int32_t cs_ops; /* symmetric crypto ops submitted */
331 u_int32_t cs_errs; /* symmetric crypto ops that failed */
332 u_int32_t cs_kops; /* asymetric/key ops submitted */
333 u_int32_t cs_kerrs; /* asymetric/key ops that failed */
334 u_int32_t cs_intrs; /* crypto swi thread activations */
335 u_int32_t cs_rets; /* crypto return thread activations */
336 u_int32_t cs_blocks; /* symmetric op driver block */
337 u_int32_t cs_kblocks; /* symmetric op driver block */
339 * When CRYPTO_TIMING is defined at compile time and the
340 * sysctl debug.crypto is set to 1, the crypto system will
341 * accumulate statistics about how long it takes to process
342 * crypto requests at various points during processing.
344 struct cryptotstat cs_invoke; /* crypto_dipsatch -> crypto_invoke */
345 struct cryptotstat cs_done; /* crypto_invoke -> crypto_done */
346 struct cryptotstat cs_cb; /* crypto_done -> callback */
347 struct cryptotstat cs_finis; /* callback -> callback return */
353 #define CRYPTDEB(s, ...) do { \
354 printf("%s:%d: " s "\n", __FILE__, __LINE__, ## __VA_ARGS__); \
357 #define CRYPTDEB(...) do { } while (0)
360 /* Standard initialization structure beginning */
362 int cri_alg; /* Algorithm to use */
363 int cri_klen; /* Key length, in bits */
364 int cri_mlen; /* Number of bytes we want from the
365 entire hash. 0 means all. */
366 caddr_t cri_key; /* key to use */
367 u_int8_t cri_iv[EALG_MAX_BLOCK_LEN]; /* IV to use */
368 struct cryptoini *cri_next;
371 /* Describe boundaries of a single crypto operation */
373 int crd_skip; /* How many bytes to ignore from start */
374 int crd_len; /* How many bytes to process */
375 int crd_inject; /* Where to inject results, if applicable */
378 #define CRD_F_ENCRYPT 0x01 /* Set when doing encryption */
379 #define CRD_F_IV_PRESENT 0x02 /* When encrypting, IV is already in
380 place, so don't copy. */
381 #define CRD_F_IV_EXPLICIT 0x04 /* IV explicitly provided */
382 #define CRD_F_DSA_SHA_NEEDED 0x08 /* Compute SHA-1 of buffer for DSA */
383 #define CRD_F_COMP 0x0f /* Set when doing compression */
384 #define CRD_F_KEY_EXPLICIT 0x10 /* Key explicitly provided */
386 struct cryptoini CRD_INI; /* Initialization/context data */
387 #define crd_esn CRD_INI.cri_esn
388 #define crd_iv CRD_INI.cri_iv
389 #define crd_key CRD_INI.cri_key
390 #define crd_alg CRD_INI.cri_alg
391 #define crd_klen CRD_INI.cri_klen
393 struct cryptodesc *crd_next;
396 /* Structure describing complete operation */
398 TAILQ_ENTRY(cryptop) crp_next;
400 struct task crp_task;
402 u_int64_t crp_sid; /* Session ID */
403 int crp_ilen; /* Input data total length */
404 int crp_olen; /* Result total length */
407 * Error type (zero means no error).
408 * All error codes except EAGAIN
409 * indicate possible data corruption (as in,
410 * the data have been touched). On all
411 * errors, the crp_sid may have changed
412 * (reset to a new one), so the caller
413 * should always check and use the new
414 * value on future requests.
418 #define CRYPTO_F_IMBUF 0x0001 /* Input/output are mbuf chains */
419 #define CRYPTO_F_IOV 0x0002 /* Input/output are uio */
420 #define CRYPTO_F_BATCH 0x0008 /* Batch op if possible */
421 #define CRYPTO_F_CBIMM 0x0010 /* Do callback immediately */
422 #define CRYPTO_F_DONE 0x0020 /* Operation completed */
423 #define CRYPTO_F_CBIFSYNC 0x0040 /* Do CBIMM if op is synchronous */
424 #define CRYPTO_F_ASYNC 0x0080 /* Dispatch crypto jobs on several threads
425 * if op is synchronous
427 #define CRYPTO_F_ASYNC_KEEPORDER 0x0100 /*
428 * Dispatch the crypto jobs in the same
429 * order there are submitted. Applied only
430 * if CRYPTO_F_ASYNC flags is set
434 caddr_t crp_buf; /* Data to be processed */
435 struct mbuf *crp_mbuf;
438 void * crp_opaque; /* Opaque pointer, passed along */
439 struct cryptodesc *crp_desc; /* Linked list of processing descriptors */
441 int (*crp_callback)(struct cryptop *); /* Callback function */
443 struct bintime crp_tstamp; /* performance time stamp */
444 uint32_t crp_seq; /* used for ordered dispatch */
445 uint32_t crp_retw_id; /*
446 * the return worker to be used,
447 * used for ordered dispatch
451 #define CRYPTOP_ASYNC(crp) \
452 (((crp)->crp_flags & CRYPTO_F_ASYNC) && \
453 CRYPTO_SESID2CAPS((crp)->crp_sid) & CRYPTOCAP_F_SYNC)
454 #define CRYPTOP_ASYNC_KEEPORDER(crp) \
455 (CRYPTOP_ASYNC(crp) && \
456 (crp)->crp_flags & CRYPTO_F_ASYNC_KEEPORDER)
458 #define CRYPTO_BUF_CONTIG 0x0
459 #define CRYPTO_BUF_IOV 0x1
460 #define CRYPTO_BUF_MBUF 0x2
462 #define CRYPTO_OP_DECRYPT 0x0
463 #define CRYPTO_OP_ENCRYPT 0x1
466 * Hints passed to process methods.
468 #define CRYPTO_HINT_MORE 0x1 /* more ops coming shortly */
471 TAILQ_ENTRY(cryptkop) krp_next;
473 u_int krp_op; /* ie. CRK_MOD_EXP or other */
474 u_int krp_status; /* return status */
475 u_short krp_iparams; /* # of input parameters */
476 u_short krp_oparams; /* # of output parameters */
477 u_int krp_crid; /* desired device, etc. */
479 struct crparam krp_param[CRK_MAXPARAM]; /* kvm */
480 int (*krp_callback)(struct cryptkop *);
484 * Session ids are 64 bits. The lower 32 bits contain a "local id" which
485 * is a driver-private session identifier. The upper 32 bits contain a
486 * "hardware id" used by the core crypto code to identify the driver and
487 * a copy of the driver's capabilities that can be used by client code to
488 * optimize operation.
490 #define CRYPTO_SESID2HID(_sid) (((_sid) >> 32) & 0x00ffffff)
491 #define CRYPTO_SESID2CAPS(_sid) (((_sid) >> 32) & 0xff000000)
492 #define CRYPTO_SESID2LID(_sid) (((u_int32_t) (_sid)) & 0xffffffff)
494 MALLOC_DECLARE(M_CRYPTO_DATA);
496 extern int crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int hard);
497 extern int crypto_freesession(u_int64_t sid);
498 #define CRYPTOCAP_F_HARDWARE CRYPTO_FLAG_HARDWARE
499 #define CRYPTOCAP_F_SOFTWARE CRYPTO_FLAG_SOFTWARE
500 #define CRYPTOCAP_F_SYNC 0x04000000 /* operates synchronously */
501 extern int32_t crypto_get_driverid(device_t dev, int flags);
502 extern int crypto_find_driver(const char *);
503 extern device_t crypto_find_device_byhid(int hid);
504 extern int crypto_getcaps(int hid);
505 extern int crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
507 extern int crypto_kregister(u_int32_t, int, u_int32_t);
508 extern int crypto_unregister(u_int32_t driverid, int alg);
509 extern int crypto_unregister_all(u_int32_t driverid);
510 extern int crypto_dispatch(struct cryptop *crp);
511 extern int crypto_kdispatch(struct cryptkop *);
512 #define CRYPTO_SYMQ 0x1
513 #define CRYPTO_ASYMQ 0x2
514 extern int crypto_unblock(u_int32_t, int);
515 extern void crypto_done(struct cryptop *crp);
516 extern void crypto_kdone(struct cryptkop *);
517 extern int crypto_getfeat(int *);
519 extern void crypto_freereq(struct cryptop *crp);
520 extern struct cryptop *crypto_getreq(int num);
522 extern int crypto_usercrypto; /* userland may do crypto requests */
523 extern int crypto_userasymcrypto; /* userland may do asym crypto reqs */
524 extern int crypto_devallowsoft; /* only use hardware crypto */
527 * Crypto-related utility routines used mainly by drivers.
529 * XXX these don't really belong here; but for now they're
530 * kept apart from the rest of the system.
533 extern void cuio_copydata(struct uio* uio, int off, int len, caddr_t cp);
534 extern void cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp);
535 extern int cuio_getptr(struct uio *uio, int loc, int *off);
536 extern int cuio_apply(struct uio *uio, int off, int len,
537 int (*f)(void *, void *, u_int), void *arg);
541 extern int crypto_mbuftoiov(struct mbuf *mbuf, struct iovec **iovptr,
542 int *cnt, int *allocated);
544 extern void crypto_copyback(int flags, caddr_t buf, int off, int size,
546 extern void crypto_copydata(int flags, caddr_t buf, int off, int size,
548 extern int crypto_apply(int flags, caddr_t buf, int off, int len,
549 int (*f)(void *, void *, u_int), void *arg);
552 #endif /* _CRYPTO_CRYPTO_H_ */