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freebsd-skq/sys/opencrypto/cryptodev.h
Conrad Meyer 3693b18840 opencrypto: Loosen restriction on HMAC key sizes 
Theoretically, HMACs do not actually have any limit on key sizes.
Transforms should compact input keys larger than the HMAC block size by
using the transform (hash) on the input key.

(Short input keys are padded out with zeros to the HMAC block size.)

Still, not all FreeBSD crypto drivers that provide HMAC functionality
handle longer-than-blocksize keys appropriately, so enforce a "maximum" key
length in the crypto API for auth_hashes that previously expressed a
requirement.  (The "maximum" is the size of a single HMAC block for the
given transform.)  Unconstrained auth_hashes are left as-is.

I believe the previous hardcoded sizes were committed in the original
import of opencrypto from OpenBSD and are due to specific protocol
details of IPSec.  Note that none of the previous sizes actually matched
the appropriate HMAC block size.

The previous hardcoded sizes made the SHA tests in cryptotest.py
useless for testing FreeBSD crypto drivers; none of the NIST-KAT example
inputs had keys sized to the previous expectations.

The following drivers were audited to check that they handled keys up to
the block size of the HMAC safely:

  Software HMAC:
    * padlock(4)
    * cesa
    * glxsb
    * safe(4)
    * ubsec(4)

  Hardware accelerated HMAC:
    * ccr(4)
    * hifn(4)
    * sec(4) (Only supports up to 64 byte keys despite claiming to
      support SHA2 HMACs, but validates input key sizes)
    * cryptocteon (MIPS)
    * nlmsec (MIPS)
    * rmisec (MIPS) (Amusingly, does not appear to use key material at
      all -- presumed broken)

Reviewed by:	jhb (previous version), rlibby (previous version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D12437
2017-09-26 16:18:10 +00:00

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/* $FreeBSD$ */
/* $OpenBSD: cryptodev.h,v 1.31 2002/06/11 11:14:29 beck Exp $ */
/*-
* The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
* Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
*
* This code was written by Angelos D. Keromytis in Athens, Greece, in
* February 2000. Network Security Technologies Inc. (NSTI) kindly
* supported the development of this code.
*
* Copyright (c) 2000 Angelos D. Keromytis
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all source code copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*
* Copyright (c) 2001 Theo de Raadt
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by John-Mark Gurney
* under sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Effort sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F30602-01-2-0537.
*
*/
#ifndef _CRYPTO_CRYPTO_H_
#define _CRYPTO_CRYPTO_H_
#include <sys/ioccom.h>
/* Some initial values */
#define CRYPTO_DRIVERS_INITIAL 4
#define CRYPTO_SW_SESSIONS 32
/* Hash values */
#define NULL_HASH_LEN 16
#define MD5_HASH_LEN 16
#define SHA1_HASH_LEN 20
#define RIPEMD160_HASH_LEN 20
#define SHA2_256_HASH_LEN 32
#define SHA2_384_HASH_LEN 48
#define SHA2_512_HASH_LEN 64
#define MD5_KPDK_HASH_LEN 16
#define SHA1_KPDK_HASH_LEN 20
#define AES_GMAC_HASH_LEN 16
/* Maximum hash algorithm result length */
#define HASH_MAX_LEN SHA2_512_HASH_LEN /* Keep this updated */
/* HMAC values */
#define NULL_HMAC_BLOCK_LEN 64
#define MD5_HMAC_BLOCK_LEN 64
#define SHA1_HMAC_BLOCK_LEN 64
#define RIPEMD160_HMAC_BLOCK_LEN 64
#define SHA2_256_HMAC_BLOCK_LEN 64
#define SHA2_384_HMAC_BLOCK_LEN 128
#define SHA2_512_HMAC_BLOCK_LEN 128
/* Maximum HMAC block length */
#define HMAC_MAX_BLOCK_LEN SHA2_512_HMAC_BLOCK_LEN /* Keep this updated */
#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C
/* HMAC Key Length */
#define AES_128_GMAC_KEY_LEN 16
#define AES_192_GMAC_KEY_LEN 24
#define AES_256_GMAC_KEY_LEN 32
/* Encryption algorithm block sizes */
#define NULL_BLOCK_LEN 4 /* IPsec to maintain alignment */
#define DES_BLOCK_LEN 8
#define DES3_BLOCK_LEN 8
#define BLOWFISH_BLOCK_LEN 8
#define SKIPJACK_BLOCK_LEN 8
#define CAST128_BLOCK_LEN 8
#define RIJNDAEL128_BLOCK_LEN 16
#define AES_BLOCK_LEN 16
#define AES_ICM_BLOCK_LEN 1
#define ARC4_BLOCK_LEN 1
#define CAMELLIA_BLOCK_LEN 16
#define EALG_MAX_BLOCK_LEN AES_BLOCK_LEN /* Keep this updated */
/* IV Lengths */
#define ARC4_IV_LEN 1
#define AES_GCM_IV_LEN 12
#define AES_XTS_IV_LEN 8
#define AES_XTS_ALPHA 0x87 /* GF(2^128) generator polynomial */
/* Min and Max Encryption Key Sizes */
#define NULL_MIN_KEY 0
#define NULL_MAX_KEY 256 /* 2048 bits, max key */
#define DES_MIN_KEY 8
#define DES_MAX_KEY DES_MIN_KEY
#define TRIPLE_DES_MIN_KEY 24
#define TRIPLE_DES_MAX_KEY TRIPLE_DES_MIN_KEY
#define BLOWFISH_MIN_KEY 5
#define BLOWFISH_MAX_KEY 56 /* 448 bits, max key */
#define CAST_MIN_KEY 5
#define CAST_MAX_KEY 16
#define SKIPJACK_MIN_KEY 10
#define SKIPJACK_MAX_KEY SKIPJACK_MIN_KEY
#define RIJNDAEL_MIN_KEY 16
#define RIJNDAEL_MAX_KEY 32
#define AES_MIN_KEY RIJNDAEL_MIN_KEY
#define AES_MAX_KEY RIJNDAEL_MAX_KEY
#define AES_XTS_MIN_KEY (2 * AES_MIN_KEY)
#define AES_XTS_MAX_KEY (2 * AES_MAX_KEY)
#define ARC4_MIN_KEY 1
#define ARC4_MAX_KEY 32
#define CAMELLIA_MIN_KEY 8
#define CAMELLIA_MAX_KEY 32
/* Maximum hash algorithm result length */
#define AALG_MAX_RESULT_LEN 64 /* Keep this updated */
#define CRYPTO_ALGORITHM_MIN 1
#define CRYPTO_DES_CBC 1
#define CRYPTO_3DES_CBC 2
#define CRYPTO_BLF_CBC 3
#define CRYPTO_CAST_CBC 4
#define CRYPTO_SKIPJACK_CBC 5
#define CRYPTO_MD5_HMAC 6
#define CRYPTO_SHA1_HMAC 7
#define CRYPTO_RIPEMD160_HMAC 8
#define CRYPTO_MD5_KPDK 9
#define CRYPTO_SHA1_KPDK 10
#define CRYPTO_RIJNDAEL128_CBC 11 /* 128 bit blocksize */
#define CRYPTO_AES_CBC 11 /* 128 bit blocksize -- the same as above */
#define CRYPTO_ARC4 12
#define CRYPTO_MD5 13
#define CRYPTO_SHA1 14
#define CRYPTO_NULL_HMAC 15
#define CRYPTO_NULL_CBC 16
#define CRYPTO_DEFLATE_COMP 17 /* Deflate compression algorithm */
#define CRYPTO_SHA2_256_HMAC 18
#define CRYPTO_SHA2_384_HMAC 19
#define CRYPTO_SHA2_512_HMAC 20
#define CRYPTO_CAMELLIA_CBC 21
#define CRYPTO_AES_XTS 22
#define CRYPTO_AES_ICM 23 /* commonly known as CTR mode */
#define CRYPTO_AES_NIST_GMAC 24 /* cipher side */
#define CRYPTO_AES_NIST_GCM_16 25 /* 16 byte ICV */
#define CRYPTO_AES_128_NIST_GMAC 26 /* auth side */
#define CRYPTO_AES_192_NIST_GMAC 27 /* auth side */
#define CRYPTO_AES_256_NIST_GMAC 28 /* auth side */
#define CRYPTO_ALGORITHM_MAX 28 /* Keep updated - see below */
#define CRYPTO_ALGO_VALID(x) ((x) >= CRYPTO_ALGORITHM_MIN && \
(x) <= CRYPTO_ALGORITHM_MAX)
/* Algorithm flags */
#define CRYPTO_ALG_FLAG_SUPPORTED 0x01 /* Algorithm is supported */
#define CRYPTO_ALG_FLAG_RNG_ENABLE 0x02 /* Has HW RNG for DH/DSA */
#define CRYPTO_ALG_FLAG_DSA_SHA 0x04 /* Can do SHA on msg */
/*
* Crypto driver/device flags. They can set in the crid
* parameter when creating a session or submitting a key
* op to affect the device/driver assigned. If neither
* of these are specified then the crid is assumed to hold
* the driver id of an existing (and suitable) device that
* must be used to satisfy the request.
*/
#define CRYPTO_FLAG_HARDWARE 0x01000000 /* hardware accelerated */
#define CRYPTO_FLAG_SOFTWARE 0x02000000 /* software implementation */
/* NB: deprecated */
struct session_op {
u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
u_int32_t keylen; /* cipher key */
c_caddr_t key;
int mackeylen; /* mac key */
c_caddr_t mackey;
u_int32_t ses; /* returns: session # */
};
struct session2_op {
u_int32_t cipher; /* ie. CRYPTO_DES_CBC */
u_int32_t mac; /* ie. CRYPTO_MD5_HMAC */
u_int32_t keylen; /* cipher key */
c_caddr_t key;
int mackeylen; /* mac key */
c_caddr_t mackey;
u_int32_t ses; /* returns: session # */
int crid; /* driver id + flags (rw) */
int pad[4]; /* for future expansion */
};
struct crypt_op {
u_int32_t ses;
u_int16_t op; /* i.e. COP_ENCRYPT */
#define COP_ENCRYPT 1
#define COP_DECRYPT 2
u_int16_t flags;
#define COP_F_CIPHER_FIRST 0x0001 /* Cipher before MAC. */
#define COP_F_BATCH 0x0008 /* Batch op if possible */
u_int len;
c_caddr_t src; /* become iov[] inside kernel */
caddr_t dst;
caddr_t mac; /* must be big enough for chosen MAC */
c_caddr_t iv;
};
/* op and flags the same as crypt_op */
struct crypt_aead {
u_int32_t ses;
u_int16_t op; /* i.e. COP_ENCRYPT */
u_int16_t flags;
u_int len;
u_int aadlen;
u_int ivlen;
c_caddr_t src; /* become iov[] inside kernel */
caddr_t dst;
c_caddr_t aad; /* additional authenticated data */
caddr_t tag; /* must fit for chosen TAG length */
c_caddr_t iv;
};
/*
* Parameters for looking up a crypto driver/device by
* device name or by id. The latter are returned for
* created sessions (crid) and completed key operations.
*/
struct crypt_find_op {
int crid; /* driver id + flags */
char name[32]; /* device/driver name */
};
/* bignum parameter, in packed bytes, ... */
struct crparam {
caddr_t crp_p;
u_int crp_nbits;
};
#define CRK_MAXPARAM 8
struct crypt_kop {
u_int crk_op; /* ie. CRK_MOD_EXP or other */
u_int crk_status; /* return status */
u_short crk_iparams; /* # of input parameters */
u_short crk_oparams; /* # of output parameters */
u_int crk_crid; /* NB: only used by CIOCKEY2 (rw) */
struct crparam crk_param[CRK_MAXPARAM];
};
#define CRK_ALGORITM_MIN 0
#define CRK_MOD_EXP 0
#define CRK_MOD_EXP_CRT 1
#define CRK_DSA_SIGN 2
#define CRK_DSA_VERIFY 3
#define CRK_DH_COMPUTE_KEY 4
#define CRK_ALGORITHM_MAX 4 /* Keep updated - see below */
#define CRF_MOD_EXP (1 << CRK_MOD_EXP)
#define CRF_MOD_EXP_CRT (1 << CRK_MOD_EXP_CRT)
#define CRF_DSA_SIGN (1 << CRK_DSA_SIGN)
#define CRF_DSA_VERIFY (1 << CRK_DSA_VERIFY)
#define CRF_DH_COMPUTE_KEY (1 << CRK_DH_COMPUTE_KEY)
/*
* done against open of /dev/crypto, to get a cloned descriptor.
* Please use F_SETFD against the cloned descriptor.
*/
#define CRIOGET _IOWR('c', 100, u_int32_t)
#define CRIOASYMFEAT CIOCASYMFEAT
#define CRIOFINDDEV CIOCFINDDEV
/* the following are done against the cloned descriptor */
#define CIOCGSESSION _IOWR('c', 101, struct session_op)
#define CIOCFSESSION _IOW('c', 102, u_int32_t)
#define CIOCCRYPT _IOWR('c', 103, struct crypt_op)
#define CIOCKEY _IOWR('c', 104, struct crypt_kop)
#define CIOCASYMFEAT _IOR('c', 105, u_int32_t)
#define CIOCGSESSION2 _IOWR('c', 106, struct session2_op)
#define CIOCKEY2 _IOWR('c', 107, struct crypt_kop)
#define CIOCFINDDEV _IOWR('c', 108, struct crypt_find_op)
#define CIOCCRYPTAEAD _IOWR('c', 109, struct crypt_aead)
struct cryptotstat {
struct timespec acc; /* total accumulated time */
struct timespec min; /* min time */
struct timespec max; /* max time */
u_int32_t count; /* number of observations */
};
struct cryptostats {
u_int32_t cs_ops; /* symmetric crypto ops submitted */
u_int32_t cs_errs; /* symmetric crypto ops that failed */
u_int32_t cs_kops; /* asymetric/key ops submitted */
u_int32_t cs_kerrs; /* asymetric/key ops that failed */
u_int32_t cs_intrs; /* crypto swi thread activations */
u_int32_t cs_rets; /* crypto return thread activations */
u_int32_t cs_blocks; /* symmetric op driver block */
u_int32_t cs_kblocks; /* symmetric op driver block */
/*
* When CRYPTO_TIMING is defined at compile time and the
* sysctl debug.crypto is set to 1, the crypto system will
* accumulate statistics about how long it takes to process
* crypto requests at various points during processing.
*/
struct cryptotstat cs_invoke; /* crypto_dipsatch -> crypto_invoke */
struct cryptotstat cs_done; /* crypto_invoke -> crypto_done */
struct cryptotstat cs_cb; /* crypto_done -> callback */
struct cryptotstat cs_finis; /* callback -> callback return */
};
#ifdef _KERNEL
#if 0
#define CRYPTDEB(s) do { printf("%s:%d: %s\n", __FILE__, __LINE__, s); \
} while (0)
#else
#define CRYPTDEB(s) do { } while (0)
#endif
/* Standard initialization structure beginning */
struct cryptoini {
int cri_alg; /* Algorithm to use */
int cri_klen; /* Key length, in bits */
int cri_mlen; /* Number of bytes we want from the
entire hash. 0 means all. */
caddr_t cri_key; /* key to use */
u_int8_t cri_iv[EALG_MAX_BLOCK_LEN]; /* IV to use */
struct cryptoini *cri_next;
};
/* Describe boundaries of a single crypto operation */
struct cryptodesc {
int crd_skip; /* How many bytes to ignore from start */
int crd_len; /* How many bytes to process */
int crd_inject; /* Where to inject results, if applicable */
int crd_flags;
#define CRD_F_ENCRYPT 0x01 /* Set when doing encryption */
#define CRD_F_IV_PRESENT 0x02 /* When encrypting, IV is already in
place, so don't copy. */
#define CRD_F_IV_EXPLICIT 0x04 /* IV explicitly provided */
#define CRD_F_DSA_SHA_NEEDED 0x08 /* Compute SHA-1 of buffer for DSA */
#define CRD_F_COMP 0x0f /* Set when doing compression */
#define CRD_F_KEY_EXPLICIT 0x10 /* Key explicitly provided */
struct cryptoini CRD_INI; /* Initialization/context data */
#define crd_esn CRD_INI.cri_esn
#define crd_iv CRD_INI.cri_iv
#define crd_key CRD_INI.cri_key
#define crd_alg CRD_INI.cri_alg
#define crd_klen CRD_INI.cri_klen
struct cryptodesc *crd_next;
};
/* Structure describing complete operation */
struct cryptop {
TAILQ_ENTRY(cryptop) crp_next;
u_int64_t crp_sid; /* Session ID */
int crp_ilen; /* Input data total length */
int crp_olen; /* Result total length */
int crp_etype; /*
* Error type (zero means no error).
* All error codes except EAGAIN
* indicate possible data corruption (as in,
* the data have been touched). On all
* errors, the crp_sid may have changed
* (reset to a new one), so the caller
* should always check and use the new
* value on future requests.
*/
int crp_flags;
#define CRYPTO_F_IMBUF 0x0001 /* Input/output are mbuf chains */
#define CRYPTO_F_IOV 0x0002 /* Input/output are uio */
#define CRYPTO_F_BATCH 0x0008 /* Batch op if possible */
#define CRYPTO_F_CBIMM 0x0010 /* Do callback immediately */
#define CRYPTO_F_DONE 0x0020 /* Operation completed */
#define CRYPTO_F_CBIFSYNC 0x0040 /* Do CBIMM if op is synchronous */
caddr_t crp_buf; /* Data to be processed */
caddr_t crp_opaque; /* Opaque pointer, passed along */
struct cryptodesc *crp_desc; /* Linked list of processing descriptors */
int (*crp_callback)(struct cryptop *); /* Callback function */
struct bintime crp_tstamp; /* performance time stamp */
};
#define CRYPTO_BUF_CONTIG 0x0
#define CRYPTO_BUF_IOV 0x1
#define CRYPTO_BUF_MBUF 0x2
#define CRYPTO_OP_DECRYPT 0x0
#define CRYPTO_OP_ENCRYPT 0x1
/*
* Hints passed to process methods.
*/
#define CRYPTO_HINT_MORE 0x1 /* more ops coming shortly */
struct cryptkop {
TAILQ_ENTRY(cryptkop) krp_next;
u_int krp_op; /* ie. CRK_MOD_EXP or other */
u_int krp_status; /* return status */
u_short krp_iparams; /* # of input parameters */
u_short krp_oparams; /* # of output parameters */
u_int krp_crid; /* desired device, etc. */
u_int32_t krp_hid;
struct crparam krp_param[CRK_MAXPARAM]; /* kvm */
int (*krp_callback)(struct cryptkop *);
};
/*
* Session ids are 64 bits. The lower 32 bits contain a "local id" which
* is a driver-private session identifier. The upper 32 bits contain a
* "hardware id" used by the core crypto code to identify the driver and
* a copy of the driver's capabilities that can be used by client code to
* optimize operation.
*/
#define CRYPTO_SESID2HID(_sid) (((_sid) >> 32) & 0x00ffffff)
#define CRYPTO_SESID2CAPS(_sid) (((_sid) >> 32) & 0xff000000)
#define CRYPTO_SESID2LID(_sid) (((u_int32_t) (_sid)) & 0xffffffff)
MALLOC_DECLARE(M_CRYPTO_DATA);
extern int crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int hard);
extern int crypto_freesession(u_int64_t sid);
#define CRYPTOCAP_F_HARDWARE CRYPTO_FLAG_HARDWARE
#define CRYPTOCAP_F_SOFTWARE CRYPTO_FLAG_SOFTWARE
#define CRYPTOCAP_F_SYNC 0x04000000 /* operates synchronously */
extern int32_t crypto_get_driverid(device_t dev, int flags);
extern int crypto_find_driver(const char *);
extern device_t crypto_find_device_byhid(int hid);
extern int crypto_getcaps(int hid);
extern int crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
u_int32_t flags);
extern int crypto_kregister(u_int32_t, int, u_int32_t);
extern int crypto_unregister(u_int32_t driverid, int alg);
extern int crypto_unregister_all(u_int32_t driverid);
extern int crypto_dispatch(struct cryptop *crp);
extern int crypto_kdispatch(struct cryptkop *);
#define CRYPTO_SYMQ 0x1
#define CRYPTO_ASYMQ 0x2
extern int crypto_unblock(u_int32_t, int);
extern void crypto_done(struct cryptop *crp);
extern void crypto_kdone(struct cryptkop *);
extern int crypto_getfeat(int *);
extern void crypto_freereq(struct cryptop *crp);
extern struct cryptop *crypto_getreq(int num);
extern int crypto_usercrypto; /* userland may do crypto requests */
extern int crypto_userasymcrypto; /* userland may do asym crypto reqs */
extern int crypto_devallowsoft; /* only use hardware crypto */
/*
* Crypto-related utility routines used mainly by drivers.
*
* XXX these don't really belong here; but for now they're
* kept apart from the rest of the system.
*/
struct uio;
extern void cuio_copydata(struct uio* uio, int off, int len, caddr_t cp);
extern void cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp);
extern int cuio_getptr(struct uio *uio, int loc, int *off);
extern int cuio_apply(struct uio *uio, int off, int len,
int (*f)(void *, void *, u_int), void *arg);
struct mbuf;
struct iovec;
extern int crypto_mbuftoiov(struct mbuf *mbuf, struct iovec **iovptr,
int *cnt, int *allocated);
extern void crypto_copyback(int flags, caddr_t buf, int off, int size,
c_caddr_t in);
extern void crypto_copydata(int flags, caddr_t buf, int off, int size,
caddr_t out);
extern int crypto_apply(int flags, caddr_t buf, int off, int len,
int (*f)(void *, void *, u_int), void *arg);
#endif /* _KERNEL */
#endif /* _CRYPTO_CRYPTO_H_ */
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