FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/cryptodev.h

     /*      $FreeBSD: releng/12.0/sys/opencrypto/cryptodev.h 337939 2018-08-17 00:30:04Z cem $      */
     /*      $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>
    #include <sys/_task.h>
    
    #ifdef _KERNEL
    #include <opencrypto/_cryptodev.h>
    #endif
    
    /* 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_224_HASH_LEN       28
    #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
    #define POLY1305_HASH_LEN       16
    /* Maximum hash algorithm result length */
    #define HASH_MAX_LEN            SHA2_512_HASH_LEN /* Keep this updated */
    
    #define MD5_BLOCK_LEN           64
    #define SHA1_BLOCK_LEN          64
    #define RIPEMD160_BLOCK_LEN     64
    #define SHA2_224_BLOCK_LEN      64
    #define SHA2_256_BLOCK_LEN      64
    #define SHA2_384_BLOCK_LEN      128
    #define SHA2_512_BLOCK_LEN      128
    
   /* HMAC values */
   #define NULL_HMAC_BLOCK_LEN             64
   /* Maximum HMAC block length */
   #define HMAC_MAX_BLOCK_LEN      SHA2_512_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
   
   #define POLY1305_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 CHACHA20_NATIVE_BLOCK_LEN       64
   #define EALG_MAX_BLOCK_LEN      CHACHA20_NATIVE_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_BLAKE2B          29 /* Blake2b hash */
   #define CRYPTO_BLAKE2S          30 /* Blake2s hash */
   #define CRYPTO_CHACHA20         31 /* Chacha20 stream cipher */
   #define CRYPTO_SHA2_224_HMAC    32
   #define CRYPTO_RIPEMD160        33
   #define CRYPTO_SHA2_224         34
   #define CRYPTO_SHA2_256         35
   #define CRYPTO_SHA2_384         36
   #define CRYPTO_SHA2_512         37
   #define CRYPTO_POLY1305         38
   #define CRYPTO_ALGORITHM_MAX    38 /* 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 # */ 
   };
   
   /*
    * session and crypt _op structs are used by userspace programs to interact
    * with /dev/crypto.  Confusingly, the internal kernel interface is named
    * "cryptop" (no underscore).
    */
   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__, ## __VA_ARGS__);   \
   } while (0)
   #else
   #define CRYPTDEB(...)   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;
   
           struct task     crp_task;
   
           crypto_session_t crp_session;   /* Session */
           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_session 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 */
   #define CRYPTO_F_ASYNC          0x0080  /* Dispatch crypto jobs on several threads
                                            * if op is synchronous
                                            */
   #define CRYPTO_F_ASYNC_KEEPORDER        0x0100  /*
                                            * Dispatch the crypto jobs in the same
                                            * order there are submitted. Applied only
                                            * if CRYPTO_F_ASYNC flags is set
                                            */
   
           union {
                   caddr_t         crp_buf;        /* Data to be processed */
                   struct mbuf     *crp_mbuf;
                   struct uio      *crp_uio;
           };
           void *          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 */
           uint32_t        crp_seq;        /* used for ordered dispatch */
           uint32_t        crp_retw_id;    /*
                                            * the return worker to be used,
                                            *  used for ordered dispatch
                                            */
   };
   
   #define CRYPTOP_ASYNC(crp) \
           (((crp)->crp_flags & CRYPTO_F_ASYNC) && \
           crypto_ses2caps((crp)->crp_session) & CRYPTOCAP_F_SYNC)
   #define CRYPTOP_ASYNC_KEEPORDER(crp) \
           (CRYPTOP_ASYNC(crp) && \
           (crp)->crp_flags & CRYPTO_F_ASYNC_KEEPORDER)
   
   #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 *);
   };
   
   uint32_t crypto_ses2hid(crypto_session_t crypto_session);
   uint32_t crypto_ses2caps(crypto_session_t crypto_session);
   void *crypto_get_driver_session(crypto_session_t crypto_session);
   
   MALLOC_DECLARE(M_CRYPTO_DATA);
   
   extern  int crypto_newsession(crypto_session_t *cses, struct cryptoini *cri, int hard);
   extern  void crypto_freesession(crypto_session_t cses);
   #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, size_t session_size,
       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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