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

     /*      $NetBSD: cryptodev.h,v 1.14.10.2 2009/05/03 17:24:45 snj Exp $ */
     /*      $FreeBSD: src/sys/opencrypto/cryptodev.h,v 1.2.2.6 2003/07/02 17:04:50 sam Exp $        */
     /*      $OpenBSD: cryptodev.h,v 1.33 2002/07/17 23:52:39 art Exp $      */
     
     /*-
      * Copyright (c) 2008 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
     * by Coyote Point Systems, Inc.
     *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``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 FOUNDATION OR CONTRIBUTORS
     * 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.
     */
    
    /*
     * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
     *
     * 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
     *
     * 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
    
    /* HMAC values */
    #define HMAC_BLOCK_LEN          64
    #define HMAC_IPAD_VAL           0x36
    #define HMAC_OPAD_VAL           0x5C
    
    /* Encryption algorithm block sizes */
   #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 EALG_MAX_BLOCK_LEN      16 /* Keep this updated */
   
   /* 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_SHA2_HMAC        15
   #define CRYPTO_NULL_HMAC        16
   #define CRYPTO_NULL_CBC         17
   #define CRYPTO_DEFLATE_COMP     18 /* Deflate compression algorithm */
   #define CRYPTO_MD5_HMAC_96      19 
   #define CRYPTO_SHA1_HMAC_96     20
   #define CRYPTO_RIPEMD160_HMAC_96        21
   #define CRYPTO_GZIP_COMP        22 /* Deflate compression algorithm */
   #define CRYPTO_ALGORITHM_MAX    23 /* Keep updated - see below */
   
   /* 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 */
   
   struct session_op {
           u_int32_t       cipher;         /* ie. CRYPTO_DES_CBC */
           u_int32_t       mac;            /* ie. CRYPTO_MD5_HMAC */
           u_int32_t       comp_alg;       /* ie. CRYPTO_GZIP_COMP */
   
           u_int32_t       keylen;         /* cipher key */
           void *          key;
           int             mackeylen;      /* mac key */
           void *          mackey;
   
           u_int32_t       ses;            /* returns: session # */
   };
   
   /* to support multiple session creation */
   
   struct session_n_op {
           u_int32_t       cipher;         /* ie. CRYPTO_DES_CBC */
           u_int32_t       mac;            /* ie. CRYPTO_MD5_HMAC */
           u_int32_t       comp_alg;       /* ie. CRYPTO_GZIP_COMP */
   
           u_int32_t       keylen;         /* cipher key */
           void *          key;
           int             mackeylen;      /* mac key */
           void *          mackey;
   
           u_int32_t       ses;            /* returns: session # */
           int             status;
   };
   
   struct crypt_op {
           u_int32_t       ses;
           u_int16_t       op;             /* i.e. COP_ENCRYPT */
   #define COP_ENCRYPT     1
   #define COP_DECRYPT     2
   #define COP_COMP        3
   #define COP_DECOMP      4
           u_int16_t       flags;
   #define COP_F_BATCH     0x0008          /* Dispatch as quickly as possible */
           u_int           len;            /* src len */
           void *          src, *dst;      /* become iov[] inside kernel */
           void *          mac;            /* must be big enough for chosen MAC */
           void *          iv;
           u_int           dst_len;        /* dst len if not 0 */
   };
   
   /* to support multiple session creation */
   /*
    *
    * The reqid field is filled when the operation has 
    * been accepted and started, and can be used to later retrieve
    * the operation results via CIOCNCRYPTRET or identify the 
    * request in the completion list returned by CIOCNCRYPTRETM.
    *
    * The opaque pointer can be set arbitrarily by the user
    * and it is passed back in the crypt_result structure
    * when the request completes.  This field can be used for example
    * to track context for the request and avoid lookups in the
    * user application.
    */
   
   struct crypt_n_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_BATCH     0x0008          /* Dispatch as quickly as possible */
   #define COP_F_MORE      0x0010          /* more data to follow */
           u_int           len;            /* src len */
   
           u_int32_t       reqid;          /* request id */
           int             status;         /* status of request -accepted or not */        
           void            *opaque;        /* opaque pointer returned to user */
           u_int32_t       keylen;         /* cipher key - optional */
           void *          key;
           u_int32_t       mackeylen;      /* also optional */
           void *          mackey;
   
           void *          src, *dst;      /* become iov[] inside kernel */
           void *          mac;            /* must be big enough for chosen MAC */
           void *          iv;
           u_int           dst_len;        /* dst len if not 0 */
   };
   
   /* CIOCNCRYPTM ioctl argument, supporting one or more asynchronous
    * crypt_n_op operations.
    * Each crypt_n_op will receive a request id which can be used to check its
    * status via CIOCNCRYPTRET, or to watch for its completion in the list
    * obtained via CIOCNCRYPTRETM.
    */
   struct crypt_mop {
           size_t          count;          /* how many */
           struct crypt_n_op *     reqs;   /* where to get them */
   };
   
   struct crypt_sfop {
           size_t          count;
           u_int32_t       *sesid;
   }; 
   
   struct crypt_sgop {
           size_t          count;
           struct session_n_op * sessions;
   };
   
   #define CRYPTO_MAX_MAC_LEN      20
   
   /* bignum parameter, in packed bytes, ... */
   struct crparam {
           void *          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_pad1;
           struct crparam  crk_param[CRK_MAXPARAM];
   };
   
   /*
    * Used with the CIOCNFKEYM ioctl.
    *
    * This structure allows the OCF to return a request id
    * for each of the kop operations specified in the CIOCNFKEYM call.
    * 
    * The crk_opaque pointer can be arbitrarily set by the user
    * and it is passed back in the crypt_result structure
    * when the request completes.  This field can be used for example
    * to track context for the request and avoid lookups in the
    * user application.
    */
   struct crypt_n_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_int32_t       crk_reqid;      /* request id */
           struct crparam  crk_param[CRK_MAXPARAM];
           void            *crk_opaque;    /* opaque pointer returned to user */
   };
   
   struct crypt_mkop {
           size_t  count;                  /* how many */
           struct crypt_n_kop *    reqs;   /* where to get them */
   };
   
   /* Asynchronous key or crypto result.
    * Note that the status will be set in the crypt_result structure,
    * not in the original crypt_kop structure (crk_status).
    */
   struct crypt_result {
           u_int32_t       reqid;          /* request id */
           u_int32_t       status;         /* status of request: 0 if successful */
           void *          opaque;         /* Opaque pointer from the user, passed along */
   };
   
   struct cryptret {
           size_t          count;          /* space for how many */
           struct crypt_result *   results;        /* where to put them */
   }; 
   
   
   /* Assymetric key operations */
   #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_MOD_ADD             5
   #define CRK_MOD_ADDINV          6
   #define CRK_MOD_SUB             7
   #define CRK_MOD_MULT            8
   #define CRK_MOD_MULTINV         9
   #define CRK_MOD                 10
   #define CRK_ALGORITHM_MAX       10 /* 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)
   #define CRF_MOD_ADD             (1 << CRK_MOD_ADD)
   #define CRF_MOD_ADDINV          (1 << CRK_MOD_ADDINV)
   #define CRF_MOD_SUB             (1 << CRK_MOD_SUB)
   #define CRF_MOD_MULT            (1 << CRK_MOD_MULT)
   #define CRF_MOD_MULTINV         (1 << CRK_MOD_MULTINV)
   #define CRF_MOD                 (1 << CRK_MOD)
   
   /*
    * A large comment here once held descriptions of the ioctl
    * requests implemented by the device.  This text has been moved
    * to the crypto(4) manual page and, later, removed from this file
    * as it was always a step behind the times.
    */
   
   /*
    * done against open of /dev/crypto, to get a cloned descriptor.
    * Please use F_SETFD against the cloned descriptor.  But this ioctl
    * is obsolete (the device now clones): please, just don't use it.
    */
   #define CRIOGET         _IOWR('c', 100, u_int32_t)
   
   /* the following are done against the cloned descriptor */
   #define CIOCFSESSION    _IOW('c', 102, u_int32_t)
   #define CIOCKEY         _IOWR('c', 104, struct crypt_kop)
   #define CIOCNFKEYM      _IOWR('c', 108, struct crypt_mkop)
   #define CIOCNFSESSION   _IOW('c', 109, struct crypt_sfop)
   #define CIOCNCRYPTRETM  _IOWR('c', 110, struct cryptret)
   #define CIOCNCRYPTRET   _IOWR('c', 111, struct crypt_result)
   
   #define CIOCGSESSION    _IOWR('c', 112, struct session_op)
   #define CIOCNGSESSION   _IOWR('c', 113, struct crypt_sgop)
   #define CIOCCRYPT       _IOWR('c', 114, struct crypt_op)
   #define CIOCNCRYPTM     _IOWR('c', 115, struct crypt_mop)
   
   #define CIOCASYMFEAT    _IOR('c', 105, u_int32_t)
   
   struct cryptotstat {
           struct timespec acc;            /* total accumulated time */
           struct timespec min;            /* max 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
   /* Standard initialization structure beginning */
   struct cryptoini {
           int             cri_alg;        /* Algorithm to use */
           int             cri_klen;       /* Key length, in bits */
           int             cri_rnd;        /* Algorithm rounds, where relevant */
           char           *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              0x10    /* Set when doing compression */
   
           struct cryptoini        CRD_INI; /* Initialization/context data */
   #define crd_iv          CRD_INI.cri_iv
   #define crd_key         CRD_INI.cri_key
   #define crd_rnd         CRD_INI.cri_rnd
   #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 */
           
           u_int32_t       crp_reqid;      /* request id */
           void *          crp_usropaque;  /* Opaque pointer from user, passed along */
   
           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;      /* Note: must hold mutext to modify */
   
   #define CRYPTO_F_IMBUF          0x0001  /* Input/output are mbuf chains */
   #define CRYPTO_F_IOV            0x0002  /* Input/output are uio */
   #define CRYPTO_F_REL            0x0004  /* Must return data in same place */
   #define CRYPTO_F_BATCH          0x0008  /* Batch op if possible 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_ONRETQ         0x0080  /* Request is on return queue */
   #define CRYPTO_F_USER           0x0100  /* Request is in user context */
   #define CRYPTO_F_MORE           0x0200  /* more data to follow */
   
           void *          crp_buf;        /* Data to be processed */
           void *          crp_opaque;     /* Opaque pointer, passed along */
           struct cryptodesc *crp_desc;    /* Linked list of processing descriptors */
   
           int (*crp_callback)(struct cryptop *); /* Callback function */
   
           void *          crp_mac;
           struct timespec crp_tstamp;     /* performance time stamp */
           kcondvar_t      crp_cv;
           struct fcrypt   *fcrp;
           void *          dst;
           void *          mac;
           u_int           len;
           u_char          tmp_iv[EALG_MAX_BLOCK_LEN];
           u_char          tmp_mac[CRYPTO_MAX_MAC_LEN];
           
           struct iovec    iovec[1];
           struct uio      uio;
           uint32_t        magic;
   };
   
   #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_int32_t       krp_reqid;      /* request id */
           void *          krp_usropaque;  /* Opaque pointer from user, passed along */
   
           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_int32_t       krp_hid;
           struct crparam  krp_param[CRK_MAXPARAM];        /* kvm */
           int             (*krp_callback)(struct cryptkop *);
           int             krp_flags;      /* same values as crp_flags */
           kcondvar_t      krp_cv;
           struct fcrypt   *fcrp;
           struct crparam  crk_param[CRK_MAXPARAM];
   };
   
   /* Crypto capabilities structure */
   struct cryptocap {
           u_int32_t       cc_sessions;
   
           /*
            * Largest possible operator length (in bits) for each type of
            * encryption algorithm.
            */
           u_int16_t       cc_max_op_len[CRYPTO_ALGORITHM_MAX + 1];
   
           u_int8_t        cc_alg[CRYPTO_ALGORITHM_MAX + 1];
   
           u_int8_t        cc_kalg[CRK_ALGORITHM_MAX + 1];
   
           u_int8_t        cc_flags;
           u_int8_t        cc_qblocked;            /* symmetric q blocked */
           u_int8_t        cc_kqblocked;           /* asymmetric q blocked */
   #define CRYPTOCAP_F_CLEANUP     0x01            /* needs resource cleanup */
   #define CRYPTOCAP_F_SOFTWARE    0x02            /* software implementation */
   #define CRYPTOCAP_F_SYNC        0x04            /* operates synchronously */
   
           void            *cc_arg;                /* callback argument */
           int             (*cc_newsession)(void*, u_int32_t*, struct cryptoini*);
           int             (*cc_process) (void*, struct cryptop *, int);
           int             (*cc_freesession) (void*, u_int64_t);
           void            *cc_karg;               /* callback argument */
           int             (*cc_kprocess) (void*, struct cryptkop *, int);
   };
   
   /*
    * 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) & 0xffffff)
   #define CRYPTO_SESID2CAPS(_sid) (((_sid) >> 56) & 0xff)
   #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);
   extern  int32_t crypto_get_driverid(u_int32_t flags);
   extern  int crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
               u_int32_t flags,
               int (*newses)(void*, u_int32_t*, struct cryptoini*),
               int (*freeses)(void*, u_int64_t),
               int (*process)(void*, struct cryptop *, int),
               void *arg);
   extern  int crypto_kregister(u_int32_t, int, u_int32_t,
               int (*)(void*, struct cryptkop *, int),
               void *arg);
   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 *);
   
   void    cuio_copydata(struct uio *, int, int, void *);
   void    cuio_copyback(struct uio *, int, int, void *);
   int     cuio_apply(struct uio *, int, int,
               int (*f)(void *, void *, unsigned int), void *);
   
   extern  int crypto_ret_q_remove(struct cryptop *);
   extern  int crypto_ret_kq_remove(struct cryptkop *);
   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 */
   
   /*
    * Asymmetric operations are allocated in cryptodev.c but can be
    * freed in crypto.c.
    */
   extern struct pool      cryptkop_pool;
   
   /*
    * Mutual exclusion and its unwelcome friends.
    */
   
   extern  kmutex_t        crypto_mtx;
   
   /*
    * initialize the crypto framework subsystem (not the pseudo-device).
    * This must be called very early in boot, so the framework is ready
    * to handle registration requests when crpto hardware is autoconfigured.
    * (This declaration doesnt really belong here but there's no header
    * for the raw framework.)
    */
   void    crypto_init(void);
   
   /*
    * 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 mbuf;
   struct  mbuf    *m_getptr(struct mbuf *, int, int *);
   
   struct uio;
   extern  void cuio_copydata(struct uio* uio, int off, int len, void *cp);
   extern  void cuio_copyback(struct uio* uio, int off, int len, void *cp);
   extern int      cuio_getptr(struct uio *, int loc, int *off);
   
   #ifdef CRYPTO_DEBUG     /* yuck, netipsec defines these differently */
   #ifndef DPRINTF
   #define DPRINTF(a) uprintf a
   #endif
   #ifndef DCPRINTF
   #define DCPRINTF(a) printf a
   #endif
   #else
   #ifndef DPRINTF
   #define DPRINTF(a)
   #endif
   #ifndef DCPRINTF
   #define DCPRINTF(a)
   #endif
   #endif
   
   #endif /* _KERNEL */
   #endif /* _CRYPTO_CRYPTO_H_ */

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