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      1 /*	$NetBSD: dh.h,v 1.2 2017/01/28 21:31:47 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * Id
     38  */
     39 
     40 #ifndef _HEIM_DH_H
     41 #define _HEIM_DH_H 1
     42 
     43 /* symbol renaming */
     44 #define DH hc_DH
     45 #define DH_METHOD hc_DH_METHOD
     46 #define DH_null_method hc_DH_null_method
     47 #define DH_tfm_method hc_DH_tfm_method
     48 #define DH_ltm_method hc_DH_ltm_method
     49 #define DH_new hc_DH_new
     50 #define DH_new_method hc_DH_new_method
     51 #define DH_free hc_DH_free
     52 #define DH_up_ref hc_DH_up_ref
     53 #define DH_size hc_DH_size
     54 #define DH_set_default_method hc_DH_set_default_method
     55 #define DH_get_default_method hc_DH_get_default_method
     56 #define DH_set_method hc_DH_set_method
     57 #define DH_get_method hc_DH_get_method
     58 #define DH_set_ex_data hc_DH_set_ex_data
     59 #define DH_get_ex_data hc_DH_get_ex_data
     60 #define DH_generate_parameters_ex hc_DH_generate_parameters_ex
     61 #define DH_check_pubkey hc_DH_check_pubkey
     62 #define DH_generate_key hc_DH_generate_key
     63 #define DH_compute_key hc_DH_compute_key
     64 #define	i2d_DHparams hc_i2d_DHparams
     65 
     66 /*
     67  *
     68  */
     69 
     70 typedef struct DH DH;
     71 typedef struct DH_METHOD DH_METHOD;
     72 
     73 #include <hcrypto/bn.h>
     74 #include <hcrypto/engine.h>
     75 
     76 struct DH_METHOD {
     77     const char *name;
     78     int (*generate_key)(DH *);
     79     int (*compute_key)(unsigned char *,const BIGNUM *,DH *);
     80     int (*bn_mod_exp)(const DH *, BIGNUM *, const BIGNUM *,
     81 		      const BIGNUM *, const BIGNUM *, BN_CTX *,
     82 		      BN_MONT_CTX *);
     83     int (*init)(DH *);
     84     int (*finish)(DH *);
     85     int flags;
     86     void *app_data;
     87     int (*generate_params)(DH *, int, int, BN_GENCB *);
     88 };
     89 
     90 struct DH {
     91     int pad;
     92     int version;
     93     BIGNUM *p;
     94     BIGNUM *g;
     95     long length;
     96     BIGNUM *pub_key;
     97     BIGNUM *priv_key;
     98     int flags;
     99     void *method_mont_p;
    100     BIGNUM *q;
    101     BIGNUM *j;
    102     void *seed;
    103     int seedlen;
    104     BIGNUM *counter;
    105     int references;
    106     struct CRYPTO_EX_DATA {
    107 	void *sk;
    108 	int dummy;
    109     } ex_data;
    110     const DH_METHOD *meth;
    111     ENGINE *engine;
    112 };
    113 
    114 /* DH_check_pubkey return codes in `codes' argument. */
    115 #define DH_CHECK_PUBKEY_TOO_SMALL 1
    116 #define DH_CHECK_PUBKEY_TOO_LARGE 2
    117 
    118 /*
    119  *
    120  */
    121 
    122 const DH_METHOD *DH_null_method(void);
    123 const DH_METHOD *DH_tfm_method(void);
    124 const DH_METHOD *DH_ltm_method(void);
    125 
    126 DH *	DH_new(void);
    127 DH *	DH_new_method(ENGINE *);
    128 void	DH_free(DH *);
    129 int	DH_up_ref(DH *);
    130 
    131 int	DH_size(const DH *);
    132 
    133 
    134 void	DH_set_default_method(const DH_METHOD *);
    135 const DH_METHOD *
    136 	DH_get_default_method(void);
    137 int	DH_set_method(DH *, const DH_METHOD *);
    138 
    139 int	DH_set_ex_data(DH *, int, void *);
    140 void *	DH_get_ex_data(DH *, int);
    141 
    142 int	DH_generate_parameters_ex(DH *, int, int, BN_GENCB *);
    143 int	DH_check_pubkey(const DH *, const BIGNUM *, int *);
    144 int	DH_generate_key(DH *);
    145 int	DH_compute_key(unsigned char *,const BIGNUM *,DH *);
    146 
    147 int	i2d_DHparams(DH *, unsigned char **);
    148 
    149 #endif /* _HEIM_DH_H */
    150 
    151