crypto/openssh/dh.h

   1 /* $OpenBSD: dh.h,v 1.19 2021/03/12 04:08:19 dtucker Exp $ */
   2
   3 /*
   4  * Copyright (c) 2000 Niels Provos.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 #ifndef DH_H
  27 #define DH_H
  28
  29 #ifdef WITH_OPENSSL
  30
  31 struct dhgroup {
  32         int size;
  33         BIGNUM *g;
  34         BIGNUM *p;
  35 };
  36
  37 DH      *choose_dh(int, int, int);
  38 DH      *dh_new_group_asc(const char *, const char *);
  39 DH      *dh_new_group(BIGNUM *, BIGNUM *);
  40 DH      *dh_new_group1(void);
  41 DH      *dh_new_group14(void);
  42 DH      *dh_new_group16(void);
  43 DH      *dh_new_group18(void);
  44 DH      *dh_new_group_fallback(int);
  45
  46 int      dh_gen_key(DH *, int);
  47 int      dh_pub_is_valid(const DH *, const BIGNUM *);
  48
  49 u_int    dh_estimate(int);
  50 void     dh_set_moduli_file(const char *);
  51
  52 /*
  53  * Max value from RFC4419.
  54  * Min value from RFC8270.
  55  */
  56 #define DH_GRP_MIN      2048
  57 #define DH_GRP_MAX      8192
  58
  59 /*
  60  * Values for "type" field of moduli(5)
  61  * Specifies the internal structure of the prime modulus.
  62  */
  63 #define MODULI_TYPE_UNKNOWN             (0)
  64 #define MODULI_TYPE_UNSTRUCTURED        (1)
  65 #define MODULI_TYPE_SAFE                (2)
  66 #define MODULI_TYPE_SCHNORR             (3)
  67 #define MODULI_TYPE_SOPHIE_GERMAIN      (4)
  68 #define MODULI_TYPE_STRONG              (5)
  69
  70 /*
  71  * Values for "tests" field of moduli(5)
  72  * Specifies the methods used in checking for primality.
  73  * Usually, more than one test is used.
  74  */
  75 #define MODULI_TESTS_UNTESTED           (0x00)
  76 #define MODULI_TESTS_COMPOSITE          (0x01)
  77 #define MODULI_TESTS_SIEVE              (0x02)
  78 #define MODULI_TESTS_MILLER_RABIN       (0x04)
  79 #define MODULI_TESTS_JACOBI             (0x08)
  80 #define MODULI_TESTS_ELLIPTIC           (0x10)
  81
  82 #endif /* WITH_OPENSSL */
  83
  84 #endif /* DH_H */