crypto/openssh/dh.h

   1 /* $OpenBSD: dh.h,v 1.15 2016/05/02 10:26:04 djm 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 struct dhgroup {
  30         int size;
  31         BIGNUM *g;
  32         BIGNUM *p;
  33 };
  34
  35 DH      *choose_dh(int, int, int);
  36 DH      *dh_new_group_asc(const char *, const char *);
  37 DH      *dh_new_group(BIGNUM *, BIGNUM *);
  38 DH      *dh_new_group1(void);
  39 DH      *dh_new_group14(void);
  40 DH      *dh_new_group16(void);
  41 DH      *dh_new_group18(void);
  42 DH      *dh_new_group_fallback(int);
  43
  44 int      dh_gen_key(DH *, int);
  45 int      dh_pub_is_valid(DH *, BIGNUM *);
  46
  47 u_int    dh_estimate(int);
  48
  49 /*
  50  * Max value from RFC4419.
  51  * Miniumum increased in light of DH precomputation attacks.
  52  */
  53 #define DH_GRP_MIN      2048
  54 #define DH_GRP_MAX      8192
  55
  56 /*
  57  * Values for "type" field of moduli(5)
  58  * Specifies the internal structure of the prime modulus.
  59  */
  60 #define MODULI_TYPE_UNKNOWN             (0)
  61 #define MODULI_TYPE_UNSTRUCTURED        (1)
  62 #define MODULI_TYPE_SAFE                (2)
  63 #define MODULI_TYPE_SCHNORR             (3)
  64 #define MODULI_TYPE_SOPHIE_GERMAIN      (4)
  65 #define MODULI_TYPE_STRONG              (5)
  66
  67 /*
  68  * Values for "tests" field of moduli(5)
  69  * Specifies the methods used in checking for primality.
  70  * Usually, more than one test is used.
  71  */
  72 #define MODULI_TESTS_UNTESTED           (0x00)
  73 #define MODULI_TESTS_COMPOSITE          (0x01)
  74 #define MODULI_TESTS_SIEVE              (0x02)
  75 #define MODULI_TESTS_MILLER_RABIN       (0x04)
  76 #define MODULI_TESTS_JACOBI             (0x08)
  77 #define MODULI_TESTS_ELLIPTIC           (0x10)
  78
  79
  80 #endif