/*
  *  OpenVPN -- An application to securely tunnel IP networks
  *             over a single TCP/UDP port, with support for SSL/TLS-based
  *             session authentication and key exchange,
  *             packet encryption, packet authentication, and
  *             packet compression.
  *

  *  Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>

  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
  *  as published by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *

  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */
 
 #if PROXY_DIGEST_AUTH
 
 #define HASHLEN 16
 typedef unsigned char HASH[HASHLEN];
 #define HASHHEXLEN 32
 typedef unsigned char HASHHEX[HASHHEXLEN+1];
 #undef IN
 #undef OUT
 #define IN const
 #define OUT
 
 /* calculate H(A1) as per HTTP Digest spec */
 void DigestCalcHA1(

     IN char *pszAlg,
     IN char *pszUserName,
     IN char *pszRealm,
     IN char *pszPassword,
     IN char *pszNonce,
     IN char *pszCNonce,

     OUT HASHHEX SessionKey
     );
 
 /* calculate request-digest/response-digest as per HTTP Digest spec */
 void DigestCalcResponse(
     IN HASHHEX HA1,           /* H(A1) */

     IN char *pszNonce,        /* nonce from server */
     IN char *pszNonceCount,   /* 8 hex digits */
     IN char *pszCNonce,       /* client nonce */
     IN char *pszQop,          /* qop-value: "", "auth", "auth-int" */
     IN char *pszMethod,       /* method from the request */
     IN char *pszDigestUri,    /* requested URL */

     IN HASHHEX HEntity,       /* H(entity body) if qop="auth-int" */
     OUT HASHHEX Response      /* request-digest or response-digest */
     );
 

 #endif /* if PROXY_DIGEST_AUTH */