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// -*-c++-*-
/* $Id: srp.h,v 1.19 2004/05/12 08:42:38 dm Exp $ */
/*
*
* Copyright (C) 1999 David Mazieres (dm@uun.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _SRP_H_
#define _SRP_H_ 1
#include "bigint.h"
#include "sha1.h"
#include "blowfish.h"
typedef rpc_opaque<20> srp_hash;
typedef rpc_bytes<RPC_INFINITY> srpmsg;
enum srpres { SRP_FAIL, SRP_NEXT, SRP_SETPWD, SRP_LAST, SRP_DONE };
class srp_base {
protected:
str salt;
bigint A;
bigint B;
srp_hash M;
srp_hash H;
static bigint k1;
static bigint k3;
bigint *k;
void setparam (const bigint &NN, const bigint &gg) { N = NN; g = gg; }
bool checkparam (u_int iter = 32)
{ if (checkparam (N, g, iter)) return true; N = g = 0; return false; }
bool setS (const bigint &S);
struct paramcache {
bigint N;
u_int iter;
paramcache () : iter (0) {}
};
enum { cachesize = 2 };
static paramcache cache[cachesize];
static int lastpos;
public:
srp_hash sessid;
str user;
static u_int minprimsize;
bigint S;
bigint N;
bigint g;
static bool checkparam (const bigint &N, const bigint &g, u_int iter = 32);
static bool seedparam (const bigint &N, const bigint &g, u_int iter = 1);
static void genparam (size_t nbits, bigint *Np, bigint *gp);
};
class srp_client : public srp_base {
int phase;
bigint x;
bigint a;
srpres phase1a (srpmsg *msgout, const srpmsg *in);
srpres phase1b (srpmsg *msgout, const srpmsg *in);
srpres phase3 (srpmsg *msgout, const srpmsg *in);
srpres phase5 (srpmsg *msgout, const srpmsg *in);
public:
str pwd;
str host;
bool host_ok;
u_int cost;
eksblowfish eksb;
srp_client () : phase (-1), host_ok (false) {}
void setpwd (const str &p) { pwd = p; }
str getname () const
{ return strbuf () << user << "@" << host << "/" << N.nbits (); }
srpres init (srpmsg *msgout, const srp_hash &sessid,
str user, str pwd = NULL, int version = 6);
srpres next (srpmsg *msgout, const srpmsg *in);
str create (const bigint &N, const bigint &g,
str pwd, str host, u_int cost, u_int iter = 32);
};
class srp_server : public srp_base {
int phase;
bigint v;
bigint b;
bigint u;
srpres phase2 (srpmsg *msgout, const srpmsg *msgin);
srpres phase4 (srpmsg *msgout, const srpmsg *msgin);
public:
srp_server () : phase (-1) {}
srpres init (srpmsg *msgout, const srpmsg *msgin,
const srp_hash &sessid, str user, str info, int version = 6);
srpres next (srpmsg *msgout, const srpmsg *msgin);
static bool sane (str info);
};
bool import_srp_params (str raw, bigint *Np, bigint *gp);
str export_srp_params (const bigint &N, const bigint &g);
#endif /* !_SRP_H_ */
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