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/* $Id: password.C,v 1.6 2002/09/28 21:28:15 max 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
*
*/
#include "crypt.h"
#include "password.h"
#include "rxx.h"
#include "parseopt.h"
inline void
hashptext (char *dst, size_t dstlen, const str &src)
{
sha1oracle ora (dstlen);
ora.update (src.cstr (), src.len ());
ora.final (reinterpret_cast<u_char *> (dst));
}
str
pw_armorsalt (u_int cost, str bsalt, str ptext)
{
return strbuf ("%d$", cost) << armor64 (bsalt) << "$" << ptext;
}
#define A64STR "[A-Za-z0-9+/]+={0,2}"
static rxx saltrx ("^(\\d+)\\$(" A64STR ")\\$(.*)$");
bool
pw_dearmorsalt (u_int *costp, str *bsaltp, str *ptextp, str armor)
{
if (!(armor / saltrx))
return false;
str s = dearmor64 (saltrx[2]);
if (!s)
return false;
if (bsaltp)
*bsaltp = s;
if (costp)
*costp = strtoi64 (saltrx[1]);
if (ptextp)
*ptextp = saltrx[3];
return true;
}
str
pw_dorawcrypt (str ptext, size_t outsize, eksblowfish *eksb)
{
wmstr m (outsize + 7 & ~7);
hashptext (m, m.len (), ptext);
cbc64iv iv (*eksb);
for (int i = 0; i < 64; i++) {
iv.setiv (0, 0);
iv.encipher_bytes (m, m.len ());
}
return m;
}
str
pw_rawcrypt (u_int cost, str pwd, str bsalt,
str ptext, size_t outsize, eksblowfish *eksb)
{
u_int maxlen = 56;
if (!outsize)
outsize = ptext.len ();
eksblowfish *eksbdel = NULL;
if (!eksb)
eksbdel = eksb = New eksblowfish;
if (pwd.len () > maxlen) {
char hsh[2 * sha1::hashsize];
sha1_hash (reinterpret_cast <u_char *> (hsh), pwd.cstr (), pwd.len ());
sha1_hash (reinterpret_cast <u_char *> (hsh + sha1::hashsize),
str (hsh, sha1::hashsize), sha1::hashsize);
pwd = str (hsh, (2*sha1::hashsize < maxlen) ? 2*sha1::hashsize : maxlen);
}
eksb->eksetkey (cost, pwd.cstr (), pwd.len (), bsalt.cstr (), bsalt.len ());
str ret = pw_dorawcrypt (ptext, outsize, eksb);
delete eksbdel;
return ret;
}
str
pw_gensalt (u_int cost, str ptext)
{
mstr m (16);
rnd.getbytes (m, m.len ());
str bsalt (m);
return pw_armorsalt (cost, bsalt, ptext);
}
str
pw_getptext (str salt)
{
if (salt / saltrx)
return saltrx[3];
return NULL;
}
str
pw_crypt (str pwd, str salt, size_t outsize, eksblowfish *eksb)
{
u_int cost;
str bsalt, ptext;
if (!pw_dearmorsalt (&cost, &bsalt, &ptext, salt))
return NULL;
return pw_rawcrypt (cost, pwd, bsalt, ptext, outsize, eksb);
}
bigint
pw_getint (str pwd, str salt, size_t nbits, eksblowfish *eksb)
{
str raw = pw_crypt (pwd, salt, nbits + 7 >> 3, eksb);
if (!raw)
return 0;
bigint res;
mpz_set_rawmag_le (&res, raw.cstr (), raw.len ());
res.trunc (nbits);
return res;
}
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