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/*
* Copyright (c) 1997-1999 The Stanford SRP Authentication Project
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
* THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* In addition, the following conditions apply:
*
* 1. Any software that incorporates the SRP authentication technology
* must display the following acknowlegment:
* "This product uses the 'Secure Remote Password' cryptographic
* authentication system developed by Tom Wu (tjw@CS.Stanford.EDU)."
*
* 2. Any software that incorporates all or part of the SRP distribution
* itself must also display the following acknowledgment:
* "This product includes software developed by Tom Wu and Eugene
* Jhong for the SRP Distribution (http://srp.stanford.edu/srp/)."
*
* 3. Redistributions in source or binary form must retain an intact copy
* of this copyright notice and list of conditions.
*/
#include <stdio.h>
#include "t_defines.h"
#include "t_pwd.h"
#include "t_client.h"
int
main()
{
int index;
struct t_client * tc;
struct t_preconf *tcp;
struct t_num s;
struct t_num B;
char username[MAXUSERLEN];
char hexbuf[MAXHEXPARAMLEN];
char buf1[MAXPARAMLEN], buf2[MAXPARAMLEN], buf3[MAXSALTLEN];
unsigned char cbuf[20];
struct t_num * A;
unsigned char * skey;
char pass[128];
printf("Enter username: ");
fgets(username, sizeof(username), stdin);
username[strlen(username) - 1] = '\0';
printf("Enter index (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
index = atoi(hexbuf);
tcp = t_getpreparam(index - 1);
printf("Enter salt (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
s.data = buf3;
s.len = t_fromb64(s.data, hexbuf);
tc = t_clientopen(username, &tcp->modulus, &tcp->generator, &s);
if (tc == 0) {
printf("invalid n, g\n");
exit(1);
}
A = t_clientgenexp(tc);
printf("A (to server): %s\n", t_tob64(hexbuf, A->data, A->len));
t_getpass(pass, 128, "Enter password:");
t_clientpasswd(tc, pass);
printf("Enter B (from server): ");
fgets(hexbuf, sizeof(hexbuf), stdin);
B.data = buf1;
B.len = t_fromb64(B.data, hexbuf);
skey = t_clientgetkey(tc, &B);
printf("Session key: %s\n", t_tohex(hexbuf, skey, 40));
printf("Response (to server): %s\n",
t_tohex(hexbuf, t_clientresponse(tc), RESPONSE_LEN));
printf("Enter server response: ");
fgets(hexbuf, sizeof(hexbuf), stdin);
hexbuf[strlen(hexbuf) - 1] = '\0';
t_fromhex(cbuf, hexbuf);
if (t_clientverify(tc, cbuf) == 0)
printf("Server authentication successful.\n");
else
printf("Server authentication failed.\n");
t_clientclose(tc);
return 0;
}
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