+++ /dev/null
-/*
- * 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_server.h"
-
-_TYPE( struct t_server * )
-t_serveropenraw(ent, tce)
- struct t_pwent * ent;
- struct t_confent * tce;
-{
- struct t_server * ts;
- unsigned char buf1[SHA_DIGESTSIZE], buf2[SHA_DIGESTSIZE];
- SHA1_CTX ctxt;
- int i;
-
- if((ts = malloc(sizeof(struct t_server))) == 0)
- return 0;
-
- SHA1Init(&ts->ckhash);
-
- ts->index = ent->index;
- ts->n.len = tce->modulus.len;
- ts->n.data = ts->nbuf;
- memcpy(ts->n.data, tce->modulus.data, ts->n.len);
-
- SHA1Init(&ctxt);
- SHA1Update(&ctxt, ts->n.data, ts->n.len);
- SHA1Final(buf1, &ctxt);
-
- ts->g.len = tce->generator.len;
- ts->g.data = ts->gbuf;
- memcpy(ts->g.data, tce->generator.data, ts->g.len);
-
- SHA1Init(&ctxt);
- SHA1Update(&ctxt, ts->g.data, ts->g.len);
- SHA1Final(buf2, &ctxt);
-
- for(i = 0; i < sizeof(buf1); ++i)
- buf1[i] ^= buf2[i];
-
- SHA1Update(&ts->ckhash, buf1, sizeof(buf1));
-
- SHA1Init(&ctxt);
- SHA1Update(&ctxt, ent->name, strlen(ent->name));
- SHA1Final(buf1, &ctxt);
-
- SHA1Update(&ts->ckhash, buf1, sizeof(buf1));
-
- ts->v.len = ent->password.len;
- ts->v.data = ts->vbuf;
- memcpy(ts->v.data, ent->password.data, ts->v.len);
-
- ts->s.len = ent->salt.len;
- ts->s.data = ts->saltbuf;
- memcpy(ts->s.data, ent->salt.data, ts->s.len);
-
- SHA1Update(&ts->ckhash, ts->s.data, ts->s.len);
-
- ts->b.data = ts->bbuf;
- ts->B.data = ts->Bbuf;
-
- SHA1Init(&ts->hash);
- SHA1Init(&ts->oldhash);
- SHA1Init(&ts->oldckhash);
-
- return ts;
-}
-
-_TYPE( struct t_num * )
-t_servergenexp(ts)
- struct t_server * ts;
-{
- BigInteger b, B, v, n, g;
-
- if(ts->n.len < BLEN)
- ts->b.len = ts->n.len;
- else
- ts->b.len = BLEN;
-
- t_random(ts->b.data, ts->b.len);
- b = BigIntegerFromBytes(ts->b.data, ts->b.len);
- n = BigIntegerFromBytes(ts->n.data, ts->n.len);
- g = BigIntegerFromBytes(ts->g.data, ts->g.len);
- B = BigIntegerFromInt(0);
- BigIntegerModExp(B, g, b, n);
-
- v = BigIntegerFromBytes(ts->v.data, ts->v.len);
- BigIntegerAdd(B, B, v);
- if(BigIntegerCmp(B, n) > 0)
- BigIntegerSub(B, B, n);
-
- ts->B.len = BigIntegerToBytes(B, ts->B.data);
-
- BigIntegerFree(v);
- BigIntegerFree(B);
- BigIntegerFree(b);
- BigIntegerFree(g);
- BigIntegerFree(n);
-
- SHA1Update(&ts->oldckhash, ts->B.data, ts->B.len);
-
- return &ts->B;
-}
-
-_TYPE( unsigned char * )
-t_servergetkey(ts, clientval)
- struct t_server * ts;
- struct t_num * clientval;
-{
- BigInteger n, v, A, b, prod, res, S;
- SHA1_CTX ctxt;
- unsigned char sbuf[MAXPARAMLEN];
- unsigned char dig[SHA_DIGESTSIZE];
- unsigned slen;
- unsigned int u;
-
- SHA1Update(&ts->ckhash, clientval->data, clientval->len);
- SHA1Update(&ts->ckhash, ts->B.data, ts->B.len);
-
- SHA1Init(&ctxt);
- SHA1Update(&ctxt, ts->B.data, ts->B.len);
- SHA1Final(dig, &ctxt);
- u = (dig[0] << 24) | (dig[1] << 16) | (dig[2] << 8) | dig[3];
-
- SHA1Update(&ts->oldhash, clientval->data, clientval->len);
- SHA1Update(&ts->hash, clientval->data, clientval->len);
-
- n = BigIntegerFromBytes(ts->n.data, ts->n.len);
- b = BigIntegerFromBytes(ts->b.data, ts->b.len);
- v = BigIntegerFromBytes(ts->v.data, ts->v.len);
- A = BigIntegerFromBytes(clientval->data, clientval->len);
-
- prod = BigIntegerFromInt(0);
- BigIntegerModExpInt(prod, v, u, n);
- res = BigIntegerFromInt(0);
- BigIntegerModMul(res, prod, A, n);
-
- BigIntegerFree(A);
- BigIntegerFree(v);
- BigIntegerFree(prod);
-
- if(BigIntegerCmpInt(res, 1) <= 0) { /* Check for Av^u == 1 (mod n) */
- BigIntegerFree(res);
- BigIntegerFree(b);
- BigIntegerFree(n);
- return NULL;
- }
-
- S = BigIntegerFromInt(0);
-
- BigIntegerAddInt(S, res, 1);
- if(BigIntegerCmp(S, n) == 0) { /* Check for Av^u == -1 (mod n) */
- BigIntegerFree(res);
- BigIntegerFree(b);
- BigIntegerFree(n);
- BigIntegerFree(S);
- return NULL;
- }
-
- BigIntegerModExp(S, res, b, n);
- slen = BigIntegerToBytes(S, sbuf);
-
- BigIntegerFree(S);
- BigIntegerFree(res);
- BigIntegerFree(b);
- BigIntegerFree(n);
-
- t_sessionkey(ts->session_key, sbuf, slen);
- memset(sbuf, 0, slen);
-
- SHA1Update(&ts->oldhash, ts->session_key, sizeof(ts->session_key));
- SHA1Update(&ts->oldckhash, ts->session_key, sizeof(ts->session_key));
- SHA1Update(&ts->ckhash, ts->session_key, sizeof(ts->session_key));
-
- return ts->session_key;
-}
-
-_TYPE( int )
-t_serververify(ts, resp)
- struct t_server * ts;
- unsigned char * resp;
-{
- unsigned char expected[SHA_DIGESTSIZE];
- int i;
-
- SHA1Final(expected, &ts->oldckhash);
- i = memcmp(expected, resp, sizeof(expected));
- if(i == 0) {
- SHA1Final(ts->session_response, &ts->oldhash);
- return 0;
- }
- SHA1Final(expected, &ts->ckhash);
- i = memcmp(expected, resp, sizeof(expected));
- if(i == 0) {
- SHA1Update(&ts->hash, expected, sizeof(expected));
- SHA1Update(&ts->hash, ts->session_key, sizeof(ts->session_key));
- SHA1Final(ts->session_response, &ts->hash);
- }
- return i;
-}
-
-_TYPE( unsigned char * )
-t_serverresponse(ts)
- struct t_server * ts;
-{
- return ts->session_response;
-}
-
-_TYPE( void )
-t_serverclose(ts)
- struct t_server * ts;
-{
- memset(ts->bbuf, 0, sizeof(ts->bbuf));
- memset(ts->vbuf, 0, sizeof(ts->vbuf));
- memset(ts->saltbuf, 0, sizeof(ts->saltbuf));
- memset(ts->session_key, 0, sizeof(ts->session_key));
- free(ts);
-}
projects / openwrt / openwrt.git / blobdiff