269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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RCSID("$Id: otp_md.c,v 1.1.1.2 2000/12/29 01:43:49 assar Exp $");
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#endif
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#include "otp_locl.h"
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#include "otp_md.h"
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#include <md4.h>
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#include <md5.h>
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#include <sha.h>
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/*
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* Compress len bytes from md into key
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*/
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static void
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compressmd (OtpKey key, unsigned char *md, size_t len)
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{
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u_char *p = key;
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memset (p, 0, OTPKEYSIZE);
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while(len) {
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*p++ ^= *md++;
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*p++ ^= *md++;
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*p++ ^= *md++;
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*p++ ^= *md++;
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len -= 4;
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if (p == key + OTPKEYSIZE)
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p = key;
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}
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}
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static int
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otp_md_init (OtpKey key,
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char *pwd,
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char *seed,
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void (*init)(void *),
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void (*update)(void *, void *, size_t),
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void (*finito)(void *, void *),
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void *arg,
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unsigned char *res,
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size_t ressz)
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{
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char *p;
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int len;
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len = strlen(pwd) + strlen(seed);
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p = malloc (len + 1);
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if (p == NULL)
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return -1;
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strcpy (p, seed);
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strlwr (p);
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strcat (p, pwd);
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(*init)(arg);
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(*update)(arg, p, len);
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(*finito)(arg, res);
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free (p);
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compressmd (key, res, ressz);
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return 0;
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}
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static int
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otp_md_next (OtpKey key,
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void (*init)(void *),
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void (*update)(void *, void *, size_t),
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void (*finito)(void *, void *),
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void *arg,
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unsigned char *res,
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size_t ressz)
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{
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(*init)(arg);
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(*update)(arg, key, OTPKEYSIZE);
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(*finito)(arg, res);
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compressmd (key, res, ressz);
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return 0;
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}
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static int
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otp_md_hash (char *data,
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size_t len,
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void (*init)(void *),
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void (*update)(void *, void *, size_t),
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void (*finito)(void *, void *),
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void *arg,
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unsigned char *res,
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size_t ressz)
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{
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(*init)(arg);
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(*update)(arg, data, len);
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(*finito)(arg, res);
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return 0;
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}
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int
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otp_md4_init (OtpKey key, char *pwd, char *seed)
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{
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unsigned char res[16];
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struct md4 md4;
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return otp_md_init (key, pwd, seed,
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(void (*)(void *))md4_init,
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(void (*)(void *, void *, size_t))md4_update,
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(void (*)(void *, void *))md4_finito,
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&md4, res, sizeof(res));
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}
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int
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otp_md4_hash (char *data,
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size_t len,
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unsigned char *res)
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{
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struct md4 md4;
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return otp_md_hash (data, len,
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(void (*)(void *))md4_init,
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(void (*)(void *, void *, size_t))md4_update,
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(void (*)(void *, void *))md4_finito,
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&md4, res, 16);
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}
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int
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otp_md4_next (OtpKey key)
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{
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unsigned char res[16];
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struct md4 md4;
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return otp_md_next (key,
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(void (*)(void *))md4_init,
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(void (*)(void *, void *, size_t))md4_update,
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(void (*)(void *, void *))md4_finito,
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&md4, res, sizeof(res));
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}
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int
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otp_md5_init (OtpKey key, char *pwd, char *seed)
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{
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unsigned char res[16];
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struct md5 md5;
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return otp_md_init (key, pwd, seed,
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(void (*)(void *))md5_init,
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(void (*)(void *, void *, size_t))md5_update,
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(void (*)(void *, void *))md5_finito,
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&md5, res, sizeof(res));
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}
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int
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otp_md5_hash (char *data,
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size_t len,
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unsigned char *res)
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{
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struct md5 md5;
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return otp_md_hash (data, len,
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(void (*)(void *))md5_init,
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(void (*)(void *, void *, size_t))md5_update,
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(void (*)(void *, void *))md5_finito,
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&md5, res, 16);
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}
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int
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otp_md5_next (OtpKey key)
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{
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unsigned char res[16];
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struct md5 md5;
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return otp_md_next (key,
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(void (*)(void *))md5_init,
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(void (*)(void *, void *, size_t))md5_update,
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(void (*)(void *, void *))md5_finito,
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&md5, res, sizeof(res));
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}
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/*
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* For histerical reasons, in the OTP definition it's said that the
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* result from SHA must be stored in little-endian order. See
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* draft-ietf-otp-01.txt.
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*/
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static void
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sha_finito_little_endian (struct sha *m, void *res)
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{
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unsigned char tmp[20];
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unsigned char *p = res;
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int j;
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sha_finito (m, tmp);
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for (j = 0; j < 20; j += 4) {
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p[j] = tmp[j+3];
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p[j+1] = tmp[j+2];
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p[j+2] = tmp[j+1];
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p[j+3] = tmp[j];
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}
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}
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int
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otp_sha_init (OtpKey key, char *pwd, char *seed)
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{
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unsigned char res[20];
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struct sha sha;
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return otp_md_init (key, pwd, seed,
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(void (*)(void *))sha_init,
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(void (*)(void *, void *, size_t))sha_update,
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(void (*)(void *, void *))sha_finito_little_endian,
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&sha, res, sizeof(res));
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}
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int
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otp_sha_hash (char *data,
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size_t len,
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unsigned char *res)
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{
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struct sha sha;
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return otp_md_hash (data, len,
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(void (*)(void *))sha_init,
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(void (*)(void *, void *, size_t))sha_update,
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(void (*)(void *, void *))sha_finito_little_endian,
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&sha, res, 20);
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}
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int
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otp_sha_next (OtpKey key)
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{
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unsigned char res[20];
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struct sha sha;
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return otp_md_next (key,
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(void (*)(void *))sha_init,
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(void (*)(void *, void *, size_t))sha_update,
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(void (*)(void *, void *))sha_finito_little_endian,
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&sha, res, sizeof(res));
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}
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