yktoken.c

/* ykparse.c --- Implementation of YubiKey token parser.
 *
 * Written by Simon Josefsson <simon@josefsson.org>.
 * Copyright (c) 2006-2012 Yubico AB
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *    * Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "yubikey.h"

#include <stdlib.h>

void
yubikey_parse (const uint8_t token[32],
	       const uint8_t key[16], yubikey_token_t out)
{
  memset (out, 0, sizeof (*out));
  yubikey_modhex_decode ((char *) out, (const char *) token, sizeof (*out));
  yubikey_aes_decrypt ((uint8_t *) out, key);
}

void
yubikey_generate (yubikey_token_t token,
		  const uint8_t key[YUBIKEY_KEY_SIZE],
		  char out[YUBIKEY_OTP_SIZE + 1])
{
  yubikey_aes_encrypt ((uint8_t *) token, key);
  yubikey_modhex_encode (out, (const char *) token, YUBIKEY_KEY_SIZE);
}