ccmisc.c   [plain text]

/*
 * Copyright (c) 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 <config.h>

#ifndef HAVE_CCDESISWEAKKEY

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <krb5-types.h>

#include <CommonCrypto/CommonCryptor.h>
#include "CCDGlue.h"

static uint8_t weak_keys[][8] = {
    {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, /* weak keys */
    {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
    {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
    {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
    {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, /* semi-weak keys */
    {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
    {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
    {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
    {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
    {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
    {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
    {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
    {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
    {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
    {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
    {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}
};

CCCryptorStatus
CCDesIsWeakKey(const void *key, size_t length)
{
    size_t n;
    
    if (length != 8)
        return -1;
    
    for (n = 0; n < sizeof(weak_keys) / sizeof(weak_keys[0]); n++)
        if (memcmp(weak_keys[n], key, 8) == 0)
            return -1;
    
    return 0;
}

static uint8_t odd_parity[256] = {
    1,  1,  2,  2,  4,  4,  7,  7,  8,  8, 11, 11, 13, 13, 14, 14,
    16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
    32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
    49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
    64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
    81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
    97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
    112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
    128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
    145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
    161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
    176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
    193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
    208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
    224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
    241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254,
};

void
CCDesSetOddParity(void *key, size_t Length)
{
    uint8_t *p = key;
    size_t n;
    
    for (n = 0; n < Length; n++)
        p[n] = odd_parity[p[n]];
    
}

uint32_t
CCDesCBCCksum(void *input, void *output,
	      size_t length, void *key, size_t keylen,
	      void *ivec)
{
    abort();
}


#endif