crypto/external/bsd/heimdal/dist/lib/krb5/crypto-des-common.c

   1 /*      $NetBSD: crypto-des-common.c,v 1.1.1.1 2011/04/13 18:15:32 elric Exp $  */
   2
   3 /*
   4  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /* Functions which are used by both single and triple DES enctypes */
  37
  38 #include "krb5_locl.h"
  39
  40 /*
  41  * A = A xor B. A & B are 8 bytes.
  42  */
  43
  44 void
  45 _krb5_xor (DES_cblock *key, const unsigned char *b)
  46 {
  47     unsigned char *a = (unsigned char*)key;
  48     a[0] ^= b[0];
  49     a[1] ^= b[1];
  50     a[2] ^= b[2];
  51     a[3] ^= b[3];
  52     a[4] ^= b[4];
  53     a[5] ^= b[5];
  54     a[6] ^= b[6];
  55     a[7] ^= b[7];
  56 }
  57
  58 #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
  59 krb5_error_code
  60 _krb5_des_checksum(krb5_context context,
  61                    const EVP_MD *evp_md,
  62                    struct _krb5_key_data *key,
  63                    const void *data,
  64                    size_t len,
  65                    Checksum *cksum)
  66 {
  67     struct _krb5_evp_schedule *ctx = key->schedule->data;
  68     EVP_MD_CTX *m;
  69     DES_cblock ivec;
  70     unsigned char *p = cksum->checksum.data;
  71
  72     krb5_generate_random_block(p, 8);
  73
  74     m = EVP_MD_CTX_create();
  75     if (m == NULL) {
  76         krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
  77         return ENOMEM;
  78     }
  79
  80     EVP_DigestInit_ex(m, evp_md, NULL);
  81     EVP_DigestUpdate(m, p, 8);
  82     EVP_DigestUpdate(m, data, len);
  83     EVP_DigestFinal_ex (m, p + 8, NULL);
  84     EVP_MD_CTX_destroy(m);
  85     memset (&ivec, 0, sizeof(ivec));
  86     EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
  87     EVP_Cipher(&ctx->ectx, p, p, 24);
  88
  89     return 0;
  90 }
  91
  92 krb5_error_code
  93 _krb5_des_verify(krb5_context context,
  94                  const EVP_MD *evp_md,
  95                  struct _krb5_key_data *key,
  96                  const void *data,
  97                  size_t len,
  98                  Checksum *C)
  99 {
 100     struct _krb5_evp_schedule *ctx = key->schedule->data;
 101     EVP_MD_CTX *m;
 102     unsigned char tmp[24];
 103     unsigned char res[16];
 104     DES_cblock ivec;
 105     krb5_error_code ret = 0;
 106
 107     m = EVP_MD_CTX_create();
 108     if (m == NULL) {
 109         krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
 110         return ENOMEM;
 111     }
 112
 113     memset(&ivec, 0, sizeof(ivec));
 114     EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
 115     EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
 116
 117     EVP_DigestInit_ex(m, evp_md, NULL);
 118     EVP_DigestUpdate(m, tmp, 8); /* confounder */
 119     EVP_DigestUpdate(m, data, len);
 120     EVP_DigestFinal_ex (m, res, NULL);
 121     EVP_MD_CTX_destroy(m);
 122     if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
 123         krb5_clear_error_message (context);
 124         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
 125     }
 126     memset(tmp, 0, sizeof(tmp));
 127     memset(res, 0, sizeof(res));
 128     return ret;
 129 }
 130
 131 #endif
 132
 133 static krb5_error_code
 134 RSA_MD5_checksum(krb5_context context,
 135                  struct _krb5_key_data *key,
 136                  const void *data,
 137                  size_t len,
 138                  unsigned usage,
 139                  Checksum *C)
 140 {
 141     if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
 142         krb5_abortx(context, "md5 checksum failed");
 143     return 0;
 144 }
 145
 146 struct _krb5_checksum_type _krb5_checksum_rsa_md5 = {
 147     CKSUMTYPE_RSA_MD5,
 148     "rsa-md5",
 149     64,
 150     16,
 151     F_CPROOF,
 152     RSA_MD5_checksum,
 153     NULL
 154 };