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salt-aes-sha1.c revision 1.1 
      1 /*	$NetBSD: salt-aes-sha1.c,v 1.1 2017/01/28 20:46:52 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 - 2008 Kungliga Tekniska Hgskolan
      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 #include "krb5_locl.h"
     37 
     38 int _krb5_AES_SHA1_string_to_default_iterator = 4096;
     39 
     40 static krb5_error_code
     41 AES_SHA1_string_to_key(krb5_context context,
     42 		       krb5_enctype enctype,
     43 		       krb5_data password,
     44 		       krb5_salt salt,
     45 		       krb5_data opaque,
     46 		       krb5_keyblock *key)
     47 {
     48     krb5_error_code ret;
     49     uint32_t iter;
     50     struct _krb5_encryption_type *et;
     51     struct _krb5_key_data kd;
     52 
     53     if (opaque.length == 0)
     54 	iter = _krb5_AES_SHA1_string_to_default_iterator;
     55     else if (opaque.length == 4) {
     56 	unsigned long v;
     57 	_krb5_get_int(opaque.data, &v, 4);
     58 	iter = ((uint32_t)v);
     59     } else
     60 	return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
     61 
     62     et = _krb5_find_enctype(enctype);
     63     if (et == NULL)
     64 	return KRB5_PROG_KEYTYPE_NOSUPP;
     65 
     66     kd.schedule = NULL;
     67     ALLOC(kd.key, 1);
     68     if (kd.key == NULL)
     69 	return krb5_enomem(context);
     70     kd.key->keytype = enctype;
     71     ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
     72     if (ret) {
     73 	krb5_set_error_message (context, ret, N_("malloc: out of memory", ""));
     74 	return ret;
     75     }
     76 
     77     ret = PKCS5_PBKDF2_HMAC(password.data, password.length,
     78 			    salt.saltvalue.data, salt.saltvalue.length,
     79 			    iter,
     80 			    EVP_sha1(),
     81 			    et->keytype->size, kd.key->keyvalue.data);
     82     if (ret != 1) {
     83 	_krb5_free_key_data(context, &kd, et);
     84 	krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
     85 			       "Error calculating s2k");
     86 	return KRB5_PROG_KEYTYPE_NOSUPP;
     87     }
     88 
     89     ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
     90     if (ret == 0)
     91 	ret = krb5_copy_keyblock_contents(context, kd.key, key);
     92     _krb5_free_key_data(context, &kd, et);
     93 
     94     return ret;
     95 }
     96 
     97 struct salt_type _krb5_AES_SHA1_salt[] = {
     98     {
     99 	KRB5_PW_SALT,
    100 	"pw-salt",
    101 	AES_SHA1_string_to_key
    102     },
    103     { 0, NULL, NULL }
    104 };
    105