1 /* 2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "krb5_locl.h" 35 36 int _krb5_AES_string_to_default_iterator = 4096; 37 38 static krb5_error_code 39 AES_string_to_key(krb5_context context, 40 krb5_enctype enctype, 41 krb5_data password, 42 krb5_salt salt, 43 krb5_data opaque, 44 krb5_keyblock *key) 45 { 46 krb5_error_code ret; 47 uint32_t iter; 48 struct _krb5_encryption_type *et; 49 struct _krb5_key_data kd; 50 51 if (opaque.length == 0) 52 iter = _krb5_AES_string_to_default_iterator; 53 else if (opaque.length == 4) { 54 unsigned long v; 55 _krb5_get_int(opaque.data, &v, 4); 56 iter = ((uint32_t)v); 57 } else 58 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */ 59 60 et = _krb5_find_enctype(enctype); 61 if (et == NULL) 62 return KRB5_PROG_KEYTYPE_NOSUPP; 63 64 kd.schedule = NULL; 65 ALLOC(kd.key, 1); 66 if(kd.key == NULL) { 67 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", "")); 68 return ENOMEM; 69 } 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_SHA1(password.data, password.length, 78 salt.saltvalue.data, salt.saltvalue.length, 79 iter, 80 et->keytype->size, kd.key->keyvalue.data); 81 if (ret != 1) { 82 _krb5_free_key_data(context, &kd, et); 83 krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP, 84 "Error calculating s2k"); 85 return KRB5_PROG_KEYTYPE_NOSUPP; 86 } 87 88 ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos")); 89 if (ret == 0) 90 ret = krb5_copy_keyblock_contents(context, kd.key, key); 91 _krb5_free_key_data(context, &kd, et); 92 93 return ret; 94 } 95 96 struct salt_type _krb5_AES_salt[] = { 97 { 98 KRB5_PW_SALT, 99 "pw-salt", 100 AES_string_to_key 101 }, 102 { 0 } 103 }; 104