1 /* $NetBSD: salt-des3.c,v 1.3 2019/12/15 22:50:50 christos 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 #include "krb5_locl.h" 37 38 #ifdef DES3_OLD_ENCTYPE 39 static krb5_error_code 40 DES3_string_to_key(krb5_context context, 41 krb5_enctype enctype, 42 krb5_data password, 43 krb5_salt salt, 44 krb5_data opaque, 45 krb5_keyblock *key) 46 { 47 char *str; 48 size_t len; 49 unsigned char tmp[24]; 50 DES_cblock keys[3]; 51 krb5_error_code ret; 52 53 len = password.length + salt.saltvalue.length; 54 str = malloc(len); 55 if (len != 0 && str == NULL) 56 return krb5_enomem(context); 57 memcpy(str, password.data, password.length); 58 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length); 59 { 60 DES_cblock ivec; 61 DES_key_schedule s[3]; 62 int i; 63 64 ret = _krb5_n_fold(str, len, tmp, 24); 65 if (ret) { 66 memset_s(str, len, 0, len); 67 free(str); 68 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 69 return ret; 70 } 71 72 for(i = 0; i < 3; i++){ 73 memcpy(keys + i, tmp + i * 8, sizeof(keys[i])); 74 DES_set_odd_parity(keys + i); 75 if(DES_is_weak_key(keys + i)) 76 _krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 77 DES_set_key_unchecked(keys + i, &s[i]); 78 } 79 memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec)); 80 DES_ede3_cbc_encrypt(tmp, 81 tmp, sizeof(tmp), 82 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT); 83 memset_s(s, sizeof(s), 0, sizeof(s)); 84 memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec)); 85 for(i = 0; i < 3; i++){ 86 memcpy(keys + i, tmp + i * 8, sizeof(keys[i])); 87 DES_set_odd_parity(keys + i); 88 if(DES_is_weak_key(keys + i)) 89 _krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 90 } 91 memset_s(tmp, sizeof(tmp), 0, sizeof(tmp)); 92 } 93 key->keytype = enctype; 94 krb5_data_copy(&key->keyvalue, keys, sizeof(keys)); 95 memset_s(keys, sizeof(keys), 0, sizeof(keys)); 96 memset_s(str, len, 0, len); 97 free(str); 98 return 0; 99 } 100 #endif 101 102 static krb5_error_code 103 DES3_string_to_key_derived(krb5_context context, 104 krb5_enctype enctype, 105 krb5_data password, 106 krb5_salt salt, 107 krb5_data opaque, 108 krb5_keyblock *key) 109 { 110 krb5_error_code ret; 111 size_t len = password.length + salt.saltvalue.length; 112 char *s; 113 114 s = malloc(len); 115 if (len != 0 && s == NULL) 116 return krb5_enomem(context); 117 memcpy(s, password.data, password.length); 118 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length); 119 ret = krb5_string_to_key_derived(context, 120 s, 121 len, 122 enctype, 123 key); 124 memset_s(s, len, 0, len); 125 free(s); 126 return ret; 127 } 128 129 130 #ifdef DES3_OLD_ENCTYPE 131 struct salt_type _krb5_des3_salt[] = { 132 { 133 KRB5_PW_SALT, 134 "pw-salt", 135 DES3_string_to_key 136 }, 137 { 0, NULL, NULL } 138 }; 139 #endif 140 141 struct salt_type _krb5_des3_salt_derived[] = { 142 { 143 KRB5_PW_SALT, 144 "pw-salt", 145 DES3_string_to_key_derived 146 }, 147 { 0, NULL, NULL } 148 }; 149