| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| */ |
| |
| package sun.security.krb5.internal.crypto; |
| |
| import javax.crypto.Cipher; |
| import javax.crypto.spec.SecretKeySpec; |
| import javax.crypto.SecretKeyFactory; |
| import javax.crypto.SecretKey; |
| import java.security.GeneralSecurityException; |
| import javax.crypto.spec.IvParameterSpec; |
| import sun.security.krb5.KrbCryptoException; |
| import java.util.Arrays; |
| import sun.security.action.GetPropertyAction; |
| |
| public final class Des { |
| |
| // RFC 3961 demands that UTF-8 encoding be used in DES's |
| // string-to-key function. For historical reasons, some |
| // implementations use a locale-specific encoding. Even |
| // so, when the client and server use different locales, |
| // they must agree on a common value, normally the one |
| // used when the password is set/reset. |
| // |
| // The following system property is provided to perform the |
| // string-to-key encoding. When set, the specified charset |
| // name is used. Otherwise, the system default charset. |
| |
| private final static String CHARSET = |
| java.security.AccessController.doPrivileged( |
| new GetPropertyAction("sun.security.krb5.msinterop.des.s2kcharset")); |
| |
| private static final long[] bad_keys = { |
| 0x0101010101010101L, 0xfefefefefefefefeL, |
| 0x1f1f1f1f1f1f1f1fL, 0xe0e0e0e0e0e0e0e0L, |
| 0x01fe01fe01fe01feL, 0xfe01fe01fe01fe01L, |
| 0x1fe01fe00ef10ef1L, 0xe01fe01ff10ef10eL, |
| 0x01e001e001f101f1L, 0xe001e001f101f101L, |
| 0x1ffe1ffe0efe0efeL, 0xfe1ffe1ffe0efe0eL, |
| 0x011f011f010e010eL, 0x1f011f010e010e01L, |
| 0xe0fee0fef1fef1feL, 0xfee0fee0fef1fef1L |
| }; |
| |
| private static final byte[] good_parity = { |
| 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, |
| (byte)128, (byte)128, (byte)131, (byte)131, |
| (byte)133, (byte)133, (byte)134, (byte)134, |
| (byte)137, (byte)137, (byte)138, (byte)138, |
| (byte)140, (byte)140, (byte)143, (byte)143, |
| (byte)145, (byte)145, (byte)146, (byte)146, |
| (byte)148, (byte)148, (byte)151, (byte)151, |
| (byte)152, (byte)152, (byte)155, (byte)155, |
| (byte)157, (byte)157, (byte)158, (byte)158, |
| (byte)161, (byte)161, (byte)162, (byte)162, |
| (byte)164, (byte)164, (byte)167, (byte)167, |
| (byte)168, (byte)168, (byte)171, (byte)171, |
| (byte)173, (byte)173, (byte)174, (byte)174, |
| (byte)176, (byte)176, (byte)179, (byte)179, |
| (byte)181, (byte)181, (byte)182, (byte)182, |
| (byte)185, (byte)185, (byte)186, (byte)186, |
| (byte)188, (byte)188, (byte)191, (byte)191, |
| (byte)193, (byte)193, (byte)194, (byte)194, |
| (byte)196, (byte)196, (byte)199, (byte)199, |
| (byte)200, (byte)200, (byte)203, (byte)203, |
| (byte)205, (byte)205, (byte)206, (byte)206, |
| (byte)208, (byte)208, (byte)211, (byte)211, |
| (byte)213, (byte)213, (byte)214, (byte)214, |
| (byte)217, (byte)217, (byte)218, (byte)218, |
| (byte)220, (byte)220, (byte)223, (byte)223, |
| (byte)224, (byte)224, (byte)227, (byte)227, |
| (byte)229, (byte)229, (byte)230, (byte)230, |
| (byte)233, (byte)233, (byte)234, (byte)234, |
| (byte)236, (byte)236, (byte)239, (byte)239, |
| (byte)241, (byte)241, (byte)242, (byte)242, |
| (byte)244, (byte)244, (byte)247, (byte)247, |
| (byte)248, (byte)248, (byte)251, (byte)251, |
| (byte)253, (byte)253, (byte)254, (byte)254 |
| }; |
| |
| public static final byte[] set_parity(byte[] key) { |
| for (int i=0; i < 8; i++) { |
| key[i] = good_parity[key[i] & 0xff]; |
| } |
| return key; |
| } |
| |
| public static final long set_parity(long key) { |
| return octet2long(set_parity(long2octet(key))); |
| } |
| |
| public static final boolean bad_key(long key) { |
| for (int i = 0; i < bad_keys.length; i++) { |
| if (bad_keys[i] == key) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public static final boolean bad_key(byte[] key) { |
| return bad_key(octet2long(key)); |
| } |
| |
| public static long octet2long(byte[] input) { |
| return octet2long(input, 0); |
| } |
| |
| public static long octet2long(byte[] input, int offset) { //convert a 8-byte to a long |
| long result = 0; |
| for (int i = 0; i < 8; i++) { |
| if (i + offset < input.length) { |
| result |= (((long)input[i + offset]) & 0xffL) << ((7 - i) * 8); |
| } |
| } |
| return result; |
| } |
| |
| public static byte[] long2octet(long input) { |
| byte[] output = new byte[8]; |
| for (int i = 0; i < 8; i++) { |
| output[i] = (byte)((input >>> ((7 - i) * 8)) & 0xffL); |
| } |
| return output; |
| } |
| |
| public static void long2octet(long input, byte[] output) { |
| long2octet(input, output, 0); |
| } |
| |
| public static void long2octet(long input, byte[] output, int offset) { |
| for (int i = 0; i < 8; i++) { |
| if (i + offset < output.length) { |
| output[i + offset] = |
| (byte)((input >>> ((7 - i) * 8)) & 0xffL); |
| } |
| } |
| } |
| |
| /** |
| * Creates a DES cipher in Electronic Codebook mode, with no padding. |
| * @param input plain text. |
| * @param output the buffer for the result. |
| * @param key DES the key to encrypt the text. |
| * @param ivec initialization vector. |
| * |
| * @created by Yanni Zhang, Dec 6 99. |
| */ |
| public static void cbc_encrypt ( |
| byte[] input, |
| byte[] output, |
| byte[] key, |
| byte[] ivec, |
| boolean encrypt) throws KrbCryptoException { |
| |
| Cipher cipher = null; |
| |
| try { |
| cipher = Cipher.getInstance("DES/CBC/NoPadding"); |
| } catch (GeneralSecurityException e) { |
| KrbCryptoException ke = new KrbCryptoException("JCE provider may not be installed. " |
| + e.getMessage()); |
| ke.initCause(e); |
| throw ke; |
| } |
| IvParameterSpec params = new IvParameterSpec(ivec); |
| SecretKeySpec skSpec = new SecretKeySpec(key, "DES"); |
| try { |
| SecretKeyFactory skf = SecretKeyFactory.getInstance("DES"); |
| // SecretKey sk = skf.generateSecret(skSpec); |
| SecretKey sk = (SecretKey) skSpec; |
| if (encrypt) |
| cipher.init(Cipher.ENCRYPT_MODE, sk, params); |
| else |
| cipher.init(Cipher.DECRYPT_MODE, sk, params); |
| byte[] result; |
| result = cipher.doFinal(input); |
| System.arraycopy(result, 0, output, 0, result.length); |
| } catch (GeneralSecurityException e) { |
| KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| ke.initCause(e); |
| throw ke; |
| } |
| } |
| |
| /** |
| * Generates DES key from the password. |
| * @param password a char[] used to create the key. |
| * @return DES key. |
| * |
| * @modified by Yanni Zhang, Dec 6, 99 |
| */ |
| public static long char_to_key(char[] passwdChars) throws KrbCryptoException { |
| long key = 0; |
| long octet, octet1, octet2 = 0; |
| byte[] cbytes = null; |
| |
| // Convert password to byte array |
| try { |
| if (CHARSET == null) { |
| cbytes = (new String(passwdChars)).getBytes(); |
| } else { |
| cbytes = (new String(passwdChars)).getBytes(CHARSET); |
| } |
| } catch (Exception e) { |
| // clear-up sensitive information |
| if (cbytes != null) { |
| Arrays.fill(cbytes, 0, cbytes.length, (byte) 0); |
| } |
| KrbCryptoException ce = |
| new KrbCryptoException("Unable to convert passwd, " + e); |
| ce.initCause(e); |
| throw ce; |
| } |
| |
| // pad data |
| byte[] passwdBytes = pad(cbytes); |
| |
| byte[] newkey = new byte[8]; |
| int length = (passwdBytes.length / 8) + (passwdBytes.length % 8 == 0 ? 0 : 1); |
| for (int i = 0; i < length; i++) { |
| octet = octet2long(passwdBytes, i * 8) & 0x7f7f7f7f7f7f7f7fL; |
| if (i % 2 == 1) { |
| octet1 = 0; |
| for (int j = 0; j < 64; j++) { |
| octet1 |= ((octet & (1L << j)) >>> j) << (63 - j); |
| } |
| octet = octet1 >>> 1; |
| } |
| key ^= (octet << 1); |
| } |
| key = set_parity(key); |
| if (bad_key(key)) { |
| byte [] temp = long2octet(key); |
| temp[7] ^= 0xf0; |
| key = octet2long(temp); |
| } |
| |
| newkey = des_cksum(long2octet(key), passwdBytes, long2octet(key)); |
| key = octet2long(set_parity(newkey)); |
| if (bad_key(key)) { |
| byte [] temp = long2octet(key); |
| temp[7] ^= 0xf0; |
| key = octet2long(temp); |
| } |
| |
| // clear-up sensitive information |
| if (cbytes != null) { |
| Arrays.fill(cbytes, 0, cbytes.length, (byte) 0); |
| } |
| if (passwdBytes != null) { |
| Arrays.fill(passwdBytes, 0, passwdBytes.length, (byte) 0); |
| } |
| |
| return key; |
| } |
| |
| /** |
| * Encrypts the message blocks using DES CBC and output the |
| * final block of 8-byte ciphertext. |
| * @param ivec Initialization vector. |
| * @param msg Input message as an byte array. |
| * @param key DES key to encrypt the message. |
| * @return the last block of ciphertext. |
| * |
| * @created by Yanni Zhang, Dec 6, 99. |
| */ |
| public static byte[] des_cksum(byte[] ivec, byte[] msg, byte[] key) throws KrbCryptoException { |
| Cipher cipher = null; |
| |
| byte[] result = new byte[8]; |
| try{ |
| cipher = Cipher.getInstance("DES/CBC/NoPadding"); |
| } catch (Exception e) { |
| KrbCryptoException ke = new KrbCryptoException("JCE provider may not be installed. " |
| + e.getMessage()); |
| ke.initCause(e); |
| throw ke; |
| } |
| IvParameterSpec params = new IvParameterSpec(ivec); |
| SecretKeySpec skSpec = new SecretKeySpec(key, "DES"); |
| try { |
| SecretKeyFactory skf = SecretKeyFactory.getInstance("DES"); |
| // SecretKey sk = skf.generateSecret(skSpec); |
| SecretKey sk = (SecretKey) skSpec; |
| cipher.init(Cipher.ENCRYPT_MODE, sk, params); |
| for (int i = 0; i < msg.length / 8; i++) { |
| result = cipher.doFinal(msg, i * 8, 8); |
| cipher.init(Cipher.ENCRYPT_MODE, sk, (new IvParameterSpec(result))); |
| } |
| } |
| catch (GeneralSecurityException e) { |
| KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| ke.initCause(e); |
| throw ke; |
| } |
| return result; |
| } |
| |
| /** |
| * Pads the data so that its length is a multiple of 8 bytes. |
| * @param data the raw data. |
| * @return the data being padded. |
| * |
| * @created by Yanni Zhang, Dec 6 99. //Kerberos does not use PKCS5 padding. |
| */ |
| static byte[] pad(byte[] data) { |
| int len; |
| if (data.length < 8) len = data.length; |
| else len = data.length % 8; |
| if (len == 0) return data; |
| else { |
| byte[] padding = new byte[ 8 - len + data.length]; |
| for (int i = padding.length - 1; i > data.length - 1; i--) { |
| padding[i] = 0; |
| } |
| System.arraycopy(data, 0, padding, 0, data.length); |
| return padding; |
| } |
| } |
| |
| // Caller is responsible for clearing password |
| public static byte[] string_to_key_bytes(char[] passwdChars) |
| throws KrbCryptoException { |
| return long2octet(char_to_key(passwdChars)); |
| } |
| } |