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/*
 *
 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
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package sun.security.krb5;

import sun.security.util.*;
import sun.security.krb5.internal.crypto.*;
import sun.security.krb5.internal.*;
import java.io.IOException;
import java.math.BigInteger;

This class encapsulates Kerberos encrypted data. It allows callers access to both the ASN.1 encoded form of the EncryptedData type as well as the raw cipher text.
/** * This class encapsulates Kerberos encrypted data. It allows * callers access to both the ASN.1 encoded form of the EncryptedData * type as well as the raw cipher text. */
public class EncryptedData implements Cloneable { int eType; Integer kvno; // optional byte[] cipher; byte[] plain; // not part of ASN.1 encoding // ----------------+-----------+----------+----------------+--------------- // Encryption type |etype value|block size|minimum pad size|confounder size // ----------------+-----------+----------+----------------+--------------- public static final int ETYPE_NULL = 0; // 1 0 0 public static final int ETYPE_DES_CBC_CRC = 1; // 8 4 8 public static final int ETYPE_DES_CBC_MD4 = 2; // 8 0 8 public static final int ETYPE_DES_CBC_MD5 = 3; // 8 0 8 // draft-brezak-win2k-krb-rc4-hmac-04.txt public static final int ETYPE_ARCFOUR_HMAC = 23; // 1 // NOTE: the exportable RC4-HMAC is not supported; // it is no longer a usable encryption type public static final int ETYPE_ARCFOUR_HMAC_EXP = 24; // 1 // draft-ietf-krb-wg-crypto-07.txt public static final int ETYPE_DES3_CBC_HMAC_SHA1_KD = 16; // 8 0 8 // draft-raeburn-krb-rijndael-krb-07.txt public static final int ETYPE_AES128_CTS_HMAC_SHA1_96 = 17; // 16 0 16 public static final int ETYPE_AES256_CTS_HMAC_SHA1_96 = 18; // 16 0 16 /* used by self */ private EncryptedData() { } public Object clone() { EncryptedData new_encryptedData = new EncryptedData(); new_encryptedData.eType = eType; if (kvno != null) { new_encryptedData.kvno = new Integer(kvno.intValue()); } if (cipher != null) { new_encryptedData.cipher = new byte[cipher.length]; System.arraycopy(cipher, 0, new_encryptedData.cipher, 0, cipher.length); } return new_encryptedData; } // Used in JSSE (com.sun.net.ssl.internal.KerberosPreMasterSecret) public EncryptedData( int new_eType, Integer new_kvno, byte[] new_cipher) { eType = new_eType; kvno = new_kvno; cipher = new_cipher; } /* // Not used. public EncryptedData( EncryptionKey key, byte[] plaintext) throws KdcErrException, KrbCryptoException { EType etypeEngine = EType.getInstance(key.getEType()); cipher = etypeEngine.encrypt(plaintext, key.getBytes()); eType = key.getEType(); kvno = key.getKeyVersionNumber(); } */ // used in KrbApRep, KrbApReq, KrbAsReq, KrbCred, KrbPriv // Used in JSSE (com.sun.net.ssl.internal.KerberosPreMasterSecret) public EncryptedData( EncryptionKey key, byte[] plaintext, int usage) throws KdcErrException, KrbCryptoException { EType etypeEngine = EType.getInstance(key.getEType()); cipher = etypeEngine.encrypt(plaintext, key.getBytes(), usage); eType = key.getEType(); kvno = key.getKeyVersionNumber(); } /* // Not used. public EncryptedData( EncryptionKey key, byte[] ivec, byte[] plaintext) throws KdcErrException, KrbCryptoException { EType etypeEngine = EType.getInstance(key.getEType()); cipher = etypeEngine.encrypt(plaintext, key.getBytes(), ivec); eType = key.getEType(); kvno = key.getKeyVersionNumber(); } */ /* // Not used. EncryptedData( StringBuffer password, byte[] plaintext) throws KdcErrException, KrbCryptoException { EncryptionKey key = new EncryptionKey(password); EType etypeEngine = EType.getInstance(key.getEType()); cipher = etypeEngine.encrypt(plaintext, key.getBytes()); eType = key.getEType(); kvno = key.getKeyVersionNumber(); } */ public byte[] decrypt( EncryptionKey key, int usage) throws KdcErrException, KrbApErrException, KrbCryptoException { if (eType != key.getEType()) { throw new KrbCryptoException( "EncryptedData is encrypted using keytype " + EType.toString(eType) + " but decryption key is of type " + EType.toString(key.getEType())); } EType etypeEngine = EType.getInstance(eType); plain = etypeEngine.decrypt(cipher, key.getBytes(), usage); // The raw ticket is still needed for the replay cache. //cipher = null; return etypeEngine.decryptedData(plain); } /* // currently destructive on cipher // Not used. public byte[] decrypt( EncryptionKey key, byte[] ivec, int usage) throws KdcErrException, KrbApErrException, KrbCryptoException { // XXX check for matching eType and kvno here EType etypeEngine = EType.getInstance(eType); plain = etypeEngine.decrypt(cipher, key.getBytes(), ivec, usage); cipher = null; return etypeEngine.decryptedData(plain); } // currently destructive on cipher // Not used. byte[] decrypt(StringBuffer password) throws KdcErrException, KrbApErrException, KrbCryptoException { EncryptionKey key = new EncryptionKey(password); // XXX check for matching eType here EType etypeEngine = EType.getInstance(eType); plain = etypeEngine.decrypt(cipher, key.getBytes()); cipher = null; return etypeEngine.decryptedData(plain); } */ private byte[] decryptedData() throws KdcErrException { if (plain != null) { EType etypeEngine = EType.getInstance(eType); return etypeEngine.decryptedData(plain); } return null; }
Constructs an instance of EncryptedData type.
Params:
  • encoding – a single DER-encoded value.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
/** * Constructs an instance of EncryptedData type. * @param encoding a single DER-encoded value. * @exception Asn1Exception if an error occurs while decoding an * ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded * data. * */
/* Used by self */ private EncryptedData(DerValue encoding) throws Asn1Exception, IOException { DerValue der = null; if (encoding.getTag() != DerValue.tag_Sequence) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } der = encoding.getData().getDerValue(); if ((der.getTag() & (byte)0x1F) == (byte)0x00) { eType = (der.getData().getBigInteger()).intValue(); } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } if ((encoding.getData().peekByte() & 0x1F) == 1) { der = encoding.getData().getDerValue(); int i = (der.getData().getBigInteger()).intValue(); kvno = new Integer(i); } else { kvno = null; } der = encoding.getData().getDerValue(); if ((der.getTag() & (byte)0x1F) == (byte)0x02) { cipher = der.getData().getOctetString(); } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } if (encoding.getData().available() > 0) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } }
Returns an ASN.1 encoded EncryptedData type. EncryptedData ::= SEQUENCE { etype [0] Int32 -- EncryptionType --, kvno [1] UInt32 OPTIONAL, cipher [2] OCTET STRING -- ciphertext }

This definition reflects the Network Working Group RFC 4120 specification available at http://www.ietf.org/rfc/rfc4120.txt.

Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:byte array of encoded EncryptedData object.
/** * Returns an ASN.1 encoded EncryptedData type. * * <xmp> * EncryptedData ::= SEQUENCE { * etype [0] Int32 -- EncryptionType --, * kvno [1] UInt32 OPTIONAL, * cipher [2] OCTET STRING -- ciphertext * } * </xmp> * * <p> * This definition reflects the Network Working Group RFC 4120 * specification available at * <a href="http://www.ietf.org/rfc/rfc4120.txt"> * http://www.ietf.org/rfc/rfc4120.txt</a>. * <p> * @return byte array of encoded EncryptedData object. * @exception Asn1Exception if an error occurs while decoding an * ASN1 encoded data. * @exception IOException if an I/O error occurs while reading * encoded data. * */
public byte[] asn1Encode() throws Asn1Exception, IOException { DerOutputStream bytes = new DerOutputStream(); DerOutputStream temp = new DerOutputStream(); temp.putInteger(BigInteger.valueOf(this.eType)); bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp); temp = new DerOutputStream(); if (kvno != null) { // encode as an unsigned integer (UInt32) temp.putInteger(BigInteger.valueOf(this.kvno.longValue())); bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp); temp = new DerOutputStream(); } temp.putOctetString(this.cipher); bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), temp); temp = new DerOutputStream(); temp.write(DerValue.tag_Sequence, bytes); return temp.toByteArray(); }
Parse (unmarshal) an EncryptedData from a DER input stream. This form parsing might be used when expanding a value which is part of a constructed sequence and uses explicitly tagged type.
Params:
  • data – the Der input stream value, which contains one or more marshaled value.
  • explicitTag – tag number.
  • optional – indicate if this data field is optional
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:an instance of EncryptedData.
/** * Parse (unmarshal) an EncryptedData from a DER input stream. This form * parsing might be used when expanding a value which is part of * a constructed sequence and uses explicitly tagged type. * * @param data the Der input stream value, which contains one or more * marshaled value. * @param explicitTag tag number. * @param optional indicate if this data field is optional * @exception Asn1Exception if an error occurs while decoding an * ASN1 encoded data. * @exception IOException if an I/O error occurs while reading * encoded data. * @return an instance of EncryptedData. * */
public static EncryptedData parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException { if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag)) return null; DerValue der = data.getDerValue(); if (explicitTag != (der.getTag() & (byte)0x1F)) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } else { DerValue subDer = der.getData().getDerValue(); return new EncryptedData(subDer); } }
Reset asn.1 data stream after decryption, remove redundant bytes.
Params:
  • data – the decrypted data from decrypt().
Returns:the reset byte array which holds exactly one asn1 datum including its tag and length.
/** * Reset asn.1 data stream after decryption, remove redundant bytes. * @param data the decrypted data from decrypt(). * @return the reset byte array which holds exactly one asn1 datum * including its tag and length. * */
public byte[] reset(byte[] data) { byte[] bytes = null; // for asn.1 encoded data, we use length field to // determine the data length and remove redundant paddings. if ((data[1] & 0xFF) < 128) { bytes = new byte[data[1] + 2]; System.arraycopy(data, 0, bytes, 0, data[1] + 2); } else { if ((data[1] & 0xFF) > 128) { int len = data[1] & (byte)0x7F; int result = 0; for (int i = 0; i < len; i++) { result |= (data[i + 2] & 0xFF) << (8 * (len - i - 1)); } bytes = new byte[result + len + 2]; System.arraycopy(data, 0, bytes, 0, result + len + 2); } } return bytes; } public int getEType() { return eType; } public Integer getKeyVersionNumber() { return kvno; }
Returns the raw cipher text bytes, not in ASN.1 encoding.
/** * Returns the raw cipher text bytes, not in ASN.1 encoding. */
public byte[] getBytes() { return cipher; } }