J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Portions Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * |
| 28 | * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| 29 | * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| 30 | */ |
| 31 | |
| 32 | package sun.security.krb5; |
| 33 | |
| 34 | import sun.security.util.*; |
| 35 | import sun.security.krb5.internal.*; |
| 36 | import sun.security.krb5.internal.crypto.*; |
| 37 | import java.io.IOException; |
| 38 | import java.security.GeneralSecurityException; |
| 39 | import java.util.Arrays; |
| 40 | import sun.security.krb5.internal.ktab.KeyTab; |
| 41 | import sun.security.krb5.internal.ccache.CCacheOutputStream; |
| 42 | import javax.crypto.spec.DESKeySpec; |
| 43 | import javax.crypto.spec.DESedeKeySpec; |
| 44 | |
| 45 | /** |
| 46 | * This class encapsulates the concept of an EncryptionKey. An encryption |
| 47 | * key is defined in RFC 4120 as: |
| 48 | * |
| 49 | * EncryptionKey ::= SEQUENCE { |
| 50 | * keytype [0] Int32 -- actually encryption type --, |
| 51 | * keyvalue [1] OCTET STRING |
| 52 | * } |
| 53 | * |
| 54 | * keytype |
| 55 | * This field specifies the encryption type of the encryption key |
| 56 | * that follows in the keyvalue field. Although its name is |
| 57 | * "keytype", it actually specifies an encryption type. Previously, |
| 58 | * multiple cryptosystems that performed encryption differently but |
| 59 | * were capable of using keys with the same characteristics were |
| 60 | * permitted to share an assigned number to designate the type of |
| 61 | * key; this usage is now deprecated. |
| 62 | * |
| 63 | * keyvalue |
| 64 | * This field contains the key itself, encoded as an octet string. |
| 65 | */ |
| 66 | |
| 67 | public class EncryptionKey |
| 68 | implements Cloneable { |
| 69 | |
| 70 | public static final EncryptionKey NULL_KEY = |
| 71 | new EncryptionKey(new byte[] {}, EncryptedData.ETYPE_NULL, null); |
| 72 | |
| 73 | private int keyType; |
| 74 | private byte[] keyValue; |
| 75 | private Integer kvno; // not part of ASN1 encoding; |
| 76 | |
| 77 | private static final boolean DEBUG = Krb5.DEBUG; |
| 78 | |
| 79 | public synchronized int getEType() { |
| 80 | return keyType; |
| 81 | } |
| 82 | |
| 83 | public final Integer getKeyVersionNumber() { |
| 84 | return kvno; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Returns the raw key bytes, not in any ASN.1 encoding. |
| 89 | */ |
| 90 | public final byte[] getBytes() { |
| 91 | // This method cannot be called outside sun.security, hence no |
| 92 | // cloning. getEncoded() calls this method. |
| 93 | return keyValue; |
| 94 | } |
| 95 | |
| 96 | public synchronized Object clone() { |
| 97 | return new EncryptionKey(keyValue, keyType, kvno); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Obtains the latest version of the secret key of |
| 102 | * the principal from a keytab. |
| 103 | * |
| 104 | * @param princ the principal whose secret key is desired |
| 105 | * @param keytab the path to the keytab file. A value of null |
| 106 | * will be accepted to indicate that the default path should be |
| 107 | * searched. |
| 108 | * @returns the secret key or null if none was found. |
| 109 | */ |
| 110 | /* |
| 111 | // Replaced by acquireSecretKeys |
| 112 | public static EncryptionKey acquireSecretKey(PrincipalName princ, |
| 113 | String keytab) |
| 114 | throws KrbException, IOException { |
| 115 | |
| 116 | if (princ == null) { |
| 117 | throw new IllegalArgumentException( |
| 118 | "Cannot have null pricipal name to look in keytab."); |
| 119 | } |
| 120 | |
| 121 | KeyTab ktab = KeyTab.getInstance(keytab); |
| 122 | |
| 123 | if (ktab == null) |
| 124 | return null; |
| 125 | |
| 126 | return ktab.readServiceKey(princ); |
| 127 | } |
| 128 | */ |
| 129 | |
| 130 | /** |
| 131 | * Obtains all versions of the secret key of the principal from a |
| 132 | * keytab. |
| 133 | * |
| 134 | * @Param princ the principal whose secret key is desired |
| 135 | * @param keytab the path to the keytab file. A value of null |
| 136 | * will be accepted to indicate that the default path should be |
| 137 | * searched. |
| 138 | * @returns an array of secret keys or null if none were found. |
| 139 | */ |
| 140 | public static EncryptionKey[] acquireSecretKeys(PrincipalName princ, |
| 141 | String keytab) |
| 142 | throws KrbException, IOException { |
| 143 | |
| 144 | if (princ == null) |
| 145 | throw new IllegalArgumentException( |
| 146 | "Cannot have null pricipal name to look in keytab."); |
| 147 | |
| 148 | // KeyTab getInstance(keytab) will call KeyTab.getInstance() |
| 149 | // if keytab is null |
| 150 | KeyTab ktab = KeyTab.getInstance(keytab); |
| 151 | |
| 152 | if (ktab == null) { |
| 153 | return null; |
| 154 | } |
| 155 | |
| 156 | return ktab.readServiceKeys(princ); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Generate a list of keys using the given principal and password. |
| 161 | * Construct a key for each configured etype. |
| 162 | * Caller is responsible for clearing password. |
| 163 | */ |
| 164 | /* |
| 165 | * Usually, when keyType is decoded from ASN.1 it will contain a |
| 166 | * value indicating what the algorithm to be used is. However, when |
| 167 | * converting from a password to a key for the AS-EXCHANGE, this |
| 168 | * keyType will not be available. Use builtin list of default etypes |
| 169 | * as the default in that case. If default_tkt_enctypes was set in |
| 170 | * the libdefaults of krb5.conf, then use that sequence. |
| 171 | */ |
| 172 | // Used in Krb5LoginModule |
| 173 | public static EncryptionKey[] acquireSecretKeys(char[] password, |
| 174 | String salt) throws KrbException { |
| 175 | return (acquireSecretKeys(password, salt, false, 0, null)); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Generates a list of keys using the given principal, password, |
| 180 | * and the pre-authentication values. |
| 181 | */ |
| 182 | public static EncryptionKey[] acquireSecretKeys(char[] password, |
| 183 | String salt, boolean pa_exists, int pa_etype, byte[] pa_s2kparams) |
| 184 | throws KrbException { |
| 185 | |
| 186 | int[] etypes = EType.getDefaults("default_tkt_enctypes"); |
| 187 | if (etypes == null) { |
| 188 | etypes = EType.getBuiltInDefaults(); |
| 189 | } |
| 190 | |
| 191 | // set the preferred etype for preauth |
| 192 | if ((pa_exists) && (pa_etype != EncryptedData.ETYPE_NULL)) { |
| 193 | if (DEBUG) { |
| 194 | System.out.println("Pre-Authentication: " + |
| 195 | "Set preferred etype = " + pa_etype); |
| 196 | } |
| 197 | if (EType.isSupported(pa_etype)) { |
| 198 | // reset etypes to preferred value |
| 199 | etypes = new int[1]; |
| 200 | etypes[0] = pa_etype; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | EncryptionKey[] encKeys = new EncryptionKey[etypes.length]; |
| 205 | for (int i = 0; i < etypes.length; i++) { |
| 206 | if (EType.isSupported(etypes[i])) { |
| 207 | encKeys[i] = new EncryptionKey( |
| 208 | stringToKey(password, salt, pa_s2kparams, etypes[i]), |
| 209 | etypes[i], null); |
| 210 | } else { |
| 211 | if (DEBUG) { |
| 212 | System.out.println("Encryption Type " + |
| 213 | EType.toString(etypes[i]) + |
| 214 | " is not supported/enabled"); |
| 215 | } |
| 216 | } |
| 217 | } |
| 218 | return encKeys; |
| 219 | } |
| 220 | |
| 221 | // Used in Krb5AcceptCredential, self |
| 222 | public EncryptionKey(byte[] keyValue, |
| 223 | int keyType, |
| 224 | Integer kvno) { |
| 225 | |
| 226 | if (keyValue != null) { |
| 227 | this.keyValue = new byte[keyValue.length]; |
| 228 | System.arraycopy(keyValue, 0, this.keyValue, 0, keyValue.length); |
| 229 | } else { |
| 230 | throw new IllegalArgumentException("EncryptionKey: " + |
| 231 | "Key bytes cannot be null!"); |
| 232 | } |
| 233 | this.keyType = keyType; |
| 234 | this.kvno = kvno; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Constructs an EncryptionKey by using the specified key type and key |
| 239 | * value. It is used to recover the key when retrieving data from |
| 240 | * credential cache file. |
| 241 | * |
| 242 | */ |
| 243 | // Used in JSSE (KerberosWrapper), Credentials, |
| 244 | // javax.security.auth.kerberos.KeyImpl |
| 245 | public EncryptionKey(int keyType, |
| 246 | byte[] keyValue) { |
| 247 | this(keyValue, keyType, null); |
| 248 | } |
| 249 | |
| 250 | private static byte[] stringToKey(char[] password, String salt, |
| 251 | byte[] s2kparams, int keyType) throws KrbCryptoException { |
| 252 | |
| 253 | char[] slt = salt.toCharArray(); |
| 254 | char[] pwsalt = new char[password.length + slt.length]; |
| 255 | System.arraycopy(password, 0, pwsalt, 0, password.length); |
| 256 | System.arraycopy(slt, 0, pwsalt, password.length, slt.length); |
| 257 | Arrays.fill(slt, '0'); |
| 258 | |
| 259 | try { |
| 260 | switch (keyType) { |
| 261 | case EncryptedData.ETYPE_DES_CBC_CRC: |
| 262 | case EncryptedData.ETYPE_DES_CBC_MD5: |
| 263 | return Des.string_to_key_bytes(pwsalt); |
| 264 | |
| 265 | case EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD: |
| 266 | return Des3.stringToKey(pwsalt); |
| 267 | |
| 268 | case EncryptedData.ETYPE_ARCFOUR_HMAC: |
| 269 | return ArcFourHmac.stringToKey(password); |
| 270 | |
| 271 | case EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96: |
| 272 | return Aes128.stringToKey(password, salt, s2kparams); |
| 273 | |
| 274 | case EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96: |
| 275 | return Aes256.stringToKey(password, salt, s2kparams); |
| 276 | |
| 277 | default: |
| 278 | throw new IllegalArgumentException("encryption type " + |
| 279 | EType.toString(keyType) + " not supported"); |
| 280 | } |
| 281 | |
| 282 | } catch (GeneralSecurityException e) { |
| 283 | KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| 284 | ke.initCause(e); |
| 285 | throw ke; |
| 286 | } finally { |
| 287 | Arrays.fill(pwsalt, '0'); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | // Used in javax.security.auth.kerberos.KeyImpl |
| 292 | public EncryptionKey(char[] password, |
| 293 | String salt, |
| 294 | String algorithm) throws KrbCryptoException { |
| 295 | |
| 296 | if (algorithm == null || algorithm.equalsIgnoreCase("DES")) { |
| 297 | keyType = EncryptedData.ETYPE_DES_CBC_MD5; |
| 298 | } else if (algorithm.equalsIgnoreCase("DESede")) { |
| 299 | keyType = EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD; |
| 300 | } else if (algorithm.equalsIgnoreCase("AES128")) { |
| 301 | keyType = EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96; |
| 302 | } else if (algorithm.equalsIgnoreCase("ArcFourHmac")) { |
| 303 | keyType = EncryptedData.ETYPE_ARCFOUR_HMAC; |
| 304 | } else if (algorithm.equalsIgnoreCase("AES256")) { |
| 305 | keyType = EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96; |
| 306 | // validate if AES256 is enabled |
| 307 | if (!EType.isSupported(keyType)) { |
| 308 | throw new IllegalArgumentException("Algorithm " + algorithm + |
| 309 | " not enabled"); |
| 310 | } |
| 311 | } else { |
| 312 | throw new IllegalArgumentException("Algorithm " + algorithm + |
| 313 | " not supported"); |
| 314 | } |
| 315 | |
| 316 | keyValue = stringToKey(password, salt, null, keyType); |
| 317 | kvno = null; |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * Generates a sub-sessionkey from a given session key. |
| 322 | */ |
| 323 | // Used in KrbApRep, KrbApReq |
| 324 | EncryptionKey(EncryptionKey key) throws KrbCryptoException { |
| 325 | // generate random sub-session key |
| 326 | keyValue = Confounder.bytes(key.keyValue.length); |
| 327 | for (int i = 0; i < keyValue.length; i++) { |
| 328 | keyValue[i] ^= key.keyValue[i]; |
| 329 | } |
| 330 | keyType = key.keyType; |
| 331 | |
| 332 | // check for key parity and weak keys |
| 333 | try { |
| 334 | // check for DES key |
| 335 | if ((keyType == EncryptedData.ETYPE_DES_CBC_MD5) || |
| 336 | (keyType == EncryptedData.ETYPE_DES_CBC_CRC)) { |
| 337 | // fix DES key parity |
| 338 | if (!DESKeySpec.isParityAdjusted(keyValue, 0)) { |
| 339 | keyValue = Des.set_parity(keyValue); |
| 340 | } |
| 341 | // check for weak key |
| 342 | if (DESKeySpec.isWeak(keyValue, 0)) { |
| 343 | keyValue[7] = (byte)(keyValue[7] ^ 0xF0); |
| 344 | } |
| 345 | } |
| 346 | // check for 3DES key |
| 347 | if (keyType == EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD) { |
| 348 | // fix 3DES key parity |
| 349 | if (!DESedeKeySpec.isParityAdjusted(keyValue, 0)) { |
| 350 | keyValue = Des3.parityFix(keyValue); |
| 351 | } |
| 352 | // check for weak keys |
| 353 | byte[] oneKey = new byte[8]; |
| 354 | for (int i=0; i<keyValue.length; i+=8) { |
| 355 | System.arraycopy(keyValue, i, oneKey, 0, 8); |
| 356 | if (DESKeySpec.isWeak(oneKey, 0)) { |
| 357 | keyValue[i+7] = (byte)(keyValue[i+7] ^ 0xF0); |
| 358 | } |
| 359 | } |
| 360 | } |
| 361 | } catch (GeneralSecurityException e) { |
| 362 | KrbCryptoException ke = new KrbCryptoException(e.getMessage()); |
| 363 | ke.initCause(e); |
| 364 | throw ke; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Constructs an instance of EncryptionKey type. |
| 370 | * @param encoding a single DER-encoded value. |
| 371 | * @exception Asn1Exception if an error occurs while decoding an ASN1 |
| 372 | * encoded data. |
| 373 | * @exception IOException if an I/O error occurs while reading encoded |
| 374 | * data. |
| 375 | * |
| 376 | * |
| 377 | */ |
| 378 | // Used in javax.security.auth.kerberos.KeyImpl |
| 379 | public EncryptionKey(DerValue encoding) throws Asn1Exception, IOException { |
| 380 | DerValue der; |
| 381 | if (encoding.getTag() != DerValue.tag_Sequence) { |
| 382 | throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| 383 | } |
| 384 | der = encoding.getData().getDerValue(); |
| 385 | if ((der.getTag() & (byte)0x1F) == (byte)0x00) { |
| 386 | keyType = der.getData().getBigInteger().intValue(); |
| 387 | } |
| 388 | else |
| 389 | throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| 390 | der = encoding.getData().getDerValue(); |
| 391 | if ((der.getTag() & (byte)0x1F) == (byte)0x01) { |
| 392 | keyValue = der.getData().getOctetString(); |
| 393 | } |
| 394 | else |
| 395 | throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| 396 | if (der.getData().available() > 0) { |
| 397 | throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * Returns the ASN.1 encoding of this EncryptionKey. |
| 403 | * |
| 404 | * <xmp> |
| 405 | * EncryptionKey ::= SEQUENCE { |
| 406 | * keytype[0] INTEGER, |
| 407 | * keyvalue[1] OCTET STRING } |
| 408 | * </xmp> |
| 409 | * |
| 410 | * <p> |
| 411 | * This definition reflects the Network Working Group RFC 4120 |
| 412 | * specification available at |
| 413 | * <a href="http://www.ietf.org/rfc/rfc4120.txt"> |
| 414 | * http://www.ietf.org/rfc/rfc4120.txt</a>. |
| 415 | * |
| 416 | * @return byte array of encoded EncryptionKey object. |
| 417 | * @exception Asn1Exception if an error occurs while decoding an ASN1 |
| 418 | * encoded data. |
| 419 | * @exception IOException if an I/O error occurs while reading encoded |
| 420 | * data. |
| 421 | * |
| 422 | */ |
| 423 | public synchronized byte[] asn1Encode() throws Asn1Exception, IOException { |
| 424 | DerOutputStream bytes = new DerOutputStream(); |
| 425 | DerOutputStream temp = new DerOutputStream(); |
| 426 | temp.putInteger(keyType); |
| 427 | bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, |
| 428 | (byte)0x00), temp); |
| 429 | temp = new DerOutputStream(); |
| 430 | temp.putOctetString(keyValue); |
| 431 | bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, |
| 432 | (byte)0x01), temp); |
| 433 | temp = new DerOutputStream(); |
| 434 | temp.write(DerValue.tag_Sequence, bytes); |
| 435 | return temp.toByteArray(); |
| 436 | } |
| 437 | |
| 438 | public synchronized void destroy() { |
| 439 | if (keyValue != null) |
| 440 | for (int i = 0; i < keyValue.length; i++) |
| 441 | keyValue[i] = 0; |
| 442 | } |
| 443 | |
| 444 | |
| 445 | /** |
| 446 | * Parse (unmarshal) an Encryption key from a DER input stream. This form |
| 447 | * parsing might be used when expanding a value which is part of |
| 448 | * a constructed sequence and uses explicitly tagged type. |
| 449 | * |
| 450 | * @param data the Der input stream value, which contains one or more |
| 451 | * marshaled value. |
| 452 | * @param explicitTag tag number. |
| 453 | * @param optional indicate if this data field is optional |
| 454 | * @exception Asn1Exception if an error occurs while decoding an ASN1 |
| 455 | * encoded data. |
| 456 | * @exception IOException if an I/O error occurs while reading encoded |
| 457 | * data. |
| 458 | * @return an instance of EncryptionKey. |
| 459 | * |
| 460 | */ |
| 461 | public static EncryptionKey parse(DerInputStream data, byte |
| 462 | explicitTag, boolean optional) throws |
| 463 | Asn1Exception, IOException { |
| 464 | if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != |
| 465 | explicitTag)) { |
| 466 | return null; |
| 467 | } |
| 468 | DerValue der = data.getDerValue(); |
| 469 | if (explicitTag != (der.getTag() & (byte)0x1F)) { |
| 470 | throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| 471 | } else { |
| 472 | DerValue subDer = der.getData().getDerValue(); |
| 473 | return new EncryptionKey(subDer); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * Writes key value in FCC format to a <code>CCacheOutputStream</code>. |
| 479 | * |
| 480 | * @param cos a <code>CCacheOutputStream</code> to be written to. |
| 481 | * @exception IOException if an I/O exception occurs. |
| 482 | * @see sun.security.krb5.internal.ccache.CCacheOutputStream |
| 483 | * |
| 484 | */ |
| 485 | public synchronized void writeKey(CCacheOutputStream cos) |
| 486 | throws IOException { |
| 487 | |
| 488 | cos.write16(keyType); |
| 489 | // we use KRB5_FCC_FVNO_3 |
| 490 | cos.write16(keyType); // key type is recorded twice. |
| 491 | cos.write32(keyValue.length); |
| 492 | for (int i = 0; i < keyValue.length; i++) { |
| 493 | cos.write8(keyValue[i]); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | public String toString() { |
| 498 | return new String("EncryptionKey: keyType=" + keyType |
| 499 | + " kvno=" + kvno |
| 500 | + " keyValue (hex dump)=" |
| 501 | + (keyValue == null || keyValue.length == 0 ? |
| 502 | " Empty Key" : '\n' + Krb5.hexDumper.encode(keyValue) |
| 503 | + '\n')); |
| 504 | } |
| 505 | |
| 506 | public static EncryptionKey findKey(int etype, EncryptionKey[] keys) |
| 507 | throws KrbException { |
| 508 | |
| 509 | // check if encryption type is supported |
| 510 | if (!EType.isSupported(etype)) { |
| 511 | throw new KrbException("Encryption type " + |
| 512 | EType.toString(etype) + " is not supported/enabled"); |
| 513 | } |
| 514 | |
| 515 | int ktype; |
| 516 | for (int i = 0; i < keys.length; i++) { |
| 517 | ktype = keys[i].getEType(); |
| 518 | if (EType.isSupported(ktype)) { |
| 519 | if (etype == ktype) { |
| 520 | return keys[i]; |
| 521 | } |
| 522 | } |
| 523 | } |
| 524 | // Key not found. |
| 525 | // allow DES key to be used for the DES etypes |
| 526 | if ((etype == EncryptedData.ETYPE_DES_CBC_CRC || |
| 527 | etype == EncryptedData.ETYPE_DES_CBC_MD5)) { |
| 528 | for (int i = 0; i < keys.length; i++) { |
| 529 | ktype = keys[i].getEType(); |
| 530 | if (ktype == EncryptedData.ETYPE_DES_CBC_CRC || |
| 531 | ktype == EncryptedData.ETYPE_DES_CBC_MD5) { |
| 532 | return new EncryptionKey(etype, keys[i].getBytes()); |
| 533 | } |
| 534 | } |
| 535 | } |
| 536 | return null; |
| 537 | } |
| 538 | } |