Showing the changes to java/pkg/com/sun/crypto/provider/PBECipherCore.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,541 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2007, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.crypto.provider; | ||
| 27 | |||
| 28 | import java.io.UnsupportedEncodingException; | ||
| 29 | import java.security.*; | ||
| 30 | import java.security.spec.*; | ||
| 31 | import javax.crypto.*; | ||
| 32 | import javax.crypto.spec.*; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * This class represents password-based encryption as defined by the PKCS #5 | ||
| 36 | * standard. | ||
| 37 | * | ||
| 38 | * @author Jan Luehe | ||
| 39 | * | ||
| 40 | * | ||
| 41 | * @see javax.crypto.Cipher | ||
| 42 | */ | ||
| 43 | final class PBECipherCore { | ||
| 44 | |||
| 45 | // the encapsulated DES cipher | ||
| 46 | private CipherCore cipher; | ||
| 47 | private MessageDigest md; | ||
| 48 | private int blkSize; | ||
| 49 | private String algo = null; | ||
| 50 | private byte[] salt = null; | ||
| 51 | private int iCount = 10; | ||
| 52 | |||
| 53 | /** | ||
| 54 | * Creates an instance of PBE Cipher using the specified CipherSpi | ||
| 55 | * instance. | ||
| 56 | * | ||
| 57 | */ | ||
| 58 | PBECipherCore(String cipherAlg) throws NoSuchAlgorithmException, | ||
| 59 | NoSuchPaddingException { | ||
| 60 | algo = cipherAlg; | ||
| 61 | if (algo.equals("DES")) { | ||
| 62 | cipher = new CipherCore(new DESCrypt(), | ||
| 63 | DESConstants.DES_BLOCK_SIZE); | ||
| 64 | } else if (algo.equals("DESede")) { | ||
| 65 | |||
| 66 | cipher = new CipherCore(new DESedeCrypt(), | ||
| 67 | DESConstants.DES_BLOCK_SIZE); | ||
| 68 | } else { | ||
| 69 | throw new NoSuchAlgorithmException("No Cipher implementation " + | ||
| 70 | "for PBEWithMD5And" + algo); | ||
| 71 | } | ||
| 72 | cipher.setMode("CBC"); | ||
| 73 | cipher.setPadding("PKCS5Padding"); | ||
| 74 | // get instance of MD5 | ||
| 75 | md = MessageDigest.getInstance("MD5"); | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Sets the mode of this cipher. This algorithm can only be run in CBC | ||
| 80 | * mode. | ||
| 81 | * | ||
| 82 | * @param mode the cipher mode | ||
| 83 | * | ||
| 84 | * @exception NoSuchAlgorithmException if the requested cipher mode is | ||
| 85 | * invalid | ||
| 86 | */ | ||
| 87 | void setMode(String mode) throws NoSuchAlgorithmException { | ||
| 88 | cipher.setMode(mode); | ||
| 89 | } | ||
| 90 | |||
| 91 | /** | ||
| 92 | * Sets the padding mechanism of this cipher. This algorithm only uses | ||
| 93 | * PKCS #5 padding. | ||
| 94 | * | ||
| 95 | * @param padding the padding mechanism | ||
| 96 | * | ||
| 97 | * @exception NoSuchPaddingException if the requested padding mechanism | ||
| 98 | * is invalid | ||
| 99 | */ | ||
| 100 | void setPadding(String paddingScheme) throws NoSuchPaddingException { | ||
| 101 | cipher.setPadding(paddingScheme); | ||
| 102 | } | ||
| 103 | |||
| 104 | /** | ||
| 105 | * Returns the block size (in bytes). | ||
| 106 | * | ||
| 107 | * @return the block size (in bytes) | ||
| 108 | */ | ||
| 109 | int getBlockSize() { | ||
| 110 | return DESConstants.DES_BLOCK_SIZE; | ||
| 111 | } | ||
| 112 | |||
| 113 | /** | ||
| 114 | * Returns the length in bytes that an output buffer would need to be in | ||
| 115 | * order to hold the result of the next <code>update</code> or | ||
| 116 | * <code>doFinal</code> operation, given the input length | ||
| 117 | * <code>inputLen</code> (in bytes). | ||
| 118 | * | ||
| 119 | * <p>This call takes into account any unprocessed (buffered) data from a | ||
| 120 | * previous <code>update</code> call, and padding. | ||
| 121 | * | ||
| 122 | * <p>The actual output length of the next <code>update</code> or | ||
| 123 | * <code>doFinal</code> call may be smaller than the length returned by | ||
| 124 | * this method. | ||
| 125 | * | ||
| 126 | * @param inputLen the input length (in bytes) | ||
| 127 | * | ||
| 128 | * @return the required output buffer size (in bytes) | ||
| 129 | * | ||
| 130 | */ | ||
| 131 | int getOutputSize(int inputLen) { | ||
| 132 | return cipher.getOutputSize(inputLen); | ||
| 133 | } | ||
| 134 | |||
| 135 | /** | ||
| 136 | * Returns the initialization vector (IV) in a new buffer. | ||
| 137 | * | ||
| 138 | * <p> This is useful in the case where a random IV has been created | ||
| 139 | * (see <a href = "#init">init</a>), | ||
| 140 | * or in the context of password-based encryption or | ||
| 141 | * decryption, where the IV is derived from a user-supplied password. | ||
| 142 | * | ||
| 143 | * @return the initialization vector in a new buffer, or null if the | ||
| 144 | * underlying algorithm does not use an IV, or if the IV has not yet | ||
| 145 | * been set. | ||
| 146 | */ | ||
| 147 | byte[] getIV() { | ||
| 148 | return cipher.getIV(); | ||
| 149 | } | ||
| 150 | |||
| 151 | /** | ||
| 152 | * Returns the parameters used with this cipher. | ||
| 153 | * | ||
| 154 | * <p>The returned parameters may be the same that were used to initialize | ||
| 155 | * this cipher, or may contain the default set of parameters or a set of | ||
| 156 | * randomly generated parameters used by the underlying cipher | ||
| 157 | * implementation (provided that the underlying cipher implementation | ||
| 158 | * uses a default set of parameters or creates new parameters if it needs | ||
| 159 | * parameters but was not initialized with any). | ||
| 160 | * | ||
| 161 | * @return the parameters used with this cipher, or null if this cipher | ||
| 162 | * does not use any parameters. | ||
| 163 | */ | ||
| 164 | AlgorithmParameters getParameters() { | ||
| 165 | AlgorithmParameters params = null; | ||
| 166 | if (salt == null) { | ||
| 167 | salt = new byte[8]; | ||
| 168 | SunJCE.RANDOM.nextBytes(salt); | ||
| 169 | } | ||
| 170 | PBEParameterSpec pbeSpec = new PBEParameterSpec(salt, iCount); | ||
| 171 | try { | ||
| 172 | params = AlgorithmParameters.getInstance("PBEWithMD5And" + | ||
| 173 | (algo.equalsIgnoreCase("DES")? "DES":"TripleDES"), "SunJCE"); | ||
| 174 | } catch (NoSuchAlgorithmException nsae) { | ||
| 175 | // should never happen | ||
| 176 | throw new RuntimeException("SunJCE called, but not configured"); | ||
| 177 | } catch (NoSuchProviderException nspe) { | ||
| 178 | // should never happen | ||
| 179 | throw new RuntimeException("SunJCE called, but not configured"); | ||
| 180 | } | ||
| 181 | try { | ||
| 182 | params.init(pbeSpec); | ||
| 183 | } catch (InvalidParameterSpecException ipse) { | ||
| 184 | // should never happen | ||
| 185 | throw new RuntimeException("PBEParameterSpec not supported"); | ||
| 186 | } | ||
| 187 | return params; | ||
| 188 | } | ||
| 189 | |||
| 190 | /** | ||
| 191 | * Initializes this cipher with a key, a set of | ||
| 192 | * algorithm parameters, and a source of randomness. | ||
| 193 | * The cipher is initialized for one of the following four operations: | ||
| 194 | * encryption, decryption, key wrapping or key unwrapping, depending on | ||
| 195 | * the value of <code>opmode</code>. | ||
| 196 | * | ||
| 197 | * <p>If this cipher (including its underlying feedback or padding scheme) | ||
| 198 | * requires any random bytes, it will get them from <code>random</code>. | ||
| 199 | * | ||
| 200 | * @param opmode the operation mode of this cipher (this is one of | ||
| 201 | * the following: | ||
| 202 | * <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>), | ||
| 203 | * <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>) | ||
| 204 | * @param key the encryption key | ||
| 205 | * @param params the algorithm parameters | ||
| 206 | * @param random the source of randomness | ||
| 207 | * | ||
| 208 | * @exception InvalidKeyException if the given key is inappropriate for | ||
| 209 | * initializing this cipher | ||
| 210 | * @exception InvalidAlgorithmParameterException if the given algorithm | ||
| 211 | * parameters are inappropriate for this cipher | ||
| 212 | */ | ||
| 213 | void init(int opmode, Key key, AlgorithmParameterSpec params, | ||
| 214 | SecureRandom random) | ||
| 215 | throws InvalidKeyException, InvalidAlgorithmParameterException { | ||
| 216 | if (((opmode == Cipher.DECRYPT_MODE) || | ||
| 217 | (opmode == Cipher.UNWRAP_MODE)) && (params == null)) { | ||
| 218 | throw new InvalidAlgorithmParameterException("Parameters " | ||
| 219 | + "missing"); | ||
| 220 | } | ||
| 221 | if ((key == null) || | ||
| 222 | (key.getEncoded() == null) || | ||
| 223 | !(key.getAlgorithm().regionMatches(true, 0, "PBE", 0, 3))) { | ||
| 224 | throw new InvalidKeyException("Missing password"); | ||
| 225 | } | ||
| 226 | |||
| 227 | if (params == null) { | ||
| 228 | // create random salt and use default iteration count | ||
| 229 | salt = new byte[8]; | ||
| 230 | random.nextBytes(salt); | ||
| 231 | } else { | ||
| 232 | if (!(params instanceof PBEParameterSpec)) { | ||
| 233 | throw new InvalidAlgorithmParameterException | ||
| 234 | ("Wrong parameter type: PBE expected"); | ||
| 235 | } | ||
| 236 | salt = ((PBEParameterSpec) params).getSalt(); | ||
| 237 | // salt must be 8 bytes long (by definition) | ||
| 238 | if (salt.length != 8) { | ||
| 239 | throw new InvalidAlgorithmParameterException | ||
| 240 | ("Salt must be 8 bytes long"); | ||
| 241 | } | ||
| 242 | iCount = ((PBEParameterSpec) params).getIterationCount(); | ||
| 243 | if (iCount <= 0) { | ||
| 244 | throw new InvalidAlgorithmParameterException | ||
| 245 | ("IterationCount must be a positive number"); | ||
| 246 | } | ||
| 247 | } | ||
| 248 | |||
| 249 | byte[] derivedKey = deriveCipherKey(key); | ||
| 250 | // use all but the last 8 bytes as the key value | ||
| 251 | SecretKeySpec cipherKey = new SecretKeySpec(derivedKey, 0, | ||
| 252 | derivedKey.length-8, algo); | ||
| 253 | // use the last 8 bytes as the IV | ||
| 254 | IvParameterSpec ivSpec = new IvParameterSpec(derivedKey, | ||
| 255 | derivedKey.length-8, | ||
| 256 | 8); | ||
| 257 | // initialize the underlying cipher | ||
| 258 | cipher.init(opmode, cipherKey, ivSpec, random); | ||
| 259 | } | ||
| 260 | |||
| 261 | private byte[] deriveCipherKey(Key key) { | ||
| 262 | |||
| 263 | byte[] result = null; | ||
| 264 | byte[] passwdBytes = key.getEncoded(); | ||
| 265 | |||
| 266 | if (algo.equals("DES")) { | ||
| 267 | // P || S (password concatenated with salt) | ||
| 268 | byte[] concat = new byte[passwdBytes.length + salt.length]; | ||
| 269 | System.arraycopy(passwdBytes, 0, concat, 0, passwdBytes.length); | ||
| 270 | java.util.Arrays.fill(passwdBytes, (byte)0x00); | ||
| 271 | System.arraycopy(salt, 0, concat, passwdBytes.length, salt.length); | ||
| 272 | |||
| 273 | // digest P || S with c iterations | ||
| 274 | byte[] toBeHashed = concat; | ||
| 275 | for (int i = 0; i < iCount; i++) { | ||
| 276 | md.update(toBeHashed); | ||
| 277 | toBeHashed = md.digest(); // this resets the digest | ||
| 278 | } | ||
| 279 | java.util.Arrays.fill(concat, (byte)0x00); | ||
| 280 | result = toBeHashed; | ||
| 281 | } else if (algo.equals("DESede")) { | ||
| 282 | // if the 2 salt halves are the same, invert one of them | ||
| 283 | int i; | ||
| 284 | for (i=0; i<4; i++) { | ||
| 285 | if (salt[i] != salt[i+4]) | ||
| 286 | break; | ||
| 287 | } | ||
| 288 | if (i==4) { // same, invert 1st half | ||
| 289 | for (i=0; i<2; i++) { | ||
| 290 | byte tmp = salt[i]; | ||
| 291 | salt[i] = salt[3-i]; | ||
| 292 | salt[3-1] = tmp; | ||
| 293 | } | ||
| 294 | } | ||
| 295 | |||
| 296 | // Now digest each half (concatenated with password). For each | ||
| 297 | // half, go through the loop as many times as specified by the | ||
| 298 | // iteration count parameter (inner for loop). | ||
| 299 | // Concatenate the output from each digest round with the | ||
| 300 | // password, and use the result as the input to the next digest | ||
| 301 | // operation. | ||
| 302 | byte[] kBytes = null; | ||
| 303 | IvParameterSpec iv = null; | ||
| 304 | byte[] toBeHashed = null; | ||
| 305 | result = new byte[DESedeKeySpec.DES_EDE_KEY_LEN + | ||
| 306 | DESConstants.DES_BLOCK_SIZE]; | ||
| 307 | for (i = 0; i < 2; i++) { | ||
| 308 | toBeHashed = new byte[salt.length/2]; | ||
| 309 | System.arraycopy(salt, i*(salt.length/2), toBeHashed, 0, | ||
| 310 | toBeHashed.length); | ||
| 311 | for (int j=0; j < iCount; j++) { | ||
| 312 | md.update(toBeHashed); | ||
| 313 | md.update(passwdBytes); | ||
| 314 | toBeHashed = md.digest(); // this resets the digest | ||
| 315 | } | ||
| 316 | System.arraycopy(toBeHashed, 0, result, i*16, | ||
| 317 | toBeHashed.length); | ||
| 318 | } | ||
| 319 | } | ||
| 320 | return result; | ||
| 321 | } | ||
| 322 | |||
| 323 | void init(int opmode, Key key, AlgorithmParameters params, | ||
| 324 | SecureRandom random) | ||
| 325 | throws InvalidKeyException, InvalidAlgorithmParameterException { | ||
| 326 | PBEParameterSpec pbeSpec = null; | ||
| 327 | if (params != null) { | ||
| 328 | try { | ||
| 329 | pbeSpec = (PBEParameterSpec) params.getParameterSpec | ||
| 330 | (PBEParameterSpec.class); | ||
| 331 | } catch (InvalidParameterSpecException ipse) { | ||
| 332 | throw new InvalidAlgorithmParameterException("Wrong parameter " | ||
| 333 | + "type: PBE " | ||
| 334 | + "expected"); | ||
| 335 | } | ||
| 336 | } | ||
| 337 | init(opmode, key, pbeSpec, random); | ||
| 338 | } | ||
| 339 | |||
| 340 | /** | ||
| 341 | * Continues a multiple-part encryption or decryption operation | ||
| 342 | * (depending on how this cipher was initialized), processing another data | ||
| 343 | * part. | ||
| 344 | * | ||
| 345 | * <p>The first <code>inputLen</code> bytes in the <code>input</code> | ||
| 346 | * buffer, starting at <code>inputOffset</code>, are processed, and the | ||
| 347 | * result is stored in a new buffer. | ||
| 348 | * | ||
| 349 | * @param input the input buffer | ||
| 350 | * @param inputOffset the offset in <code>input</code> where the input | ||
| 351 | * starts | ||
| 352 | * @param inputLen the input length | ||
| 353 | * | ||
| 354 | * @return the new buffer with the result | ||
| 355 | * | ||
| 356 | */ | ||
| 357 | byte[] update(byte[] input, int inputOffset, int inputLen) { | ||
| 358 | return cipher.update(input, inputOffset, inputLen); | ||
| 359 | } | ||
| 360 | |||
| 361 | /** | ||
| 362 | * Continues a multiple-part encryption or decryption operation | ||
| 363 | * (depending on how this cipher was initialized), processing another data | ||
| 364 | * part. | ||
| 365 | * | ||
| 366 | * <p>The first <code>inputLen</code> bytes in the <code>input</code> | ||
| 367 | * buffer, starting at <code>inputOffset</code>, are processed, and the | ||
| 368 | * result is stored in the <code>output</code> buffer, starting at | ||
| 369 | * <code>outputOffset</code>. | ||
| 370 | * | ||
| 371 | * @param input the input buffer | ||
| 372 | * @param inputOffset the offset in <code>input</code> where the input | ||
| 373 | * starts | ||
| 374 | * @param inputLen the input length | ||
| 375 | * @param output the buffer for the result | ||
| 376 | * @param outputOffset the offset in <code>output</code> where the result | ||
| 377 | * is stored | ||
| 378 | * | ||
| 379 | * @return the number of bytes stored in <code>output</code> | ||
| 380 | * | ||
| 381 | * @exception ShortBufferException if the given output buffer is too small | ||
| 382 | * to hold the result | ||
| 383 | */ | ||
| 384 | int update(byte[] input, int inputOffset, int inputLen, | ||
| 385 | byte[] output, int outputOffset) | ||
| 386 | throws ShortBufferException { | ||
| 387 | return cipher.update(input, inputOffset, inputLen, | ||
| 388 | output, outputOffset); | ||
| 389 | } | ||
| 390 | |||
| 391 | /** | ||
| 392 | * Encrypts or decrypts data in a single-part operation, | ||
| 393 | * or finishes a multiple-part operation. | ||
| 394 | * The data is encrypted or decrypted, depending on how this cipher was | ||
| 395 | * initialized. | ||
| 396 | * | ||
| 397 | * <p>The first <code>inputLen</code> bytes in the <code>input</code> | ||
| 398 | * buffer, starting at <code>inputOffset</code>, and any input bytes that | ||
| 399 | * may have been buffered during a previous <code>update</code> operation, | ||
| 400 | * are processed, with padding (if requested) being applied. | ||
| 401 | * The result is stored in a new buffer. | ||
| 402 | * | ||
| 403 | * <p>The cipher is reset to its initial state (uninitialized) after this | ||
| 404 | * call. | ||
| 405 | * | ||
| 406 | * @param input the input buffer | ||
| 407 | * @param inputOffset the offset in <code>input</code> where the input | ||
| 408 | * starts | ||
| 409 | * @param inputLen the input length | ||
| 410 | * | ||
| 411 | * @return the new buffer with the result | ||
| 412 | * | ||
| 413 | * @exception IllegalBlockSizeException if this cipher is a block cipher, | ||
| 414 | * no padding has been requested (only in encryption mode), and the total | ||
| 415 | * input length of the data processed by this cipher is not a multiple of | ||
| 416 | * block size | ||
| 417 | * @exception BadPaddingException if decrypting and padding is choosen, | ||
| 418 | * but the last input data does not have proper padding bytes. | ||
| 419 | */ | ||
| 420 | byte[] doFinal(byte[] input, int inputOffset, int inputLen) | ||
| 421 | throws IllegalBlockSizeException, BadPaddingException { | ||
| 422 | return cipher.doFinal(input, inputOffset, inputLen); | ||
| 423 | } | ||
| 424 | |||
| 425 | /** | ||
| 426 | * Encrypts or decrypts data in a single-part operation, | ||
| 427 | * or finishes a multiple-part operation. | ||
| 428 | * The data is encrypted or decrypted, depending on how this cipher was | ||
| 429 | * initialized. | ||
| 430 | * | ||
| 431 | * <p>The first <code>inputLen</code> bytes in the <code>input</code> | ||
| 432 | * buffer, starting at <code>inputOffset</code>, and any input bytes that | ||
| 433 | * may have been buffered during a previous <code>update</code> operation, | ||
| 434 | * are processed, with padding (if requested) being applied. | ||
| 435 | * The result is stored in the <code>output</code> buffer, starting at | ||
| 436 | * <code>outputOffset</code>. | ||
| 437 | * | ||
| 438 | * <p>The cipher is reset to its initial state (uninitialized) after this | ||
| 439 | * call. | ||
| 440 | * | ||
| 441 | * @param input the input buffer | ||
| 442 | * @param inputOffset the offset in <code>input</code> where the input | ||
| 443 | * starts | ||
| 444 | * @param inputLen the input length | ||
| 445 | * @param output the buffer for the result | ||
| 446 | * @param outputOffset the offset in <code>output</code> where the result | ||
| 447 | * is stored | ||
| 448 | * | ||
| 449 | * @return the number of bytes stored in <code>output</code> | ||
| 450 | * | ||
| 451 | * @exception IllegalBlockSizeException if this cipher is a block cipher, | ||
| 452 | * no padding has been requested (only in encryption mode), and the total | ||
| 453 | * input length of the data processed by this cipher is not a multiple of | ||
| 454 | * block size | ||
| 455 | * @exception ShortBufferException if the given output buffer is too small | ||
| 456 | * to hold the result | ||
| 457 | * @exception BadPaddingException if decrypting and padding is choosen, | ||
| 458 | * but the last input data does not have proper padding bytes. | ||
| 459 | */ | ||
| 460 | int doFinal(byte[] input, int inputOffset, int inputLen, | ||
| 461 | byte[] output, int outputOffset) | ||
| 462 | throws ShortBufferException, IllegalBlockSizeException, | ||
| 463 | BadPaddingException { | ||
| 464 | return cipher.doFinal(input, inputOffset, inputLen, | ||
| 465 | output, outputOffset); | ||
| 466 | } | ||
| 467 | |||
| 468 | /** | ||
| 469 | * Wrap a key. | ||
| 470 | * | ||
| 471 | * @param key the key to be wrapped. | ||
| 472 | * | ||
| 473 | * @return the wrapped key. | ||
| 474 | * | ||
| 475 | * @exception IllegalBlockSizeException if this cipher is a block | ||
| 476 | * cipher, no padding has been requested, and the length of the | ||
| 477 | * encoding of the key to be wrapped is not a | ||
| 478 | * multiple of the block size. | ||
| 479 | * | ||
| 480 | * @exception InvalidKeyException if it is impossible or unsafe to | ||
| 481 | * wrap the key with this cipher (e.g., a hardware protected key is | ||
| 482 | * being passed to a software only cipher). | ||
| 483 | */ | ||
| 484 | byte[] wrap(Key key) | ||
| 485 | throws IllegalBlockSizeException, InvalidKeyException { | ||
| 486 | byte[] result = null; | ||
| 487 | |||
| 488 | try { | ||
| 489 | byte[] encodedKey = key.getEncoded(); | ||
| 490 | if ((encodedKey == null) || (encodedKey.length == 0)) { | ||
| 491 | throw new InvalidKeyException("Cannot get an encoding of " + | ||
| 492 | "the key to be wrapped"); | ||
| 493 | } | ||
| 494 | |||
| 495 | result = doFinal(encodedKey, 0, encodedKey.length); | ||
| 496 | } catch (BadPaddingException e) { | ||
| 497 | // Should never happen | ||
| 498 | } | ||
| 499 | |||
| 500 | return result; | ||
| 501 | } | ||
| 502 | |||
| 503 | /** | ||
| 504 | * Unwrap a previously wrapped key. | ||
| 505 | * | ||
| 506 | * @param wrappedKey the key to be unwrapped. | ||
| 507 | * | ||
| 508 | * @param wrappedKeyAlgorithm the algorithm the wrapped key is for. | ||
| 509 | * | ||
| 510 | * @param wrappedKeyType the type of the wrapped key. | ||
| 511 | * This is one of <code>Cipher.SECRET_KEY</code>, | ||
| 512 | * <code>Cipher.PRIVATE_KEY</code>, or <code>Cipher.PUBLIC_KEY</code>. | ||
| 513 | * | ||
| 514 | * @return the unwrapped key. | ||
| 515 | * | ||
| 516 | * @exception NoSuchAlgorithmException if no installed providers | ||
| 517 | * can create keys of type <code>wrappedKeyType</code> for the | ||
| 518 | * <code>wrappedKeyAlgorithm</code>. | ||
| 519 | * | ||
| 520 | * @exception InvalidKeyException if <code>wrappedKey</code> does not | ||
| 521 | * represent a wrapped key of type <code>wrappedKeyType</code> for | ||
| 522 | * the <code>wrappedKeyAlgorithm</code>. | ||
| 523 | */ | ||
| 524 | Key unwrap(byte[] wrappedKey, | ||
| 525 | String wrappedKeyAlgorithm, | ||
| 526 | int wrappedKeyType) | ||
| 527 | throws InvalidKeyException, NoSuchAlgorithmException { | ||
| 528 | byte[] encodedKey; | ||
| 529 | try { | ||
| 530 | encodedKey = doFinal(wrappedKey, 0, wrappedKey.length); | ||
| 531 | } catch (BadPaddingException ePadding) { | ||
| 532 | throw new InvalidKeyException("The wrapped key is not padded " + | ||
| 533 | "correctly"); | ||
| 534 | } catch (IllegalBlockSizeException eBlockSize) { | ||
| 535 | throw new InvalidKeyException("The wrapped key does not have " + | ||
| 536 | "the correct length"); | ||
| 537 | } | ||
| 538 | return ConstructKeys.constructKey(encodedKey, wrappedKeyAlgorithm, | ||
| 539 | wrappedKeyType); | ||
| 540 | } | ||
| 541 | } | ||