Showing the changes to java/pkg/com/sun/crypto/provider/RSACipher.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,444 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2009, 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.util.Locale; | ||
| 29 | |||
| 30 | import java.security.*; | ||
| 31 | import java.security.interfaces.*; | ||
| 32 | import java.security.spec.AlgorithmParameterSpec; | ||
| 33 | import java.security.spec.InvalidParameterSpecException; | ||
| 34 | import java.security.spec.MGF1ParameterSpec; | ||
| 35 | |||
| 36 | import javax.crypto.*; | ||
| 37 | import javax.crypto.spec.PSource; | ||
| 38 | import javax.crypto.spec.OAEPParameterSpec; | ||
| 39 | |||
| 40 | import sun.security.rsa.*; | ||
| 41 | import sun.security.jca.Providers; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * RSA cipher implementation. Supports RSA en/decryption and signing/verifying | ||
| 45 | * using PKCS#1 v1.5 padding and without padding (raw RSA). Note that raw RSA | ||
| 46 | * is supported mostly for completeness and should only be used in rare cases. | ||
| 47 | * | ||
| 48 | * Objects should be instantiated by calling Cipher.getInstance() using the | ||
| 49 | * following algorithm names: | ||
| 50 | * . "RSA/ECB/PKCS1Padding" (or "RSA") for PKCS#1 padding. The mode (blocktype) | ||
| 51 | * is selected based on the en/decryption mode and public/private key used | ||
| 52 | * . "RSA/ECB/NoPadding" for rsa RSA. | ||
| 53 | * | ||
| 54 | * We only do one RSA operation per doFinal() call. If the application passes | ||
| 55 | * more data via calls to update() or doFinal(), we throw an | ||
| 56 | * IllegalBlockSizeException when doFinal() is called (see JCE API spec). | ||
| 57 | * Bulk encryption using RSA does not make sense and is not standardized. | ||
| 58 | * | ||
| 59 | * Note: RSA keys should be at least 512 bits long | ||
| 60 | * | ||
| 61 | * @since 1.5 | ||
| 62 | * @author Andreas Sterbenz | ||
| 63 | */ | ||
| 64 | public final class RSACipher extends CipherSpi { | ||
| 65 | |||
| 66 | // constant for an empty byte array | ||
| 67 | private final static byte[] B0 = new byte[0]; | ||
| 68 | |||
| 69 | // mode constant for public key encryption | ||
| 70 | private final static int MODE_ENCRYPT = 1; | ||
| 71 | // mode constant for private key decryption | ||
| 72 | private final static int MODE_DECRYPT = 2; | ||
| 73 | // mode constant for private key encryption (signing) | ||
| 74 | private final static int MODE_SIGN = 3; | ||
| 75 | // mode constant for public key decryption (verifying) | ||
| 76 | private final static int MODE_VERIFY = 4; | ||
| 77 | |||
| 78 | // constant for raw RSA | ||
| 79 | private final static String PAD_NONE = "NoPadding"; | ||
| 80 | // constant for PKCS#1 v1.5 RSA | ||
| 81 | private final static String PAD_PKCS1 = "PKCS1Padding"; | ||
| 82 | // constant for PKCS#2 v2.0 OAEP with MGF1 | ||
| 83 | private final static String PAD_OAEP_MGF1 = "OAEP"; | ||
| 84 | |||
| 85 | // current mode, one of MODE_* above. Set when init() is called | ||
| 86 | private int mode; | ||
| 87 | |||
| 88 | // active padding type, one of PAD_* above. Set by setPadding() | ||
| 89 | private String paddingType; | ||
| 90 | |||
| 91 | // padding object | ||
| 92 | private RSAPadding padding; | ||
| 93 | |||
| 94 | // cipher parameter for OAEP padding | ||
| 95 | private OAEPParameterSpec spec = null; | ||
| 96 | |||
| 97 | // buffer for the data | ||
| 98 | private byte[] buffer; | ||
| 99 | // offset into the buffer (number of bytes buffered) | ||
| 100 | private int bufOfs; | ||
| 101 | |||
| 102 | // size of the output | ||
| 103 | private int outputSize; | ||
| 104 | |||
| 105 | // the public key, if we were initialized using a public key | ||
| 106 | private RSAPublicKey publicKey; | ||
| 107 | // the private key, if we were initialized using a private key | ||
| 108 | private RSAPrivateKey privateKey; | ||
| 109 | |||
| 110 | // hash algorithm for OAEP | ||
| 111 | private String oaepHashAlgorithm = "SHA-1"; | ||
| 112 | |||
| 113 | public RSACipher() { | ||
| 114 | paddingType = PAD_PKCS1; | ||
| 115 | } | ||
| 116 | |||
| 117 | // modes do not make sense for RSA, but allow ECB | ||
| 118 | // see JCE spec | ||
| 119 | protected void engineSetMode(String mode) throws NoSuchAlgorithmException { | ||
| 120 | if (mode.equalsIgnoreCase("ECB") == false) { | ||
| 121 | throw new NoSuchAlgorithmException("Unsupported mode " + mode); | ||
| 122 | } | ||
| 123 | } | ||
| 124 | |||
| 125 | // set the padding type | ||
| 126 | // see JCE spec | ||
| 127 | protected void engineSetPadding(String paddingName) | ||
| 128 | throws NoSuchPaddingException { | ||
| 129 | if (paddingName.equalsIgnoreCase(PAD_NONE)) { | ||
| 130 | paddingType = PAD_NONE; | ||
| 131 | } else if (paddingName.equalsIgnoreCase(PAD_PKCS1)) { | ||
| 132 | paddingType = PAD_PKCS1; | ||
| 133 | } else { | ||
| 134 | String lowerPadding = paddingName.toLowerCase(Locale.ENGLISH); | ||
| 135 | if (lowerPadding.equals("oaeppadding")) { | ||
| 136 | paddingType = PAD_OAEP_MGF1; | ||
| 137 | } else if (lowerPadding.startsWith("oaepwith") && | ||
| 138 | lowerPadding.endsWith("andmgf1padding")) { | ||
| 139 | paddingType = PAD_OAEP_MGF1; | ||
| 140 | // "oaepwith".length() == 8 | ||
| 141 | // "andmgf1padding".length() == 14 | ||
| 142 | oaepHashAlgorithm = | ||
| 143 | paddingName.substring(8, paddingName.length() - 14); | ||
| 144 | // check if MessageDigest appears to be available | ||
| 145 | // avoid getInstance() call here | ||
| 146 | if (Providers.getProviderList().getService | ||
| 147 | ("MessageDigest", oaepHashAlgorithm) == null) { | ||
| 148 | throw new NoSuchPaddingException | ||
| 149 | ("MessageDigest not available for " + paddingName); | ||
| 150 | } | ||
| 151 | } else { | ||
| 152 | throw new NoSuchPaddingException | ||
| 153 | ("Padding " + paddingName + " not supported"); | ||
| 154 | } | ||
| 155 | } | ||
| 156 | } | ||
| 157 | |||
| 158 | // return 0 as block size, we are not a block cipher | ||
| 159 | // see JCE spec | ||
| 160 | protected int engineGetBlockSize() { | ||
| 161 | return 0; | ||
| 162 | } | ||
| 163 | |||
| 164 | // return the output size | ||
| 165 | // see JCE spec | ||
| 166 | protected int engineGetOutputSize(int inputLen) { | ||
| 167 | return outputSize; | ||
| 168 | } | ||
| 169 | |||
| 170 | // no iv, return null | ||
| 171 | // see JCE spec | ||
| 172 | protected byte[] engineGetIV() { | ||
| 173 | return null; | ||
| 174 | } | ||
| 175 | |||
| 176 | // see JCE spec | ||
| 177 | protected AlgorithmParameters engineGetParameters() { | ||
| 178 | if (spec != null) { | ||
| 179 | try { | ||
| 180 | AlgorithmParameters params = | ||
| 181 | AlgorithmParameters.getInstance("OAEP", "SunJCE"); | ||
| 182 | params.init(spec); | ||
| 183 | return params; | ||
| 184 | } catch (NoSuchAlgorithmException nsae) { | ||
| 185 | // should never happen | ||
| 186 | throw new RuntimeException("Cannot find OAEP " + | ||
| 187 | " AlgorithmParameters implementation in SunJCE provider"); | ||
| 188 | } catch (NoSuchProviderException nspe) { | ||
| 189 | // should never happen | ||
| 190 | throw new RuntimeException("Cannot find SunJCE provider"); | ||
| 191 | } catch (InvalidParameterSpecException ipse) { | ||
| 192 | // should never happen | ||
| 193 | throw new RuntimeException("OAEPParameterSpec not supported"); | ||
| 194 | } | ||
| 195 | } else { | ||
| 196 | return null; | ||
| 197 | } | ||
| 198 | } | ||
| 199 | |||
| 200 | // see JCE spec | ||
| 201 | protected void engineInit(int opmode, Key key, SecureRandom random) | ||
| 202 | throws InvalidKeyException { | ||
| 203 | try { | ||
| 204 | init(opmode, key, random, null); | ||
| 205 | } catch (InvalidAlgorithmParameterException iape) { | ||
| 206 | // never thrown when null parameters are used; | ||
| 207 | // but re-throw it just in case | ||
| 208 | InvalidKeyException ike = | ||
| 209 | new InvalidKeyException("Wrong parameters"); | ||
| 210 | ike.initCause(iape); | ||
| 211 | throw ike; | ||
| 212 | } | ||
| 213 | } | ||
| 214 | |||
| 215 | // see JCE spec | ||
| 216 | protected void engineInit(int opmode, Key key, | ||
| 217 | AlgorithmParameterSpec params, SecureRandom random) | ||
| 218 | throws InvalidKeyException, InvalidAlgorithmParameterException { | ||
| 219 | init(opmode, key, random, params); | ||
| 220 | } | ||
| 221 | |||
| 222 | // see JCE spec | ||
| 223 | protected void engineInit(int opmode, Key key, | ||
| 224 | AlgorithmParameters params, SecureRandom random) | ||
| 225 | throws InvalidKeyException, InvalidAlgorithmParameterException { | ||
| 226 | if (params == null) { | ||
| 227 | init(opmode, key, random, null); | ||
| 228 | } else { | ||
| 229 | try { | ||
| 230 | OAEPParameterSpec spec = (OAEPParameterSpec) | ||
| 231 | params.getParameterSpec(OAEPParameterSpec.class); | ||
| 232 | init(opmode, key, random, spec); | ||
| 233 | } catch (InvalidParameterSpecException ipse) { | ||
| 234 | InvalidAlgorithmParameterException iape = | ||
| 235 | new InvalidAlgorithmParameterException("Wrong parameter"); | ||
| 236 | iape.initCause(ipse); | ||
| 237 | throw iape; | ||
| 238 | } | ||
| 239 | } | ||
| 240 | } | ||
| 241 | |||
| 242 | // initialize this cipher | ||
| 243 | private void init(int opmode, Key key, SecureRandom random, | ||
| 244 | AlgorithmParameterSpec params) | ||
| 245 | throws InvalidKeyException, InvalidAlgorithmParameterException { | ||
| 246 | boolean encrypt; | ||
| 247 | switch (opmode) { | ||
| 248 | case Cipher.ENCRYPT_MODE: | ||
| 249 | case Cipher.WRAP_MODE: | ||
| 250 | encrypt = true; | ||
| 251 | break; | ||
| 252 | case Cipher.DECRYPT_MODE: | ||
| 253 | case Cipher.UNWRAP_MODE: | ||
| 254 | encrypt = false; | ||
| 255 | break; | ||
| 256 | default: | ||
| 257 | throw new InvalidKeyException("Unknown mode: " + opmode); | ||
| 258 | } | ||
| 259 | RSAKey rsaKey = RSAKeyFactory.toRSAKey(key); | ||
| 260 | if (key instanceof RSAPublicKey) { | ||
| 261 | mode = encrypt ? MODE_ENCRYPT : MODE_VERIFY; | ||
| 262 | publicKey = (RSAPublicKey)key; | ||
| 263 | privateKey = null; | ||
| 264 | } else { // must be RSAPrivateKey per check in toRSAKey | ||
| 265 | mode = encrypt ? MODE_SIGN : MODE_DECRYPT; | ||
| 266 | privateKey = (RSAPrivateKey)key; | ||
| 267 | publicKey = null; | ||
| 268 | } | ||
| 269 | int n = RSACore.getByteLength(rsaKey.getModulus()); | ||
| 270 | outputSize = n; | ||
| 271 | bufOfs = 0; | ||
| 272 | if (paddingType == PAD_NONE) { | ||
| 273 | if (params != null) { | ||
| 274 | throw new InvalidAlgorithmParameterException | ||
| 275 | ("Parameters not supported"); | ||
| 276 | } | ||
| 277 | padding = RSAPadding.getInstance(RSAPadding.PAD_NONE, n, random); | ||
| 278 | buffer = new byte[n]; | ||
| 279 | } else if (paddingType == PAD_PKCS1) { | ||
| 280 | if (params != null) { | ||
| 281 | throw new InvalidAlgorithmParameterException | ||
| 282 | ("Parameters not supported"); | ||
| 283 | } | ||
| 284 | int blockType = (mode <= MODE_DECRYPT) ? RSAPadding.PAD_BLOCKTYPE_2 | ||
| 285 | : RSAPadding.PAD_BLOCKTYPE_1; | ||
| 286 | padding = RSAPadding.getInstance(blockType, n, random); | ||
| 287 | if (encrypt) { | ||
| 288 | int k = padding.getMaxDataSize(); | ||
| 289 | buffer = new byte[k]; | ||
| 290 | } else { | ||
| 291 | buffer = new byte[n]; | ||
| 292 | } | ||
| 293 | } else { // PAD_OAEP_MGF1 | ||
| 294 | if ((mode == MODE_SIGN) || (mode == MODE_VERIFY)) { | ||
| 295 | throw new InvalidKeyException | ||
| 296 | ("OAEP cannot be used to sign or verify signatures"); | ||
| 297 | } | ||
| 298 | OAEPParameterSpec myParams; | ||
| 299 | if (params != null) { | ||
| 300 | if (!(params instanceof OAEPParameterSpec)) { | ||
| 301 | throw new InvalidAlgorithmParameterException | ||
| 302 | ("Wrong Parameters for OAEP Padding"); | ||
| 303 | } | ||
| 304 | myParams = (OAEPParameterSpec) params; | ||
| 305 | } else { | ||
| 306 | myParams = new OAEPParameterSpec(oaepHashAlgorithm, "MGF1", | ||
| 307 | MGF1ParameterSpec.SHA1, PSource.PSpecified.DEFAULT); | ||
| 308 | } | ||
| 309 | padding = RSAPadding.getInstance(RSAPadding.PAD_OAEP_MGF1, n, | ||
| 310 | random, myParams); | ||
| 311 | if (encrypt) { | ||
| 312 | int k = padding.getMaxDataSize(); | ||
| 313 | buffer = new byte[k]; | ||
| 314 | } else { | ||
| 315 | buffer = new byte[n]; | ||
| 316 | } | ||
| 317 | } | ||
| 318 | } | ||
| 319 | |||
| 320 | // internal update method | ||
| 321 | private void update(byte[] in, int inOfs, int inLen) { | ||
| 322 | if ((inLen == 0) || (in == null)) { | ||
| 323 | return; | ||
| 324 | } | ||
| 325 | if (bufOfs + inLen > buffer.length) { | ||
| 326 | bufOfs = buffer.length + 1; | ||
| 327 | return; | ||
| 328 | } | ||
| 329 | System.arraycopy(in, inOfs, buffer, bufOfs, inLen); | ||
| 330 | bufOfs += inLen; | ||
| 331 | } | ||
| 332 | |||
| 333 | // internal doFinal() method. Here we perform the actual RSA operation | ||
| 334 | private byte[] doFinal() throws BadPaddingException, | ||
| 335 | IllegalBlockSizeException { | ||
| 336 | if (bufOfs > buffer.length) { | ||
| 337 | throw new IllegalBlockSizeException("Data must not be longer " | ||
| 338 | + "than " + buffer.length + " bytes"); | ||
| 339 | } | ||
| 340 | try { | ||
| 341 | byte[] data; | ||
| 342 | switch (mode) { | ||
| 343 | case MODE_SIGN: | ||
| 344 | data = padding.pad(buffer, 0, bufOfs); | ||
| 345 | return RSACore.rsa(data, privateKey); | ||
| 346 | case MODE_VERIFY: | ||
| 347 | byte[] verifyBuffer = RSACore.convert(buffer, 0, bufOfs); | ||
| 348 | data = RSACore.rsa(verifyBuffer, publicKey); | ||
| 349 | return padding.unpad(data); | ||
| 350 | case MODE_ENCRYPT: | ||
| 351 | data = padding.pad(buffer, 0, bufOfs); | ||
| 352 | return RSACore.rsa(data, publicKey); | ||
| 353 | case MODE_DECRYPT: | ||
| 354 | byte[] decryptBuffer = RSACore.convert(buffer, 0, bufOfs); | ||
| 355 | data = RSACore.rsa(decryptBuffer, privateKey); | ||
| 356 | return padding.unpad(data); | ||
| 357 | default: | ||
| 358 | throw new AssertionError("Internal error"); | ||
| 359 | } | ||
| 360 | } finally { | ||
| 361 | bufOfs = 0; | ||
| 362 | } | ||
| 363 | } | ||
| 364 | |||
| 365 | // see JCE spec | ||
| 366 | protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) { | ||
| 367 | update(in, inOfs, inLen); | ||
| 368 | return B0; | ||
| 369 | } | ||
| 370 | |||
| 371 | // see JCE spec | ||
| 372 | protected int engineUpdate(byte[] in, int inOfs, int inLen, byte[] out, | ||
| 373 | int outOfs) { | ||
| 374 | update(in, inOfs, inLen); | ||
| 375 | return 0; | ||
| 376 | } | ||
| 377 | |||
| 378 | // see JCE spec | ||
| 379 | protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen) | ||
| 380 | throws BadPaddingException, IllegalBlockSizeException { | ||
| 381 | update(in, inOfs, inLen); | ||
| 382 | return doFinal(); | ||
| 383 | } | ||
| 384 | |||
| 385 | // see JCE spec | ||
| 386 | protected int engineDoFinal(byte[] in, int inOfs, int inLen, byte[] out, | ||
| 387 | int outOfs) throws ShortBufferException, BadPaddingException, | ||
| 388 | IllegalBlockSizeException { | ||
| 389 | if (outputSize > out.length - outOfs) { | ||
| 390 | throw new ShortBufferException | ||
| 391 | ("Need " + outputSize + " bytes for output"); | ||
| 392 | } | ||
| 393 | update(in, inOfs, inLen); | ||
| 394 | byte[] result = doFinal(); | ||
| 395 | int n = result.length; | ||
| 396 | System.arraycopy(result, 0, out, outOfs, n); | ||
| 397 | return n; | ||
| 398 | } | ||
| 399 | |||
| 400 | // see JCE spec | ||
| 401 | protected byte[] engineWrap(Key key) throws InvalidKeyException, | ||
| 402 | IllegalBlockSizeException { | ||
| 403 | byte[] encoded = key.getEncoded(); | ||
| 404 | if ((encoded == null) || (encoded.length == 0)) { | ||
| 405 | throw new InvalidKeyException("Could not obtain encoded key"); | ||
| 406 | } | ||
| 407 | if (encoded.length > buffer.length) { | ||
| 408 | throw new InvalidKeyException("Key is too long for wrapping"); | ||
| 409 | } | ||
| 410 | update(encoded, 0, encoded.length); | ||
| 411 | try { | ||
| 412 | return doFinal(); | ||
| 413 | } catch (BadPaddingException e) { | ||
| 414 | // should not occur | ||
| 415 | throw new InvalidKeyException("Wrapping failed", e); | ||
| 416 | } | ||
| 417 | } | ||
| 418 | |||
| 419 | // see JCE spec | ||
| 420 | protected Key engineUnwrap(byte[] wrappedKey, String algorithm, | ||
| 421 | int type) throws InvalidKeyException, NoSuchAlgorithmException { | ||
| 422 | if (wrappedKey.length > buffer.length) { | ||
| 423 | throw new InvalidKeyException("Key is too long for unwrapping"); | ||
| 424 | } | ||
| 425 | update(wrappedKey, 0, wrappedKey.length); | ||
| 426 | try { | ||
| 427 | byte[] encoded = doFinal(); | ||
| 428 | return ConstructKeys.constructKey(encoded, algorithm, type); | ||
| 429 | } catch (BadPaddingException e) { | ||
| 430 | // should not occur | ||
| 431 | throw new InvalidKeyException("Unwrapping failed", e); | ||
| 432 | } catch (IllegalBlockSizeException e) { | ||
| 433 | // should not occur, handled with length check above | ||
| 434 | throw new InvalidKeyException("Unwrapping failed", e); | ||
| 435 | } | ||
| 436 | } | ||
| 437 | |||
| 438 | // see JCE spec | ||
| 439 | protected int engineGetKeySize(Key key) throws InvalidKeyException { | ||
| 440 | RSAKey rsaKey = RSAKeyFactory.toRSAKey(key); | ||
| 441 | return rsaKey.getModulus().bitLength(); | ||
| 442 | } | ||
| 443 | |||
| 444 | } | ||