author | wetmore |
Mon, 03 Aug 2009 18:06:51 -0700 | |
changeset 3353 | ddbd63234844 |
parent 2 | 90ce3da70b43 |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
2 | 1 |
/* |
3353
ddbd63234844
6647452: Remove obfuscation, framework and provider self-verification checking
wetmore
parents:
2
diff
changeset
|
2 |
* Copyright 2003-2009 Sun Microsystems, Inc. All Rights Reserved. |
2 | 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 |
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 |
} |