1 /*
2 * Copyright (c) 2003, 2016, 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 sun.security.pkcs11;
27
28 import java.io.IOException;
29 import java.math.BigInteger;
30 import java.nio.ByteBuffer;
31
32 import java.security.*;
33 import java.security.interfaces.*;
34 import sun.nio.ch.DirectBuffer;
35
36 import sun.security.util.*;
37 import sun.security.x509.AlgorithmId;
38
39 import sun.security.rsa.RSASignature;
40 import sun.security.rsa.RSAPadding;
41
42 import sun.security.pkcs11.wrapper.*;
43 import static sun.security.pkcs11.wrapper.PKCS11Constants.*;
44 import sun.security.util.KeyUtil;
45
46 /**
47 * Signature implementation class. This class currently supports the
48 * following algorithms:
49 *
50 * . DSA
51 * . NONEwithDSA (RawDSA)
52 * . SHA1withDSA
53 * . NONEwithDSAinP1363Format (RawDSAinP1363Format)
54 * . SHA1withDSAinP1363Format
55 * . RSA:
56 * . MD2withRSA
57 * . MD5withRSA
58 * . SHA1withRSA
59 * . SHA224withRSA
60 * . SHA256withRSA
61 * . SHA384withRSA
62 * . SHA512withRSA
63 * . ECDSA
64 * . NONEwithECDSA
65 * . SHA1withECDSA
66 * . SHA224withECDSA
67 * . SHA256withECDSA
68 * . SHA384withECDSA
69 * . SHA512withECDSA
70 * . NONEwithECDSAinP1363Format
71 * . SHA1withECDSAinP1363Format
72 * . SHA224withECDSAinP1363Format
73 * . SHA256withECDSAinP1363Format
74 * . SHA384withECDSAinP1363Format
75 * . SHA512withECDSAinP1363Format
76 *
77 * Note that the underlying PKCS#11 token may support complete signature
78 * algorithm (e.g. CKM_DSA_SHA1, CKM_MD5_RSA_PKCS), or it may just
79 * implement the signature algorithm without hashing (e.g. CKM_DSA, CKM_PKCS),
80 * or it may only implement the raw public key operation (CKM_RSA_X_509).
81 * This class uses what is available and adds whatever extra processing
82 * is needed.
83 *
84 * @author Andreas Sterbenz
85 * @since 1.5
86 */
87 final class P11Signature extends SignatureSpi {
88
89 // token instance
90 private final Token token;
91
92 // algorithm name
93 private final String algorithm;
94
95 // name of the key algorithm, currently either RSA or DSA
96 private final String keyAlgorithm;
97
98 // mechanism id
99 private final long mechanism;
100
101 // digest algorithm OID, if we encode RSA signature ourselves
102 private final ObjectIdentifier digestOID;
103
104 // type, one of T_* below
105 private final int type;
106
107 // key instance used, if init*() was called
108 private P11Key p11Key;
109
110 // message digest, if we do the digesting ourselves
111 private final MessageDigest md;
112
113 // associated session, if any
114 private Session session;
115
116 // mode, one of M_* below
117 private int mode;
118
119 // flag indicating whether an operation is initialized
120 private boolean initialized;
121
122 // buffer, for update(byte) or DSA
123 private final byte[] buffer;
124
125 // total number of bytes processed in current operation
126 private int bytesProcessed;
127
128 // The format, to be used for DSA and ECDSA signatures.
129 // If true, the IEEE P1363 format will be used, the concatenation of
130 // r and s. If false (default), the signature will be formatted as a
131 // DER-encoded ASN.1 sequence of r and s.
132 private boolean p1363Format = false;
133
134 // constant for signing mode
135 private final static int M_SIGN = 1;
136 // constant for verification mode
137 private final static int M_VERIFY = 2;
138
139 // constant for type digesting, we do the hashing ourselves
140 private final static int T_DIGEST = 1;
141 // constant for type update, token does everything
142 private final static int T_UPDATE = 2;
143 // constant for type raw, used with RawDSA and NONEwithECDSA only
144 private final static int T_RAW = 3;
145
146 // XXX PKCS#11 v2.20 says "should not be longer than 1024 bits",
147 // but this is a little arbitrary
148 private final static int RAW_ECDSA_MAX = 128;
149
150 P11Signature(Token token, String algorithm, long mechanism)
151 throws NoSuchAlgorithmException, PKCS11Exception {
152 super();
153 this.token = token;
154 this.algorithm = algorithm;
155 this.mechanism = mechanism;
156 byte[] buffer = null;
157 ObjectIdentifier digestOID = null;
158 MessageDigest md = null;
159 switch ((int)mechanism) {
160 case (int)CKM_MD2_RSA_PKCS:
161 case (int)CKM_MD5_RSA_PKCS:
162 case (int)CKM_SHA1_RSA_PKCS:
163 case (int)CKM_SHA224_RSA_PKCS:
164 case (int)CKM_SHA256_RSA_PKCS:
165 case (int)CKM_SHA384_RSA_PKCS:
166 case (int)CKM_SHA512_RSA_PKCS:
167 keyAlgorithm = "RSA";
168 type = T_UPDATE;
169 buffer = new byte[1];
170 break;
171 case (int)CKM_DSA_SHA1:
172 keyAlgorithm = "DSA";
173 type = T_UPDATE;
174 buffer = new byte[1];
175 break;
176 case (int)CKM_ECDSA_SHA1:
177 keyAlgorithm = "EC";
178 type = T_UPDATE;
179 buffer = new byte[1];
180 break;
181 case (int)CKM_DSA:
182 keyAlgorithm = "DSA";
183 if (algorithm.equals("DSA") ||
184 algorithm.equals("DSAinP1363Format")) {
185 type = T_DIGEST;
186 md = MessageDigest.getInstance("SHA-1");
187 } else if (algorithm.equals("RawDSA") ||
188 algorithm.equals("RawDSAinP1363Format")) {
189 type = T_RAW;
190 buffer = new byte[20];
191 } else {
192 throw new ProviderException(algorithm);
193 }
194 break;
195 case (int)CKM_ECDSA:
196 keyAlgorithm = "EC";
197 if (algorithm.equals("NONEwithECDSA") ||
198 algorithm.equals("NONEwithECDSAinP1363Format")) {
199 type = T_RAW;
200 buffer = new byte[RAW_ECDSA_MAX];
201 } else {
202 String digestAlg;
203 if (algorithm.equals("SHA1withECDSA") ||
204 algorithm.equals("SHA1withECDSAinP1363Format")) {
205 digestAlg = "SHA-1";
206 } else if (algorithm.equals("SHA224withECDSA") ||
207 algorithm.equals("SHA224withECDSAinP1363Format")) {
208 digestAlg = "SHA-224";
209 } else if (algorithm.equals("SHA256withECDSA") ||
210 algorithm.equals("SHA256withECDSAinP1363Format")) {
211 digestAlg = "SHA-256";
212 } else if (algorithm.equals("SHA384withECDSA") ||
213 algorithm.equals("SHA384withECDSAinP1363Format")) {
214 digestAlg = "SHA-384";
215 } else if (algorithm.equals("SHA512withECDSA") ||
216 algorithm.equals("SHA512withECDSAinP1363Format")) {
217 digestAlg = "SHA-512";
218 } else {
219 throw new ProviderException(algorithm);
220 }
221 type = T_DIGEST;
222 md = MessageDigest.getInstance(digestAlg);
223 }
224 break;
225 case (int)CKM_RSA_PKCS:
226 case (int)CKM_RSA_X_509:
227 keyAlgorithm = "RSA";
228 type = T_DIGEST;
229 if (algorithm.equals("MD5withRSA")) {
230 md = MessageDigest.getInstance("MD5");
231 digestOID = AlgorithmId.MD5_oid;
232 } else if (algorithm.equals("SHA1withRSA")) {
233 md = MessageDigest.getInstance("SHA-1");
234 digestOID = AlgorithmId.SHA_oid;
235 } else if (algorithm.equals("MD2withRSA")) {
236 md = MessageDigest.getInstance("MD2");
237 digestOID = AlgorithmId.MD2_oid;
238 } else if (algorithm.equals("SHA224withRSA")) {
239 md = MessageDigest.getInstance("SHA-224");
240 digestOID = AlgorithmId.SHA224_oid;
241 } else if (algorithm.equals("SHA256withRSA")) {
242 md = MessageDigest.getInstance("SHA-256");
243 digestOID = AlgorithmId.SHA256_oid;
244 } else if (algorithm.equals("SHA384withRSA")) {
245 md = MessageDigest.getInstance("SHA-384");
246 digestOID = AlgorithmId.SHA384_oid;
247 } else if (algorithm.equals("SHA512withRSA")) {
248 md = MessageDigest.getInstance("SHA-512");
249 digestOID = AlgorithmId.SHA512_oid;
250 } else {
251 throw new ProviderException("Unknown signature: " + algorithm);
252 }
253 break;
254 default:
255 throw new ProviderException("Unknown mechanism: " + mechanism);
256 }
257 this.buffer = buffer;
258 this.digestOID = digestOID;
259 this.md = md;
260 if (algorithm.endsWith("inP1363Format")) {
261 this.p1363Format = true;
262 }
263 }
264
265 private void ensureInitialized() {
266 token.ensureValid();
267 if (initialized == false) {
268 initialize();
269 }
270 }
271
272 private void cancelOperation() {
273 token.ensureValid();
274 if (initialized == false) {
275 return;
276 }
277 initialized = false;
278 if ((session == null) || (token.explicitCancel == false)) {
279 return;
280 }
281 if (session.hasObjects() == false) {
282 session = token.killSession(session);
283 return;
284 }
285 // "cancel" operation by finishing it
286 // XXX make sure all this always works correctly
287 if (mode == M_SIGN) {
288 try {
289 if (type == T_UPDATE) {
290 token.p11.C_SignFinal(session.id(), 0);
291 } else {
292 byte[] digest;
293 if (type == T_DIGEST) {
294 digest = md.digest();
295 } else { // T_RAW
296 digest = buffer;
297 }
298 token.p11.C_Sign(session.id(), digest);
299 }
300 } catch (PKCS11Exception e) {
301 throw new ProviderException("cancel failed", e);
302 }
303 } else { // M_VERIFY
304 try {
305 byte[] signature;
306 if (keyAlgorithm.equals("DSA")) {
307 signature = new byte[40];
308 } else {
309 signature = new byte[(p11Key.length() + 7) >> 3];
310 }
311 if (type == T_UPDATE) {
312 token.p11.C_VerifyFinal(session.id(), signature);
313 } else {
314 byte[] digest;
315 if (type == T_DIGEST) {
316 digest = md.digest();
317 } else { // T_RAW
318 digest = buffer;
319 }
320 token.p11.C_Verify(session.id(), digest, signature);
321 }
322 } catch (PKCS11Exception e) {
323 // will fail since the signature is incorrect
324 // XXX check error code
325 }
326 }
327 }
328
329 // assumes current state is initialized == false
330 private void initialize() {
331 try {
332 if (session == null) {
333 session = token.getOpSession();
334 }
335 if (mode == M_SIGN) {
336 token.p11.C_SignInit(session.id(),
337 new CK_MECHANISM(mechanism), p11Key.keyID);
338 } else {
339 token.p11.C_VerifyInit(session.id(),
340 new CK_MECHANISM(mechanism), p11Key.keyID);
341 }
342 initialized = true;
343 } catch (PKCS11Exception e) {
344 throw new ProviderException("Initialization failed", e);
345 }
346 if (bytesProcessed != 0) {
347 bytesProcessed = 0;
348 if (md != null) {
349 md.reset();
350 }
351 }
352 }
353
354 private void checkKeySize(String keyAlgo, Key key)
355 throws InvalidKeyException {
356 CK_MECHANISM_INFO mechInfo = null;
357 try {
358 mechInfo = token.getMechanismInfo(mechanism);
359 } catch (PKCS11Exception e) {
360 // should not happen, ignore for now.
361 }
362 if (mechInfo == null) {
363 // skip the check if no native info available
364 return;
365 }
366 int minKeySize = (int) mechInfo.ulMinKeySize;
367 int maxKeySize = (int) mechInfo.ulMaxKeySize;
368 // need to override the MAX keysize for SHA1withDSA
369 if (md != null && mechanism == CKM_DSA && maxKeySize > 1024) {
370 maxKeySize = 1024;
371 }
372 int keySize = 0;
373 if (key instanceof P11Key) {
374 keySize = ((P11Key) key).length();
375 } else {
376 if (keyAlgo.equals("RSA")) {
377 keySize = ((RSAKey) key).getModulus().bitLength();
378 } else if (keyAlgo.equals("DSA")) {
379 keySize = ((DSAKey) key).getParams().getP().bitLength();
380 } else if (keyAlgo.equals("EC")) {
381 keySize = ((ECKey) key).getParams().getCurve().getField().getFieldSize();
382 } else {
383 throw new ProviderException("Error: unsupported algo " + keyAlgo);
384 }
385 }
386 if ((minKeySize != -1) && (keySize < minKeySize)) {
387 throw new InvalidKeyException(keyAlgo +
388 " key must be at least " + minKeySize + " bits");
389 }
390 if ((maxKeySize != -1) && (keySize > maxKeySize)) {
391 throw new InvalidKeyException(keyAlgo +
392 " key must be at most " + maxKeySize + " bits");
393 }
394 if (keyAlgo.equals("RSA")) {
395 checkRSAKeyLength(keySize);
396 }
397 }
398
399 private void checkRSAKeyLength(int len) throws InvalidKeyException {
400 RSAPadding padding;
401 try {
402 padding = RSAPadding.getInstance
403 (RSAPadding.PAD_BLOCKTYPE_1, (len + 7) >> 3);
404 } catch (InvalidAlgorithmParameterException iape) {
405 throw new InvalidKeyException(iape.getMessage());
406 }
407 int maxDataSize = padding.getMaxDataSize();
408 int encodedLength;
409 if (algorithm.equals("MD5withRSA") ||
410 algorithm.equals("MD2withRSA")) {
411 encodedLength = 34;
412 } else if (algorithm.equals("SHA1withRSA")) {
413 encodedLength = 35;
414 } else if (algorithm.equals("SHA224withRSA")) {
415 encodedLength = 47;
416 } else if (algorithm.equals("SHA256withRSA")) {
417 encodedLength = 51;
418 } else if (algorithm.equals("SHA384withRSA")) {
419 encodedLength = 67;
420 } else if (algorithm.equals("SHA512withRSA")) {
421 encodedLength = 83;
422 } else {
423 throw new ProviderException("Unknown signature algo: " + algorithm);
424 }
425 if (encodedLength > maxDataSize) {
426 throw new InvalidKeyException
427 ("Key is too short for this signature algorithm");
428 }
429 }
430
431 // see JCA spec
432 protected void engineInitVerify(PublicKey publicKey)
433 throws InvalidKeyException {
434 if (publicKey == null) {
435 throw new InvalidKeyException("Key must not be null");
436 }
437 // Need to check key length whenever a new key is set
438 if (publicKey != p11Key) {
439 checkKeySize(keyAlgorithm, publicKey);
440 }
441 cancelOperation();
442 mode = M_VERIFY;
443 p11Key = P11KeyFactory.convertKey(token, publicKey, keyAlgorithm);
444 initialize();
445 }
446
447 // see JCA spec
448 protected void engineInitSign(PrivateKey privateKey)
449 throws InvalidKeyException {
450 if (privateKey == null) {
451 throw new InvalidKeyException("Key must not be null");
452 }
453 // Need to check RSA key length whenever a new key is set
454 if (privateKey != p11Key) {
455 checkKeySize(keyAlgorithm, privateKey);
456 }
457 cancelOperation();
458 mode = M_SIGN;
459 p11Key = P11KeyFactory.convertKey(token, privateKey, keyAlgorithm);
460 initialize();
461 }
462
463 // see JCA spec
464 protected void engineUpdate(byte b) throws SignatureException {
465 ensureInitialized();
466 switch (type) {
467 case T_UPDATE:
468 buffer[0] = b;
469 engineUpdate(buffer, 0, 1);
470 break;
471 case T_DIGEST:
472 md.update(b);
473 bytesProcessed++;
474 break;
475 case T_RAW:
476 if (bytesProcessed >= buffer.length) {
477 bytesProcessed = buffer.length + 1;
478 return;
479 }
480 buffer[bytesProcessed++] = b;
481 break;
482 default:
483 throw new ProviderException("Internal error");
484 }
485 }
486
487 // see JCA spec
488 protected void engineUpdate(byte[] b, int ofs, int len)
489 throws SignatureException {
490 ensureInitialized();
491 if (len == 0) {
492 return;
493 }
494 switch (type) {
495 case T_UPDATE:
496 try {
497 if (mode == M_SIGN) {
498 token.p11.C_SignUpdate(session.id(), 0, b, ofs, len);
499 } else {
500 token.p11.C_VerifyUpdate(session.id(), 0, b, ofs, len);
501 }
502 bytesProcessed += len;
503 } catch (PKCS11Exception e) {
504 throw new ProviderException(e);
505 }
506 break;
507 case T_DIGEST:
508 md.update(b, ofs, len);
509 bytesProcessed += len;
510 break;
511 case T_RAW:
512 if (bytesProcessed + len > buffer.length) {
513 bytesProcessed = buffer.length + 1;
514 return;
515 }
516 System.arraycopy(b, ofs, buffer, bytesProcessed, len);
517 bytesProcessed += len;
518 break;
519 default:
520 throw new ProviderException("Internal error");
521 }
522 }
523
524 // see JCA spec
525 protected void engineUpdate(ByteBuffer byteBuffer) {
526 ensureInitialized();
527 int len = byteBuffer.remaining();
528 if (len <= 0) {
529 return;
530 }
531 switch (type) {
532 case T_UPDATE:
533 if (byteBuffer instanceof DirectBuffer == false) {
534 // cannot do better than default impl
535 super.engineUpdate(byteBuffer);
536 return;
537 }
538 long addr = ((DirectBuffer)byteBuffer).address();
539 int ofs = byteBuffer.position();
540 try {
541 if (mode == M_SIGN) {
542 token.p11.C_SignUpdate
543 (session.id(), addr + ofs, null, 0, len);
544 } else {
545 token.p11.C_VerifyUpdate
546 (session.id(), addr + ofs, null, 0, len);
547 }
548 bytesProcessed += len;
549 byteBuffer.position(ofs + len);
550 } catch (PKCS11Exception e) {
551 throw new ProviderException("Update failed", e);
552 }
553 break;
554 case T_DIGEST:
555 md.update(byteBuffer);
556 bytesProcessed += len;
557 break;
558 case T_RAW:
559 if (bytesProcessed + len > buffer.length) {
560 bytesProcessed = buffer.length + 1;
561 return;
562 }
563 byteBuffer.get(buffer, bytesProcessed, len);
564 bytesProcessed += len;
565 break;
566 default:
567 throw new ProviderException("Internal error");
568 }
569 }
570
571 // see JCA spec
572 protected byte[] engineSign() throws SignatureException {
573 ensureInitialized();
574 try {
575 byte[] signature;
576 if (type == T_UPDATE) {
577 int len = keyAlgorithm.equals("DSA") ? 40 : 0;
578 signature = token.p11.C_SignFinal(session.id(), len);
579 } else {
580 byte[] digest;
581 if (type == T_DIGEST) {
582 digest = md.digest();
583 } else { // T_RAW
584 if (mechanism == CKM_DSA) {
585 if (bytesProcessed != buffer.length) {
586 throw new SignatureException
587 ("Data for RawDSA must be exactly 20 bytes long");
588 }
589 digest = buffer;
590 } else { // CKM_ECDSA
591 if (bytesProcessed > buffer.length) {
592 throw new SignatureException("Data for NONEwithECDSA"
593 + " must be at most " + RAW_ECDSA_MAX + " bytes long");
594 }
595 digest = new byte[bytesProcessed];
596 System.arraycopy(buffer, 0, digest, 0, bytesProcessed);
597 }
598 }
599 if (keyAlgorithm.equals("RSA") == false) {
600 // DSA and ECDSA
601 signature = token.p11.C_Sign(session.id(), digest);
602 } else { // RSA
603 byte[] data = encodeSignature(digest);
604 if (mechanism == CKM_RSA_X_509) {
605 data = pkcs1Pad(data);
606 }
607 signature = token.p11.C_Sign(session.id(), data);
608 }
609 }
610 if (keyAlgorithm.equals("RSA")) {
611 return signature;
612 } else {
613 if (p1363Format) {
614 return signature;
615 } else {
616 return dsaToASN1(signature);
617 }
618 }
619 } catch (PKCS11Exception pe) {
620 throw new ProviderException(pe);
621 } catch (SignatureException | ProviderException e) {
622 cancelOperation();
623 throw e;
624 } finally {
625 initialized = false;
626 session = token.releaseSession(session);
627 }
628 }
629
630 // see JCA spec
631 protected boolean engineVerify(byte[] signature) throws SignatureException {
632 ensureInitialized();
633 try {
634 if (!p1363Format) {
635 if (keyAlgorithm.equals("DSA")) {
636 signature = asn1ToDSA(signature);
637 } else if (keyAlgorithm.equals("EC")) {
638 signature = asn1ToECDSA(signature);
639 }
640 }
641 if (type == T_UPDATE) {
642 token.p11.C_VerifyFinal(session.id(), signature);
643 } else {
644 byte[] digest;
645 if (type == T_DIGEST) {
646 digest = md.digest();
647 } else { // T_RAW
648 if (mechanism == CKM_DSA) {
649 if (bytesProcessed != buffer.length) {
650 throw new SignatureException
651 ("Data for RawDSA must be exactly 20 bytes long");
652 }
653 digest = buffer;
654 } else {
655 if (bytesProcessed > buffer.length) {
656 throw new SignatureException("Data for NONEwithECDSA"
657 + " must be at most " + RAW_ECDSA_MAX + " bytes long");
658 }
659 digest = new byte[bytesProcessed];
660 System.arraycopy(buffer, 0, digest, 0, bytesProcessed);
661 }
662 }
663 if (keyAlgorithm.equals("RSA") == false) {
664 // DSA and ECDSA
665 token.p11.C_Verify(session.id(), digest, signature);
666 } else { // RSA
667 byte[] data = encodeSignature(digest);
668 if (mechanism == CKM_RSA_X_509) {
669 data = pkcs1Pad(data);
670 }
671 token.p11.C_Verify(session.id(), data, signature);
672 }
673 }
674 return true;
675 } catch (PKCS11Exception pe) {
676 long errorCode = pe.getErrorCode();
677 if (errorCode == CKR_SIGNATURE_INVALID) {
678 return false;
679 }
680 if (errorCode == CKR_SIGNATURE_LEN_RANGE) {
681 // return false rather than throwing an exception
682 return false;
683 }
684 // ECF bug?
685 if (errorCode == CKR_DATA_LEN_RANGE) {
686 return false;
687 }
688 throw new ProviderException(pe);
689 } catch (SignatureException | ProviderException e) {
690 cancelOperation();
691 throw e;
692 } finally {
693 initialized = false;
694 session = token.releaseSession(session);
695 }
696 }
697
698 private byte[] pkcs1Pad(byte[] data) {
699 try {
700 int len = (p11Key.length() + 7) >> 3;
701 RSAPadding padding = RSAPadding.getInstance
702 (RSAPadding.PAD_BLOCKTYPE_1, len);
703 byte[] padded = padding.pad(data);
704 return padded;
705 } catch (GeneralSecurityException e) {
706 throw new ProviderException(e);
707 }
708 }
709
710 private byte[] encodeSignature(byte[] digest) throws SignatureException {
711 try {
712 return RSASignature.encodeSignature(digestOID, digest);
713 } catch (IOException e) {
714 throw new SignatureException("Invalid encoding", e);
715 }
716 }
717
718 // private static byte[] decodeSignature(byte[] signature) throws IOException {
719 // return RSASignature.decodeSignature(digestOID, signature);
720 // }
721
722 // For DSA and ECDSA signatures, PKCS#11 represents them as a simple
723 // byte array that contains the concatenation of r and s.
724 // For DSA, r and s are always exactly 20 bytes long.
725 // For ECDSA, r and s are of variable length, but we know that each
726 // occupies half of the array.
727 private static byte[] dsaToASN1(byte[] signature) {
728 int n = signature.length >> 1;
729 BigInteger r = new BigInteger(1, P11Util.subarray(signature, 0, n));
730 BigInteger s = new BigInteger(1, P11Util.subarray(signature, n, n));
731 try {
732 DerOutputStream outseq = new DerOutputStream(100);
733 outseq.putInteger(r);
734 outseq.putInteger(s);
735 DerValue result = new DerValue(DerValue.tag_Sequence,
736 outseq.toByteArray());
737 return result.toByteArray();
738 } catch (java.io.IOException e) {
739 throw new RuntimeException("Internal error", e);
740 }
741 }
742
743 private static byte[] asn1ToDSA(byte[] signature) throws SignatureException {
744 try {
745 DerInputStream in = new DerInputStream(signature);
746 DerValue[] values = in.getSequence(2);
747 BigInteger r = values[0].getPositiveBigInteger();
748 BigInteger s = values[1].getPositiveBigInteger();
749
750 // Check for trailing signature data
751 if (in.available() != 0) {
752 throw new IOException("Incorrect signature length");
753 }
754 byte[] br = toByteArray(r, 20);
755 byte[] bs = toByteArray(s, 20);
756 if ((br == null) || (bs == null)) {
757 throw new SignatureException("Out of range value for R or S");
758 }
759 return P11Util.concat(br, bs);
760 } catch (SignatureException e) {
761 throw e;
762 } catch (Exception e) {
763 throw new SignatureException("invalid encoding for signature", e);
764 }
765 }
766
767 private byte[] asn1ToECDSA(byte[] signature) throws SignatureException {
768 try {
769 DerInputStream in = new DerInputStream(signature);
770 DerValue[] values = in.getSequence(2);
771 BigInteger r = values[0].getPositiveBigInteger();
772 BigInteger s = values[1].getPositiveBigInteger();
773
774 // Check for trailing signature data
775 if (in.available() != 0) {
776 throw new IOException("Incorrect signature length");
777 }
778 // trim leading zeroes
779 byte[] br = KeyUtil.trimZeroes(r.toByteArray());
780 byte[] bs = KeyUtil.trimZeroes(s.toByteArray());
781 int k = Math.max(br.length, bs.length);
782 // r and s each occupy half the array
783 byte[] res = new byte[k << 1];
784 System.arraycopy(br, 0, res, k - br.length, br.length);
785 System.arraycopy(bs, 0, res, res.length - bs.length, bs.length);
786 return res;
787 } catch (Exception e) {
788 throw new SignatureException("invalid encoding for signature", e);
789 }
790 }
791
792 private static byte[] toByteArray(BigInteger bi, int len) {
793 byte[] b = bi.toByteArray();
794 int n = b.length;
795 if (n == len) {
796 return b;
797 }
798 if ((n == len + 1) && (b[0] == 0)) {
799 byte[] t = new byte[len];
800 System.arraycopy(b, 1, t, 0, len);
801 return t;
802 }
803 if (n > len) {
804 return null;
805 }
806 // must be smaller
807 byte[] t = new byte[len];
808 System.arraycopy(b, 0, t, (len - n), n);
809 return t;
810 }
811
812 // see JCA spec
813 @SuppressWarnings("deprecation")
814 protected void engineSetParameter(String param, Object value)
815 throws InvalidParameterException {
816 throw new UnsupportedOperationException("setParameter() not supported");
817 }
818
819 // see JCA spec
820 @SuppressWarnings("deprecation")
821 protected Object engineGetParameter(String param)
822 throws InvalidParameterException {
823 throw new UnsupportedOperationException("getParameter() not supported");
824 }
825 }