-
Notifications
You must be signed in to change notification settings - Fork 149
/
XrdCryptosslCipher.cc
1131 lines (1050 loc) · 32.8 KB
/
XrdCryptosslCipher.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/******************************************************************************/
/* */
/* X r d C r y p t o S s l C i p h e r . c c */
/* */
/* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
/* Produced by Gerri Ganis for CERN */
/* */
/* This file is part of the XRootD software suite. */
/* */
/* XRootD is free software: you can redistribute it and/or modify it under */
/* the terms of the GNU Lesser General Public License as published by the */
/* Free Software Foundation, either version 3 of the License, or (at your */
/* option) any later version. */
/* */
/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
/* License for more details. */
/* */
/* You should have received a copy of the GNU Lesser General Public License */
/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
/* */
/* The copyright holder's institutional names and contributor's names may not */
/* be used to endorse or promote products derived from this software without */
/* specific prior written permission of the institution or contributor. */
/******************************************************************************/
/* ************************************************************************** */
/* */
/* OpenSSL implementation of XrdCryptoCipher */
/* */
/* ************************************************************************** */
#include <string.h>
#include "XrdSut/XrdSutRndm.hh"
#include "XrdCrypto/XrdCryptosslTrace.hh"
#include "XrdCrypto/XrdCryptosslCipher.hh"
//#include <openssl/dsa.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/dh.h>
// ---------------------------------------------------------------------------//
//
// Cipher interface
//
// ---------------------------------------------------------------------------//
#if OPENSSL_VERSION_NUMBER < 0x10100000L
static void DH_get0_pqg(const DH *dh,
const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
if (p != NULL)
*p = dh->p;
if (q != NULL)
*q = dh->q;
if (g != NULL)
*g = dh->g;
}
static int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
/* If the fields p and g in d are NULL, the corresponding input
* parameters MUST be non-NULL. q may remain NULL.
*/
if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL))
return 0;
if (p != NULL) {
BN_free(dh->p);
dh->p = p;
}
if (q != NULL) {
BN_free(dh->q);
dh->q = q;
}
if (g != NULL) {
BN_free(dh->g);
dh->g = g;
}
if (q != NULL) {
dh->length = BN_num_bits(q);
}
return 1;
}
static void DH_get0_key(const DH *dh,
const BIGNUM **pub_key, const BIGNUM **priv_key)
{
if (pub_key != NULL)
*pub_key = dh->pub_key;
if (priv_key != NULL)
*priv_key = dh->priv_key;
}
static int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
{
/* If the field pub_key in dh is NULL, the corresponding input
* parameters MUST be non-NULL. The priv_key field may
* be left NULL.
*/
if (dh->pub_key == NULL && pub_key == NULL)
return 0;
if (pub_key != NULL) {
BN_free(dh->pub_key);
dh->pub_key = pub_key;
}
if (priv_key != NULL) {
BN_free(dh->priv_key);
dh->priv_key = priv_key;
}
return 1;
}
static int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
{
/* If the field pub_key in d is NULL, the corresponding input
* parameters MUST be non-NULL. The priv_key field may
* be left NULL.
*/
if (d->pub_key == NULL && pub_key == NULL)
return 0;
if (pub_key != NULL) {
BN_free(d->pub_key);
d->pub_key = pub_key;
}
if (priv_key != NULL) {
BN_free(d->priv_key);
d->priv_key = priv_key;
}
return 1;
}
#endif
#if !defined(HAVE_DH_PADDED)
#if defined(HAVE_DH_PADDED_FUNC)
int DH_compute_key_padded(unsigned char *, const BIGNUM *, DH *);
#else
static int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
{
int rv, pad;
rv = dh->meth->compute_key(key, pub_key, dh);
if (rv <= 0)
return rv;
pad = BN_num_bytes(dh->p) - rv;
if (pad > 0) {
memmove(key + pad, key, rv);
memset(key, 0, pad);
}
return rv + pad;
}
#endif
#endif
//_____________________________________________________________________________
bool XrdCryptosslCipher::IsSupported(const char *cip)
{
// Check if the specified cipher is supported
return (EVP_get_cipherbyname(cip) != 0);
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const char *t, int l)
{
// Main Constructor
// Complete initialization of a cipher of type t and length l
// The initialization vector is also created
// Used to create ciphers
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
cipher = 0;
fDH = 0;
deflength = 1;
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
cipher = EVP_get_cipherbyname(cipnam);
if (cipher) {
// Determine key length
l = (l > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : l;
int ldef = EVP_CIPHER_key_length(cipher);
int lgen = (l > ldef) ? l : ldef;
// Generate and set a new key
char *ktmp = XrdSutRndm::GetBuffer(lgen);
if (ktmp) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
valid = 1;
// Try setting the key length
if (l && l != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,l);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if (l == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the l bytes at ktmp
SetBuffer(l,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
// Cleanup
delete[] ktmp;
}
}
// Finally, generate and set a new IV
if (valid)
GenerateIV();
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const char *t, int l,
const char *k, int liv, const char *iv)
{
// Constructor.
// Initialize a cipher of type t and length l using the key at k and
// the initialization vector at iv.
// Used to import ciphers.
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
cipher = EVP_get_cipherbyname(cipnam);
if (cipher) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
// Set the key
SetBuffer(l,k);
if (l != EVP_CIPHER_key_length(cipher))
deflength = 0;
// Set also the type
SetType(cipnam);
// Set validity flag
valid = 1;
}
}
//
// Init cipher
if (valid) {
//
// Set the IV
SetIV(liv,iv);
if (deflength) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)Buffer(), 0, 1);
} else {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,Length());
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)Buffer(), 0, 1);
}
}
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(XrdSutBucket *bck)
{
// Constructor from bucket.
// Initialize a cipher of type t and length l using the key at k
// Used to import ciphers.
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
if (bck && bck->size > 0) {
valid = 1;
kXR_int32 ltyp = 0;
kXR_int32 livc = 0;
kXR_int32 lbuf = 0;
kXR_int32 lp = 0;
kXR_int32 lg = 0;
kXR_int32 lpub = 0;
kXR_int32 lpri = 0;
char *bp = bck->buffer;
int cur = 0;
memcpy(<yp,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&livc,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lbuf,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lp,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lg,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lpub,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lpri,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
// Type
if (ltyp) {
char *buf = new char[ltyp+1];
if (buf) {
memcpy(buf,bp+cur,ltyp);
buf[ltyp] = 0;
cipher = EVP_get_cipherbyname(buf);
if (!cipher)
cipher = EVP_get_cipherbyname("bf-cbc");
if (cipher) {
// Set the type
SetType(buf);
} else {
valid = 0;
}
delete[] buf;
} else
valid = 0;
cur += ltyp;
}
// IV
if (livc) {
char *buf = new char[livc];
if (buf) {
memcpy(buf,bp+cur,livc);
cur += livc;
// Set the IV
SetIV(livc,buf);
delete[] buf;
} else
valid = 0;
cur += livc;
}
// buffer
if (lbuf) {
char *buf = new char[lbuf];
if (buf) {
memcpy(buf,bp+cur,lbuf);
// Set the buffer
UseBuffer(lbuf,buf);
if (cipher && lbuf != EVP_CIPHER_key_length(cipher))
deflength = 0;
} else
valid = 0;
cur += lbuf;
}
// DH, if any
if (lp > 0 || lg > 0 || lpub > 0 || lpri > 0) {
if ((fDH = DH_new())) {
char *buf = 0;
BIGNUM *p = NULL, *g = NULL;
BIGNUM *pub = NULL, *pri = NULL;
// p
if (lp > 0) {
buf = new char[lp+1];
if (buf) {
memcpy(buf,bp+cur,lp);
buf[lp] = 0;
BN_hex2bn(&p,buf);
delete[] buf;
} else
valid = 0;
cur += lp;
}
// g
if (lg > 0) {
buf = new char[lg+1];
if (buf) {
memcpy(buf,bp+cur,lg);
buf[lg] = 0;
BN_hex2bn(&g,buf);
delete[] buf;
} else
valid = 0;
cur += lg;
}
DH_set0_pqg(fDH, p, NULL, g);
// pub_key
if (lpub > 0) {
buf = new char[lpub+1];
if (buf) {
memcpy(buf,bp+cur,lpub);
buf[lpub] = 0;
BN_hex2bn(&pub,buf);
delete[] buf;
} else
valid = 0;
cur += lpub;
}
// priv_key
if (lpri > 0) {
buf = new char[lpri+1];
if (buf) {
memcpy(buf,bp+cur,lpri);
buf[lpri] = 0;
BN_hex2bn(&pri,buf);
delete[] buf;
} else
valid = 0;
cur += lpri;
}
DH_set0_key(fDH, pub, pri);
int dhrc = 0;
DH_check(fDH,&dhrc);
if (dhrc == 0)
valid = 1;
} else
valid = 0;
}
}
//
// Init cipher
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
if (deflength) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)Buffer(), 0, 1);
} else {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,Length());
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)Buffer(), 0, 1);
}
} else
valid = 0;
}
if (!valid) {
Cleanup();
}
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(bool padded, int bits, char *pub,
int lpub, const char *t)
{
// Constructor for key agreement.
// If pub is not defined, generates a DH full key,
// the public part and parameters can be retrieved using Public().
// The number of random bits to be used in 'bits'.
// If pub is defined with the public part and parameters of the
// counterpart fully initialize a cipher with that information.
// Sets also the name to 't', if different from the default one.
// Used for key agreement.
EPNAME("sslCipher::XrdCryptosslCipher");
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
if (!pub) {
DEBUG("generate DH full key");
//
// at least 128 bits
bits = (bits < kDHMINBITS) ? kDHMINBITS : bits;
//
// Generate params for DH object
fDH = DH_new();
if (fDH && DH_generate_parameters_ex(fDH, bits, DH_GENERATOR_5, NULL)) {
int prc = 0;
DH_check(fDH,&prc);
if (prc == 0) {
//
// Generate DH key
if (DH_generate_key(fDH)) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx)
valid = 1;
}
}
}
} else {
DEBUG("initialize cipher from key-agreement buffer");
//
char *ktmp = 0;
int ltmp = 0;
// Extract string with bignumber
BIGNUM *bnpub = 0;
char *pb = strstr(pub,"---BPUB---");
char *pe = strstr(pub,"---EPUB--"); // one less (pub not null-terminated)
if (pb && pe) {
lpub = (int)(pb-pub);
pb += 10;
*pe = 0;
BN_hex2bn(&bnpub, pb);
*pe = '-';
}
if (bnpub) {
//
// Prepare to decode the input buffer
BIO *biop = BIO_new(BIO_s_mem());
if (biop) {
//
// Write buffer into BIO
BIO_write(biop,pub,lpub);
//
// Create a key object
if ((fDH = DH_new())) {
//
// Read parms from BIO
PEM_read_bio_DHparams(biop,&fDH,0,0);
int prc = 0;
DH_check(fDH,&prc);
if (prc == 0) {
//
// generate DH key
if (DH_generate_key(fDH)) {
// Now we can compute the cipher
ktmp = new char[DH_size(fDH)];
memset(ktmp, 0, DH_size(fDH));
if (ktmp) {
if (padded) {
ltmp = DH_compute_key_padded((unsigned char *)ktmp,bnpub,fDH);
} else {
ltmp = DH_compute_key((unsigned char *)ktmp,bnpub,fDH);
}
if (ltmp > 0) valid = 1;
}
}
}
}
BIO_free(biop);
}
BN_free( bnpub );
}
//
// If a valid key has been computed, set the cipher
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
if ((cipher = EVP_get_cipherbyname(cipnam))) {
// At most EVP_MAX_KEY_LENGTH bytes
ltmp = (ltmp > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : ltmp;
int ldef = EVP_CIPHER_key_length(cipher);
// Try setting the key length
if (ltmp != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,ltmp);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if (ltmp == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the ltmp bytes at ktmp
SetBuffer(ltmp,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
} else
valid = 0;
}
// Cleanup
if (ktmp) {delete[] ktmp; ktmp = 0;}
}
// Cleanup, if invalid
if (!valid)
Cleanup();
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const XrdCryptosslCipher &c)
: XrdCryptoCipher()
{
// Copy Constructor
// Basics
deflength = c.deflength;
valid = c.valid;
ctx = 0;
// IV
lIV = 0;
fIV = 0;
SetIV(c.lIV,c.fIV);
// Cipher
cipher = c.cipher;
// Set the key
SetBuffer(c.Length(),c.Buffer());
// Set also the type
SetType(c.Type());
// DH
fDH = 0;
if (valid && c.fDH) {
valid = 0;
if ((fDH = DH_new())) {
const BIGNUM *p, *g;
DH_get0_pqg(c.fDH, &p, NULL, &g);
DH_set0_pqg(fDH, p ? BN_dup(p) : NULL, NULL, g ? BN_dup(g) : NULL);
const BIGNUM *pub, *pri;
DH_get0_key(c.fDH, &pub, &pri);
DH_set0_key(fDH, pub ? BN_dup(pub) : NULL, pri ? BN_dup(pri) : NULL);
int dhrc = 0;
DH_check(fDH,&dhrc);
if (dhrc == 0)
valid = 1;
}
}
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (!ctx)
valid = 0;
}
if (!valid) {
Cleanup();
}
}
//____________________________________________________________________________
XrdCryptosslCipher::~XrdCryptosslCipher()
{
// Destructor.
// Cleanup IV
if (fIV)
delete[] fIV;
// Cleanups
if (valid)
EVP_CIPHER_CTX_free(ctx);
Cleanup();
}
//____________________________________________________________________________
void XrdCryptosslCipher::Cleanup()
{
// Cleanup temporary memory
// Cleanup IV
if (fDH) {
DH_free(fDH);
fDH = 0;
}
}
//____________________________________________________________________________
bool XrdCryptosslCipher::Finalize(bool padded,
char *pub, int /*lpub*/, const char *t)
{
// Finalize cipher during key agreement. Should be called
// for a cipher build with special constructor defining member fDH.
// The buffer pub should contain the public part of the counterpart.
// Sets also the name to 't', if different from the default one.
// Used for key agreement.
EPNAME("sslCipher::Finalize");
if (!fDH) {
DEBUG("DH undefined: this cipher cannot be finalized"
" by this method");
return 0;
}
char *ktmp = 0;
int ltmp = 0;
valid = 0;
if (pub) {
//
// Extract string with bignumber
BIGNUM *bnpub = 0;
char *pb = strstr(pub,"---BPUB---");
char *pe = strstr(pub,"---EPUB--");
if (pb && pe) {
//lpub = (int)(pb-pub);
pb += 10;
*pe = 0;
BN_hex2bn(&bnpub, pb);
*pe = '-';
}
if (bnpub) {
// Now we can compute the cipher
ktmp = new char[DH_size(fDH)];
memset(ktmp, 0, DH_size(fDH));
if (ktmp) {
if (padded) {
ltmp = DH_compute_key_padded((unsigned char *)ktmp,bnpub,fDH);
} else {
ltmp = DH_compute_key((unsigned char *)ktmp,bnpub,fDH);
}
if (ltmp > 0) valid = 1;
}
BN_free(bnpub);
bnpub=0;
}
//
// If a valid key has been computed, set the cipher
if (valid) {
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
if ((cipher = EVP_get_cipherbyname(cipnam))) {
// At most EVP_MAX_KEY_LENGTH bytes
ltmp = (ltmp > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : ltmp;
int ldef = EVP_CIPHER_key_length(cipher);
// Try setting the key length
if (ltmp != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,ltmp);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if (ltmp == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the ltmp bytes at ktmp
SetBuffer(ltmp,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
}
// Cleanup
if (ktmp) {delete[] ktmp; ktmp = 0;}
}
// Cleanup, if invalid
if (!valid) {
EVP_CIPHER_CTX_free(ctx);
Cleanup();
}
// We are done
return valid;
}
//_____________________________________________________________________________
int XrdCryptosslCipher::Publen()
{
// Minimum length of export format of public key
static int lhdr = strlen("-----BEGIN DH PARAMETERS-----"
"-----END DH PARAMETERS-----") + 3;
if (fDH) {
// minimum length of the core is 22 bytes
int l = 2*DH_size(fDH);
if (l < 22) l = 22;
// for headers
l += lhdr;
// some margin
return (l+20);
} else
return 0;
}
//_____________________________________________________________________________
char *XrdCryptosslCipher::Public(int &lpub)
{
// Return buffer with the public part of the DH key and the shared
// parameters; lpub contains the length of the meaningful bytes.
// Buffer should be deleted by the caller.
static int lhend = strlen("-----END DH PARAMETERS-----");
if (fDH) {
//
// Calculate and write public key hex
const BIGNUM *pub;
DH_get0_key(fDH, &pub, NULL);
char *phex = BN_bn2hex(pub);
int lhex = strlen(phex);
//
// Prepare bio to export info buffer
BIO *biop = BIO_new(BIO_s_mem());
if (biop) {
int ltmp = Publen() + lhex + 20;
char *pub = new char[ltmp];
if (pub) {
// Write parms first
PEM_write_bio_DHparams(biop,fDH);
// Read key from BIO to buf
BIO_read(biop,(void *)pub,ltmp);
BIO_free(biop);
// Add public key
char *p = strstr(pub,"-----END DH PARAMETERS-----");
// Buffer length up to now
lpub = (int)(p - pub) + lhend + 1;
if (phex && p) {
// position at the end
p += (lhend+1);
// Begin of public key hex
memcpy(p,"---BPUB---",10);
p += 10;
// Calculate and write public key hex
memcpy(p,phex,lhex);
OPENSSL_free(phex);
// End of public key hex
p += lhex;
memcpy(p,"---EPUB---",10);
// Calculate total length
lpub += (20 + lhex);
} else {
if (phex) OPENSSL_free(phex);
}
// return
return pub;
}
} else {
if (phex) OPENSSL_free(phex);
}
}
lpub = 0;
return (char *)0;
}
//_____________________________________________________________________________
void XrdCryptosslCipher::PrintPublic(BIGNUM *pub)
{
// Print public part
//
// Prepare bio to export info buffer
BIO *biop = BIO_new(BIO_s_mem());
if (biop) {
// Use a DSA structure to export the public part
DSA *dsa = DSA_new();
if (dsa) {
DSA_set0_key(dsa, BN_dup(pub), NULL);
// Write public key to BIO
PEM_write_bio_DSA_PUBKEY(biop,dsa);
// Read key from BIO to buf
int lpub = Publen();
char *bpub = new char[lpub];
if (bpub) {
BIO_read(biop,(void *)bpub,lpub);
cerr << bpub << endl;
delete[] bpub;
}
DSA_free(dsa);
}
BIO_free(biop);
}
}
//_____________________________________________________________________________
XrdSutBucket *XrdCryptosslCipher::AsBucket()
{
// Return pointer to a bucket created using the internal information
// serialized
// The bucket is responsible for the allocated memory
XrdSutBucket *buck = (XrdSutBucket *)0;
if (valid) {
// Serialize .. total length
kXR_int32 lbuf = Length();
kXR_int32 ltyp = Type() ? strlen(Type()) : 0;
kXR_int32 livc = lIV;
const BIGNUM *p, *g;
const BIGNUM *pub, *pri;
DH_get0_pqg(fDH, &p, NULL, &g);
DH_get0_key(fDH, &pub, &pri);
char *cp = BN_bn2hex(p);
char *cg = BN_bn2hex(g);
char *cpub = BN_bn2hex(pub);
char *cpri = BN_bn2hex(pri);
kXR_int32 lp = cp ? strlen(cp) : 0;
kXR_int32 lg = cg ? strlen(cg) : 0;
kXR_int32 lpub = cpub ? strlen(cpub) : 0;
kXR_int32 lpri = cpri ? strlen(cpri) : 0;
int ltot = 7*sizeof(kXR_int32) + ltyp + Length() + livc +
lp + lg + lpub + lpri;
char *newbuf = new char[ltot];
if (newbuf) {
int cur = 0;
memcpy(newbuf+cur,<yp,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&livc,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&lbuf,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&lp,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&lg,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&lpub,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(newbuf+cur,&lpri,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
if (Type()) {
memcpy(newbuf+cur,Type(),ltyp);
cur += ltyp;
}
if (fIV) {
memcpy(newbuf+cur,fIV,livc);
cur += livc;
}
if (Buffer()) {
memcpy(newbuf+cur,Buffer(),lbuf);
cur += lbuf;
}
if (cp) {
memcpy(newbuf+cur,cp,lp);
cur += lp;
OPENSSL_free(cp);
}
if (cg) {
memcpy(newbuf+cur,cg,lg);
cur += lg;
OPENSSL_free(cg);
}
if (cpub) {
memcpy(newbuf+cur,cpub,lpub);
cur += lpub;
OPENSSL_free(cpub);
}
if (cpri) {
memcpy(newbuf+cur,cpri,lpri);
cur += lpri;
OPENSSL_free(cpri);
}
// The bucket now
buck = new XrdSutBucket(newbuf,ltot,kXRS_cipher);
}
}
return buck;
}
//____________________________________________________________________________
void XrdCryptosslCipher::SetIV(int l, const char *iv)
{
// Set IV from l bytes at iv. If !iv, sets the IV length.
if (fIV) {
delete[] fIV;
fIV = 0;
lIV = 0;
}
if (l > 0) {
if (iv) {
fIV = new char[l];
if (fIV) memcpy(fIV,iv,l);
}
lIV = l;
}
}
//____________________________________________________________________________
char *XrdCryptosslCipher::RefreshIV(int &l)
{
// Regenerate IV and return it
// Generate a new IV
GenerateIV();
// Set output
l = lIV;
return fIV;
}
//____________________________________________________________________________
void XrdCryptosslCipher::GenerateIV()
{
// Generate IV