-
Notifications
You must be signed in to change notification settings - Fork 9
/
rncryptor_c.c
1510 lines (1308 loc) · 37.1 KB
/
rncryptor_c.c
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
#include "rncryptor_c.h"
#include "mutils.h"
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
/*
** as per:
** https://github.com/RNCryptor/RNCryptor-Spec/blob/master/RNCryptor-Spec-v3.md
** muquit@muquit.com
** Documentation is in the header file rncryptor_c.h
*/
static const char *libname = "libcryptorc";
static int sdebug = 0;
typedef struct _RNCryptorInfo
{
/* data format starts */
unsigned char
version,
options;
unsigned char
encryption_salt[8];
unsigned char
hmac_salt[8];
unsigned char
iv[16];
unsigned char
*cipher_text;
unsigned long
cipher_text_length;
unsigned char
hmac[32];
/* data format ends */
unsigned char
encr_key[32],
hmac_key[32];
const char
*infile_path;
MutilsBlob
*blob;
int
kdf_iter;
unsigned int
header_size;
}RNCryptorInfo;
/* function prototypes -starts-*/
static void log_err(const char *fmt, ...);
static void log_debug(const char *fmt, ...);
static RNCryptorInfo *allocate_rncryptor_info(void);
static void free_rncryptor_info(RNCryptorInfo *ci);
static RNCryptorInfo *decode_encrypted_blob(MutilsBlob *blob);
static int verify_hmac(RNCryptorInfo *ci,const char *password,
int password_len);
/* function prototypes -ends-*/
#define CHECK_MALLOC(p) \
do \
{ \
if (p == NULL) \
{\
log_err("%s (%d) - ERROR: memory allocation problem\n",__FILE__,__LINE__); \
goto ExitProcessing; \
}\
}while(0)
/*
** from: https://cryptocoding.net/index.php/Coding_rules#Compare_secret_strings_in_constant_time
** compare in constant time
** Issue# 1
*/
int util_cmp_const(const void * a, const void *b, const size_t size)
{
const unsigned char *_a = (const unsigned char *) a;
const unsigned char *_b = (const unsigned char *) b;
unsigned char result = 0;
size_t i;
for (i = 0; i < size; i++) {
result |= _a[i] ^ _b[i];
}
return result; /* returns 0 if equal, nonzero otherwise */
}
/* id is 0 or 1 */
void rncryptorc_set_debug(int d)
{
sdebug = d;
if (d == 1)
{
(void) fprintf(stderr," (Compiled with OpenSSL version: %s)\n",
SSLeay_version(SSLEAY_VERSION));
}
}
/*
** Write log message to stderr
*/
static void log_err(const char *fmt, ...)
{
va_list
args;
va_start(args, fmt);
vfprintf(stderr,fmt,args);
va_end(args);
}
static void log_debug(const char *fmt, ...)
{
va_list
args;
char
buf2[1024],
buf[1024];
if (!sdebug)
{
return;
}
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
snprintf(buf2, sizeof(buf2), "%s: %s", libname, buf);
(void) fprintf(stderr,"%s\n",buf2);
(void)fflush(stderr);
va_end(args);
}
unsigned char *rncryptorc_decrypt_file_with_password(const char *infile_path,
int kdf_iter,
const char *password,
int password_length,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
MutilsBlob
*blob = NULL;
unsigned char
*outdata = NULL;
*outdata_len = 0;
blob = mutils_file_to_blob(infile_path);
if (blob == NULL)
{
(void)snprintf(errbuf,errbuf_len-1,
"Error: could not open file %s for reading",infile_path);
return(NULL);
}
log_debug("%s:%d - input data size %d bytes",
MCFL,
blob->length);
outdata = rncryptorc_decrypt_data_with_password(blob->data,
blob->length,
kdf_iter,
password,password_length,
outdata_len,
errbuf,errbuf_len);
mutils_destroy_blob(blob);
return (outdata);
}
unsigned char *rncryptorc_decrypt_file_with_key(const char *infile_path,
int kdf_iter,
const unsigned char *encr_key,
const unsigned char *hmac_key,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
MutilsBlob
*blob = NULL;
unsigned char
*outdata = NULL;
blob = mutils_file_to_blob(infile_path);
if (blob == NULL)
{
(void)snprintf(errbuf,errbuf_len-1,
"Error: could not open file %s for reading",
infile_path);
return(NULL);
}
outdata = rncryptorc_decrypt_data_with_key(blob->data,blob->length,
kdf_iter,
encr_key,
hmac_key,
outdata_len,
errbuf,
errbuf_len);
mutils_destroy_blob(blob);
return(outdata);
}
unsigned char *rncryptorc_encrypt_file_with_password(const char *infile_path,
int kdf_iter,
const char *password,
int password_length,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
MutilsBlob
*blob = NULL;
unsigned char
*outdata = NULL;
blob = mutils_file_to_blob(infile_path);
if (blob == NULL)
{
(void)snprintf(errbuf,errbuf_len-1,
"Error: could not open file %s for reading",infile_path);
return(NULL);
}
log_debug("%s:%d - input data size %d bytes",
MCFL,
blob->length);
outdata = rncryptorc_encrypt_data_with_password(blob->data,
blob->length,
kdf_iter,
password,password_length,
outdata_len,
errbuf,errbuf_len);
mutils_destroy_blob(blob);
return(outdata);
}
unsigned char *rncryptorc_encrypt_file_with_key(const char *infile_path,
int kdf_iter,
const unsigned char *encr_key,
const unsigned char *hmac_key,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
MutilsBlob
*blob = NULL;
unsigned char
*outdata = NULL;
/* read the input file as a blob */
blob = mutils_file_to_blob(infile_path);
if (blob == NULL)
{
(void)snprintf(errbuf,errbuf_len-1,
"Error: could not open file %s for reading",infile_path);
return(NULL);
}
outdata = rncryptorc_encrypt_data_with_key(blob->data,
blob->length,
kdf_iter,
encr_key,
hmac_key,
outdata_len,
errbuf,
errbuf_len);
mutils_destroy_blob(blob);
return(outdata);
}
/*
** Allocate memory and initialize values to default
*/
static RNCryptorInfo *allocate_rncryptor_info(void)
{
RNCryptorInfo *ci = (RNCryptorInfo *)malloc(sizeof(RNCryptorInfo));
CHECK_MALLOC(ci);
memset(ci,0,sizeof(RNCryptorInfo));
ci->version = RNCRYPTOR_DATA_FORMAT_VERSION;
/* initialize to password based encr/decr */
ci->options = 0x1;
ci->header_size =
1 /* version */
+ 1 /* options */
+ 8 /* encryption salt */
+ 8 /* HMAC salt */
+ 16; /* IV */
ci->kdf_iter = RNCRYPTOR3_KDF_ITER;
return ci;
ExitProcessing:
return(NULL);
}
static void free_rncryptor_info(RNCryptorInfo *ci)
{
if (ci)
{
if (ci->cipher_text)
{
(void)free((char *)ci->cipher_text);
}
(void) free((char *)ci);
}
}
static RNCryptorInfo *decode_encrypted_blob(MutilsBlob *blob)
{
RNCryptorInfo
*ci = NULL;
ci = allocate_rncryptor_info();
if (!ci)
{
goto ExitProcessing;
}
ci->blob = blob;
/* version */
ci->version = mutils_read_blob_byte(blob);
/* update code when version changes */
if (ci->version != RNCRYPTOR_DATA_FORMAT_VERSION)
{
log_err("Error: Unsupported RNCryptor data format version %02x",ci->version);
goto ExitProcessing;
}
/* options */
ci->options = mutils_read_blob_byte(blob);
if (ci->options == 0x01) /* password based */
{
/* encryption salt */
mutils_read_blob(blob,sizeof(ci->encryption_salt),ci->encryption_salt);
/* hmac salt */
mutils_read_blob(blob,sizeof(ci->hmac_salt),ci->hmac_salt);
}
else
{
/* update header size. default is password based */
ci->header_size =
1 /* version */
+ 1 /* option */
+ 16; /* IV */
}
/* iv */
mutils_read_blob(blob,sizeof(ci->iv),ci->iv);
/* done reading header. now find out the length of cypther text */
ci->cipher_text_length = blob ->length - sizeof(ci->hmac) - ci->header_size;
log_debug("%s:%d - Cipher text length %lu",
MCFL,
ci->cipher_text_length);
ci->cipher_text =
(unsigned char *)malloc(ci->cipher_text_length * sizeof(unsigned char *));;
CHECK_MALLOC(ci->cipher_text);
mutils_read_blob(blob,ci->cipher_text_length,ci->cipher_text);
mutils_read_blob(blob,sizeof(ci->hmac),ci->hmac);
if (blob->length != blob->offset)
{
log_err("ERROR: Corrupt encrypted file: %s",ci->infile_path);
goto ExitProcessing;
}
return(ci);
ExitProcessing:
if (ci)
{
free_rncryptor_info(ci);
}
return(NULL);
}
/*
** returns SUCCESS or FAILRUE
** if key based encryption/decryption is used, pass ci->hmac_key, also pass
** password as NULL and length of pasword as 0
*/
static int verify_hmac(RNCryptorInfo *ci,const char *password, int password_len)
{
unsigned char
hmac_sha256[32];
#ifdef LIBRESSL_VERSION_NUMBER
const EVP_MD
*sha256=NULL;
HMAC_CTX
hmac_ctx;
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
const EVP_MD
*sha256=NULL;
HMAC_CTX
hmac_ctx;
#else
/* OpenSSL 1.1.x*/
HMAC_CTX
*hmac_ctx;
#endif
#endif
unsigned int
hmac_len;
int
rc;
if (ci == NULL)
{
return(FAILURE);
}
if (password != NULL)
{
/* Derive hmac key from password using hmac salt and iteration as per RFC2898 */
rc = PKCS5_PBKDF2_HMAC_SHA1(password, password_len,
ci->hmac_salt,
sizeof(ci->hmac_salt),
ci->kdf_iter,
sizeof(ci->hmac_key),
ci->hmac_key); /* ci->hmac_key is returend */
if (rc != 1)
{
log_err("ERROR: Could not derive key from password with hmac salt and iter");
goto ExitProcessing;
}
}
else
{
/* caller must pass ci->hmac_key */
}
/*
** calculate HMAC-SHA256 of (data-32) and compare that with the HMAC-SHA256
** which is the last 32 bytes of the data
*/
#ifdef LIBRESSL_VERSION_NUMBER
sha256 = EVP_sha256();
HMAC_CTX_init(&hmac_ctx);
HMAC_Init(&hmac_ctx,ci->hmac_key,32,sha256);
HMAC_Update(&hmac_ctx,ci->blob->data,ci->blob->length - 32);
HMAC_Final(&hmac_ctx,hmac_sha256,&hmac_len);
HMAC_CTX_cleanup(&hmac_ctx);
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
sha256 = EVP_sha256();
HMAC_CTX_init(&hmac_ctx);
HMAC_Init(&hmac_ctx,ci->hmac_key,32,sha256);
HMAC_Update(&hmac_ctx,ci->blob->data,ci->blob->length - 32);
HMAC_Final(&hmac_ctx,hmac_sha256,&hmac_len);
HMAC_CTX_cleanup(&hmac_ctx);
#else
hmac_ctx = HMAC_CTX_new();
HMAC_Init_ex(hmac_ctx,ci->hmac_key,32,EVP_sha256(),NULL);
HMAC_Update(hmac_ctx,ci->blob->data,ci->blob->length - 32);
HMAC_Final(hmac_ctx,hmac_sha256,&hmac_len);
#endif
#endif
rc = util_cmp_const(ci->hmac,hmac_sha256,32);
if (rc != 0)
{
log_err("ERROR: Could not verify HMAC");
goto ExitProcessing;
}
return SUCCESS;
ExitProcessing:
return(FAILURE);
}
unsigned char *rncryptorc_encrypt_data_with_password(const unsigned char *indata,
int indata_len,
int kdf_iter,
const char *password,
int password_length,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
int
rc=FAILURE;
unsigned char
encr_salt_8[8],
hmac_salt_8[8],
iv_16[16];
unsigned char
*output = NULL;
*outdata_len = 0;
log_debug("%s:%d - verifying input",MCFL);
if (errbuf_len <= 0)
{
log_err("ERROR:Invalid errbuf len %d",errbuf_len);
goto ExitProcessing;
}
memset(errbuf,0,errbuf_len);
memset(encr_salt_8,0,8);
memset(hmac_salt_8,0,8);
memset(iv_16,0,16);
/* input can be empty */
if (password == NULL || *password == '\0')
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Password can not be NULL");
goto ExitProcessing;
}
if (password_length <= 0)
{
(void)snprintf(errbuf,errbuf_len-1,"Invalid password length %d",password_length);
goto ExitProcessing;
}
/* 8 byte hmac salt */
rc = RAND_bytes(hmac_salt_8,8);
if (rc != 1)
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not generate random HMAC salt");
goto ExitProcessing;
}
/* 8 byte encryption salt, we're using password */
rc = RAND_bytes(encr_salt_8,8);
if (rc != 1)
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not generate random encryption salt");
goto ExitProcessing;
}
/* 16 byte iv */
rc = RAND_bytes(iv_16,16);
if (rc != 1)
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not generate random IV");
goto ExitProcessing;
}
output = rncryptorc_encrypt_data_with_password_with_salts_and_iv(indata,
indata_len,
kdf_iter,
password,
password_length,
encr_salt_8,
hmac_salt_8,
iv_16,
outdata_len,
errbuf,
errbuf_len);
ExitProcessing:
return(output);
}
unsigned char *rncryptorc_encrypt_data_with_password_with_salts_and_iv(const unsigned char *indata,
int indata_len,
int kdf_iter,
const char *password,
int password_length,
unsigned char *encr_salt_8,
unsigned char *hmac_salt_8,
unsigned char *iv_16,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
RNCryptorInfo
*ci = NULL;
MutilsBlob
*blob = NULL;
#ifdef LIBRESSL_VERSION_NUMBER
const EVP_MD
*sha256 = NULL;
EVP_CIPHER_CTX
cipher_ctx;
HMAC_CTX
hmac_ctx;
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
const EVP_MD
*sha256 = NULL;
EVP_CIPHER_CTX
cipher_ctx;
HMAC_CTX
hmac_ctx;
#else
/* OpenSSL 1.1.x*/
EVP_CIPHER_CTX
*cipher_ctx;
HMAC_CTX
*hmac_ctx;
#endif
#endif
int
rc=FAILURE;
int
outlen1 = 0,
outlen2 = 0;
unsigned int
hmac_len;
unsigned char
hmac_sha256[32];
unsigned char
*output = NULL;
unsigned int
blocksize = 16;
unsigned char
*ciphertext = NULL;
unsigned char
encr_key[32],
hmac_key[32];
int
ciphertext_len;
log_debug("%s:%d - verifying input",MCFL);
if (errbuf_len <= 0)
{
log_err("ERROR:Invalid errbuf len %d",errbuf_len);
goto ExitProcessing;
}
memset(errbuf,0,errbuf_len);
memset(encr_key,0,sizeof(encr_key));
memset(hmac_key,0,sizeof(hmac_key));
if (password == NULL || *password == '\0')
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Password can not be NULL");
goto ExitProcessing;
}
if (password_length <= 0)
{
(void)snprintf(errbuf,errbuf_len-1,"Invalid password length %d",password_length);
goto ExitProcessing;
}
ci = allocate_rncryptor_info();
if (!ci)
{
goto ExitProcessing;
}
ci->options = 0x01;
/* Derive cipher key from password using encr salt and iteration as per RFC2898 */
log_debug("%s:%d - Deriving Cipher key with salt, iterations %d",
MCFL,
kdf_iter);
rc = PKCS5_PBKDF2_HMAC_SHA1(password,password_length,
encr_salt_8,
8,
kdf_iter,
32,
encr_key); /* encr_key is returend */
if (rc != 1)
{
log_err("ERROR: Could not derive key from password with encr salt and iter");
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not derive key from password with encr salt and iter");
goto ExitProcessing;
}
#ifdef LIBRESSL_VERSION_NUMBER
EVP_EncryptInit(&cipher_ctx,EVP_aes_256_cbc(),encr_key,iv_16);
blocksize = EVP_CIPHER_CTX_block_size(&cipher_ctx);
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
EVP_EncryptInit(&cipher_ctx,EVP_aes_256_cbc(),encr_key,iv_16);
blocksize = EVP_CIPHER_CTX_block_size(&cipher_ctx);
#else
cipher_ctx = EVP_CIPHER_CTX_new();
EVP_EncryptInit_ex(cipher_ctx, EVP_aes_256_cbc(), NULL, encr_key, iv_16);
blocksize = EVP_CIPHER_CTX_block_size(cipher_ctx);
#endif
#endif
log_debug("%s:%d - Block size: %ld",MCFL,blocksize);
if (indata == NULL && indata_len == 0)
{
blob = mutils_allocate_blob(blocksize);
}
else
{
blob = mutils_allocate_blob(indata_len);
}
CHECK_MALLOC(blob);
log_debug("%s:%d - input data size %d bytes",
MCFL,
indata_len);
log_debug("%s:%d - Encoding",MCFL);
/*
** Encode. memory will be re-allocated for blob if needed.
*/
/* version */
mutils_write_blob_byte(blob,ci->version);
/* options */
mutils_write_blob_byte(blob,ci->options);
/* 8 byte encryption salt, we're using password */
mutils_write_blob(blob,8,encr_salt_8);
/* 8 byte hmac salt */
mutils_write_blob(blob,8,hmac_salt_8);
/* 16 byte iv */
mutils_write_blob(blob,16,iv_16);
log_debug("%s:%d - Deriving HMAC key with salt, iterations %d",
MCFL,
kdf_iter);
/* Derive HMAC key from password using hmac salt and iteration as per RFC2898 */
rc = PKCS5_PBKDF2_HMAC_SHA1(password,password_length,
hmac_salt_8,
8,
kdf_iter,
32,
hmac_key); /* hmac_key is returend */
if (rc != 1)
{
log_err("ERROR: Could not derive key from password with hmac salt and iter");
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not derive key from password with hmac salt and iter");
goto ExitProcessing;
}
log_debug("%s:%d - Encrypting..",MCFL);
/* allocate space for cipher text */
ciphertext_len = indata_len + blocksize - (indata_len % blocksize);
ciphertext = (unsigned char *) malloc(ciphertext_len * sizeof(unsigned char));
CHECK_MALLOC(ciphertext);
#ifdef LIBRESSL_VERSION_NUMBER
EVP_EncryptUpdate(&cipher_ctx,ciphertext,&outlen1,indata,indata_len);
EVP_EncryptFinal(&cipher_ctx,ciphertext + outlen1,&outlen2);
EVP_CIPHER_CTX_cleanup(&cipher_ctx);
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
EVP_EncryptUpdate(&cipher_ctx,ciphertext,&outlen1,indata,indata_len);
EVP_EncryptFinal(&cipher_ctx,ciphertext + outlen1,&outlen2);
EVP_CIPHER_CTX_cleanup(&cipher_ctx);
#else
EVP_EncryptUpdate(cipher_ctx, ciphertext, &outlen1, indata, indata_len);
EVP_EncryptFinal_ex(cipher_ctx, ciphertext + outlen1, &outlen2);
#endif
#endif
mutils_write_blob(blob,outlen1 + outlen2,ciphertext);
log_debug("%s:%d - Plain text length: %d",MCFL,indata_len);
log_debug("%s:%d - Cipther text length: %d",MCFL,outlen1 + outlen2);
log_debug("%s:%d - Padding %d bytes",
MCFL,
(ciphertext_len - indata_len));
log_debug("%s:%d - outdata len: %d",MCFL,outlen1 + outlen2);
log_debug("%s:%d - calculating HMAC-SHA256",MCFL);
/* calculate HMAC-SHA256 */
#ifdef LIBRESSL_VERSION_NUMBER
sha256 = EVP_sha256();
HMAC_CTX_init(&hmac_ctx);
HMAC_Init(&hmac_ctx,hmac_key,sizeof(hmac_key),sha256);
HMAC_Update(&hmac_ctx,blob->data,blob->length);
HMAC_Final(&hmac_ctx,hmac_sha256,&hmac_len);
HMAC_CTX_cleanup(&hmac_ctx);
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
sha256 = EVP_sha256();
HMAC_CTX_init(&hmac_ctx);
HMAC_Init(&hmac_ctx,hmac_key,sizeof(hmac_key),sha256);
HMAC_Update(&hmac_ctx,blob->data,blob->length);
HMAC_Final(&hmac_ctx,hmac_sha256,&hmac_len);
HMAC_CTX_cleanup(&hmac_ctx);
#else
hmac_ctx = HMAC_CTX_new();
HMAC_Init_ex(hmac_ctx,hmac_key,sizeof(hmac_key),EVP_sha256(),NULL);
HMAC_Update(hmac_ctx,blob->data,blob->length);
HMAC_Final(hmac_ctx,hmac_sha256,&hmac_len);
#endif
#endif
mutils_write_blob(blob,hmac_len,hmac_sha256);
log_debug("%s:%d - Output lenth %lu",MCFL,blob->length);
output = (unsigned char *)malloc(blob->length * sizeof(unsigned char));
CHECK_MALLOC(output);
memcpy(output,blob->data,blob->length);
*outdata_len = blob->length;
ExitProcessing:
if (ci)
{
free_rncryptor_info(ci);
}
if (blob)
{
mutils_destroy_blob(blob);
}
if (ciphertext)
{
(void)free((char *)ciphertext);
}
return(output);
}
unsigned char *rncryptorc_encrypt_data_with_key(const unsigned char *indata,
int indata_len,
int kdf_iter,
const unsigned char *encr_key,
const unsigned char *hmac_key,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
unsigned char
iv_16[16];
unsigned char
*output = NULL;
int
rc;
*outdata_len = 0;
memset(iv_16,0,16);
log_debug("%s:%d - verifying input",MCFL);
if (errbuf_len <= 0)
{
log_err("ERROR:Invalid errbuf len %d",errbuf_len);
goto ExitProcessing;
}
memset(errbuf,0,errbuf_len);
/* generate 16 byte iv */
rc = RAND_bytes(iv_16,16);
if (rc != 1)
{
(void)snprintf(errbuf,errbuf_len-1,"%s",
"Could not generate secure random IV");
goto ExitProcessing;
}
output = rncryptorc_encrypt_data_with_key_iv(indata,
indata_len,
kdf_iter,
encr_key,
hmac_key,
iv_16,
outdata_len,
errbuf,
errbuf_len);
ExitProcessing:
return(output);
}
unsigned char *rncryptorc_encrypt_data_with_key_iv(const unsigned char *indata,
int indata_len,
int kdf_iter,
const unsigned char *encr_key_32,
const unsigned char *hmac_key_32,
const unsigned char *iv_16,
int *outdata_len,
char *errbuf,
int errbuf_len)
{
RNCryptorInfo
*ci = NULL;
MutilsBlob
*blob = NULL;
#ifdef LIBRESSL_VERSION_NUMBER
const EVP_MD
*sha256 = NULL;
EVP_CIPHER_CTX
cipher_ctx;
HMAC_CTX
hmac_ctx;
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
const EVP_MD
*sha256 = NULL;
EVP_CIPHER_CTX
cipher_ctx;
HMAC_CTX
hmac_ctx;
#else
/* OpenSSL 1.1.x*/
EVP_CIPHER_CTX
*cipher_ctx;
HMAC_CTX
*hmac_ctx;
#endif
#endif
int
outlen1 = 0,
outlen2 = 0;
unsigned int
hmac_len;
unsigned char
hmac_sha256[32];
unsigned char
*output = NULL;
unsigned int
blocksize = 16;
unsigned char
*ciphertext = NULL;
int
ciphertext_length;
log_debug("%s:%d - verifying input",MCFL);
if (errbuf_len <= 0)
{
log_err("ERROR:Invalid errbuf len %d",errbuf_len);
goto ExitProcessing;
}
memset(errbuf,0,errbuf_len);
#ifdef LIBRESSL_VERSION_NUMBER
EVP_EncryptInit(&cipher_ctx,EVP_aes_256_cbc(),encr_key_32,iv_16);
blocksize = EVP_CIPHER_CTX_block_size(&cipher_ctx);
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
EVP_EncryptInit(&cipher_ctx,EVP_aes_256_cbc(),encr_key_32,iv_16);
blocksize = EVP_CIPHER_CTX_block_size(&cipher_ctx);
#else
cipher_ctx = EVP_CIPHER_CTX_new();
EVP_EncryptInit_ex(cipher_ctx, EVP_aes_256_cbc(), NULL, encr_key_32, iv_16);
blocksize = EVP_CIPHER_CTX_block_size(cipher_ctx);
#endif
#endif
log_debug("%s:%d - Block size: %ld",MCFL,blocksize);
if (indata == NULL && indata_len == 0)
{
/* memory will be re-allocated as needed */
blob = mutils_allocate_blob(blocksize);
}
else
{
/* memory will be re-allocated as needed */
blob = mutils_allocate_blob(indata_len);
}
CHECK_MALLOC(blob);
log_debug("%s:%d - input data size %d bytes",
MCFL,
indata_len);