summaryrefslogtreecommitdiffstats
path: root/include/linux/crypto.h
blob: 6eb06101089fe3d6d584008381066c632a6ef4bc (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
/*
 * Scatterlist Cryptographic API.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
 * and Nettle, by Niels Möller.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version.
 *
 */
#ifndef _LINUX_CRYPTO_H
#define _LINUX_CRYPTO_H

#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/bug.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/completion.h>

/*
 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
 * arbitrary modules to be loaded. Loading from userspace may still need the
 * unprefixed names, so retains those aliases as well.
 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
 * expands twice on the same line. Instead, use a separate base name for the
 * alias.
 */
#define MODULE_ALIAS_CRYPTO(name)	\
		__MODULE_INFO(alias, alias_userspace, name);	\
		__MODULE_INFO(alias, alias_crypto, "crypto-" name)

/*
 * Algorithm masks and types.
 */
#define CRYPTO_ALG_TYPE_MASK		0x0000000f
#define CRYPTO_ALG_TYPE_CIPHER		0x00000001
#define CRYPTO_ALG_TYPE_COMPRESS	0x00000002
#define CRYPTO_ALG_TYPE_AEAD		0x00000003
#define CRYPTO_ALG_TYPE_BLKCIPHER	0x00000004
#define CRYPTO_ALG_TYPE_ABLKCIPHER	0x00000005
#define CRYPTO_ALG_TYPE_SKCIPHER	0x00000005
#define CRYPTO_ALG_TYPE_GIVCIPHER	0x00000006
#define CRYPTO_ALG_TYPE_KPP		0x00000008
#define CRYPTO_ALG_TYPE_ACOMPRESS	0x0000000a
#define CRYPTO_ALG_TYPE_SCOMPRESS	0x0000000b
#define CRYPTO_ALG_TYPE_RNG		0x0000000c
#define CRYPTO_ALG_TYPE_AKCIPHER	0x0000000d
#define CRYPTO_ALG_TYPE_DIGEST		0x0000000e
#define CRYPTO_ALG_TYPE_HASH		0x0000000e
#define CRYPTO_ALG_TYPE_SHASH		0x0000000e
#define CRYPTO_ALG_TYPE_AHASH		0x0000000f

#define CRYPTO_ALG_TYPE_HASH_MASK	0x0000000e
#define CRYPTO_ALG_TYPE_AHASH_MASK	0x0000000e
#define CRYPTO_ALG_TYPE_BLKCIPHER_MASK	0x0000000c
#define CRYPTO_ALG_TYPE_ACOMPRESS_MASK	0x0000000e

#define CRYPTO_ALG_LARVAL		0x00000010
#define CRYPTO_ALG_DEAD			0x00000020
#define CRYPTO_ALG_DYING		0x00000040
#define CRYPTO_ALG_ASYNC		0x00000080

/*
 * Set this bit if and only if the algorithm requires another algorithm of
 * the same type to handle corner cases.
 */
#define CRYPTO_ALG_NEED_FALLBACK	0x00000100

/*
 * This bit is set for symmetric key ciphers that have already been wrapped
 * with a generic IV generator to prevent them from being wrapped again.
 */
#define CRYPTO_ALG_GENIV		0x00000200

/*
 * Set if the algorithm has passed automated run-time testing.  Note that
 * if there is no run-time testing for a given algorithm it is considered
 * to have passed.
 */

#define CRYPTO_ALG_TESTED		0x00000400

/*
 * Set if the algorithm is an instance that is built from templates.
 */
#define CRYPTO_ALG_INSTANCE		0x00000800

/* Set this bit if the algorithm provided is hardware accelerated but
 * not available to userspace via instruction set or so.
 */
#define CRYPTO_ALG_KERN_DRIVER_ONLY	0x00001000

/*
 * Mark a cipher as a service implementation only usable by another
 * cipher and never by a normal user of the kernel crypto API
 */
#define CRYPTO_ALG_INTERNAL		0x00002000

/*
 * Set if the algorithm has a ->setkey() method but can be used without
 * calling it first, i.e. there is a default key.
 */
#define CRYPTO_ALG_OPTIONAL_KEY		0x00004000

/*
 * Transform masks and values (for crt_flags).
 */
#define CRYPTO_TFM_NEED_KEY		0x00000001

#define CRYPTO_TFM_REQ_MASK		0x000fff00
#define CRYPTO_TFM_RES_MASK		0xfff00000

#define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
#define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
#define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
#define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
#define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
#define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
#define CRYPTO_TFM_RES_BAD_BLOCK_LEN 	0x00800000
#define CRYPTO_TFM_RES_BAD_FLAGS 	0x01000000

/*
 * Miscellaneous stuff.
 */
#define CRYPTO_MAX_ALG_NAME		128

/*
 * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
 * declaration) is used to ensure that the crypto_tfm context structure is
 * aligned correctly for the given architecture so that there are no alignment
 * faults for C data types.  In particular, this is required on platforms such
 * as arm where pointers are 32-bit aligned but there are data types such as
 * u64 which require 64-bit alignment.
 */
#define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN

#define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))

struct scatterlist;
struct crypto_ablkcipher;
struct crypto_async_request;
struct crypto_blkcipher;
struct crypto_tfm;
struct crypto_type;
struct skcipher_givcrypt_request;

typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);

/**
 * DOC: Block Cipher Context Data Structures
 *
 * These data structures define the operating context for each block cipher
 * type.
 */

struct crypto_async_request {
	struct list_head list;
	crypto_completion_t complete;
	void *data;
	struct crypto_tfm *tfm;

	u32 flags;
};

struct ablkcipher_request {
	struct crypto_async_request base;

	unsigned int nbytes;

	void *info;

	struct scatterlist *src;
	struct scatterlist *dst;

	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

struct blkcipher_desc {
	struct crypto_blkcipher *tfm;
	void *info;
	u32 flags;
};

struct cipher_desc {
	struct crypto_tfm *tfm;
	void (*crfn)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
			     const u8 *src, unsigned int nbytes);
	void *info;
};

/**
 * DOC: Block Cipher Algorithm Definitions
 *
 * These data structures define modular crypto algorithm implementations,
 * managed via crypto_register_alg() and crypto_unregister_alg().
 */

/**
 * struct ablkcipher_alg - asynchronous block cipher definition
 * @min_keysize: Minimum key size supported by the transformation. This is the
 *		 smallest key length supported by this transformation algorithm.
 *		 This must be set to one of the pre-defined values as this is
 *		 not hardware specific. Possible values for this field can be
 *		 found via git grep "_MIN_KEY_SIZE" include/crypto/
 * @max_keysize: Maximum key size supported by the transformation. This is the
 *		 largest key length supported by this transformation algorithm.
 *		 This must be set to one of the pre-defined values as this is
 *		 not hardware specific. Possible values for this field can be
 *		 found via git grep "_MAX_KEY_SIZE" include/crypto/
 * @setkey: Set key for the transformation. This function is used to either
 *	    program a supplied key into the hardware or store the key in the
 *	    transformation context for programming it later. Note that this
 *	    function does modify the transformation context. This function can
 *	    be called multiple times during the existence of the transformation
 *	    object, so one must make sure the key is properly reprogrammed into
 *	    the hardware. This function is also responsible for checking the key
 *	    length for validity. In case a software fallback was put in place in
 *	    the @cra_init call, this function might need to use the fallback if
 *	    the algorithm doesn't support all of the key sizes.
 * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
 *	     the supplied scatterlist containing the blocks of data. The crypto
 *	     API consumer is responsible for aligning the entries of the
 *	     scatterlist properly and making sure the chunks are correctly
 *	     sized. In case a software fallback was put in place in the
 *	     @cra_init call, this function might need to use the fallback if
 *	     the algorithm doesn't support all of the key sizes. In case the
 *	     key was stored in transformation context, the key might need to be
 *	     re-programmed into the hardware in this function. This function
 *	     shall not modify the transformation context, as this function may
 *	     be called in parallel with the same transformation object.
 * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
 *	     and the conditions are exactly the same.
 * @givencrypt: Update the IV for encryption. With this function, a cipher
 *	        implementation may provide the function on how to update the IV
 *	        for encryption.
 * @givdecrypt: Update the IV for decryption. This is the reverse of
 *	        @givencrypt .
 * @geniv: The transformation implementation may use an "IV generator" provided
 *	   by the kernel crypto API. Several use cases have a predefined
 *	   approach how IVs are to be updated. For such use cases, the kernel
 *	   crypto API provides ready-to-use implementations that can be
 *	   referenced with this variable.
 * @ivsize: IV size applicable for transformation. The consumer must provide an
 *	    IV of exactly that size to perform the encrypt or decrypt operation.
 *
 * All fields except @givencrypt , @givdecrypt , @geniv and @ivsize are
 * mandatory and must be filled.
 */
struct ablkcipher_alg {
	int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct ablkcipher_request *req);
	int (*decrypt)(struct ablkcipher_request *req);
	int (*givencrypt)(struct skcipher_givcrypt_request *req);
	int (*givdecrypt)(struct skcipher_givcrypt_request *req);

	const char *geniv;

	unsigned int min_keysize;
	unsigned int max_keysize;
	unsigned int ivsize;
};

/**
 * struct blkcipher_alg - synchronous block cipher definition
 * @min_keysize: see struct ablkcipher_alg
 * @max_keysize: see struct ablkcipher_alg
 * @setkey: see struct ablkcipher_alg
 * @encrypt: see struct ablkcipher_alg
 * @decrypt: see struct ablkcipher_alg
 * @geniv: see struct ablkcipher_alg
 * @ivsize: see struct ablkcipher_alg
 *
 * All fields except @geniv and @ivsize are mandatory and must be filled.
 */
struct blkcipher_alg {
	int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes);
	int (*decrypt)(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes);

	const char *geniv;

	unsigned int min_keysize;
	unsigned int max_keysize;
	unsigned int ivsize;
};

/**
 * struct cipher_alg - single-block symmetric ciphers definition
 * @cia_min_keysize: Minimum key size supported by the transformation. This is
 *		     the smallest key length supported by this transformation
 *		     algorithm. This must be set to one of the pre-defined
 *		     values as this is not hardware specific. Possible values
 *		     for this field can be found via git grep "_MIN_KEY_SIZE"
 *		     include/crypto/
 * @cia_max_keysize: Maximum key size supported by the transformation. This is
 *		    the largest key length supported by this transformation
 *		    algorithm. This must be set to one of the pre-defined values
 *		    as this is not hardware specific. Possible values for this
 *		    field can be found via git grep "_MAX_KEY_SIZE"
 *		    include/crypto/
 * @cia_setkey: Set key for the transformation. This function is used to either
 *	        program a supplied key into the hardware or store the key in the
 *	        transformation context for programming it later. Note that this
 *	        function does modify the transformation context. This function
 *	        can be called multiple times during the existence of the
 *	        transformation object, so one must make sure the key is properly
 *	        reprogrammed into the hardware. This function is also
 *	        responsible for checking the key length for validity.
 * @cia_encrypt: Encrypt a single block. This function is used to encrypt a
 *		 single block of data, which must be @cra_blocksize big. This
 *		 always operates on a full @cra_blocksize and it is not possible
 *		 to encrypt a block of smaller size. The supplied buffers must
 *		 therefore also be at least of @cra_blocksize size. Both the
 *		 input and output buffers are always aligned to @cra_alignmask.
 *		 In case either of the input or output buffer supplied by user
 *		 of the crypto API is not aligned to @cra_alignmask, the crypto
 *		 API will re-align the buffers. The re-alignment means that a
 *		 new buffer will be allocated, the data will be copied into the
 *		 new buffer, then the processing will happen on the new buffer,
 *		 then the data will be copied back into the original buffer and
 *		 finally the new buffer will be freed. In case a software
 *		 fallback was put in place in the @cra_init call, this function
 *		 might need to use the fallback if the algorithm doesn't support
 *		 all of the key sizes. In case the key was stored in
 *		 transformation context, the key might need to be re-programmed
 *		 into the hardware in this function. This function shall not
 *		 modify the transformation context, as this function may be
 *		 called in parallel with the same transformation object.
 * @cia_decrypt: Decrypt a single block. This is a reverse counterpart to
 *		 @cia_encrypt, and the conditions are exactly the same.
 *
 * All fields are mandatory and must be filled.
 */
struct cipher_alg {
	unsigned int cia_min_keysize;
	unsigned int cia_max_keysize;
	int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
	                  unsigned int keylen);
	void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
};

struct compress_alg {
	int (*coa_compress)(struct crypto_tfm *tfm, const u8 *src,
			    unsigned int slen, u8 *dst, unsigned int *dlen);
	int (*coa_decompress)(struct crypto_tfm *tfm, const u8 *src,
			      unsigned int slen, u8 *dst, unsigned int *dlen);
};


#define cra_ablkcipher	cra_u.ablkcipher
#define cra_blkcipher	cra_u.blkcipher
#define cra_cipher	cra_u.cipher
#define cra_compress	cra_u.compress

/**
 * struct crypto_alg - definition of a cryptograpic cipher algorithm
 * @cra_flags: Flags describing this transformation. See include/linux/crypto.h
 *	       CRYPTO_ALG_* flags for the flags which go in here. Those are
 *	       used for fine-tuning the description of the transformation
 *	       algorithm.
 * @cra_blocksize: Minimum block size of this transformation. The size in bytes
 *		   of the smallest possible unit which can be transformed with
 *		   this algorithm. The users must respect this value.
 *		   In case of HASH transformation, it is possible for a smaller
 *		   block than @cra_blocksize to be passed to the crypto API for
 *		   transformation, in case of any other transformation type, an
 * 		   error will be returned upon any attempt to transform smaller
 *		   than @cra_blocksize chunks.
 * @cra_ctxsize: Size of the operational context of the transformation. This
 *		 value informs the kernel crypto API about the memory size
 *		 needed to be allocated for the transformation context.
 * @cra_alignmask: Alignment mask for the input and output data buffer. The data
 *		   buffer containing the input data for the algorithm must be
 *		   aligned to this alignment mask. The data buffer for the
 *		   output data must be aligned to this alignment mask. Note that
 *		   the Crypto API will do the re-alignment in software, but
 *		   only under special conditions and there is a performance hit.
 *		   The re-alignment happens at these occasions for different
 *		   @cra_u types: cipher -- For both input data and output data
 *		   buffer; ahash -- For output hash destination buf; shash --
 *		   For output hash destination buf.
 *		   This is needed on hardware which is flawed by design and
 *		   cannot pick data from arbitrary addresses.
 * @cra_priority: Priority of this transformation implementation. In case
 *		  multiple transformations with same @cra_name are available to
 *		  the Crypto API, the kernel will use the one with highest
 *		  @cra_priority.
 * @cra_name: Generic name (usable by multiple implementations) of the
 *	      transformation algorithm. This is the name of the transformation
 *	      itself. This field is used by the kernel when looking up the
 *	      providers of particular transformation.
 * @cra_driver_name: Unique name of the transformation provider. This is the
 *		     name of the provider of the transformation. This can be any
 *		     arbitrary value, but in the usual case, this contains the
 *		     name of the chip or provider and the name of the
 *		     transformation algorithm.
 * @cra_type: Type of the cryptographic transformation. This is a pointer to
 *	      struct crypto_type, which implements callbacks common for all
 *	      transformation types. There are multiple options:
 *	      &crypto_blkcipher_type, &crypto_ablkcipher_type,
 *	      &crypto_ahash_type, &crypto_rng_type.
 *	      This field might be empty. In that case, there are no common
 *	      callbacks. This is the case for: cipher, compress, shash.
 * @cra_u: Callbacks implementing the transformation. This is a union of
 *	   multiple structures. Depending on the type of transformation selected
 *	   by @cra_type and @cra_flags above, the associated structure must be
 *	   filled with callbacks. This field might be empty. This is the case
 *	   for ahash, shash.
 * @cra_init: Initialize the cryptographic transformation object. This function
 *	      is used to initialize the cryptographic transformation object.
 *	      This function is called only once at the instantiation time, right
 *	      after the transformation context was allocated. In case the
 *	      cryptographic hardware has some special requirements which need to
 *	      be handled by software, this function shall check for the precise
 *	      requirement of the transformation and put any software fallbacks
 *	      in place.
 * @cra_exit: Deinitialize the cryptographic transformation object. This is a
 *	      counterpart to @cra_init, used to remove various changes set in
 *	      @cra_init.
 * @cra_u.ablkcipher: Union member which contains an asynchronous block cipher
 *		      definition. See @struct @ablkcipher_alg.
 * @cra_u.blkcipher: Union member which contains a synchronous block cipher
 * 		     definition See @struct @blkcipher_alg.
 * @cra_u.cipher: Union member which contains a single-block symmetric cipher
 *		  definition. See @struct @cipher_alg.
 * @cra_u.compress: Union member which contains a (de)compression algorithm.
 *		    See @struct @compress_alg.
 * @cra_module: Owner of this transformation implementation. Set to THIS_MODULE
 * @cra_list: internally used
 * @cra_users: internally used
 * @cra_refcnt: internally used
 * @cra_destroy: internally used
 *
 * The struct crypto_alg describes a generic Crypto API algorithm and is common
 * for all of the transformations. Any variable not documented here shall not
 * be used by a cipher implementation as it is internal to the Crypto API.
 */
struct crypto_alg {
	struct list_head cra_list;
	struct list_head cra_users;

	u32 cra_flags;
	unsigned int cra_blocksize;
	unsigned int cra_ctxsize;
	unsigned int cra_alignmask;

	int cra_priority;
	refcount_t cra_refcnt;

	char cra_name[CRYPTO_MAX_ALG_NAME];
	char cra_driver_name[CRYPTO_MAX_ALG_NAME];

	const struct crypto_type *cra_type;

	union {
		struct ablkcipher_alg ablkcipher;
		struct blkcipher_alg blkcipher;
		struct cipher_alg cipher;
		struct compress_alg compress;
	} cra_u;

	int (*cra_init)(struct crypto_tfm *tfm);
	void (*cra_exit)(struct crypto_tfm *tfm);
	void (*cra_destroy)(struct crypto_alg *alg);
	
	struct module *cra_module;
} CRYPTO_MINALIGN_ATTR;

/*
 * A helper struct for waiting for completion of async crypto ops
 */
struct crypto_wait {
	struct completion completion;
	int err;
};

/*
 * Macro for declaring a crypto op async wait object on stack
 */
#define DECLARE_CRYPTO_WAIT(_wait) \
	struct crypto_wait _wait = { \
		COMPLETION_INITIALIZER_ONSTACK((_wait).completion), 0 }

/*
 * Async ops completion helper functioons
 */
void crypto_req_done(struct crypto_async_request *req, int err);

static inline int crypto_wait_req(int err, struct crypto_wait *wait)
{
	switch (err) {
	case -EINPROGRESS:
	case -EBUSY:
		wait_for_completion(&wait->completion);
		reinit_completion(&wait->completion);
		err = wait->err;
		break;
	};

	return err;
}

static inline void crypto_init_wait(struct crypto_wait *wait)
{
	init_completion(&wait->completion);
}

/*
 * Algorithm registration interface.
 */
int crypto_register_alg(struct crypto_alg *alg);
int crypto_unregister_alg(struct crypto_alg *alg);
int crypto_register_algs(struct crypto_alg *algs, int count);
int crypto_unregister_algs(struct crypto_alg *algs, int count);

/*
 * Algorithm query interface.
 */
int crypto_has_alg(const char *name, u32 type, u32 mask);

/*
 * Transforms: user-instantiated objects which encapsulate algorithms
 * and core processing logic.  Managed via crypto_alloc_*() and
 * crypto_free_*(), as well as the various helpers below.
 */

struct ablkcipher_tfm {
	int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct ablkcipher_request *req);
	int (*decrypt)(struct ablkcipher_request *req);

	struct crypto_ablkcipher *base;

	unsigned int ivsize;
	unsigned int reqsize;
};

struct blkcipher_tfm {
	void *iv;
	int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
		      unsigned int keylen);
	int (*encrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes);
	int (*decrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes);
};

struct cipher_tfm {
	int (*cit_setkey)(struct crypto_tfm *tfm,
	                  const u8 *key, unsigned int keylen);
	void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
};

struct compress_tfm {
	int (*cot_compress)(struct crypto_tfm *tfm,
	                    const u8 *src, unsigned int slen,
	                    u8 *dst, unsigned int *dlen);
	int (*cot_decompress)(struct crypto_tfm *tfm,
	                      const u8 *src, unsigned int slen,
	                      u8 *dst, unsigned int *dlen);
};

#define crt_ablkcipher	crt_u.ablkcipher
#define crt_blkcipher	crt_u.blkcipher
#define crt_cipher	crt_u.cipher
#define crt_compress	crt_u.compress

struct crypto_tfm {

	u32 crt_flags;
	
	union {
		struct ablkcipher_tfm ablkcipher;
		struct blkcipher_tfm blkcipher;
		struct cipher_tfm cipher;
		struct compress_tfm compress;
	} crt_u;

	void (*exit)(struct crypto_tfm *tfm);
	
	struct crypto_alg *__crt_alg;

	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
};

struct crypto_ablkcipher {
	struct crypto_tfm base;
};

struct crypto_blkcipher {
	struct crypto_tfm base;
};

struct crypto_cipher {
	struct crypto_tfm base;
};

struct crypto_comp {
	struct crypto_tfm base;
};

enum {
	CRYPTOA_UNSPEC,
	CRYPTOA_ALG,
	CRYPTOA_TYPE,
	CRYPTOA_U32,
	__CRYPTOA_MAX,
};

#define CRYPTOA_MAX (__CRYPTOA_MAX - 1)

/* Maximum number of (rtattr) parameters for each template. */
#define CRYPTO_MAX_ATTRS 32

struct crypto_attr_alg {
	char name[CRYPTO_MAX_ALG_NAME];
};

struct crypto_attr_type {
	u32 type;
	u32 mask;
};

struct crypto_attr_u32 {
	u32 num;
};

/* 
 * Transform user interface.
 */
 
struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);

static inline void crypto_free_tfm(struct crypto_tfm *tfm)
{
	return crypto_destroy_tfm(tfm, tfm);
}

int alg_test(const char *driver, const char *alg, u32 type, u32 mask);

/*
 * Transform helpers which query the underlying algorithm.
 */
static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_name;
}

static inline const char *crypto_tfm_alg_driver_name(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_driver_name;
}

static inline int crypto_tfm_alg_priority(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_priority;
}

static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
}

static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_blocksize;
}

static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
{
	return tfm->__crt_alg->cra_alignmask;
}

static inline u32 crypto_tfm_get_flags(struct crypto_tfm *tfm)
{
	return tfm->crt_flags;
}

static inline void crypto_tfm_set_flags(struct crypto_tfm *tfm, u32 flags)
{
	tfm->crt_flags |= flags;
}

static inline void crypto_tfm_clear_flags(struct crypto_tfm *tfm, u32 flags)
{
	tfm->crt_flags &= ~flags;
}

static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
{
	return tfm->__crt_ctx;
}

static inline unsigned int crypto_tfm_ctx_alignment(void)
{
	struct crypto_tfm *tfm;
	return __alignof__(tfm->__crt_ctx);
}

/*
 * API wrappers.
 */
static inline struct crypto_ablkcipher *__crypto_ablkcipher_cast(
	struct crypto_tfm *tfm)
{
	return (struct crypto_ablkcipher *)tfm;
}

static inline u32 crypto_skcipher_type(u32 type)
{
	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
	return type;
}

static inline u32 crypto_skcipher_mask(u32 mask)
{
	mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
	return mask;
}

/**
 * DOC: Asynchronous Block Cipher API
 *
 * Asynchronous block cipher API is used with the ciphers of type
 * CRYPTO_ALG_TYPE_ABLKCIPHER (listed as type "ablkcipher" in /proc/crypto).
 *
 * Asynchronous cipher operations imply that the function invocation for a
 * cipher request returns immediately before the completion of the operation.
 * The cipher request is scheduled as a separate kernel thread and therefore
 * load-balanced on the different CPUs via the process scheduler. To allow
 * the kernel crypto API to inform the caller about the completion of a cipher
 * request, the caller must provide a callback function. That function is
 * invoked with the cipher handle when the request completes.
 *
 * To support the asynchronous operation, additional information than just the
 * cipher handle must be supplied to the kernel crypto API. That additional
 * information is given by filling in the ablkcipher_request data structure.
 *
 * For the asynchronous block cipher API, the state is maintained with the tfm
 * cipher handle. A single tfm can be used across multiple calls and in
 * parallel. For asynchronous block cipher calls, context data supplied and
 * only used by the caller can be referenced the request data structure in
 * addition to the IV used for the cipher request. The maintenance of such
 * state information would be important for a crypto driver implementer to
 * have, because when calling the callback function upon completion of the
 * cipher operation, that callback function may need some information about
 * which operation just finished if it invoked multiple in parallel. This
 * state information is unused by the kernel crypto API.
 */

static inline struct crypto_tfm *crypto_ablkcipher_tfm(
	struct crypto_ablkcipher *tfm)
{
	return &tfm->base;
}

/**
 * crypto_free_ablkcipher() - zeroize and free cipher handle
 * @tfm: cipher handle to be freed
 */
static inline void crypto_free_ablkcipher(struct crypto_ablkcipher *tfm)
{
	crypto_free_tfm(crypto_ablkcipher_tfm(tfm));
}

/**
 * crypto_has_ablkcipher() - Search for the availability of an ablkcipher.
 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
 *	      ablkcipher
 * @type: specifies the type of the cipher
 * @mask: specifies the mask for the cipher
 *
 * Return: true when the ablkcipher is known to the kernel crypto API; false
 *	   otherwise
 */
static inline int crypto_has_ablkcipher(const char *alg_name, u32 type,
					u32 mask)
{
	return crypto_has_alg(alg_name, crypto_skcipher_type(type),
			      crypto_skcipher_mask(mask));
}

static inline struct ablkcipher_tfm *crypto_ablkcipher_crt(
	struct crypto_ablkcipher *tfm)
{
	return &crypto_ablkcipher_tfm(tfm)->crt_ablkcipher;
}

/**
 * crypto_ablkcipher_ivsize() - obtain IV size
 * @tfm: cipher handle
 *
 * The size of the IV for the ablkcipher referenced by the cipher handle is
 * returned. This IV size may be zero if the cipher does not need an IV.
 *
 * Return: IV size in bytes
 */
static inline unsigned int crypto_ablkcipher_ivsize(
	struct crypto_ablkcipher *tfm)
{
	return crypto_ablkcipher_crt(tfm)->ivsize;
}

/**
 * crypto_ablkcipher_blocksize() - obtain block size of cipher
 * @tfm: cipher handle
 *
 * The block size for the ablkcipher referenced with the cipher handle is
 * returned. The caller may use that information to allocate appropriate
 * memory for the data returned by the encryption or decryption operation
 *
 * Return: block size of cipher
 */
static inline unsigned int crypto_ablkcipher_blocksize(
	struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_alg_blocksize(crypto_ablkcipher_tfm(tfm));
}

static inline unsigned int crypto_ablkcipher_alignmask(
	struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_alg_alignmask(crypto_ablkcipher_tfm(tfm));
}

static inline u32 crypto_ablkcipher_get_flags(struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_get_flags(crypto_ablkcipher_tfm(tfm));
}

static inline void crypto_ablkcipher_set_flags(struct crypto_ablkcipher *tfm,
					       u32 flags)
{
	crypto_tfm_set_flags(crypto_ablkcipher_tfm(tfm), flags);
}

static inline void crypto_ablkcipher_clear_flags(struct crypto_ablkcipher *tfm,
						 u32 flags)
{
	crypto_tfm_clear_flags(crypto_ablkcipher_tfm(tfm), flags);
}

/**
 * crypto_ablkcipher_setkey() - set key for cipher
 * @tfm: cipher handle
 * @key: buffer holding the key
 * @keylen: length of the key in bytes
 *
 * The caller provided key is set for the ablkcipher referenced by the cipher
 * handle.
 *
 * Note, the key length determines the cipher type. Many block ciphers implement
 * different cipher modes depending on the key size, such as AES-128 vs AES-192
 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
 * is performed.
 *
 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
 */
static inline int crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
					   const u8 *key, unsigned int keylen)
{
	struct ablkcipher_tfm *crt = crypto_ablkcipher_crt(tfm);

	return crt->setkey(crt->base, key, keylen);
}

/**
 * crypto_ablkcipher_reqtfm() - obtain cipher handle from request
 * @req: ablkcipher_request out of which the cipher handle is to be obtained
 *
 * Return the crypto_ablkcipher handle when furnishing an ablkcipher_request
 * data structure.
 *
 * Return: crypto_ablkcipher handle
 */
static inline struct crypto_ablkcipher *crypto_ablkcipher_reqtfm(
	struct ablkcipher_request *req)
{
	return __crypto_ablkcipher_cast(req->base.tfm);
}

/**
 * crypto_ablkcipher_encrypt() - encrypt plaintext
 * @req: reference to the ablkcipher_request handle that holds all information
 *	 needed to perform the cipher operation
 *
 * Encrypt plaintext data using the ablkcipher_request handle. That data
 * structure and how it is filled with data is discussed with the
 * ablkcipher_request_* functions.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 */
static inline int crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
{
	struct ablkcipher_tfm *crt =
		crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
	return crt->encrypt(req);
}

/**
 * crypto_ablkcipher_decrypt() - decrypt ciphertext
 * @req: reference to the ablkcipher_request handle that holds all information
 *	 needed to perform the cipher operation
 *
 * Decrypt ciphertext data using the ablkcipher_request handle. That data
 * structure and how it is filled with data is discussed with the
 * ablkcipher_request_* functions.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 */
static inline int crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
{
	struct ablkcipher_tfm *crt =
		crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
	return crt->decrypt(req);
}

/**
 * DOC: Asynchronous Cipher Request Handle
 *
 * The ablkcipher_request data structure contains all pointers to data
 * required for the asynchronous cipher operation. This includes the cipher
 * handle (which can be used by multiple ablkcipher_request instances), pointer
 * to plaintext and ciphertext, asynchronous callback function, etc. It acts
 * as a handle to the ablkcipher_request_* API calls in a similar way as
 * ablkcipher handle to the crypto_ablkcipher_* API calls.
 */

/**
 * crypto_ablkcipher_reqsize() - obtain size of the request data structure
 * @tfm: cipher handle
 *
 * Return: number of bytes
 */
static inline unsigned int crypto_ablkcipher_reqsize(
	struct crypto_ablkcipher *tfm)
{
	return crypto_ablkcipher_crt(tfm)->reqsize;
}

/**
 * ablkcipher_request_set_tfm() - update cipher handle reference in request
 * @req: request handle to be modified
 * @tfm: cipher handle that shall be added to the request handle
 *
 * Allow the caller to replace the existing ablkcipher handle in the request
 * data structure with a different one.
 */
static inline void ablkcipher_request_set_tfm(
	struct ablkcipher_request *req, struct crypto_ablkcipher *tfm)
{
	req->base.tfm = crypto_ablkcipher_tfm(crypto_ablkcipher_crt(tfm)->base);
}

static inline struct ablkcipher_request *ablkcipher_request_cast(
	struct crypto_async_request *req)
{
	return container_of(req, struct ablkcipher_request, base);
}

/**
 * ablkcipher_request_alloc() - allocate request data structure
 * @tfm: cipher handle to be registered with the request
 * @gfp: memory allocation flag that is handed to kmalloc by the API call.
 *
 * Allocate the request data structure that must be used with the ablkcipher
 * encrypt and decrypt API calls. During the allocation, the provided ablkcipher
 * handle is registered in the request data structure.
 *
 * Return: allocated request handle in case of success, or NULL if out of memory
 */
static inline struct ablkcipher_request *ablkcipher_request_alloc(
	struct crypto_ablkcipher *tfm, gfp_t gfp)
{
	struct ablkcipher_request *req;

	req = kmalloc(sizeof(struct ablkcipher_request) +
		      crypto_ablkcipher_reqsize(tfm), gfp);

	if (likely(req))
		ablkcipher_request_set_tfm(req, tfm);

	return req;
}

/**
 * ablkcipher_request_free() - zeroize and free request data structure
 * @req: request data structure cipher handle to be freed
 */
static inline void ablkcipher_request_free(struct ablkcipher_request *req)
{
	kzfree(req);
}

/**
 * ablkcipher_request_set_callback() - set asynchronous callback function
 * @req: request handle
 * @flags: specify zero or an ORing of the flags
 *	   CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
 *	   increase the wait queue beyond the initial maximum size;
 *	   CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
 * @compl: callback function pointer to be registered with the request handle
 * @data: The data pointer refers to memory that is not used by the kernel
 *	  crypto API, but provided to the callback function for it to use. Here,
 *	  the caller can provide a reference to memory the callback function can
 *	  operate on. As the callback function is invoked asynchronously to the
 *	  related functionality, it may need to access data structures of the
 *	  related functionality which can be referenced using this pointer. The
 *	  callback function can access the memory via the "data" field in the
 *	  crypto_async_request data structure provided to the callback function.
 *
 * This function allows setting the callback function that is triggered once the
 * cipher operation completes.
 *
 * The callback function is registered with the ablkcipher_request handle and
 * must comply with the following template::
 *
 *	void callback_function(struct crypto_async_request *req, int error)
 */
static inline void ablkcipher_request_set_callback(
	struct ablkcipher_request *req,
	u32 flags, crypto_completion_t compl, void *data)
{
	req->base.complete = compl;
	req->base.data = data;
	req->base.flags = flags;
}

/**
 * ablkcipher_request_set_crypt() - set data buffers
 * @req: request handle
 * @src: source scatter / gather list
 * @dst: destination scatter / gather list
 * @nbytes: number of bytes to process from @src
 * @iv: IV for the cipher operation which must comply with the IV size defined
 *      by crypto_ablkcipher_ivsize
 *
 * This function allows setting of the source data and destination data
 * scatter / gather lists.
 *
 * For encryption, the source is treated as the plaintext and the
 * destination is the ciphertext. For a decryption operation, the use is
 * reversed - the source is the ciphertext and the destination is the plaintext.
 */
static inline void ablkcipher_request_set_crypt(
	struct ablkcipher_request *req,
	struct scatterlist *src, struct scatterlist *dst,
	unsigned int nbytes, void *iv)
{
	req->src = src;
	req->dst = dst;
	req->nbytes = nbytes;
	req->info = iv;
}

/**
 * DOC: Synchronous Block Cipher API
 *
 * The synchronous block cipher API is used with the ciphers of type
 * CRYPTO_ALG_TYPE_BLKCIPHER (listed as type "blkcipher" in /proc/crypto)
 *
 * Synchronous calls, have a context in the tfm. But since a single tfm can be
 * used in multiple calls and in parallel, this info should not be changeable
 * (unless a lock is used). This applies, for example, to the symmetric key.
 * However, the IV is changeable, so there is an iv field in blkcipher_tfm
 * structure for synchronous blkcipher api. So, its the only state info that can
 * be kept for synchronous calls without using a big lock across a tfm.
 *
 * The block cipher API allows the use of a complete cipher, i.e. a cipher
 * consisting of a template (a block chaining mode) and a single block cipher
 * primitive (e.g. AES).
 *
 * The plaintext data buffer and the ciphertext data buffer are pointed to
 * by using scatter/gather lists. The cipher operation is performed
 * on all segments of the provided scatter/gather lists.
 *
 * The kernel crypto API supports a cipher operation "in-place" which means that
 * the caller may provide the same scatter/gather list for the plaintext and
 * cipher text. After the completion of the cipher operation, the plaintext
 * data is replaced with the ciphertext data in case of an encryption and vice
 * versa for a decryption. The caller must ensure that the scatter/gather lists
 * for the output data point to sufficiently large buffers, i.e. multiples of
 * the block size of the cipher.
 */

static inline struct crypto_blkcipher *__crypto_blkcipher_cast(
	struct crypto_tfm *tfm)
{
	return (struct crypto_blkcipher *)tfm;
}

static inline struct crypto_blkcipher *crypto_blkcipher_cast(
	struct crypto_tfm *tfm)
{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_BLKCIPHER);
	return __crypto_blkcipher_cast(tfm);
}

/**
 * crypto_alloc_blkcipher() - allocate synchronous block cipher handle
 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
 *	      blkcipher cipher
 * @type: specifies the type of the cipher
 * @mask: specifies the mask for the cipher
 *
 * Allocate a cipher handle for a block cipher. The returned struct
 * crypto_blkcipher is the cipher handle that is required for any subsequent
 * API invocation for that block cipher.
 *
 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
 *	   of an error, PTR_ERR() returns the error code.
 */
static inline struct crypto_blkcipher *crypto_alloc_blkcipher(
	const char *alg_name, u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return __crypto_blkcipher_cast(crypto_alloc_base(alg_name, type, mask));
}

static inline struct crypto_tfm *crypto_blkcipher_tfm(
	struct crypto_blkcipher *tfm)
{
	return &tfm->base;
}

/**
 * crypto_free_blkcipher() - zeroize and free the block cipher handle
 * @tfm: cipher handle to be freed
 */
static inline void crypto_free_blkcipher(struct crypto_blkcipher *tfm)
{
	crypto_free_tfm(crypto_blkcipher_tfm(tfm));
}

/**
 * crypto_has_blkcipher() - Search for the availability of a block cipher
 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
 *	      block cipher
 * @type: specifies the type of the cipher
 * @mask: specifies the mask for the cipher
 *
 * Return: true when the block cipher is known to the kernel crypto API; false
 *	   otherwise
 */
static inline int crypto_has_blkcipher(const char *alg_name, u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return crypto_has_alg(alg_name, type, mask);
}

/**
 * crypto_blkcipher_name() - return the name / cra_name from the cipher handle
 * @tfm: cipher handle
 *
 * Return: The character string holding the name of the cipher
 */
static inline const char *crypto_blkcipher_name(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_alg_name(crypto_blkcipher_tfm(tfm));
}

static inline struct blkcipher_tfm *crypto_blkcipher_crt(
	struct crypto_blkcipher *tfm)
{
	return &crypto_blkcipher_tfm(tfm)->crt_blkcipher;
}

static inline struct blkcipher_alg *crypto_blkcipher_alg(
	struct crypto_blkcipher *tfm)
{
	return &crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher;
}

/**
 * crypto_blkcipher_ivsize() - obtain IV size
 * @tfm: cipher handle
 *
 * The size of the IV for the block cipher referenced by the cipher handle is
 * returned. This IV size may be zero if the cipher does not need an IV.
 *
 * Return: IV size in bytes
 */
static inline unsigned int crypto_blkcipher_ivsize(struct crypto_blkcipher *tfm)
{
	return crypto_blkcipher_alg(tfm)->ivsize;
}

/**
 * crypto_blkcipher_blocksize() - obtain block size of cipher
 * @tfm: cipher handle
 *
 * The block size for the block cipher referenced with the cipher handle is
 * returned. The caller may use that information to allocate appropriate
 * memory for the data returned by the encryption or decryption operation.
 *
 * Return: block size of cipher
 */
static inline unsigned int crypto_blkcipher_blocksize(
	struct crypto_blkcipher *tfm)
{
	return crypto_tfm_alg_blocksize(crypto_blkcipher_tfm(tfm));
}

static inline unsigned int crypto_blkcipher_alignmask(
	struct crypto_blkcipher *tfm)
{
	return crypto_tfm_alg_alignmask(crypto_blkcipher_tfm(tfm));
}

static inline u32 crypto_blkcipher_get_flags(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_get_flags(crypto_blkcipher_tfm(tfm));
}

static inline void crypto_blkcipher_set_flags(struct crypto_blkcipher *tfm,
					      u32 flags)
{
	crypto_tfm_set_flags(crypto_blkcipher_tfm(tfm), flags);
}

static inline void crypto_blkcipher_clear_flags(struct crypto_blkcipher *tfm,
						u32 flags)
{
	crypto_tfm_clear_flags(crypto_blkcipher_tfm(tfm), flags);
}

/**
 * crypto_blkcipher_setkey() - set key for cipher
 * @tfm: cipher handle
 * @key: buffer holding the key
 * @keylen: length of the key in bytes
 *
 * The caller provided key is set for the block cipher referenced by the cipher
 * handle.
 *
 * Note, the key length determines the cipher type. Many block ciphers implement
 * different cipher modes depending on the key size, such as AES-128 vs AES-192
 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
 * is performed.
 *
 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
 */
static inline int crypto_blkcipher_setkey(struct crypto_blkcipher *tfm,
					  const u8 *key, unsigned int keylen)
{
	return crypto_blkcipher_crt(tfm)->setkey(crypto_blkcipher_tfm(tfm),
						 key, keylen);
}

/**
 * crypto_blkcipher_encrypt() - encrypt plaintext
 * @desc: reference to the block cipher handle with meta data
 * @dst: scatter/gather list that is filled by the cipher operation with the
 *	ciphertext
 * @src: scatter/gather list that holds the plaintext
 * @nbytes: number of bytes of the plaintext to encrypt.
 *
 * Encrypt plaintext data using the IV set by the caller with a preceding
 * call of crypto_blkcipher_set_iv.
 *
 * The blkcipher_desc data structure must be filled by the caller and can
 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
 * with the block cipher handle; desc.flags is filled with either
 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 */
static inline int crypto_blkcipher_encrypt(struct blkcipher_desc *desc,
					   struct scatterlist *dst,
					   struct scatterlist *src,
					   unsigned int nbytes)
{
	desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
	return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
}

/**
 * crypto_blkcipher_encrypt_iv() - encrypt plaintext with dedicated IV
 * @desc: reference to the block cipher handle with meta data
 * @dst: scatter/gather list that is filled by the cipher operation with the
 *	ciphertext
 * @src: scatter/gather list that holds the plaintext
 * @nbytes: number of bytes of the plaintext to encrypt.
 *
 * Encrypt plaintext data with the use of an IV that is solely used for this
 * cipher operation. Any previously set IV is not used.
 *
 * The blkcipher_desc data structure must be filled by the caller and can
 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
 * with the block cipher handle; desc.info is filled with the IV to be used for
 * the current operation; desc.flags is filled with either
 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 */
static inline int crypto_blkcipher_encrypt_iv(struct blkcipher_desc *desc,
					      struct scatterlist *dst,
					      struct scatterlist *src,
					      unsigned int nbytes)
{
	return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
}

/**
 * crypto_blkcipher_decrypt() - decrypt ciphertext
 * @desc: reference to the block cipher handle with meta data
 * @dst: scatter/gather list that is filled by the cipher operation with the
 *	plaintext
 * @src: scatter/gather list that holds the ciphertext
 * @nbytes: number of bytes of the ciphertext to decrypt.
 *
 * Decrypt ciphertext data using the IV set by the caller with a preceding
 * call of crypto_blkcipher_set_iv.
 *
 * The blkcipher_desc data structure must be filled by the caller as documented
 * for the crypto_blkcipher_encrypt call above.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 *
 */
static inline int crypto_blkcipher_decrypt(struct blkcipher_desc *desc,
					   struct scatterlist *dst,
					   struct scatterlist *src,
					   unsigned int nbytes)
{
	desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
	return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
}

/**
 * crypto_blkcipher_decrypt_iv() - decrypt ciphertext with dedicated IV
 * @desc: reference to the block cipher handle with meta data
 * @dst: scatter/gather list that is filled by the cipher operation with the
 *	plaintext
 * @src: scatter/gather list that holds the ciphertext
 * @nbytes: number of bytes of the ciphertext to decrypt.
 *
 * Decrypt ciphertext data with the use of an IV that is solely used for this
 * cipher operation. Any previously set IV is not used.
 *
 * The blkcipher_desc data structure must be filled by the caller as documented
 * for the crypto_blkcipher_encrypt_iv call above.
 *
 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
 */
static inline int crypto_blkcipher_decrypt_iv(struct blkcipher_desc *desc,
					      struct scatterlist *dst,
					      struct scatterlist *src,
					      unsigned int nbytes)
{
	return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
}

/**
 * crypto_blkcipher_set_iv() - set IV for cipher
 * @tfm: cipher handle
 * @src: buffer holding the IV
 * @len: length of the IV in bytes
 *
 * The caller provided IV is set for the block cipher referenced by the cipher
 * handle.
 */
static inline void crypto_blkcipher_set_iv(struct crypto_blkcipher *tfm,
					   const u8 *src, unsigned int len)
{
	memcpy(crypto_blkcipher_crt(tfm)->iv, src, len);
}

/**
 * crypto_blkcipher_get_iv() - obtain IV from cipher
 * @tfm: cipher handle
 * @dst: buffer filled with the IV
 * @len: length of the buffer dst
 *
 * The caller can obtain the IV set for the block cipher referenced by the
 * cipher handle and store it into the user-provided buffer. If the buffer
 * has an insufficient space, the IV is truncated to fit the buffer.
 */
static inline void crypto_blkcipher_get_iv(struct crypto_blkcipher *tfm,
					   u8 *dst, unsigned int len)
{
	memcpy(dst, crypto_blkcipher_crt(tfm)->iv, len);
}

/**
 * DOC: Single Block Cipher API
 *
 * The single block cipher API is used with the ciphers of type
 * CRYPTO_ALG_TYPE_CIPHER (listed as type "cipher" in /proc/crypto).
 *
 * Using the single block cipher API calls, operations with the basic cipher
 * primitive can be implemented. These cipher primitives exclude any block
 * chaining operations including IV handling.
 *
 * The purpose of this single block cipher API is to support the implementation
 * of templates or other concepts that only need to perform the cipher operation
 * on one block at a time. Templates invoke the underlying cipher primitive
 * block-wise and process either the input or the output data of these cipher
 * operations.
 */

static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
{
	return (struct crypto_cipher *)tfm;
}

static inline struct crypto_cipher *crypto_cipher_cast(struct crypto_tfm *tfm)
{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return __crypto_cipher_cast(tfm);
}

/**
 * crypto_alloc_cipher() - allocate single block cipher handle
 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
 *	     single block cipher
 * @type: specifies the type of the cipher
 * @mask: specifies the mask for the cipher
 *
 * Allocate a cipher handle for a single block cipher. The returned struct
 * crypto_cipher is the cipher handle that is required for any subsequent API
 * invocation for that single block cipher.
 *
 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
 *	   of an error, PTR_ERR() returns the error code.
 */
static inline struct crypto_cipher *crypto_alloc_cipher(const char *alg_name,
							u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_CIPHER;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return __crypto_cipher_cast(crypto_alloc_base(alg_name, type, mask));
}

static inline struct crypto_tfm *crypto_cipher_tfm(struct crypto_cipher *tfm)
{
	return &tfm->base;
}

/**
 * crypto_free_cipher() - zeroize and free the single block cipher handle
 * @tfm: cipher handle to be freed
 */
static inline void crypto_free_cipher(struct crypto_cipher *tfm)
{
	crypto_free_tfm(crypto_cipher_tfm(tfm));
}

/**
 * crypto_has_cipher() - Search for the availability of a single block cipher
 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
 *	     single block cipher
 * @type: specifies the type of the cipher
 * @mask: specifies the mask for the cipher
 *
 * Return: true when the single block cipher is known to the kernel crypto API;
 *	   false otherwise
 */
static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_CIPHER;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return crypto_has_alg(alg_name, type, mask);
}

static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
{
	return &crypto_cipher_tfm(tfm)->crt_cipher;
}

/**
 * crypto_cipher_blocksize() - obtain block size for cipher
 * @tfm: cipher handle
 *
 * The block size for the single block cipher referenced with the cipher handle
 * tfm is returned. The caller may use that information to allocate appropriate
 * memory for the data returned by the encryption or decryption operation
 *
 * Return: block size of cipher
 */
static inline unsigned int crypto_cipher_blocksize(struct crypto_cipher *tfm)
{
	return crypto_tfm_alg_blocksize(crypto_cipher_tfm(tfm));
}

static inline unsigned int crypto_cipher_alignmask(struct crypto_cipher *tfm)
{
	return crypto_tfm_alg_alignmask(crypto_cipher_tfm(tfm));
}

static inline u32 crypto_cipher_get_flags(struct crypto_cipher *tfm)
{
	return crypto_tfm_get_flags(crypto_cipher_tfm(tfm));
}

static inline void crypto_cipher_set_flags(struct crypto_cipher *tfm,
					   u32 flags)
{
	crypto_tfm_set_flags(crypto_cipher_tfm(tfm), flags);
}

static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
					     u32 flags)
{
	crypto_tfm_clear_flags(crypto_cipher_tfm(tfm), flags);
}

/**
 * crypto_cipher_setkey() - set key for cipher
 * @tfm: cipher handle
 * @key: buffer holding the key
 * @keylen: length of the key in bytes
 *
 * The caller provided key is set for the single block cipher referenced by the
 * cipher handle.
 *
 * Note, the key length determines the cipher type. Many block ciphers implement
 * different cipher modes depending on the key size, such as AES-128 vs AES-192
 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
 * is performed.
 *
 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
 */
static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
                                       const u8 *key, unsigned int keylen)
{
	return crypto_cipher_crt(tfm)->cit_setkey(crypto_cipher_tfm(tfm),
						  key, keylen);
}

/**
 * crypto_cipher_encrypt_one() - encrypt one block of plaintext
 * @tfm: cipher handle
 * @dst: points to the buffer that will be filled with the ciphertext
 * @src: buffer holding the plaintext to be encrypted
 *
 * Invoke the encryption operation of one block. The caller must ensure that
 * the plaintext and ciphertext buffers are at least one block in size.
 */
static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
					     u8 *dst, const u8 *src)
{
	crypto_cipher_crt(tfm)->cit_encrypt_one(crypto_cipher_tfm(tfm),
						dst, src);
}

/**
 * crypto_cipher_decrypt_one() - decrypt one block of ciphertext
 * @tfm: cipher handle
 * @dst: points to the buffer that will be filled with the plaintext
 * @src: buffer holding the ciphertext to be decrypted
 *
 * Invoke the decryption operation of one block. The caller must ensure that
 * the plaintext and ciphertext buffers are at least one block in size.
 */
static inline void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
					     u8 *dst, const u8 *src)
{
	crypto_cipher_crt(tfm)->cit_decrypt_one(crypto_cipher_tfm(tfm),
						dst, src);
}

static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
{
	return (struct crypto_comp *)tfm;
}

static inline struct crypto_comp *crypto_comp_cast(struct crypto_tfm *tfm)
{
	BUG_ON((crypto_tfm_alg_type(tfm) ^ CRYPTO_ALG_TYPE_COMPRESS) &
	       CRYPTO_ALG_TYPE_MASK);
	return __crypto_comp_cast(tfm);
}

static inline struct crypto_comp *crypto_alloc_comp(const char *alg_name,
						    u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_COMPRESS;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return __crypto_comp_cast(crypto_alloc_base(alg_name, type, mask));
}

static inline struct crypto_tfm *crypto_comp_tfm(struct crypto_comp *tfm)
{
	return &tfm->base;
}

static inline void crypto_free_comp(struct crypto_comp *tfm)
{
	crypto_free_tfm(crypto_comp_tfm(tfm));
}

static inline int crypto_has_comp(const char *alg_name, u32 type, u32 mask)
{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type |= CRYPTO_ALG_TYPE_COMPRESS;
	mask |= CRYPTO_ALG_TYPE_MASK;

	return crypto_has_alg(alg_name, type, mask);
}

static inline const char *crypto_comp_name(struct crypto_comp *tfm)
{
	return crypto_tfm_alg_name(crypto_comp_tfm(tfm));
}

static inline struct compress_tfm *crypto_comp_crt(struct crypto_comp *tfm)
{
	return &crypto_comp_tfm(tfm)->crt_compress;
}

static inline int crypto_comp_compress(struct crypto_comp *tfm,
                                       const u8 *src, unsigned int slen,
                                       u8 *dst, unsigned int *dlen)
{
	return crypto_comp_crt(tfm)->cot_compress(crypto_comp_tfm(tfm),
						  src, slen, dst, dlen);
}

static inline int crypto_comp_decompress(struct crypto_comp *tfm,
                                         const u8 *src, unsigned int slen,
                                         u8 *dst, unsigned int *dlen)
{
	return crypto_comp_crt(tfm)->cot_decompress(crypto_comp_tfm(tfm),
						    src, slen, dst, dlen);
}

#endif	/* _LINUX_CRYPTO_H */