aboutsummaryrefslogtreecommitdiffstats
path: root/include/openssl/ec.h
blob: 44cc139966ef1e7e0016a257de28efdefce6cb65 (plain) (blame)
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
/*
 * Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef HEADER_EC_H
# define HEADER_EC_H

# include <openssl/opensslconf.h>

# ifndef OPENSSL_NO_EC
# include <openssl/asn1.h>
# include <openssl/symhacks.h>
# if OPENSSL_API_COMPAT < 0x10100000L
#  include <openssl/bn.h>
# endif
# include <openssl/ecerr.h>
# ifdef  __cplusplus
extern "C" {
# endif

# ifndef OPENSSL_ECC_MAX_FIELD_BITS
#  define OPENSSL_ECC_MAX_FIELD_BITS 661
# endif

/** Enum for the point conversion form as defined in X9.62 (ECDSA)
 *  for the encoding of a elliptic curve point (x,y) */
typedef enum {
        /** the point is encoded as z||x, where the octet z specifies
         *  which solution of the quadratic equation y is  */
    POINT_CONVERSION_COMPRESSED = 2,
        /** the point is encoded as z||x||y, where z is the octet 0x04  */
    POINT_CONVERSION_UNCOMPRESSED = 4,
        /** the point is encoded as z||x||y, where the octet z specifies
         *  which solution of the quadratic equation y is  */
    POINT_CONVERSION_HYBRID = 6
} point_conversion_form_t;

typedef struct ec_method_st EC_METHOD;
typedef struct ec_group_st EC_GROUP;
typedef struct ec_point_st EC_POINT;
typedef struct ecpk_parameters_st ECPKPARAMETERS;
typedef struct ec_parameters_st ECPARAMETERS;

/********************************************************************/
/*               EC_METHODs for curves over GF(p)                   */
/********************************************************************/

/** Returns the basic GFp ec methods which provides the basis for the
 *  optimized methods.
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_simple_method(void);

/** Returns GFp methods using montgomery multiplication.
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_mont_method(void);

/** Returns GFp methods using optimized methods for NIST recommended curves
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nist_method(void);

# ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
/** Returns 64-bit optimized methods for nistp224
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nistp224_method(void);

/** Returns 64-bit optimized methods for nistp256
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nistp256_method(void);

/** Returns 64-bit optimized methods for nistp521
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nistp521_method(void);
# endif

# ifndef OPENSSL_NO_EC2M
/********************************************************************/
/*           EC_METHOD for curves over GF(2^m)                      */
/********************************************************************/

/** Returns the basic GF2m ec method
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GF2m_simple_method(void);

# endif

/********************************************************************/
/*                   EC_GROUP functions                             */
/********************************************************************/

/** Creates a new EC_GROUP object
 *  \param   meth  EC_METHOD to use
 *  \return  newly created EC_GROUP object or NULL in case of an error.
 */
EC_GROUP *EC_GROUP_new(const EC_METHOD *meth);

/** Frees a EC_GROUP object
 *  \param  group  EC_GROUP object to be freed.
 */
void EC_GROUP_free(EC_GROUP *group);

/** Clears and frees a EC_GROUP object
 *  \param  group  EC_GROUP object to be cleared and freed.
 */
void EC_GROUP_clear_free(EC_GROUP *group);

/** Copies EC_GROUP objects. Note: both EC_GROUPs must use the same EC_METHOD.
 *  \param  dst  destination EC_GROUP object
 *  \param  src  source EC_GROUP object
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_GROUP_copy(EC_GROUP *dst, const EC_GROUP *src);

/** Creates a new EC_GROUP object and copies the copies the content
 *  form src to the newly created EC_KEY object
 *  \param  src  source EC_GROUP object
 *  \return newly created EC_GROUP object or NULL in case of an error.
 */
EC_GROUP *EC_GROUP_dup(const EC_GROUP *src);

/** Returns the EC_METHOD of the EC_GROUP object.
 *  \param  group  EC_GROUP object
 *  \return EC_METHOD used in this EC_GROUP object.
 */
const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group);

/** Returns the field type of the EC_METHOD.
 *  \param  meth  EC_METHOD object
 *  \return NID of the underlying field type OID.
 */
int EC_METHOD_get_field_type(const EC_METHOD *meth);

/** Sets the generator and its order/cofactor of a EC_GROUP object.
 *  \param  group      EC_GROUP object
 *  \param  generator  EC_POINT object with the generator.
 *  \param  order      the order of the group generated by the generator.
 *  \param  cofactor   the index of the sub-group generated by the generator
 *                     in the group of all points on the elliptic curve.
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
                           const BIGNUM *order, const BIGNUM *cofactor);

/** Returns the generator of a EC_GROUP object.
 *  \param  group  EC_GROUP object
 *  \return the currently used generator (possibly NULL).
 */
const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);

/** Returns the montgomery data for order(Generator)
 *  \param  group  EC_GROUP object
 *  \return the currently used montgomery data (possibly NULL).
*/
BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group);

/** Gets the order of a EC_GROUP
 *  \param  group  EC_GROUP object
 *  \param  order  BIGNUM to which the order is copied
 *  \param  ctx    unused
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx);

/** Gets the order of an EC_GROUP
 *  \param  group  EC_GROUP object
 *  \return the group order
 */
const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);

/** Gets the number of bits of the order of an EC_GROUP
 *  \param  group  EC_GROUP object
 *  \return number of bits of group order.
 */
int EC_GROUP_order_bits(const EC_GROUP *group);

/** Gets the cofactor of a EC_GROUP
 *  \param  group     EC_GROUP object
 *  \param  cofactor  BIGNUM to which the cofactor is copied
 *  \param  ctx       unused
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
                          BN_CTX *ctx);

/** Gets the cofactor of an EC_GROUP
 *  \param  group  EC_GROUP object
 *  \return the group cofactor
 */
const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);

/** Sets the name of a EC_GROUP object
 *  \param  group  EC_GROUP object
 *  \param  nid    NID of the curve name OID
 */
void EC_GROUP_set_curve_name(EC_GROUP *group, int nid);

/** Returns the curve name of a EC_GROUP object
 *  \param  group  EC_GROUP object
 *  \return NID of the curve name OID or 0 if not set.
 */
int EC_GROUP_get_curve_name(const EC_GROUP *group);

void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag);
int EC_GROUP_get_asn1_flag(const EC_GROUP *group);

void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
                                        point_conversion_form_t form);
point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *);

unsigned char *EC_GROUP_get0_seed(const EC_GROUP *x);
size_t EC_GROUP_get_seed_len(const EC_GROUP *);
size_t EC_GROUP_set_seed(EC_GROUP *, const unsigned char *, size_t len);

/** Sets the parameters of a ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM with parameter a of the equation
 *  \param  b      BIGNUM with parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
                       const BIGNUM *b, BN_CTX *ctx);

/** Gets the parameters of the ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM for parameter a of the equation
 *  \param  b      BIGNUM for parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
                       BN_CTX *ctx);

/** Sets the parameters of an ec curve. Synonym for EC_GROUP_set_curve
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM with parameter a of the equation
 *  \param  b      BIGNUM with parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p,
                                              const BIGNUM *a, const BIGNUM *b,
                                              BN_CTX *ctx))

/** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM for parameter a of the equation
 *  \param  b      BIGNUM for parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p,
                                              BIGNUM *a, BIGNUM *b,
                                              BN_CTX *ctx))

# ifndef OPENSSL_NO_EC2M
/** Sets the parameter of an ec curve. Synonym for EC_GROUP_set_curve
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM with parameter a of the equation
 *  \param  b      BIGNUM with parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p,
                                               const BIGNUM *a, const BIGNUM *b,
                                               BN_CTX *ctx))

/** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 *  \param  group  EC_GROUP object
 *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 *                 defining the underlying field (GF2m)
 *  \param  a      BIGNUM for parameter a of the equation
 *  \param  b      BIGNUM for parameter b of the equation
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p,
                                               BIGNUM *a, BIGNUM *b,
                                               BN_CTX *ctx))
# endif
/** Returns the number of bits needed to represent a field element
 *  \param  group  EC_GROUP object
 *  \return number of bits needed to represent a field element
 */
int EC_GROUP_get_degree(const EC_GROUP *group);

/** Checks whether the parameter in the EC_GROUP define a valid ec group
 *  \param  group  EC_GROUP object
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 if group is a valid ec group and 0 otherwise
 */
int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);

/** Checks whether the discriminant of the elliptic curve is zero or not
 *  \param  group  EC_GROUP object
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 if the discriminant is not zero and 0 otherwise
 */
int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx);

/** Compares two EC_GROUP objects
 *  \param  a    first EC_GROUP object
 *  \param  b    second EC_GROUP object
 *  \param  ctx  BN_CTX object (optional)
 *  \return 0 if the groups are equal, 1 if not, or -1 on error
 */
int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx);

/*
 * EC_GROUP_new_GF*() calls EC_GROUP_new() and EC_GROUP_set_GF*() after
 * choosing an appropriate EC_METHOD
 */

/** Creates a new EC_GROUP object with the specified parameters defined
 *  over GFp (defined by the equation y^2 = x^3 + a*x + b)
 *  \param  p    BIGNUM with the prime number
 *  \param  a    BIGNUM with the parameter a of the equation
 *  \param  b    BIGNUM with the parameter b of the equation
 *  \param  ctx  BN_CTX object (optional)
 *  \return newly created EC_GROUP object with the specified parameters
 */
EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a,
                                 const BIGNUM *b, BN_CTX *ctx);
# ifndef OPENSSL_NO_EC2M
/** Creates a new EC_GROUP object with the specified parameters defined
 *  over GF2m (defined by the equation y^2 + x*y = x^3 + a*x^2 + b)
 *  \param  p    BIGNUM with the polynomial defining the underlying field
 *  \param  a    BIGNUM with the parameter a of the equation
 *  \param  b    BIGNUM with the parameter b of the equation
 *  \param  ctx  BN_CTX object (optional)
 *  \return newly created EC_GROUP object with the specified parameters
 */
EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a,
                                  const BIGNUM *b, BN_CTX *ctx);
# endif

/** Creates a EC_GROUP object with a curve specified by a NID
 *  \param  nid  NID of the OID of the curve name
 *  \return newly created EC_GROUP object with specified curve or NULL
 *          if an error occurred
 */
EC_GROUP *EC_GROUP_new_by_curve_name(int nid);

/** Creates a new EC_GROUP object from an ECPARAMETERS object
 *  \param  params  pointer to the ECPARAMETERS object
 *  \return newly created EC_GROUP object with specified curve or NULL
 *          if an error occurred
 */
EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params);

/** Creates an ECPARAMETERS object for the given EC_GROUP object.
 *  \param  group   pointer to the EC_GROUP object
 *  \param  params  pointer to an existing ECPARAMETERS object or NULL
 *  \return pointer to the new ECPARAMETERS object or NULL
 *          if an error occurred.
 */
ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
                                        ECPARAMETERS *params);

/** Creates a new EC_GROUP object from an ECPKPARAMETERS object
 *  \param  params  pointer to an existing ECPKPARAMETERS object, or NULL
 *  \return newly created EC_GROUP object with specified curve, or NULL
 *          if an error occurred
 */
EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params);

/** Creates an ECPKPARAMETERS object for the given EC_GROUP object.
 *  \param  group   pointer to the EC_GROUP object
 *  \param  params  pointer to an existing ECPKPARAMETERS object or NULL
 *  \return pointer to the new ECPKPARAMETERS object or NULL
 *          if an error occurred.
 */
ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
                                            ECPKPARAMETERS *params);

/********************************************************************/
/*               handling of internal curves                        */
/********************************************************************/

typedef struct {
    int nid;
    const char *comment;
} EC_builtin_curve;

/*
 * EC_builtin_curves(EC_builtin_curve *r, size_t size) returns number of all
 * available curves or zero if a error occurred. In case r is not zero,
 * nitems EC_builtin_curve structures are filled with the data of the first
 * nitems internal groups
 */
size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);

const char *EC_curve_nid2nist(int nid);
int EC_curve_nist2nid(const char *name);

/********************************************************************/
/*                    EC_POINT functions                            */
/********************************************************************/

/** Creates a new EC_POINT object for the specified EC_GROUP
 *  \param  group  EC_GROUP the underlying EC_GROUP object
 *  \return newly created EC_POINT object or NULL if an error occurred
 */
EC_POINT *EC_POINT_new(const EC_GROUP *group);

/** Frees a EC_POINT object
 *  \param  point  EC_POINT object to be freed
 */
void EC_POINT_free(EC_POINT *point);

/** Clears and frees a EC_POINT object
 *  \param  point  EC_POINT object to be cleared and freed
 */
void EC_POINT_clear_free(EC_POINT *point);

/** Copies EC_POINT object
 *  \param  dst  destination EC_POINT object
 *  \param  src  source EC_POINT object
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);

/** Creates a new EC_POINT object and copies the content of the supplied
 *  EC_POINT
 *  \param  src    source EC_POINT object
 *  \param  group  underlying the EC_GROUP object
 *  \return newly created EC_POINT object or NULL if an error occurred
 */
EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);

/** Returns the EC_METHOD used in EC_POINT object
 *  \param  point  EC_POINT object
 *  \return the EC_METHOD used
 */
const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);

/** Sets a point to infinity (neutral element)
 *  \param  group  underlying EC_GROUP object
 *  \param  point  EC_POINT to set to infinity
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);

/** Sets the jacobian projective coordinates of a EC_POINT over GFp
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with the x-coordinate
 *  \param  y      BIGNUM with the y-coordinate
 *  \param  z      BIGNUM with the z-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
                                             EC_POINT *p, const BIGNUM *x,
                                             const BIGNUM *y, const BIGNUM *z,
                                             BN_CTX *ctx);

/** Gets the jacobian projective coordinates of a EC_POINT over GFp
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM for the x-coordinate
 *  \param  y      BIGNUM for the y-coordinate
 *  \param  z      BIGNUM for the z-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
                                             const EC_POINT *p, BIGNUM *x,
                                             BIGNUM *y, BIGNUM *z,
                                             BN_CTX *ctx);

/** Sets the affine coordinates of an EC_POINT
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with the x-coordinate
 *  \param  y      BIGNUM with the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
                                    const BIGNUM *x, const BIGNUM *y,
                                    BN_CTX *ctx);

/** Gets the affine coordinates of an EC_POINT.
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM for the x-coordinate
 *  \param  y      BIGNUM for the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
                                    BIGNUM *x, BIGNUM *y, BN_CTX *ctx);

/** Sets the affine coordinates of an EC_POINT. A synonym of
 *  EC_POINT_set_affine_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with the x-coordinate
 *  \param  y      BIGNUM with the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
                                                           EC_POINT *p,
                                                           const BIGNUM *x,
                                                           const BIGNUM *y,
                                                           BN_CTX *ctx))

/** Gets the affine coordinates of an EC_POINT. A synonym of
 *  EC_POINT_get_affine_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM for the x-coordinate
 *  \param  y      BIGNUM for the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
                                                           const EC_POINT *p,
                                                           BIGNUM *x,
                                                           BIGNUM *y,
                                                           BN_CTX *ctx))

/** Sets the x9.62 compressed coordinates of a EC_POINT
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with x-coordinate
 *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
                                        const BIGNUM *x, int y_bit,
                                        BN_CTX *ctx);

/** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 *  EC_POINT_set_compressed_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with x-coordinate
 *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
                                                               EC_POINT *p,
                                                               const BIGNUM *x,
                                                               int y_bit,
                                                               BN_CTX *ctx))
# ifndef OPENSSL_NO_EC2M
/** Sets the affine coordinates of an EC_POINT. A synonym of
 *  EC_POINT_set_affine_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with the x-coordinate
 *  \param  y      BIGNUM with the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
                                                            EC_POINT *p,
                                                            const BIGNUM *x,
                                                            const BIGNUM *y,
                                                            BN_CTX *ctx))

/** Gets the affine coordinates of an EC_POINT. A synonym of
 *  EC_POINT_get_affine_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM for the x-coordinate
 *  \param  y      BIGNUM for the y-coordinate
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
                                                            const EC_POINT *p,
                                                            BIGNUM *x,
                                                            BIGNUM *y,
                                                            BN_CTX *ctx))

/** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 *  EC_POINT_set_compressed_coordinates
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  x      BIGNUM with x-coordinate
 *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
DEPRECATEDIN_1_2_0(int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
                                                                EC_POINT *p,
                                                                const BIGNUM *x,
                                                                int y_bit,
                                                                BN_CTX *ctx))
# endif
/** Encodes a EC_POINT object to a octet string
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  form   point conversion form
 *  \param  buf    memory buffer for the result. If NULL the function returns
 *                 required buffer size.
 *  \param  len    length of the memory buffer
 *  \param  ctx    BN_CTX object (optional)
 *  \return the length of the encoded octet string or 0 if an error occurred
 */
size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
                          point_conversion_form_t form,
                          unsigned char *buf, size_t len, BN_CTX *ctx);

/** Decodes a EC_POINT from a octet string
 *  \param  group  underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \param  buf    memory buffer with the encoded ec point
 *  \param  len    length of the encoded ec point
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
                       const unsigned char *buf, size_t len, BN_CTX *ctx);

/** Encodes an EC_POINT object to an allocated octet string
 *  \param  group  underlying EC_GROUP object
 *  \param  point  EC_POINT object
 *  \param  form   point conversion form
 *  \param  pbuf   returns pointer to allocated buffer
 *  \param  ctx    BN_CTX object (optional)
 *  \return the length of the encoded octet string or 0 if an error occurred
 */
size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
                          point_conversion_form_t form,
                          unsigned char **pbuf, BN_CTX *ctx);

/* other interfaces to point2oct/oct2point: */
BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
                          point_conversion_form_t form, BIGNUM *, BN_CTX *);
EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
                            EC_POINT *, BN_CTX *);
char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
                         point_conversion_form_t form, BN_CTX *);
EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
                             EC_POINT *, BN_CTX *);

/********************************************************************/
/*         functions for doing EC_POINT arithmetic                  */
/********************************************************************/

/** Computes the sum of two EC_POINT
 *  \param  group  underlying EC_GROUP object
 *  \param  r      EC_POINT object for the result (r = a + b)
 *  \param  a      EC_POINT object with the first summand
 *  \param  b      EC_POINT object with the second summand
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
                 const EC_POINT *b, BN_CTX *ctx);

/** Computes the double of a EC_POINT
 *  \param  group  underlying EC_GROUP object
 *  \param  r      EC_POINT object for the result (r = 2 * a)
 *  \param  a      EC_POINT object
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
                 BN_CTX *ctx);

/** Computes the inverse of a EC_POINT
 *  \param  group  underlying EC_GROUP object
 *  \param  a      EC_POINT object to be inverted (it's used for the result as well)
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx);

/** Checks whether the point is the neutral element of the group
 *  \param  group  the underlying EC_GROUP object
 *  \param  p      EC_POINT object
 *  \return 1 if the point is the neutral element and 0 otherwise
 */
int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p);

/** Checks whether the point is on the curve
 *  \param  group  underlying EC_GROUP object
 *  \param  point  EC_POINT object to check
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 if the point is on the curve, 0 if not, or -1 on error
 */
int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
                         BN_CTX *ctx);

/** Compares two EC_POINTs
 *  \param  group  underlying EC_GROUP object
 *  \param  a      first EC_POINT object
 *  \param  b      second EC_POINT object
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 if the points are not equal, 0 if they are, or -1 on error
 */
int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
                 BN_CTX *ctx);

int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx);
int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
                          EC_POINT *points[], BN_CTX *ctx);

/** Computes r = generator * n + sum_{i=0}^{num-1} p[i] * m[i]
 *  \param  group  underlying EC_GROUP object
 *  \param  r      EC_POINT object for the result
 *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 *  \param  num    number further summands
 *  \param  p      array of size num of EC_POINT objects
 *  \param  m      array of size num of BIGNUM objects
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
                  size_t num, const EC_POINT *p[], const BIGNUM *m[],
                  BN_CTX *ctx);

/** Computes r = generator * n + q * m
 *  \param  group  underlying EC_GROUP object
 *  \param  r      EC_POINT object for the result
 *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 *  \param  q      EC_POINT object with the first factor of the second summand
 *  \param  m      BIGNUM with the second factor of the second summand
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
                 const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);

/** Stores multiples of generator for faster point multiplication
 *  \param  group  EC_GROUP object
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */
int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx);

/** Reports whether a precomputation has been done
 *  \param  group  EC_GROUP object
 *  \return 1 if a pre-computation has been done and 0 otherwise
 */
int EC_GROUP_have_precompute_mult(const EC_GROUP *group);

/********************************************************************/
/*                       ASN1 stuff                                 */
/********************************************************************/

DECLARE_ASN1_ITEM(ECPKPARAMETERS)
DECLARE_ASN1_ALLOC_FUNCTIONS(ECPKPARAMETERS)
DECLARE_ASN1_ITEM(ECPARAMETERS)
DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)

/*
 * EC_GROUP_get_basis_type() returns the NID of the basis type used to
 * represent the field elements
 */
int EC_GROUP_get_basis_type(const EC_GROUP *);
# ifndef OPENSSL_NO_EC2M
int EC_GROUP_get_trinomial_basis(const EC_GROUP *, unsigned int *k);
int EC_GROUP_get_pentanomial_basis(const EC_GROUP *, unsigned int *k1,
                                   unsigned int *k2, unsigned int *k3);
# endif

# define OPENSSL_EC_EXPLICIT_CURVE  0x000
# define OPENSSL_EC_NAMED_CURVE     0x001

EC_GROUP *d2i_ECPKParameters(EC_GROUP **, const unsigned char **in, long len);
int i2d_ECPKParameters(const EC_GROUP *, unsigned char **out);

# define d2i_ECPKParameters_bio(bp,x) ASN1_d2i_bio_of(EC_GROUP,NULL,d2i_ECPKParameters,bp,x)
# define i2d_ECPKParameters_bio(bp,x) ASN1_i2d_bio_of_const(EC_GROUP,i2d_ECPKParameters,bp,x)
# define d2i_ECPKParameters_fp(fp,x) (EC_GROUP *)ASN1_d2i_fp(NULL, \
                (char *(*)())d2i_ECPKParameters,(fp),(unsigned char **)(x))
# define i2d_ECPKParameters_fp(fp,x) ASN1_i2d_fp(i2d_ECPKParameters,(fp), \
                (unsigned char *)(x))

int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
# ifndef OPENSSL_NO_STDIO
int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
# endif

/********************************************************************/
/*                      EC_KEY functions                            */
/********************************************************************/

/* some values for the encoding_flag */
# define EC_PKEY_NO_PARAMETERS   0x001
# define EC_PKEY_NO_PUBKEY       0x002

/* some values for the flags field */
# define EC_FLAG_NON_FIPS_ALLOW  0x1
# define EC_FLAG_FIPS_CHECKED    0x2
# define EC_FLAG_COFACTOR_ECDH   0x1000

/** Creates a new EC_KEY object.
 *  \return EC_KEY object or NULL if an error occurred.
 */
EC_KEY *EC_KEY_new(void);

int EC_KEY_get_flags(const EC_KEY *key);

void EC_KEY_set_flags(EC_KEY *key, int flags);

void EC_KEY_clear_flags(EC_KEY *key, int flags);

int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);

/** Creates a new EC_KEY object using a named curve as underlying
 *  EC_GROUP object.
 *  \param  nid  NID of the named curve.
 *  \return EC_KEY object or NULL if an error occurred.
 */
EC_KEY *EC_KEY_new_by_curve_name(int nid);

/** Frees a EC_KEY object.
 *  \param  key  EC_KEY object to be freed.
 */
void EC_KEY_free(EC_KEY *key);

/** Copies a EC_KEY object.
 *  \param  dst  destination EC_KEY object
 *  \param  src  src EC_KEY object
 *  \return dst or NULL if an error occurred.
 */
EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);

/** Creates a new EC_KEY object and copies the content from src to it.
 *  \param  src  the source EC_KEY object
 *  \return newly created EC_KEY object or NULL if an error occurred.
 */
EC_KEY *EC_KEY_dup(const EC_KEY *src);

/** Increases the internal reference count of a EC_KEY object.
 *  \param  key  EC_KEY object
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_up_ref(EC_KEY *key);

/** Returns the ENGINE object of a EC_KEY object
 *  \param  eckey  EC_KEY object
 *  \return the ENGINE object (possibly NULL).
 */
ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);

/** Returns the EC_GROUP object of a EC_KEY object
 *  \param  key  EC_KEY object
 *  \return the EC_GROUP object (possibly NULL).
 */
const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);

/** Sets the EC_GROUP of a EC_KEY object.
 *  \param  key    EC_KEY object
 *  \param  group  EC_GROUP to use in the EC_KEY object (note: the EC_KEY
 *                 object will use an own copy of the EC_GROUP).
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);

/** Returns the private key of a EC_KEY object.
 *  \param  key  EC_KEY object
 *  \return a BIGNUM with the private key (possibly NULL).
 */
const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);

/** Sets the private key of a EC_KEY object.
 *  \param  key  EC_KEY object
 *  \param  prv  BIGNUM with the private key (note: the EC_KEY object
 *               will use an own copy of the BIGNUM).
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);

/** Returns the public key of a EC_KEY object.
 *  \param  key  the EC_KEY object
 *  \return a EC_POINT object with the public key (possibly NULL)
 */
const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);

/** Sets the public key of a EC_KEY object.
 *  \param  key  EC_KEY object
 *  \param  pub  EC_POINT object with the public key (note: the EC_KEY object
 *               will use an own copy of the EC_POINT object).
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);

unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);

#define EC_KEY_get_ex_new_index(l, p, newf, dupf, freef) \
    CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);

/* wrapper functions for the underlying EC_GROUP object */
void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);

/** Creates a table of pre-computed multiples of the generator to
 *  accelerate further EC_KEY operations.
 *  \param  key  EC_KEY object
 *  \param  ctx  BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);

/** Creates a new ec private (and optional a new public) key.
 *  \param  key  EC_KEY object
 *  \return 1 on success and 0 if an error occurred.
 */
int EC_KEY_generate_key(EC_KEY *key);

/** Verifies that a private and/or public key is valid.
 *  \param  key  the EC_KEY object
 *  \return 1 on success and 0 otherwise.
 */
int EC_KEY_check_key(const EC_KEY *key);

/** Indicates if an EC_KEY can be used for signing.
 *  \param  eckey  the EC_KEY object
 *  \return 1 if can can sign and 0 otherwise.
 */
int EC_KEY_can_sign(const EC_KEY *eckey);

/** Sets a public key from affine coordinates performing
 *  necessary NIST PKV tests.
 *  \param  key  the EC_KEY object
 *  \param  x    public key x coordinate
 *  \param  y    public key y coordinate
 *  \return 1 on success and 0 otherwise.
 */
int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
                                             BIGNUM *y);

/** Encodes an EC_KEY public key to an allocated octet string
 *  \param  key    key to encode
 *  \param  form   point conversion form
 *  \param  pbuf   returns pointer to allocated buffer
 *  \param  ctx    BN_CTX object (optional)
 *  \return the length of the encoded octet string or 0 if an error occurred
 */
size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
                      unsigned char **pbuf, BN_CTX *ctx);

/** Decodes a EC_KEY public key from a octet string
 *  \param  key    key to decode
 *  \param  buf    memory buffer with the encoded ec point
 *  \param  len    length of the encoded ec point
 *  \param  ctx    BN_CTX object (optional)
 *  \return 1 on success and 0 if an error occurred
 */

int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
                   BN_CTX *ctx);

/** Decodes an EC_KEY private key from an octet string
 *  \param  key    key to decode
 *  \param  buf    memory buffer with the encoded private key
 *  \param  len    length of the encoded key
 *  \return 1 on success and 0 if an error occurred
 */

int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf, size_t len);

/** Encodes a EC_KEY private key to an octet string
 *  \param  key    key to encode
 *  \param  buf    memory buffer for the result. If NULL the function returns
 *                 required buffer size.
 *  \param  len    length of the memory buffer
 *  \return the length of the encoded octet string or 0 if an error occurred
 */

size_t EC_KEY_priv2oct(const EC_KEY *key, unsigned char *buf, size_t len);

/** Encodes an EC_KEY private key to an allocated octet string
 *  \param  eckey  key to encode
 *  \param  pbuf   returns pointer to allocated buffer
 *  \return the length of the encoded octet string or 0 if an error occurred
 */
size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);

/********************************************************************/
/*        de- and encoding functions for SEC1 ECPrivateKey          */
/********************************************************************/

/** Decodes a private key from a memory buffer.
 *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
 *  \param  in   pointer to memory with the DER encoded private key
 *  \param  len  length of the DER encoded private key
 *  \return the decoded private key or NULL if an error occurred.
 */
EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);

/** Encodes a private key object and stores the result in a buffer.
 *  \param  key  the EC_KEY object to encode
 *  \param  out  the buffer for the result (if NULL the function returns number
 *               of bytes needed).
 *  \return 1 on success and 0 if an error occurred.
 */
int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out);

/********************************************************************/
/*        de- and encoding functions for EC parameters              */
/********************************************************************/

/** Decodes ec parameter from a memory buffer.
 *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
 *  \param  in   pointer to memory with the DER encoded ec parameters
 *  \param  len  length of the DER encoded ec parameters
 *  \return a EC_KEY object with the decoded parameters or NULL if an error
 *          occurred.
 */
EC_KEY *d2i_ECParameters(EC_KEY **key, const unsigned char **in, long len);

/** Encodes ec parameter and stores the result in a buffer.
 *  \param  key  the EC_KEY object with ec parameters to encode
 *  \param  out  the buffer for the result (if NULL the function returns number
 *               of bytes needed).
 *  \return 1 on success and 0 if an error occurred.
 */
int i2d_ECParameters(EC_KEY *key, unsigned char **out);

/********************************************************************/
/*         de- and encoding functions for EC public key             */
/*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
/********************************************************************/

/** Decodes a ec public key from a octet string.
 *  \param  key  a pointer to a EC_KEY object which should be used
 *  \param  in   memory buffer with the encoded public key
 *  \param  len  length of the encoded public key
 *  \return EC_KEY object with decoded public key or NULL if an error
 *          occurred.
 */
EC_KEY *o2i_ECPublicKey(EC_KEY **key, const unsigned char **in, long len);

/** Encodes a ec public key in an octet string.
 *  \param  key  the EC_KEY object with the public key
 *  \param  out  the buffer for the result (if NULL the function returns number
 *               of bytes needed).
 *  \return 1 on success and 0 if an error occurred
 */
int i2o_ECPublicKey(const EC_KEY *key, unsigned char **out);

/** Prints out the ec parameters on human readable form.
 *  \param  bp   BIO object to which the information is printed
 *  \param  key  EC_KEY object
 *  \return 1 on success and 0 if an error occurred
 */
int ECParameters_print(BIO *bp, const EC_KEY *key);

/** Prints out the contents of a EC_KEY object
 *  \param  bp   BIO object to which the information is printed
 *  \param  key  EC_KEY object
 *  \param  off  line offset
 *  \return 1 on success and 0 if an error occurred
 */
int EC_KEY_print(BIO *bp, const EC_KEY *key, int off);

# ifndef OPENSSL_NO_STDIO
/** Prints out the ec parameters on human readable form.
 *  \param  fp   file descriptor to which the information is printed
 *  \param  key  EC_KEY object
 *  \return 1 on success and 0 if an error occurred
 */
int ECParameters_print_fp(FILE *fp, const EC_KEY *key);

/** Prints out the contents of a EC_KEY object
 *  \param  fp   file descriptor to which the information is printed
 *  \param  key  EC_KEY object
 *  \param  off  line offset
 *  \return 1 on success and 0 if an error occurred
 */
int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);

# endif

const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
const EC_KEY_METHOD *EC_KEY_get_default_method(void);
void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
EC_KEY *EC_KEY_new_method(ENGINE *engine);

/** The old name for ecdh_KDF_X9_63
 *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
 *  it is actually specified in ANSI X9.63.
 *  This identifier is retained for backwards compatibility
 */
int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
                   const unsigned char *Z, size_t Zlen,
                   const unsigned char *sinfo, size_t sinfolen,
                   const EVP_MD *md);

int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
                     const EC_KEY *ecdh,
                     void *(*KDF) (const void *in, size_t inlen,
                                   void *out, size_t *outlen));

typedef struct ECDSA_SIG_st ECDSA_SIG;

/** Allocates and initialize a ECDSA_SIG structure
 *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
 */
ECDSA_SIG *ECDSA_SIG_new(void);

/** frees a ECDSA_SIG structure
 *  \param  sig  pointer to the ECDSA_SIG structure
 */
void ECDSA_SIG_free(ECDSA_SIG *sig);

/** DER encode content of ECDSA_SIG object (note: this function modifies *pp
 *  (*pp += length of the DER encoded signature)).
 *  \param  sig  pointer to the ECDSA_SIG object
 *  \param  pp   pointer to a unsigned char pointer for the output or NULL
 *  \return the length of the DER encoded ECDSA_SIG object or a negative value
 *          on error
 */
int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);

/** Decodes a DER encoded ECDSA signature (note: this function changes *pp
 *  (*pp += len)).
 *  \param  sig  pointer to ECDSA_SIG pointer (may be NULL)
 *  \param  pp   memory buffer with the DER encoded signature
 *  \param  len  length of the buffer
 *  \return pointer to the decoded ECDSA_SIG structure (or NULL)
 */
ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);

/** Accessor for r and s fields of ECDSA_SIG
 *  \param  sig  pointer to ECDSA_SIG structure
 *  \param  pr   pointer to BIGNUM pointer for r (may be NULL)
 *  \param  ps   pointer to BIGNUM pointer for s (may be NULL)
 */
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);

/** Accessor for r field of ECDSA_SIG
 *  \param  sig  pointer to ECDSA_SIG structure
 */
const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig);

/** Accessor for s field of ECDSA_SIG
 *  \param  sig  pointer to ECDSA_SIG structure
 */
const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig);

/** Setter for r and s fields of ECDSA_SIG
 *  \param  sig  pointer to ECDSA_SIG structure
 *  \param  r    pointer to BIGNUM for r (may be NULL)
 *  \param  s    pointer to BIGNUM for s (may be NULL)
 */
int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);

/** Computes the ECDSA signature of the given hash value using
 *  the supplied private key and returns the created signature.
 *  \param  dgst      pointer to the hash value
 *  \param  dgst_len  length of the hash value
 *  \param  eckey     EC_KEY object containing a private EC key
 *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
 */
ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
                         EC_KEY *eckey);

/** Computes ECDSA signature of a given hash value using the supplied
 *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
 *  \param  dgst     pointer to the hash value to sign
 *  \param  dgstlen  length of the hash value
 *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
 *  \param  rp       BIGNUM with a pre-computed rp value (optional),
 *                   see ECDSA_sign_setup
 *  \param  eckey    EC_KEY object containing a private EC key
 *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
 */
ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
                            const BIGNUM *kinv, const BIGNUM *rp,
                            EC_KEY *eckey);

/** Verifies that the supplied signature is a valid ECDSA
 *  signature of the supplied hash value using the supplied public key.
 *  \param  dgst      pointer to the hash value
 *  \param  dgst_len  length of the hash value
 *  \param  sig       ECDSA_SIG structure
 *  \param  eckey     EC_KEY object containing a public EC key
 *  \return 1 if the signature is valid, 0 if the signature is invalid
 *          and -1 on error
 */
int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
                    const ECDSA_SIG *sig, EC_KEY *eckey);

/** Precompute parts of the signing operation
 *  \param  eckey  EC_KEY object containing a private EC key
 *  \param  ctx    BN_CTX object (optional)
 *  \param  kinv   BIGNUM pointer for the inverse of k
 *  \param  rp     BIGNUM pointer for x coordinate of k * generator
 *  \return 1 on success and 0 otherwise
 */
int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, BIGNUM **rp);

/** Computes ECDSA signature of a given hash value using the supplied
 *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
 *  \param  type     this parameter is ignored
 *  \param  dgst     pointer to the hash value to sign
 *  \param  dgstlen  length of the hash value
 *  \param  sig      memory for the DER encoded created signature
 *  \param  siglen   pointer to the length of the returned signature
 *  \param  eckey    EC_KEY object containing a private EC key
 *  \return 1 on success and 0 otherwise
 */
int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
               unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);

/** Computes ECDSA signature of a given hash value using the supplied
 *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
 *  \param  type     this parameter is ignored
 *  \param  dgst     pointer to the hash value to sign
 *  \param  dgstlen  length of the hash value
 *  \param  sig      buffer to hold the DER encoded signature
 *  \param  siglen   pointer to the length of the returned signature
 *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
 *  \param  rp       BIGNUM with a pre-computed rp value (optional),
 *                   see ECDSA_sign_setup
 *  \param  eckey    EC_KEY object containing a private EC key
 *  \return 1 on success and 0 otherwise
 */
int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
                  unsigned char *sig, unsigned int *siglen,
                  const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);

/** Verifies that the given signature is valid ECDSA signature
 *  of the supplied hash value using the specified public key.
 *  \param  type     this parameter is ignored
 *  \param  dgst     pointer to the hash value
 *  \param  dgstlen  length of the hash value
 *  \param  sig      pointer to the DER encoded signature
 *  \param  siglen   length of the DER encoded signature
 *  \param  eckey    EC_KEY object containing a public EC key
 *  \return 1 if the signature is valid, 0 if the signature is invalid
 *          and -1 on error
 */
int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
                 const unsigned char *sig, int siglen, EC_KEY *eckey);

/** Returns the maximum length of the DER encoded signature
 *  \param  eckey  EC_KEY object
 *  \return numbers of bytes required for the DER encoded signature
 */
int ECDSA_size(const EC_KEY *eckey);

/********************************************************************/
/*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
/********************************************************************/

EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth);
void EC_KEY_METHOD_free(EC_KEY_METHOD *meth);
void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
                            int (*init)(EC_KEY *key),
                            void (*finish)(EC_KEY *key),
                            int (*copy)(EC_KEY *dest, const EC_KEY *src),
                            int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
                            int (*set_private)(EC_KEY *key,
                                               const BIGNUM *priv_key),
                            int (*set_public)(EC_KEY *key,
                                              const EC_POINT *pub_key));

void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
                              int (*keygen)(EC_KEY *key));

void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
                                   int (*ckey)(unsigned char **psec,
                                               size_t *pseclen,
                                               const EC_POINT *pub_key,
                                               const EC_KEY *ecdh));

void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
                            int (*sign)(int type, const unsigned char *dgst,
                                        int dlen, unsigned char *sig,
                                        unsigned int *siglen,
                                        const BIGNUM *kinv, const BIGNUM *r,
                                        EC_KEY *eckey),
                            int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
                                              BIGNUM **kinvp, BIGNUM **rp),
                            ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
                                                   int dgst_len,
                                                   const BIGNUM *in_kinv,
                                                   const BIGNUM *in_r,
                                                   EC_KEY *eckey));

void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
                              int (*verify)(int type, const unsigned
                                            char *dgst, int dgst_len,
                                            const unsigned char *sigbuf,
                                            int sig_len, EC_KEY *eckey),
                              int (*verify_sig)(const unsigned char *dgst,
                                                int dgst_len,
                                                const ECDSA_SIG *sig,
                                                EC_KEY *eckey));

void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
                            int (**pinit)(EC_KEY *key),
                            void (**pfinish)(EC_KEY *key),
                            int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
                            int (**pset_group)(EC_KEY *key,
                                               const EC_GROUP *grp),
                            int (**pset_private)(EC_KEY *key,
                                                 const BIGNUM *priv_key),
                            int (**pset_public)(EC_KEY *key,
                                                const EC_POINT *pub_key));

void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
                              int (**pkeygen)(EC_KEY *key));

void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
                                   int (**pck)(unsigned char **psec,
                                               size_t *pseclen,
                                               const EC_POINT *pub_key,
                                               const EC_KEY *ecdh));

void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
                            int (**psign)(int type, const unsigned char *dgst,
                                          int dlen, unsigned char *sig,
                                          unsigned int *siglen,
                                          const BIGNUM *kinv, const BIGNUM *r,
                                          EC_KEY *eckey),
                            int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
                                                BIGNUM **kinvp, BIGNUM **rp),
                            ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
                                                     int dgst_len,
                                                     const BIGNUM *in_kinv,
                                                     const BIGNUM *in_r,
                                                     EC_KEY *eckey));

void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
                              int (**pverify)(int type, const unsigned
                                              char *dgst, int dgst_len,
                                              const unsigned char *sigbuf,
                                              int sig_len, EC_KEY *eckey),
                              int (**pverify_sig)(const unsigned char *dgst,
                                                  int dgst_len,
                                                  const ECDSA_SIG *sig,
                                                  EC_KEY *eckey));

# define ECParameters_dup(x) ASN1_dup_of(EC_KEY,i2d_ECParameters,d2i_ECParameters,x)

# ifndef __cplusplus
#  if defined(__SUNPRO_C)
#   if __SUNPRO_C >= 0x520
#    pragma error_messages (default,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
#   endif
#  endif
# endif

# define EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
                                EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL)

# define EVP_PKEY_CTX_set_ec_param_enc(ctx, flag) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
                                EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL)

# define EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, flag) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_ECDH_COFACTOR, flag, NULL)

# define EVP_PKEY_CTX_get_ecdh_cofactor_mode(ctx) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_ECDH_COFACTOR, -2, NULL)

# define EVP_PKEY_CTX_set_ecdh_kdf_type(ctx, kdf) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL)

# define EVP_PKEY_CTX_get_ecdh_kdf_type(ctx) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL)

# define EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_MD, 0, (void *)(md))

# define EVP_PKEY_CTX_get_ecdh_kdf_md(ctx, pmd) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void *)(pmd))

# define EVP_PKEY_CTX_set_ecdh_kdf_outlen(ctx, len) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_OUTLEN, len, NULL)

# define EVP_PKEY_CTX_get_ecdh_kdf_outlen(ctx, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN, 0, \
                                (void *)(plen))

# define EVP_PKEY_CTX_set0_ecdh_kdf_ukm(ctx, p, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_UKM, plen, (void *)(p))

# define EVP_PKEY_CTX_get0_ecdh_kdf_ukm(ctx, p) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_UKM, 0, (void *)(p))

/* SM2 will skip the operation check so no need to pass operation here */
# define EVP_PKEY_CTX_set1_id(ctx, id, id_len) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_SET1_ID, (int)id_len, (void*)(id))

# define EVP_PKEY_CTX_get1_id(ctx, id) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_GET1_ID, 0, (void*)(id))

# define EVP_PKEY_CTX_get1_id_len(ctx, id_len) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_GET1_ID_LEN, 0, (void*)(id_len))

# define EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID             (EVP_PKEY_ALG_CTRL + 1)
# define EVP_PKEY_CTRL_EC_PARAM_ENC                      (EVP_PKEY_ALG_CTRL + 2)
# define EVP_PKEY_CTRL_EC_ECDH_COFACTOR                  (EVP_PKEY_ALG_CTRL + 3)
# define EVP_PKEY_CTRL_EC_KDF_TYPE                       (EVP_PKEY_ALG_CTRL + 4)
# define EVP_PKEY_CTRL_EC_KDF_MD                         (EVP_PKEY_ALG_CTRL + 5)
# define EVP_PKEY_CTRL_GET_EC_KDF_MD                     (EVP_PKEY_ALG_CTRL + 6)
# define EVP_PKEY_CTRL_EC_KDF_OUTLEN                     (EVP_PKEY_ALG_CTRL + 7)
# define EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN                 (EVP_PKEY_ALG_CTRL + 8)
# define EVP_PKEY_CTRL_EC_KDF_UKM                        (EVP_PKEY_ALG_CTRL + 9)
# define EVP_PKEY_CTRL_GET_EC_KDF_UKM                    (EVP_PKEY_ALG_CTRL + 10)
# define EVP_PKEY_CTRL_SET1_ID                           (EVP_PKEY_ALG_CTRL + 11)
# define EVP_PKEY_CTRL_GET1_ID                           (EVP_PKEY_ALG_CTRL + 12)
# define EVP_PKEY_CTRL_GET1_ID_LEN                       (EVP_PKEY_ALG_CTRL + 13)
/* KDF types */
# define EVP_PKEY_ECDH_KDF_NONE                          1
# define EVP_PKEY_ECDH_KDF_X9_63                         2
/** The old name for EVP_PKEY_ECDH_KDF_X9_63
 *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
 *  it is actually specified in ANSI X9.63.
 *  This identifier is retained for backwards compatibility
 */
# define EVP_PKEY_ECDH_KDF_X9_62   EVP_PKEY_ECDH_KDF_X9_63


#  ifdef  __cplusplus
}
#  endif
# endif
#endif