k256 0.11.6

secp256k1 elliptic curve library written in pure Rust with support for ECDSA signing/verification (including Ethereum-style signatures with public-key recovery), Elliptic Curve Diffie-Hellman (ECDH), and general purpose secp256k1 curve arithmetic useful for implementing arbitrary group-based protocols.
Documentation 
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

# Changelog
All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## 0.11.6 (2022-09-27)
### Added
- `ecdsa::recoverable::Signature::from_digest_bytes_trial_recovery` ([#660])

### Changed
- Make `ProjectivePoint` equality and `is_identity` faster ([#650])

[#650]: https://github.com/RustCrypto/elliptic-curves/pull/650
[#660]: https://github.com/RustCrypto/elliptic-curves/pull/660

## 0.11.5 (2022-09-14)
### Added
- Impl `PrehashSigner` and `PrehashVerifier` traits for ECDSA keys ([#653])
- Impl `Keypair` for `SigningKey` ([#654])

[#653]: https://github.com/RustCrypto/elliptic-curves/pull/653
[#654]: https://github.com/RustCrypto/elliptic-curves/pull/654

## 0.11.4 (2022-08-13)
### Added
- Impl `ZeroizeOnDrop` for `ecdsa::SigningKey` and `schnorr::SigningKey` ([#630])

### Changed
- Get rid of eager computation in `mul_shift_vartime()` ([#638])
- Bump the precision of precomputed division for the scalar decomposition ([#639])

[#630]: https://github.com/RustCrypto/elliptic-curves/pull/630
[#638]: https://github.com/RustCrypto/elliptic-curves/pull/638
[#639]: https://github.com/RustCrypto/elliptic-curves/pull/639

## 0.11.3 (2022-07-02)
### Changed
- Relax `DigestSigner` trait bounds ([#613])
- Bump `elliptic-curve` to v0.12.2 ([#616])

[#613]: https://github.com/RustCrypto/elliptic-curves/pull/613
[#616]: https://github.com/RustCrypto/elliptic-curves/pull/616

## 0.11.2 (2022-05-24)
### Changed
- Enable `schnorr` feature by default ([#561])

[#561]: https://github.com/RustCrypto/elliptic-curves/pull/561

## 0.11.1 (2022-05-24)
### Added
- Taproot Schnorr as defined in BIP 340 ([#554], [#557], [#558])
- Re-export low-level `diffie_hellman` function ([#556])

### Changed
- Use SHA-256 for computing RFC6979 for `recoverable::Signature` ([#552])

[#552]: https://github.com/RustCrypto/elliptic-curves/pull/552
[#554]: https://github.com/RustCrypto/elliptic-curves/pull/554
[#556]: https://github.com/RustCrypto/elliptic-curves/pull/556
[#557]: https://github.com/RustCrypto/elliptic-curves/pull/557
[#558]: https://github.com/RustCrypto/elliptic-curves/pull/558

## 0.11.0 (2022-05-09)
### Changed
- Bump `digest` to v0.10 ([#515])
- Make `AffinePoint` to `VerifyingKey` conversion fallible ([#535])
- Rename `recover_verify_key` => `recover_verifying_key` ([#537])
- Rename `recover_verify_key_from_digest` => `recover_verifying_key_from_digest` ([#537])
- Have `pkcs8` feature activate `ecdsa/pkcs8` ([#538])
- Bump `elliptic-curve` to v0.12 ([#544])
- Bump `ecdsa` to v0.14 ([#544])

### Fixed
- `hash2curve` crate feature ([#519])

[#515]: https://github.com/RustCrypto/elliptic-curves/pull/515
[#519]: https://github.com/RustCrypto/elliptic-curves/pull/519
[#535]: https://github.com/RustCrypto/elliptic-curves/pull/535
[#537]: https://github.com/RustCrypto/elliptic-curves/pull/537
[#538]: https://github.com/RustCrypto/elliptic-curves/pull/538
[#544]: https://github.com/RustCrypto/elliptic-curves/pull/544

## 0.10.4 (2022-03-15)
### Fixed
- Normalize before calling `is_odd()` in `sng0()` ([#533])

[#533]: https://github.com/RustCrypto/elliptic-curves/pull/533

## 0.10.3 (2022-03-14)
### Fixed
- Do not normalize the argument in `FieldElementImpl::is_odd()` ([#530])

[#530]: https://github.com/RustCrypto/elliptic-curves/pull/530

## 0.10.2 (2022-01-17)
### Added
- hash2curve support: impl `GroupDigest` for `Secp256k1` ([#503])
- `IDENTITY` and `GENERATOR` point constants ([#511])

[#503]: https://github.com/RustCrypto/elliptic-curves/pull/503
[#511]: https://github.com/RustCrypto/elliptic-curves/pull/511

## 0.10.1 (2022-01-04)
### Added
- Impl `ff::Field` trait for `FieldElement` ([#498])
- Impl `ReduceNonZero<U256>` for `Scalar` ([#501])

[#498]: https://github.com/RustCrypto/elliptic-curves/pull/498
[#501]: https://github.com/RustCrypto/elliptic-curves/pull/501

## 0.10.0 (2021-12-14)
### Added
- Implement `Scalar::sqrt` ([#400])
- Impl `PrimeCurveArithmetic` ([#415])
- Impl `Reduce<U256>` for `Scalar` ([#436])
- Impl `Drop` for `ecdsa::SigningKey` ([#449])
- `serde` feature ([#463], [#464])
- Impl `Reduce<U512>` for `Scalar` ([#472])
- Impl `ReduceNonZero<U512>` for `Scalar` ([#474])
- Impl `LinearCombination` trait ([#476])

### Changed
- Make `ecdsa::Signature::normalize_s` non-mutating ([#405])
- Use `PrimeCurve` trait ([#413])
- Use `sec1` crate for `EncodedPoint` type ([#435])
- Replace `ecdsa::hazmat::FromDigest` with `Reduce` ([#438])
- Make `FromEncodedPoint` return a `CtOption` ([#445])
- Rust 2021 edition upgrade; MSRV 1.56+ ([#453])
- Bump `elliptic-curve` crate dependency to v0.11 ([#466])
- Bump `ecdsa` crate dependency to v0.13 ([#467])

### Fixed
- Handle identity point in `GroupEncoding` ([#446])

### Removed
- `force-32-bit` feature ([#399])
- `field-montgomery` feature ([#404])
- `Scalar::conditional_add_bit` ([#431])
- Deprecated `SigningKey::verify_key` method ([#461])

[#399]: https://github.com/RustCrypto/elliptic-curves/pull/399
[#400]: https://github.com/RustCrypto/elliptic-curves/pull/400
[#404]: https://github.com/RustCrypto/elliptic-curves/pull/404
[#405]: https://github.com/RustCrypto/elliptic-curves/pull/405
[#413]: https://github.com/RustCrypto/elliptic-curves/pull/413
[#415]: https://github.com/RustCrypto/elliptic-curves/pull/415
[#431]: https://github.com/RustCrypto/elliptic-curves/pull/431
[#435]: https://github.com/RustCrypto/elliptic-curves/pull/435
[#436]: https://github.com/RustCrypto/elliptic-curves/pull/436
[#438]: https://github.com/RustCrypto/elliptic-curves/pull/438
[#445]: https://github.com/RustCrypto/elliptic-curves/pull/445
[#446]: https://github.com/RustCrypto/elliptic-curves/pull/446
[#449]: https://github.com/RustCrypto/elliptic-curves/pull/449
[#453]: https://github.com/RustCrypto/elliptic-curves/pull/453
[#461]: https://github.com/RustCrypto/elliptic-curves/pull/461
[#463]: https://github.com/RustCrypto/elliptic-curves/pull/463
[#464]: https://github.com/RustCrypto/elliptic-curves/pull/464
[#466]: https://github.com/RustCrypto/elliptic-curves/pull/466
[#467]: https://github.com/RustCrypto/elliptic-curves/pull/467
[#472]: https://github.com/RustCrypto/elliptic-curves/pull/472
[#474]: https://github.com/RustCrypto/elliptic-curves/pull/474
[#476]: https://github.com/RustCrypto/elliptic-curves/pull/476

## 0.9.6 (2021-07-22)
### Added
- Wycheproof test vectors ([#384])

### Fixed
- Edge case in `Scalar::is_high` ([#385])
- Bug in overflow check during 32-bit multiplication ([#388])

[#384]: https://github.com/RustCrypto/elliptic-curves/pull/384
[#385]: https://github.com/RustCrypto/elliptic-curves/pull/385
[#388]: https://github.com/RustCrypto/elliptic-curves/pull/388

## 0.9.5 (2021-07-18)
### Changed
- Optimize ECDSA using linear combination of points ([#380])

[#380]: https://github.com/RustCrypto/elliptic-curves/pull/380

## 0.9.4 (2021-06-23)
### Added
- Derive `Clone` for `ecdsa::SigningKey` ([#374])

[#374]: https://github.com/RustCrypto/elliptic-curves/pull/374

## 0.9.3 (2021-06-21)
### Added
- `ecdsa::SigningKey::verifying_key()` method ([#363])

### Changed
- Deprecate `SigningKey::verify_key()` - use `verifying_key` instead ([#363])
- Bump `elliptic-curve` dependency to v0.10.3 ([#371])

[#363]: https://github.com/RustCrypto/elliptic-curves/pull/363
[#371]: https://github.com/RustCrypto/elliptic-curves/pull/371

## 0.9.2 (2021-06-14) [YANKED]
### Added
- `Debug` impl for `ecdsa::SigningKey` ([#358])
- `ConstantTimeEq`/`Eq`/`PartialEq` impls for `ecdsa::SigningKey` ([#359])

[#358]: https://github.com/RustCrypto/elliptic-curves/pull/358
[#359]: https://github.com/RustCrypto/elliptic-curves/pull/359

## 0.9.1 (2021-06-09) [YANKED]
### Added
- `Copy` impl for `ecdsa::VerifyingKey` ([#355])

[#355]: https://github.com/RustCrypto/elliptic-curves/pull/355

## 0.9.0 (2021-06-08) [YANKED]
### Added
- Derive `Ord` on `ecdsa::VerifyingKey` ([#343])
- `AffineArithmetic` trait impl ([#347])
- `PrimeCurve` trait impls ([#350])

### Changed
- Bump `elliptic-curve` to v0.10; MSRV 1.51+ ([#349])
- Bump `ecdsa` to v0.12 ([#349])

[#343]: https://github.com/RustCrypto/elliptic-curves/pull/343
[#347]: https://github.com/RustCrypto/elliptic-curves/pull/347
[#349]: https://github.com/RustCrypto/elliptic-curves/pull/349
[#350]: https://github.com/RustCrypto/elliptic-curves/pull/350

## 0.8.1 (2021-05-10)
### Fixed
- Mixed coordinate addition with the point at infinity ([#337])

[#337]: https://github.com/RustCrypto/elliptic-curves/pull/337

## 0.8.0 (2021-04-29)
### Added
- `jwk` feature ([#295])
- `Order` constant ([#328])

### Changed
- Rename `ecdsa::Asn1Signature` to `::DerSignature` ([#288])
- Migrate to `FromDigest` trait from `ecdsa` crate ([#292])
- Bump `elliptic-curve` to v0.9.2 ([#296])
- Bump `pkcs8` to v0.6 ([#319])
- Bump `ecdsa` crate dependency to v0.11 ([#330])

### Fixed
- `DigestPrimitive` feature gating ([#324])

[#288]: https://github.com/RustCrypto/elliptic-curves/pull/288
[#292]: https://github.com/RustCrypto/elliptic-curves/pull/292
[#295]: https://github.com/RustCrypto/elliptic-curves/pull/295
[#296]: https://github.com/RustCrypto/elliptic-curves/pull/296
[#319]: https://github.com/RustCrypto/elliptic-curves/pull/319
[#324]: https://github.com/RustCrypto/elliptic-curves/pull/324
[#328]: https://github.com/RustCrypto/elliptic-curves/pull/328
[#330]: https://github.com/RustCrypto/elliptic-curves/pull/330

## 0.7.3 (2021-04-16)
### Changed
- Make `ecdsa` a default feature ([#325])

[#325]: https://github.com/RustCrypto/elliptic-curves/pull/325

## 0.7.2 (2021-01-13)
### Changed
- Have `std` feature activate `ecdsa-core/std` ([#273])

[#273]: https://github.com/RustCrypto/elliptic-curves/pull/273

## 0.7.1 (2020-12-16)
### Fixed
- Trigger docs.rs rebuild with nightly bugfix ([RustCrypto/traits#412])

[RustCrypto/traits#412]: https://github.com/RustCrypto/traits/pull/412

## 0.7.0 (2020-12-16)
### Changed
- Bump `elliptic-curve` dependency to v0.8 ([#260])
- Bump `ecdsa` to v0.10 ([#260])

[#260]: https://github.com/RustCrypto/elliptic-curves/pull/260

## 0.6.0 (2020-12-06)
### Added
- PKCS#8 support ([#243], [#244], [#251])
- `PublicKey` type ([#239])

### Changed
- Bump `elliptic-curve` crate dependency to v0.7; MSRV 1.46+ ([#247])
- Bump `ecdsa` crate dependency to v0.9 ([#247])
- Make `SigningKey` a newtype of `elliptic_curve::SecretKey` ([#242])

[#251]: https://github.com/RustCrypto/elliptic-curves/pull/251
[#247]: https://github.com/RustCrypto/elliptic-curves/pull/247
[#244]: https://github.com/RustCrypto/elliptic-curves/pull/244
[#243]: https://github.com/RustCrypto/elliptic-curves/pull/243
[#242]: https://github.com/RustCrypto/elliptic-curves/pull/242
[#239]: https://github.com/RustCrypto/elliptic-curves/pull/239

## 0.5.10 (2020-10-25)
### Changed
- Expand README.md ([#233])

[#233]: https://github.com/RustCrypto/elliptic-curves/pull/233

## 0.5.9 (2020-10-08)
### Changed
- Bump `cfg-if` from 0.1.10 to 1.0.0 ([#220])

[#220]: https://github.com/RustCrypto/elliptic-curves/pull/220

## 0.5.8 (2020-10-08)
### Fixed
- Regenerate `rustdoc` on https://docs.rs after nightly breakage

## 0.5.7 (2020-10-08)
### Added
- `SecretValue` impl when `arithmetic` feature is disabled ([#222])

[#222]: https://github.com/RustCrypto/elliptic-curves/pull/222

## 0.5.6 (2020-09-28)
### Added
- Enable `endomorphism-mul` optimizations by default ([#213])

[#213]: https://github.com/RustCrypto/elliptic-curves/pull/213

## 0.5.5 (2020-09-27)
### Added
- Impl `FromEncodedPoint` for `ProjectivePoint` ([#210])
- Impl `ToEncodedPoint` for `ecdsa::VerifyKey` ([#209])

[#210]: https://github.com/RustCrypto/elliptic-curves/pull/210
[#209]: https://github.com/RustCrypto/elliptic-curves/pull/209

## 0.5.4 (2020-09-27)
### Added
- Impl `RecoverableSignPrimtive` on `Scalar` ([#206])
- `recoverable::Signature::recover_verify_key_from_digest_bytes` ([#205])

[#206]: https://github.com/RustCrypto/elliptic-curves/pull/206
[#205]: https://github.com/RustCrypto/elliptic-curves/pull/205

## 0.5.3 (2020-09-23)
### Added
- Derive `Copy` on `VerifyKey` ([#202])

[#202]: https://github.com/RustCrypto/elliptic-curves/pull/202

## 0.5.2 (2020-09-22)
### Fixed
- Corrected imports when using `ecdsa` + `keccak256` features ([#199])

[#199]: https://github.com/RustCrypto/elliptic-curves/pull/199

## 0.5.1 (2020-09-21)
### Added
- Documentation for `sha256` feature ([#197])
- `sec1::EncodedPoint::decompress` test ([#194])
- Impl `RandomizedSigner` on `SigningKey` ([#193])

### Changed
- Gate ecdsa::{Signer, Verifier} impls on `sha256` feature ([#192])

[#197]: https://github.com/RustCrypto/elliptic-curves/pull/197
[#194]: https://github.com/RustCrypto/elliptic-curves/pull/194
[#193]: https://github.com/RustCrypto/elliptic-curves/pull/193
[#192]: https://github.com/RustCrypto/elliptic-curves/pull/192

## 0.5.0 (2020-09-17)
### Added
- `ecdsa::Asn1Signature` type alias ([#186])
- `ff` and `group` crate dependencies; MSRV 1.44+ ([#164], [#174])
- `AffinePoint::identity()` and `::is_identity()` ([#165])
- `expose-field` feature ([#161])
- `keccak256` feature ([#142])

### Changed
- Bump `elliptic-curve` crate to v0.6; `ecdsa` to v0.8 ([#180])
- Refactor ProjectiveArithmetic trait ([#179])
- Support generic inner type for `elliptic_curve::SecretKey<C>` ([#177])
- Rename `ElementBytes` => `FieldBytes` ([#176])
- Factor out a `from_digest_trial_recovery` method ([#168])
- Rename `ecdsa::{Signer, Verifier}` => `::{SigningKey, VerifyKey}` ([#153])
- Rename `Curve::ElementSize` => `FieldSize` ([#150])
- Implement RFC6979 deterministic ECDSA ([#146])
- Use `NonZeroScalar` for ECDSA signature components ([#144])
- Eagerly verify ECDSA scalars are in range ([#143])
- Rename `PublicKey` to `EncodedPoint` ([#141])

### Removed
- `rand` feature ([#162])

[#186]: https://github.com/RustCrypto/elliptic-curves/pull/186
[#180]: https://github.com/RustCrypto/elliptic-curves/pull/180
[#179]: https://github.com/RustCrypto/elliptic-curves/pull/179
[#177]: https://github.com/RustCrypto/elliptic-curves/pull/177
[#176]: https://github.com/RustCrypto/elliptic-curves/pull/176
[#174]: https://github.com/RustCrypto/elliptic-curves/pull/174
[#168]: https://github.com/RustCrypto/elliptic-curves/pull/168
[#165]: https://github.com/RustCrypto/elliptic-curves/pull/165
[#164]: https://github.com/RustCrypto/elliptic-curves/pull/164
[#162]: https://github.com/RustCrypto/elliptic-curves/pull/162
[#161]: https://github.com/RustCrypto/elliptic-curves/pull/161
[#153]: https://github.com/RustCrypto/elliptic-curves/pull/153
[#150]: https://github.com/RustCrypto/elliptic-curves/pull/150
[#146]: https://github.com/RustCrypto/elliptic-curves/pull/146
[#144]: https://github.com/RustCrypto/elliptic-curves/pull/144
[#143]: https://github.com/RustCrypto/elliptic-curves/pull/143
[#142]: https://github.com/RustCrypto/elliptic-curves/pull/142
[#141]: https://github.com/RustCrypto/elliptic-curves/pull/141

## 0.4.2 (2020-08-11)
### Fixed
- Builds with either `ecdsa-core` or `sha256` in isolation ([#133])

[#133]: https://github.com/RustCrypto/elliptic-curves/pull/133

## 0.4.1 (2020-08-10)
### Fixed
- secp256k1 rustdoc link ([#131])

[#131]: https://github.com/RustCrypto/elliptic-curves/pull/131

## 0.4.0 (2020-08-10)
### Added
- ECDSA support ([#73], [#101], [#104], [#105])
- ECDSA public key recovery support ([#110])
- OID support ([#103], [#113])
- Elliptic Curve Diffie-Hellman ([#120])
- `Zeroize` impl for `AffinePoint` and `FieldElement` types ([#124])

### Changed
- Optimized field arithmetic with 32-bit and 64-bit backends ([#59], [#82])
- Bump `elliptic-curve` crate dependency to v0.5 ([#126])

[#59]: https://github.com/RustCrypto/elliptic-curves/pull/59
[#73]: https://github.com/RustCrypto/elliptic-curves/pull/73
[#82]: https://github.com/RustCrypto/elliptic-curves/pull/82
[#101]: https://github.com/RustCrypto/elliptic-curves/pull/101
[#103]: https://github.com/RustCrypto/elliptic-curves/pull/103
[#104]: https://github.com/RustCrypto/elliptic-curves/pull/104
[#105]: https://github.com/RustCrypto/elliptic-curves/pull/105
[#110]: https://github.com/RustCrypto/elliptic-curves/pull/110
[#113]: https://github.com/RustCrypto/elliptic-curves/pull/113
[#120]: https://github.com/RustCrypto/elliptic-curves/pull/120
[#124]: https://github.com/RustCrypto/elliptic-curves/pull/124
[#126]: https://github.com/RustCrypto/elliptic-curves/pull/126

## 0.3.0 (2020-06-08)
### Changed
- Bump `elliptic-curve` crate dependency to v0.4 ([#39])

[#39]: https://github.com/RustCrypto/elliptic-curves/pull/39

## 0.2.0 (2020-04-30)
### Added
- Field arithmetic, point addition/doubling, and scalar multiplication ([#19])

[#19]: https://github.com/RustCrypto/elliptic-curves/pull/19

## 0.1.1 (2020-04-20)
### Fixed
- README.md: fix typo in crate name ([#16])

[#16]: https://github.com/RustCrypto/elliptic-curves/pull/16

## 0.1.0 (2020-01-15)
- Initial release