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Merge bitcoin-core/secp256k1#1354: Add ellswift to CHANGELOG

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7c7467ab7f935f6b982064c8c48772a433da1f8f Refer to ellswift.md in API docs (Pieter Wuille)
c32ffd8d8c833a964ee7fbb294640764ad25de5d Add ellswift to CHANGELOG (Pieter Wuille)

Pull request description:

  A follow-up with a CHANGELOG entry for #1129.

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Tim Ruffing 2023-06-25 09:49:17 +02:00
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CHANGELOG.md
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@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased] ## [Unreleased]
#### Added
- New module `ellswift` implements ElligatorSwift encoding for public keys and x-only Diffie-Hellman key exchange for them.
ElligatorSwift permits representing secp256k1 public keys as 64-byte arrays which cannot be distinguished from uniformly random. See:
- Header file `include/secp256k1_ellswift.h` which defines the new API.
- Document `doc/ellswift.md` which explains the mathematical background of the scheme.
- The [paper](https://eprint.iacr.org/2022/759) on which the scheme is based.
## [0.3.2] - 2023-05-13 ## [0.3.2] - 2023-05-13
We strongly recommend updating to 0.3.2 if you use or plan to use GCC >=13 to compile libsecp256k1. When in doubt, check the GCC version using `gcc -v`. We strongly recommend updating to 0.3.2 if you use or plan to use GCC >=13 to compile libsecp256k1. When in doubt, check the GCC version using `gcc -v`.

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include/secp256k1_ellswift.h
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@ -41,6 +41,8 @@ extern "C" {
* - The paper uses an additional encoding bit for the parity of y. Here the * - The paper uses an additional encoding bit for the parity of y. Here the
* parity of t is used (negating t does not affect the decoded x coordinate, * parity of t is used (negating t does not affect the decoded x coordinate,
* so this is possible). * so this is possible).
*
* For mathematical background about the scheme, see the doc/ellswift.md file.
*/ */
/** A pointer to a function used by secp256k1_ellswift_xdh to hash the shared X /** A pointer to a function used by secp256k1_ellswift_xdh to hash the shared X