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# 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).

## [0.6.0] - 2024-11-04

#### Added
 - New module `musig` implements the MuSig2 multisignature scheme according to the [BIP 327 specification](https://github.com/bitcoin/bips/blob/master/bip-0327.mediawiki). See:
   - Header file `include/secp256k1_musig.h` which defines the new API.
   - Document `doc/musig.md` for further notes on API usage.
   - Usage example `examples/musig.c`.
 - New CMake variable `SECP256K1_APPEND_LDFLAGS` for appending linker flags to the build command.

#### Changed
 - API functions now use a significantly more robust method to clear secrets from the stack before returning. However, secret clearing remains a best-effort security measure and cannot guarantee complete removal.
 - Any type `secp256k1_foo` can now be forward-declared using `typedef struct secp256k1_foo secp256k1_foo;` (or also `struct secp256k1_foo;` in C++).
 - Organized CMake build artifacts into dedicated directories (`bin/` for executables, `lib/` for libraries) to improve build output structure and Windows shared library compatibility.

#### Removed
 - Removed the `secp256k1_scratch_space` struct and its associated functions `secp256k1_scratch_space_create` and `secp256k1_scratch_space_destroy` because the scratch space was unused in the API.

#### ABI Compatibility
The symbols `secp256k1_scratch_space_create` and `secp256k1_scratch_space_destroy` were removed.
Otherwise, the library maintains backward compatibility with versions 0.3.x through 0.5.x.

## [0.5.1] - 2024-08-01

#### Added
 - Added usage example for an ElligatorSwift key exchange.

#### Changed
 - The default size of the precomputed table for signing was changed from 22 KiB to 86 KiB. The size can be changed with the configure option `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
 - "auto" is no longer an accepted value for the `--with-ecmult-window` and `--with-ecmult-gen-kb` configure options (this also applies to  `SECP256K1_ECMULT_WINDOW_SIZE` and `SECP256K1_ECMULT_GEN_KB` in CMake). To achieve the same configuration as p...

#### Fixed
 - Fixed compilation when the extrakeys module is disabled.

#### ABI Compatibility
The ABI is backward compatible with versions 0.5.0, 0.4.x and 0.3.x.

## [0.5.0] - 2024-05-06

#### Added
 - New function `secp256k1_ec_pubkey_sort` that sorts public keys using lexicographic (of compressed serialization) order.

#### Changed
 - The implementation of the point multiplication algorithm used for signing and public key generation was changed, resulting in improved performance for those operations.
   - The related configure option `--ecmult-gen-precision` was replaced with `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
   - This changes the supported precomputed table sizes for these operations. The new supported sizes are 2 KiB, 22 KiB, or 86 KiB (while the old supported sizes were 32 KiB, 64 KiB, or 512 KiB).

#### ABI Compatibility
The ABI is backward compatible with versions 0.4.x and 0.3.x.

## [0.4.1] - 2023-12-21

#### Changed
 - The point multiplication algorithm used for ECDH operations (module `ecdh`) was replaced with a slightly faster one.
 - Optional handwritten x86_64 assembly for field operations was removed because modern C compilers are able to output more efficient assembly. This change results in a significant speedup of some library functions when handwritten x86_64 assembly is...

#### ABI Compatibility
The ABI is backward compatible with versions 0.4.0 and 0.3.x.

## [0.4.0] - 2023-09-04

#### 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.
 - We now test the library with unreleased development snapshots of GCC and Clang. This gives us an early chance to catch miscompilations and constant-time issues introduced by the compiler (such as those that led to the previous two releases).

#### Fixed
 - Fixed symbol visibility in Windows DLL builds, where three internal library symbols were wrongly exported.