54 lines
3.6 KiB
Markdown
54 lines
3.6 KiB
Markdown
# Changelog
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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#### Added
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- Usage examples: Added a recommended method for securely clearing sensitive data, e.g., secret keys, from memory.
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- Tests: Added a new test binary `noverify_tests`. This binary runs the tests without some additional checks present in the ordinary `tests` binary and is thereby closer to production binaries. The `noverify_tests` binary is automatically run as part of the `make check` target.
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#### Fixed
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- Fixed declarations of API variables for MSVC (`__declspec(dllimport)`). This fixes MSVC builds of programs which link against a libsecp256k1 DLL dynamically and use API variables (and not only API functions). Unfortunately, the MSVC linker now will emit warning `LNK4217` when trying to link against libsecp256k1 statically. Pass `/ignore:4217` to the linker to suppress this warning.
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#### Changed
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- Forbade cloning or destroying `secp256k1_context_static`. Create a new context instead of cloning the static context. (If this change breaks your code, your code is probably wrong.)
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- Forbade randomizing (copies of) `secp256k1_context_static`. Randomizing a copy of `secp256k1_context_static` did not have any effect and did not provide defense-in-depth protection against side-channel attacks. Create a new context if you want to benefit from randomization.
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#### Removed
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- Removed the configuration header `src/libsecp256k1-config.h`. We recommend passing flags to `./configure` to set configuration options (see `./configure --help`). If you cannot or do not want to use `./configure`, pass configuration flags such as `-DSECP256K1_ENABLE_MODULE_SCHNORRSIG` manually to the compiler (see the file `configure.ac` for supported flags).
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## [0.2.0] - 2022-12-12
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#### Added
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- Added usage examples for common use cases in a new `examples/` directory.
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- Added `secp256k1_selftest`, to be used in conjunction with `secp256k1_context_static`.
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- Added support for 128-bit wide multiplication on MSVC for x86_64 and arm64, giving roughly a 20% speedup on those platforms.
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#### Changed
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- Enabled modules `schnorrsig`, `extrakeys` and `ecdh` by default in `./configure`.
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- The `secp256k1_nonce_function_rfc6979` nonce function, used by default by `secp256k1_ecdsa_sign`, now reduces the message hash modulo the group order to match the specification. This only affects improper use of ECDSA signing API.
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#### Deprecated
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- Deprecated context flags `SECP256K1_CONTEXT_VERIFY` and `SECP256K1_CONTEXT_SIGN`. Use `SECP256K1_CONTEXT_NONE` instead.
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- Renamed `secp256k1_context_no_precomp` to `secp256k1_context_static`.
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- Module `schnorrsig`: renamed `secp256k1_schnorrsig_sign` to `secp256k1_schnorrsig_sign32`.
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#### ABI Compatibility
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Since this is the first release, we do not compare application binary interfaces.
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However, there are earlier unreleased versions of libsecp256k1 that are *not* ABI compatible with this version.
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## [0.1.0] - 2013-03-05 to 2021-12-25
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This version was in fact never released.
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The number was given by the build system since the introduction of autotools in Jan 2014 (ea0fe5a5bf0c04f9cc955b2966b614f5f378c6f6).
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Therefore, this version number does not uniquely identify a set of source files.
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[unreleased]: https://github.com/bitcoin-core/secp256k1/compare/v0.2.0...HEAD
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[0.2.0]: https://github.com/bitcoin-core/secp256k1/compare/423b6d19d373f1224fd671a982584d7e7900bc93..v0.2.0
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[0.1.0]: https://github.com/bitcoin-core/secp256k1/commit/423b6d19d373f1224fd671a982584d7e7900bc93
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