CHANGELOG.md

0.22.1 - 2022-03-10

• Reintroduce accidentally removed possibility to create SharedSecret from byte serialization

0.22.0 - 2022-03-08

• Disable bitcoin_hashes/std by default; add bitcoin-hashes-std feature to re-enable it
• Rename more schnorrsig methods to schnorr
• Obfuscate SharedSecret string serialization
• Simplify SharedSecret API to use a 32-byte buffer; users of custom hashes should now use bare arrays rather than this type.
• Change serde serialization of Parity from i32 to u8; clean up error handling

0.21.3 - 2022-01-31

• Several documentation improvements (#366, #365, #373, #381, #369, #389, #391, #397, #399, #340)
• Deprecate the generate_schnorrsig_keypair method (unclear value)
• Add serde traits to KeyPair
• Redo the API of the new Parity type to more clearly match our desired semantics; the From<i32> impl on this type is now deprecated. Also #400.
• Randomize the global context on creation when possible; weaken global-context-less-secure feature accordingly.
• Improve the global context API
• Fix the Debug impl for RecoverableSignature
• Implement LowerHex and Display

0.21.0 - 2022-01-02

• Fix KeyPair::from_seckey_slice error return value
• Reduce the lowmemory precomp table size
• Add KeyPair::serialize_sec
• Increase bitcoin_hashes version to 0.10; rename secp256k1::bitcoin_hashes module to secp256k1::hashes to align with bitcoin crate naming
• Add new error variant for PublicKey::combine_keys
• Change Display and Debug for secret keys to only output a truncated hash
• Improve documentation
• Implement Hash for schnorrsig::Signature
• Refactor modules to put Schnorr and ECDSA on more equal footing
• Add serde traits for KeyPair type
• Fix context bound requirements for a few methods
• Add a static immutable-zero aligned type
• Change tweak_add_assign and tweak_add_check to use an opaque Parity type rather than a boolean

0.20.3 - 2021-06-10

• Fix SecretKey validation in from_str
• Add global-context-less-secure feature which creates a non-randomized global context (and does not require rand or std)
• Add schnorrsig::KeyPair::from_secret_key convenience function
• Add combine_keys function to PublicKey
• Reduce symbol visibility in C compilation to allow LTO to work
• Add alloc feature requiring rustc 1.36+ to enable context creation without std
• Rewrite stubbed-out-for-fuzzing version of the library to improve fuzzer accessibility

0.20.2 - 2021-04-27

• Fix some WASM build issues
• Add some missing #derives to Error
• Add serde support for Schnorr signatures and for deserializing from owned types

0.20.0 - 2020-12-21

• remove ffi::PublicKey::blank and replace with unsafe ffi::PublicKey::new and ffi::PublicKey::from_array_unchecked; similar for all other FFI types
• support wasm32-wasi target
• make the global-context feature depend on the rand-std feature
• add a lexicographic ordering to PublicKey which does not match the ordering used by Bitcoin Core (matching this would be impossible as it requires tracking a compressedness flag, which libsecp256k1 does not have)
• implement BIP340 Schnorr signatures
• require use of new AlignedType in preallocated-context API to enforce alignment requirements; previously it was possible to get UB by using misaligned memory stores
• enforce correct alignment when using preallocated context API
• stop using cargo features for dangerous build-breaking options, require setting RUSTFLAGS instead
• implement low-R signing and function to grind even smaller signatures
• remove endomorphism feature, following upstream in enabling it by default

0.19.0 - 2020-08-27

• Update MSRV to 1.29.0

0.18.0 - 2020-08-26

• Add feature-gated bitcoin_hashes dependency and ThirtyTwoByteHash trait
• Add feature-gated global static context
• Allow all-zero messages to be constructed
• Bump rust-secp-sys to 0.2.0

0.17.2

• Fix linking in the fuzztarget feature.

0.17.1

• Correctly prefix the secp256k1-sys links field in Cargo.toml.

0.17.0

• Move FFI into secp256k1-sys crate.
• Add external-symbols feature for not building upstream.
• Add functions to create a context from a raw pointer.
• Support passing custom hash functions to ECDH.
• Wrap Secp256k1 from raw context in a ManuallyDrop.

0.15.4 - 2019-09-06

• Add rand-std feature.
• Pin the cc build-dep version to < 1.0.42 to remain compatible with rustc 1.22.0.
• Changed all as_*ptr() to a new safer CPtr trait

0.15.2 - 2019-08-08

• Add feature lowmemory that reduces the EC mult window size to require significantly less memory for the validation context (~680B instead of ~520kB), at the cost of slower validation. It does not affect the speed of signing, nor the size of the signing context.

0.15.0 - 2019-07-25

• Implement hex human-readable serde for PublicKey
• Implement fmt::LowerHex for SecretKey and PublicKey
• Relax cc dependency requirements
• Add links manifest key to prevent cross-version linkage

0.14.1 - 2019-07-14

• Implemented FFI functions: secp256k1_context_create and secp256k1_context_destroy in rust.

0.14.0 - 2019-07-08

• Feature-gate endormorphism optimization because of a lack of clarity with respect to patents
• Got full no-std support including eliminating all use of libc in C bindings. PR 1 PR 2. This library should be usable in bare-metal environments and with rust-wasm. Thanks to Elichai Turkel for driving this forward!
• Update upstream libsecp256k1 version to 143dc6e9ee31852a60321b23eea407d2006171da

0.13.0 - 2019-05-21

• Update minimum supported rust compiler 1.22.
• Replace serialize_der function with SerializedSignature struct.
• Allow building without a standard library (no_std). std feature is on by default.
• Add human readable serialization to Signatures and SecretKeys.
• Stop displaying 0 bytes if a Signature is less than 72 bytes.
• Only compile recovery module if feature recovery is set (non-default).
• Update rand dependency from 0.4 to 0.6 and add rand_core 0.4 dependency.
• Relax cc dependency requirements.

0.12.2 - 2019-01-18

• Fuzzer bug fix

0.12.1 - 2019-01-15

• Minor bug fixes
• Fixed cc crate version to maintain minimum compiler version without breakage
• Removed libc dependency as it our uses have been subsumed into stdlib

0.12.0 - 2018-12-03

• Overhaul API to remove context object when no precomputation is needed
• Add ThirtyTwoByteHash trait which allows infallible conversions to Messages
• Disallow 0-valued Message objects since signatures on them are forgeable for all keys
• Remove ops::Index implementations for Signature
• Remove depecated constants and unsafe ZERO_KEY constant

0.11.5 - 2018-11-09

• Use pub extern crate to export dependencies whose types are exported

0.11.4 - 2018-11-04

• Add FromStr and Display for Signature and both key types
• Fix build.rs for Windows and rustfmt configuration for docs.rs
• Correct endianness issue for Signature Debug output

0.11.3 - 2018-10-28

• No changes, just fixed docs.rs configuration

0.11.2 - 2018-09-11

• Correct endianness issue in RFC6979 nonce generation

0.11.1 - 2018-08-22

• Put PublicKey::combine back because it is currently needed to implement Lightning BOLT 3

0.11.0 - 2018-08-22

• Update rand to 0.4 and gcc 0.3 to cc 1.0. (rand 0.5 exists but has a lot of breaking changes and no longer compiles with 1.14.0.)
• Remove PublicKey::combine from API since it cannot be used with anything else in the API
• Detect whether 64-bit compilation is possible, and do it if we can (big performance improvement)

0.10.0 - 2018-07-25

• A complete API overhaul to move many runtime errors into compiletime errors
• Update libsecp256k1 to 1e6f1f5ad5e7f1e3ef79313ec02023902bf8. Should be no visible changes.
• Remove PublicKey::new() and PublicKey::is_valid() since new was unsafe and it should now be impossible to create invalid PublicKey objects through the API
• Reintroduce serde support behind a feature gate using serde 1.0
• Clean up build process and various typos