chore: create changelog for 0.3.0

CHANGELOG.md

@@ -0,0 +1,46 @@
+# Changelog
+
+## [0.3.0][0.3.0]
+
+Changes for library users since `0.2.1`.
+
+### Added
+
+- Added FIDO2 / Security Key authentication helpers for
+  `sk-ssh-ed25519@openssh.com` and `sk-ecdsa-sha2-nistp256@openssh.com` keys
+  in the new `org.connectbot.sshlib.sk` package. The library handles the SSH
+  wire-format pieces while callers provide their own CTAP2 transport.
+- Added `AuthHandler.onBanner(message)` so applications can display
+  `SSH_MSG_USERAUTH_BANNER` messages during authentication.
+- Added `KtorTcpTransport.getLocalAddress()` to expose the local socket address
+  assigned to a connected TCP transport.
+- Added `docs/ALGORITHMS.md` with the complete supported algorithm list and
+  `docs/SK_AUTH.md` with Security Key authentication guidance.
+
+### Changed
+
+- `SshClient(...)` and `BlockingSshClient(...)` convenience constructors now
+  require an explicit `HostKeyVerifier`. This makes host-key verification a
+  required caller decision instead of allowing a convenience constructor that
+  could not build a valid `SshClientConfig`.
+- `AuthHandler.onSignatureRequest()` is documented as a verbatim signature
+  extension point for local private keys, SSH agents, and FIDO2 authenticators.
+
+### Fixed
+
+- Authentication banners are now delivered to callers during every authentication
+  step instead of only being logged.
+- `SshSigning.sign()` now rejects `sk-*` algorithms with an actionable error,
+  since Security Key private material lives on the authenticator and must be
+  signed through `AuthHandler.onSignatureRequest()`.
+- Hardened host-key signature verification by requiring the signature algorithm
+  to match the negotiated host-key algorithm.
+- Hardened agent session-binding signature verification by requiring the
+  signature algorithm to be compatible with the key type.
+- Hardened key exchange and channel handling by rejecting all-zero ECDH shared
+  secrets, invalid DH group-exchange parameters, channel-window overflows, and
+  incoming channel data that exceeds the local receive window.
+- Limited zlib decompression output per packet to reduce decompression-bomb
+  denial-of-service risk.
+
+[0.3.0]: https://github.com/connectbot/cbssh/compare/v0.2.1...v0.3.0