flutter_eddsa 0.2.0

Flutter FFI plugin for Ed25519 digital signatures and X25519 Diffie-Hellman key exchange. High-performance Curve25519 cryptography via native C.

0.2.0

Breaking changes — secret inputs are now SecretKey instead of Uint8List.

• New SecretKey class: secrets held in malloc'd native memory, never on the Dart GC heap. dispose() zeros the buffer before freeing. A NativeFinalizer frees (but does not zero) on GC if dispose is forgotten.
• Ed25519.derivePublicKey, signMessage, generateX25519PublicKey, scalarMultiply now accept SecretKey for the secret argument.
• Ed25519.diffieHellman and secretKeyToX25519 now return SecretKey (the shared secret and converted key are sensitive — caller must dispose).
• Secret bytes are passed to FFI via a direct native pointer — no arena copy of secret material, eliminating the free-without-zero gap.
• All assert() guards replaced with ArgumentError / StateError so validation fires in release mode.
• New EddsaUtils.zero(Uint8List) — best-effort heap wipe for the brief window when secrets pass through a Uint8List (e.g. after SecretKey.fromBytes).
• Added topics: to pubspec.yaml for pub.dev discoverability.
• README: new SecretKey usage section, updated API table, expanded security notes listing the 5 things users must still do themselves.

0.1.1

• Fixed pub.dev Example tab: replaced example/example.dart with example/example.md so the simple snippet takes priority over the full demo app (example/lib/main.dart).
• Updated installation version constraint in README to ^0.1.0.

0.1.0

• Added example/example.dart: a minimal, copy-pastable snippet shown in the pub.dev Example tab, covering keypair generation, Ed25519 sign/verify, and X25519 Diffie-Hellman key exchange.

0.0.9

• Rewrote example app: step-by-step interactive demo covering key generation, Ed25519 signing, signature verification (including tamper detection), and X25519 Diffie-Hellman key exchange. All key and signature values are selectable and copyable.
• Added educational "color metaphor" page showing how DH key exchange works visually, accessible via the info button in the demo app.
• Added pub.dev version and pub points badges to README.
• Fixed installation snippet version constraint in README.

0.0.5

• Removed EddsaUtils.bytesFromString and EddsaUtils.stringFromBytes — not needed for cryptographic operations. Use dart:convert's utf8.encode/utf8.decode for text encoding.

0.0.4

• Relicensed from GPL-3.0 to MIT.

0.0.3

• Fixed license.

0.0.2

• Improved README: added Diffie-Hellman concept explanation with ASCII diagram and KDF note.
• Replaced example app with a focused Diffie-Hellman demo for pub.dev Example tab.

0.0.1

• Initial release.
• Ed25519 digital signatures: key derivation, signing, and verification.
• X25519 Diffie-Hellman key exchange.
• Ed25519 ↔ X25519 key conversion for both public and secret keys.
• Cryptographically secure random key generation via Random.secure().
• Native FFI implementation — no platform-channel overhead.
• Supports Android, iOS, macOS, Linux, and Windows.