✨ Revolutionary Changes - Complete PASETO Migration #

This is a complete rewrite of the licensify library. The entire cryptographic foundation has been rebuilt from the ground up.

🚀 New Features

• PASETO v4.public Implementation: Complete migration to PASETO tokens using Ed25519 signatures
• Modern Cryptography: Replaced all legacy RSA/ECDSA with Ed25519 + BLAKE2b
• PasetoLicenseGenerator: New license generator using PASETO v4.public tokens
• PasetoLicenseValidator: New validator with tamper-proof signature verification
• Real Ed25519 Key Generation: Powered by the cryptography package
• Zero Legacy Dependencies: Removed PointyCastle, asn1lib, and crypto packages
• Performance Boost: Ed25519 operations ~10x faster than previous ECDSA implementation
• Compact Tokens: PASETO tokens are smaller and more efficient
• Type-Safe API: Complete Dart type safety throughout the new architecture

💥 Breaking Changes

• COMPLETE API REWRITE: All previous classes and methods have been replaced
• RSA/ECDSA REMOVED: No longer supported - generate new Ed25519 keys
• License Format Changed: Existing licenses cannot be validated - re-issue required
• Dependencies Changed: New cryptographic dependencies (cryptography, paseto_dart)
• CLI Temporarily Disabled: Will be restored in future versions

🔄 Migration Required

Old (v2.x) → New (v3.x)

// OLD - No longer works
final keyPair = EcdsaKeyGenerator.generateKeyPairAsPem(curve: EcCurve.p256);
final generator = keyPair.privateKey.licenseGenerator;
final license = generator(appId: 'app', expirationDate: date);

// NEW - PASETO v4
final keyPair = await Ed25519KeyGenerator.generateKeyPair();
final generator = PasetoLicenseGenerator(privateKey: keyPair.privateKey);
final license = await generator.generateLicense(
  licenseData: {'app': 'myapp'}, 
  expirationDate: date
);

⚡ Performance Improvements

• Key Generation: ~39ms per Ed25519 key pair (vs ~100ms+ for ECDSA)
• License Generation: ~6.6ms per license
• License Validation: ~9.9ms per validation
• Throughput: ~151 licenses/second total throughput
• Token Size: ~734 characters (compact and efficient)

🛡️ Security Enhancements

• Quantum-Resistant Foundation: Ed25519 provides better long-term security
• No Algorithm Confusion: PASETO v4 fixes algorithms, preventing downgrade attacks
• Tamper-Proof Tokens: PASETO provides built-in integrity protection
• Modern Standards: Follows latest cryptographic best practices

Added #

• Support for importing ECDSA keys from base64 parameters
• Support for importing ECDSA keys from raw parameters
• EcdsaParamsConverter utility for converting parameters to PEM format
• Methods for importing ECDSA public keys from x, y coordinates and curve name
• Methods for importing ECDSA private keys from scalar (d) value and curve name

Deprecated #

• RSA for all cryptographic operations except key generation

Added #

• ECDSA key generation support as an alternative to RSA
• Utilities for comparing and choosing between RSA and ECDSA

Fixed #

• Performance improvements in key operations
• Better error handling for unsupported operations

Added #

• Initial release with RSA-based license generation and validation
• Basic CLI tool
• License request/response workflow

Note: All versions prior to 3.0.0 are considered legacy and are no longer supported. Please upgrade to 3.0.0+ for PASETO-based modern cryptographic security.