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OpenSSL-SSH - Modernization for Ruby 3.x / OpenSSL 3.x

Parse OpenSSH format public keys (ssh-rsa AAAA...) and return OpenSSL::PKey objects.

Completed

Phase 1: Fix Core

  • Replace property assignment with ASN.1 DER construction
  • Update build_rsa method to build ASN.1 sequence
  • Update build_dsa method to use SubjectPublicKeyInfo format
  • Test with Ruby 3.x / OpenSSL 3.x
  • Update specs

Phase 2: Add Key Types

  • Ed25519 support (default for modern OpenSSH) 
    OpenSSL::PKey.new_raw_public_key('ED25519', raw_key_bytes)
  • ECDSA support (ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521)
  • Keep RSA and DSA support

Phase 3: Modernize

  • Update gemspec dependencies
    • bundler ~> 2.0
    • rake ~> 13.0
    • rspec ~> 3.12
    • simplecov ~> 0.22
    • base64 (runtime dependency for Ruby 3.4+)
  • Add required Ruby version (>= 3.0)
  • Add GitHub Actions workflow
  • Update metadata URIs

Future Improvements

Phase 4: OpenSSH Private Key Format

  • Support OpenSSH private key format (new format, not just PEM)
    • Ed25519 and ECDSA private keys use new format by default
    • Requires custom parser for -----BEGIN OPENSSH PRIVATE KEY-----
  • Add fingerprint generation (MD5, SHA256)
  • Add key comment extraction
  • Better error messages

Supported Key Types

Type Public Key Private Key (PEM) Private Key (OpenSSH)
RSA ✅ ✅ ❌
DSA ✅ ✅ ❌
Ed25519 ✅ N/A ❌ (pending)
ECDSA ✅ ✅ ❌ (pending)

References