Go DTLS 1.2 implementation. The original user is pion-WebRTC, but we would love to see it work for everyone.

A long term goal is a professional security review, and maye inclusion in stdlib.

This will only be targeting DTLS 1.2, and the most modern/common cipher suites. We would love contributes that fall under the 'Planned Features' and fixing any bugs!

• DTLS 1.2 Client/Server
• Key Exchange via ECDHE(curve25519, nistp256, nistp384) and PSK
• Packet loss and re-ordering is handled during handshaking
• Key export (RFC 5705)
• Serialization and Resumption of sessions
• Extended Master Secret extension (RFC 7627)

• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (RFC 5289)
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (RFC 5289)
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (RFC 8422)
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (RFC 8422)

• TLS_PSK_WITH_AES_128_CCM_8 (RFC 6655)
• TLS_PSK_WITH_AES_128_GCM_SHA256 (RFC 5487)

• Chacha20Poly1305

• DTLS 1.0
• Renegotiation
• Compression

For a DTLS 1.2 Server that listens on 127.0.0.1:4444

go run examples/listen/main.go

For a DTLS 1.2 Client that connects to 127.0.0.1:4444

go run examples/dial/main.go

Pion DTLS can connect to itself and OpenSSL.

  // Generate a certificate
  openssl ecparam -out key.pem -name prime256v1 -genkey
  openssl req -new -sha256 -key key.pem -out server.csr
  openssl x509 -req -sha256 -days 365 -in server.csr -signkey key.pem -out cert.pem

  // Use with examples/dial/main.go
  openssl s_server -dtls1_2 -cert cert.pem -key key.pem -accept 4444

  // Use with examples/listen/main.go
  openssl s_client -dtls1_2 -connect 127.0.0.1:4444 -debug -cert cert.pem -key key.pem

Pion DTLS also comes with examples that do key exchange via PSK

go run examples/listen-psk/main.go

go run examples/dial-psk/main.go

  // Use with examples/dial-psk/main.go
  openssl s_server -dtls1_2 -accept 4444 -nocert -psk abc123 -cipher PSK-AES128-CCM8

  // Use with examples/listen-psk/main.go
  openssl s_client -dtls1_2 -connect 127.0.0.1:4444 -psk abc123 -cipher PSK-AES128-CCM8

Check out the contributing wiki to join the group of amazing people making this project possible:

• Sean DuBois - Original Author
• Michiel De Backker - Public API
• Chris Hiszpanski - Support Signature Algorithms Extension
• Iñigo Garcia Olaizola - Serialization & resumption, cert verification
• Daniele Sluijters - AES-CCM support
• Jin Lei - Logging
• Hugo Arregui
• Lander Noterman
• Aleksandr Razumov - Fuzzing
• Ryan Gordon

MIT License - see LICENSE for full text