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ESPER features

• Both transport and tunnel modes
• Supported algorithms:
  • AES-GCM-16 with 128/256-bit key (aes-gcm-16, aes-gcm-16-esn)
  • GOST 34.12-2015 128/64-bit (Kuznechik/Magma), also with MAC-only mode (gost, gost-esn, gost-mac, gost-mac-esn, algorithm depends on provided key’s size)
• ESN (extended sequence number) support
• TFC (traffic flow confidentiality) support in tunnel mode
• setkey-like commands for SA and SP management
• Ability to filter outgoing traffic based on address+network mask, protocol identifier, port number (TCP, UDP only)
• Variable replay protection window width
• Optional ability to work with PCAP files, instead of real-time traffic processing