AzelusLightvale-ComfyUI-ARG-Toolkit/web/docs/XPublicKeyFormat.md

ECDH Public Key Bytes

Serializes an X25519 or X448 public key.

Source library: cryptography

Overview

This node extracts the public key from an X25519/X448 private key and serializes it into bytes. Public keys are used in Diffie-Hellman key exchange to derive a shared secret between two parties.

Parameters

• key_source: How to obtain the private key.
  • Fresh Key: Generates a new random private key.
  • From Private Bytes: Uses a previously serialized private key.
• key_type: The curve (x25519 or x448).
• encoding: The encoding format (PEM or DER).
• formatting: The key format.
  • SubjectPublicKeyInfo: The standard X.509 format.
  • Raw: The raw key bytes (32 bytes for x25519, 56 bytes for x448).
• private_key: (Optional) The serialized private key bytes. Required when key_source is "From Private Bytes".

Outputs

• public_bytes: The serialized public key as a BYTESLIKE object.
• public_key: The public key object (KEYOBJ), which can be passed to the ECDH Shared Key Exchange node.

Additional Considerations

• Public keys are not secret and can be freely shared. They are used only for key exchange.
• The Raw format produces the smallest representation (32 bytes for x25519), which is the format expected by the XExchange node.