Go ECH Key Generator

This Go project generates Encrypted ClientHello (ECH) key and configuration PEM files according to https://datatracker.ietf.org/doc/draft-farrell-tls-pemesni/

Installation

1. Clone the repository:

   git clone https://github.com/LeonardWalter/echGenerator.git
   cd echGenerator

2. Build the executable:

   go build
   ./echGenerator -s example.com -i 123 -o mykeys.pem

Usage

-s: Server name (required).
-i: ECH ID (uint8). If not provided, a random ID will be generated.
-o: Output file name. If not provided, the output file will be <server_name>.pem.ech
-h: Show help.

Example output:

-----BEGIN PRIVATE KEY-----
MC4CAQAwBQYDK2VuBCIEIG7Wc0oeswNKlNMfNe+gSwaFhVU3GDdoSAzfZGDpSaIm
-----END PRIVATE KEY-----
-----BEGIN ECHCONFIG-----
AEb+DQBCFQAgACAfYnXA4GJHffFuchf/+AMUNodczfzPy8RLtVOjFs7FZwAMAAEAAQABAAIAAQADIAtleGFtcGxlLmNvbQAA
-----END ECHCONFIG-----