VadimGush

public static class Decoder {
  
	public void test() throws Exception {
    // AmneziaWG client key which starts with "vpn://" is just a Base64 encoded and compressed JSON configuration file
		final var encoded = "vpn://<insert your client key>".replace("vpn://", "");
    // They use Base64 URL encoder. Inside of the Base64 encoded string is a compressed data.
		final var compressed = ByteBuffer.wrap(Base64.getUrlDecoder().decode(encoded));
    // Data is compressed using QT qCompress function, which uses zlib and adds a 4 byte header to the compressed data
		final var header = new byte[4]; // The header is 32-bit unsigned integer representing the size of uncompressed data
		compressed.get(header); // This will remove 4 byte header from the buffer

VadimGush

Keybase proof

I hereby claim:

• I am vadimgush on github.
• I am vadimgush (https://keybase.io/vadimgush) on keybase.
• I have a public key ASAvDPiollJpGryY0yXyXDv0krsmPfoqVWG8NBZmuZ4rZgo

To claim this, I am signing this object: