LoginHandshakeRequest (0xA101)

This is the first packet sent by either party, and is sent when the client first connects to the login server. This packet is responsible for providing an RSA public key to the client, which will later be used to encrypt an AES payload.

Payload

Data type	Name	Description
u8	encryptionMode	The encryption mode to use. This is not used in the protocol, and is always set to 0.
u8	exponentLen	The length (in bytes) of the RSA public exponent.
u8	modulusLen	The length (in bytes) of the RSA modulus.
i8[64]	exponent	The public exponent bytes, in little-endian order. This must always be padded to fill the 64 bytes requirement.
i8[128]	modulus	The modulus bytes, in little-endian order.