Function silc_channel_key_payload_encode
SYNOPSIS
SilcBuffer silc_channel_key_payload_encode(uint16 id_len,
unsigned char *id,
uint16 cipher_len,
unsigned char *cipher,
uint16 key_len,
unsigned char *key);
DESCRIPTION
Encodes channel key payload into a buffer and returns it. This is used
to add channel key payload into a packet.