13 lines
675 B
Markdown
13 lines
675 B
Markdown
# Packet Format
|
|
|
|
All tapir packets are fixed length (8192 bytes) with the first 2 bytes indicated the actual length of the message,
|
|
`len` bytes of data, and the rest zero padded:
|
|
|
|
| len (2 bytes) | data (len bytes) | paddding (8190-len bytes)|
|
|
|
|
Once encrypted, the entire 8192 byte data packet is encrypted using [libsodium secretbox](https://libsodium.gitbook.io/doc/secret-key_cryptography/secretbox) using the standard structure (
|
|
note in this case the actual usable size of the data packet is 8190-14 to accommodate the nonce included by secret box)
|
|
|
|
For information on how the secret key is derived see the [authentication protocol](./authentication_protocol.md)
|
|
|
|
|