CLASS2.SECURITY
Level II security related events.
VSCP2_TYPE_SECURITY_GENERAL
VSCP2_TYPE_SECURITY_SETKEY
Set encryption key for a node. The payload data is encrypted from byte 1 to the payload length. The first first byte holds the encryption code as of the definition in the VSCP specification (and vscp.h).
Encrypted content is encrypted with AES128/AES192/AES256 CBC. The encrypted content is sent with a 16-byte IV appended to it meaning that the actual payload can be max 479 bytes (512-16 (GUID)-1 (type)-16 (IV)).
| Byte | Description |
|---|---|
| 0 | Encryption code in low nibble. High nibble is reserved for future use. |
| 1 | Reserved for future use. |
| 2-17 | GUID for node that the key is intended for. (All zero GUID is all nodes.) |
| 18-511 | Key (any length) + (16 byte) iv. |
Note that key length is application/protocol dependent.
| Code | Description |
|---|---|
| 0 | No encryption |
| 1 | AES-128 |
| 2 | AES-192 |
| 3 | AES-256 |
| 4-254 | Reserved |
| 255 | User defined encryption |