Crypto.DecryptBlock
This command decrypts an 8-Byte data block given in the
Block parameter using the SkipJack algorithm. If
KeyIndex is set to 0x00, KeyValue will be used as
encryption key. Otherwise, KeyIndex is interpreted as
the index of the corresponding entry in the internal key list.
KeyIndex = 0x01 denotes configuration value 0x81,
KeyIndex = 0x02 denotes configuration value 0x82, etc.
Parameters (request frame)
|
Name
|
Type/Size
|
Description
|
|
KeyIndex
|
Integer (8 bits)
|
Index of key to use to decrypt data. KeyIndex
must be set to 0x00 if a user-defined key,
specified in the KeyValue parameter,
should be used for decryption.
|
|
Optional field, condition:
KeyIndex == 0
|
|
KeyValue
|
Raw data (length 10 Bytes)
|
If KeyIndex is set to 0x00, this value
specifies a user-defined decryption key.
|
|
Block
|
Raw data (length 8 Bytes)
|
Data block to decrypt.
|
Returned values (response frame)
|
Name
|
Type/Size
|
Description
|
|
UnencryptedBlock
|
Raw data (length 8 Bytes)
|
Unencrypted data block after decryption.
|
