The algorithm and nonce length used of the UADP NetworkMessage security depend on the selected SecurityPolicy. They are defined by SymmetricPubSubEncryptionAlgorithm and SymmetricPubSubNonceLength.
The keys used to encrypt and sign messages are returned from the GetSecurityKeys method (see 8.4). This Method returns a sequence of random data with a length that depends on the SecurityPolicyUri, which is also returned by the Method. The layout of the random data is defined in Table 74.
Table 74 – Layout of the key data for UADP message security
|
Name |
Type |
Description |
|
SigningKey |
Byte [SymmetricSignatureAlgorithm Key Length] |
Signing key part of the key data returned from GetSecurityKeys. The SymmetricSignatureAlgorithm is defined in the SecurityPolicy. |
|
EncryptingKey |
Byte [SymmetricEncryptionAlgorithm KeyLength] |
Encryption key part of the key data returned from GetSecurityKeys. The SymmetricEncryptionAlgorithm is defined in the SecurityPolicy. |
|
KeyNonce |
Byte [SymmetricPubSubNonceLength] |
Nonce part of the key data returned from GetSecurityKeys. |