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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.8.1 Secure Channel Handshake
  Server Keys from Keying Material Name Offset Length ServerSigningKey 0 DerivedSignatureKeyLength ServerEncryptingKey DerivedSignatureKeyLength EncryptionKeyLength ServerInitializationVector DerivedSignatureKeyLength + EncryptionKeyLength InitializationVectorLength The SymmetricEncryptionAlgorithm for the SecurityPolicy sets the DerivedSignatureKeyLength, the EncryptionKeyLength and InitializationVectorLength ... InitializationVector is required for each MessageChunk . This value is constructed from the ClientInitializationVector or ServerInitializationVector where the first 8 bytes are XORed with the values in Table 69 encoded