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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.40.2.1 Overview
  SecurityPolicies are added. The EncryptedSecret format starts with a TypeId , EncodingMask and Length . These values allow a Server to determine how to handle the secret. If the TypeId does
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.40.2.2 Legacy Encrypted Token Secret Format
  before applying encryption. Table 182 - Legacy UserIdentityToken Encrypted Token Secret Format Name Type Description Length Byte [4] The length of the data to be encrypted including the ServerNonce but excluding ... length field. This field is a 4-byte unsigned integer encoded with the least significant bytes appearing first. tokenData Byte [*] The token data. serverNonce Byte [*] The last ServerNonce returned
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.40.2.3 EncryptedSecret Format
  KeyData and append the result to the common header; Update the KeyDataLength with the length of the encrypted KeyData; Append the Nonce and the Secret to the encrypted KeyData; Calculate ... blocks. The size of the encryption block depends on the encryption algorithm. The total length of the Padding, not including the PaddingSize , is encoded as a UInt16 . The individual bytes
• OPC-10000-5 – OPC Unified Architecture - Part 5: Information Model
  C.2.6 FieldType
  depending on the settings for the other attributes and the values in other fields. Length xs:unsignedInt An attribute that indicates the length of the field. This value ... string An attribute that indicates which other field in the StructuredType specifies the length of the field. The length of the field may be in bytes
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.10 Decimal
  NodeId The identifier for the Decimal DataType . Encoding Byte This value is always 1. Length Int32 The length of the Scale and Value fields in bytes. If the length ... integer representing the unscaled value. The number of bytes is the value of the Length field minus size of the Scale field. The integer is encoded with the least significant
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.6 Structures
  example above, the Y field is a pointer to an array with a length stored in NoOfY. When encoding an array, the length is part of the array encoding ... encoded. That said, encoders and decoders use NoOfY during encoding. W is a fixed length array with an implicitly defined length of 10. This length is always encoded with
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.7 Structures with optional fields
  optional (O1 and O2) fields would be encoded as a byte sequence. The length of the byte sequence depends on the available optional fields. An encoding mask field determines ... would have the encoded form shown in Table 32 and have a total length of 22 bytes. The length of the TypeId , Encoding and the Length are fields defined
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.8 Unions
  form a union. An instance of Type1 would be encoded as byte sequence. The length of the byte sequence depends on the selected field. An instance of Type1 where field ... have the encoded form shown in Table 33 and it would have a total length of 17 bytes. The TypeId , Encoding and the Length are fields defined by the ExtensionObject
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.6 Deriving keys
  represented by the following function declaration: Byte[] PRF( Byte[] secret, Byte[] seed, Int32 length, Int32 offset) Where length is the number of bytes to return and offset is a number ... specified in Table 66 . Table 66 - Cryptography key generation parameters Name Secret Seed Offset Length ClientSigningKey ServerSecret ClientSeed 0 DerivedSignatureKeyLength ClientEncryptingKey ServerSecret ClientSeed DerivedSignatureKeyLength EncryptionKeyLength ClientInitializationVector ServerSecret ClientSeed DerivedSignatureKeyLength + EncryptionKeyLength