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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.2.5.1 Encryption other than Authenticated Symmetric Encryption (AEAD)
  amount of space available in the MessageChunk (called MaxBodySize ) using the following formula: MaxBodySize = PlainTextBlockSize * Floor ((MessageChunkSize - MessageHeaderSize - SecurityHeaderSize - SignatureSize - 1)/CipherTextBlockSize) - SequenceHeaderSize; The MessageHeaderSize is 12 bytes ... SequenceHeaderSize is always 8 bytes. During encryption, a block with a size equal to PlainTextBlockSize is processed to produce a block with size equal to CipherTextBlockSize . These values depend