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Scope: Core (OPC-10000-*) All specs

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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)

sender shall first calculate the maximum amount of space available in the MessageChunk (called MaxBodySize ) using the following formula: MaxBodySize = PlainTextBlockSize * Floor ((MessageChunkSize - MessageHeaderSize - SecurityHeaderSize - SignatureSize - 1)/CipherTextBlockSize) - SequenceHeaderSize ... into a single chunk if BytesToWrite is less than or equal to the MaxBodySize . In this case the PaddingSize is calculated with this formula: PaddingSize = PlainTextBlockSize - ((BytesToWrite + SignatureSize + 1) % PlainTextBlockSize