Calculate checksum in BizTalk Orchestration Expression shape

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In an orchestration I need to find out if I already processed a message before and,if so, I must ignore it for further processing. I thought I might be able to calculate checksom on the message to get a unique value, like an MD5 checksum.

How can I easily trigger such calculation for a message in an orchestration?

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Solution was to create a helper class with checksum calculation, also for storing and comparing checksums.