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OPCUA asymmetric encryption
July 19, 2015
13:26, EEST
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jessepinkman
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July 19, 2015
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Hello,
In the OPCUA specification we should use an Asymmetric encryption (in my case RSA 256 oaep) to encrypt the “OpenSecureChannel request” and “OpenSecureChannel response”.
My OpenSecureChannel request/response size = 2000 octets
RSA Algorithm support bloc size of ~217 octets or something like that (RSA blocSize = RSA_Size(key) – paddingSize)

How should i do to encrypt my request and my response ???
Should i use an operation mode (CBC for example) to split my plainText into a small blocs ?? Am i respecting the specification by doing that

please, even if you don’t know the answer, any idea can be helpful !!
Thank you

July 20, 2015
6:48, EEST
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Bjarne Boström
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Hi,

I suggest that you use an existing OPC UA Stack (or SDK which are usually built on top of stacks). They have implementations of these lower level communication specifications so you don’t need to implement them yourself.

– Bjarne

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