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From Simon Elliston Ball <>
Subject Re: HMAC key storage?
Date Sun, 18 Dec 2016 10:19:26 GMT
This sounds like a job for sensitive properties to me. If you create a property on your custom
processor and mark it with .senstive(true) in your builder, then the value stored in the flow
conf will be available as a regular property, but encrypted on disk with a key specified in
the See
for an example of how this works. 


> On 18 Dec 2016, at 09:32, Jonathan Telfer <> wrote:
> Hi all
> I'm currently writing a custom processor to access a non standard messaging protocol.
The protocol requires each call to contain an authorization header signed by a sha256 hmac.

> I'm using commons HmacUtils to generate the signature, but I need advice on the best
way to store the secret key and make it available to the processor. 
> Thanks.

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