Encrypt/decrypt data from or for other parties using PGP with keys

Related products: Software Factory Indicium Service Tier

We receive encytpted data from our partners and want to send them encrypted data.
The data is put on a  sftp site or can be reached using an api. We use PGP with a public and a private key.

We would like to use a proces flow to get data and encrypt the data or encrypt the data and post it.
For this we should be able to define which encrypting method is used and the keys needed for this method. 
This is not possible with the current DECRYPT and ENCRYPT process flow actions.

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