I have received both public and private keys from business and they are of type RSA-4096 with .ASC extension. The keys are generated by the business using a tool called GPG Keychain on a Mac machine. The keys are deployed on the server in the standard path - /usr/sap/<System ID>/<Instance ID>/sec
When I use them to encrypt the file, the encryption works fine but when I use the keys to decrypt the files, it fails in PI with the error:
com.sap.aii.af.lib.mp.module.ModuleException: File is no valid PGP Message, could not apply decryption.
The decryption is working fine in the tool but it is not working fine in SAP PI. Even a simple encrypted txt file (of extension .pgp) is failing with the above error. The configuration of the module is shown below in the snapshot: