How to use Encryption Services Public API in a custom plugin

In one of our requirements, we need to decrypt the encrypted text stored via a!encryptedtextfield. To achieve this I am planning to build an Appian plugin using Appian’s public API: Encryption Services (forum.appian.com/.../EncryptionService.html ).

Encryption Service API provides encrypt and decrypt functions, however as the EncryptionService is itself an Interface, I am not sure how to use the abstract encrypt or decrypt functions in my plugin.

Can anyone please suggest me a way to achieve this or point out where I am going wrong?

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