@cipherstash/protect-dynamodb funcs to support more configurable naming conventions #148
Description
The encryption/decryption funcs here currently expect the HMAC attr (for search) to be suffixed with __hmac and for the source ciphertext (for decryption) to be suffixed with __source.
We might want to allow users to provide names for these. For example, someone might want to name the attr sk if it's used in a search key.
Similarly, we might want to add more flexibility around the key structure. Right now the value of the HMAC field is just the HMAC, but we might want to allow users to prefix their keys (e.g. add EMAIL# in front of the HMAC).
Originally posted by @CDThomas in #134 (comment)