Better error messaging when no keyring is found.

Currently if no configured keyring is found to unwrap any of the encrypted data keys, the CMM will throw an unencryptedDataKey has not been set error. While this error is accurate, it is unhelpful.

[bardock]

I was using the same example that followed @davidyell. To avoid this error you must use the key ARN, not the alias, as was noted here: https://docs.aws.amazon.com/encryption-sdk/latest/developer-guide/js-examples.html

To specify a CMK for a decryption keyring in the AWS Encryption SDK for JavaScript, you must use the key ARN. Otherwise, the CMK is not recognized

[davidyell]

I was Googling for this error and ended up here. The message still doesn’t tell me how to fix the error or provide a link for me to learn more.