alopresto commented on issue #3604: NIFI-6255 NIFI-6287: Hash function for expression language and record… URL: https://github.com/apache/nifi/pull/3604#issuecomment-515150258 I don't think the error has to explicitly list all the available options, but I think the docs should. The error can just reference the docs to let people know where the definitive list is. The list of supported algorithms does not change frequently, and the docs can be updated in the event the list changes. There are some examples of our current hash usage in [`HashService`](https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/security/util/crypto/HashService.java#L59) and [`HashAlgorithm`](https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/security/util/crypto/HashAlgorithm.java). I believe in the docs for `CryptographicHashContent` the possible values are enumerated even though it's a drop-down list in the processor configuration rather than a freeform text field.
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