Unknown hash algorithm message is very unhelpful

After I eventually discovered that Steam adds a space at the end of a paragraph in the profile description box (resulting in an invalid `Hash: SHA512[space]`), I figured out the problem but your error message from `/verify` is very unhelpful


Start at the /verify endpoint and reproduce the invalid `Hash: SHA512[space]` input described in the issue. Trace the resulting error message and improve it so the invalid hash algorithm value and likely trailing whitespace are understandable, then verify the response for this case.

Written by the indexing model from the issue text.