unable to add digest authentication to .htaccess

Here's my .htaccess file:

AuthType Digest
AuthName "..."
AuthDigestFile "/path/to/.htdigest"
require valid-user

Here's my .htdigest file:

test:realm:51a7159127025bca529b9d93f062dac7

I generated that with "htdigest -c test.txt realm test" and used
"user" as my password. Unfortunately, whenever I try to visit the
directory in which this .htaccess file resides I get an error 500
"Internal Server Error" error. Any ideas?

Also, AuthType Basic works just fine - just not AuthType Digest.

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