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When verifying an existing encrypted string you should use the encrypted text as the salt (like "crypt($plain, $crypted) eq $crypted"). This allows your code to work with the standard "crypt" and with more exotic implementations.
$foo = new Apache::Htpasswd({passwdFile => "path-to-file", ReadOnly => 1} ); # Check that a password is correct $pwdFile->htCheckPassword("zog", "password");