An updated ntp package that fixes one bug is now available for Red Hat Enterprise Linux 5.
The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time source. This package includes the ntpd daemon which continuously adjusts system time and utilities used to query and configure the ntpd daemon.
The ntp-keygen utility always used the DES-CBC (Data Encryption Standard-Cipher Block Chaining) encryption algorithm to encrypt private NTP keys. This algorithm is not supported in FIPS (Federal Information Processing Standard) mode. As a consequence, ntp-keygen generated empty private keys when it was used on systems with FIPS mode enabled. To solve this problem, a new "-C" option has been added for ntp-keygen that allows for selection of an encryption algorithm for private key files. Private NTP keys are now generated as expected on systems with FIPS mode enabled.
All users of ntp are advised to upgrade to this updated package, which fixes this bug.