Virgin import of ntpd 4.0.98f

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diff --git a/contrib/ntp/README.des b/contrib/ntp/README.des
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+If you want DES support in ntp:
+
+- Use MD5 instead:
+- - convert your DES keys to MD5 by changing the 'A', 'N' or 'S' to 'M'
+
+If you *need* DES support:
+
+- first see if you can simply "want" DES support instead
+- Get RSAREF or RSAEURO (or a reasonable facsimile thereof)
+- - Unpack it in the top-level source directory of the NTP distribution
+    (You should see directories like ports, rsaref2, scripts)
+
+When you run configure, the Right Thing will happen.
+
+Be advised that the RSA DES code is not quite as portable os one might
+wish for.  In particular, DES under NTP will only work between machines
+of the same "endianness".
+
+Dave would prefer that new/alternative encryption schemes follow the
+RSA API.