Yum Fails In FIPS Mode

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I guess my Google-fu wasn’t up to this one!

I have a system running CentOS 5.9 32-bit running in FIPS mode that I
would like to update. Unfortunately, it fails when attempting to run
“yum update”. I’ve disabled all the repositories except for base and updates and still get the same issue, an error carping about an algorithm forbidden by FIPS. Here’s what I see:

My searches seem to indicate that FIPS doesn’t like MD5, which I thought was pretty much essential to verifying the packages, but I saw no documented work-arounds.

I’ve done a “yum clean all” (at least THAT works!) and it had no effect.
I get the same error on “yum repolist”, just in case you were wondering. Grasping at other straws, I checked the system time, which is correct (using NTP anyway).

Anybody got any ideas about how to work around this? I would really rather NOT reboot in non-FIPS mode to update the system, then reboot in FIPS mode, but if that’s the only solution that’s what I’ll do.