We can drop the new CRC code in back-ldif in favor of the stronger MD5 from liblutil. They have the same speed on my host: CRC is simpler, but memory-bound. CRC guarantees to catch certain transmission errors like a few wrong bits, but this comes at the expense of its quality as a general hash function.
Or we could use a slower SHA function, but I figure MD5 is already stronger than we need.