I was recently playing around with OpenSSL's EC_KEY interface, specifically
generating and examining keys generated using the curve sect233r1, when I
decided to print the raw key out, in hex form. A quick analysis showed me
that the key was stored in 232 bits, not 233 bits as the curve sect233r1
requires - in fact, no matter how many keys I generated and checked this
way, I was always missing a bit. Is there some reason that OpenSSL uses only
232 bits instead of the full 233? 

In case it matters, I am using version 1.0.0d on Windows XP.
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