The output produced by DumpPublicKey now has a version tag on each
line (ie, each key). The existing keys are retroactively dubbed
"version 1", and we add a version 2 for 2048-bit e=65537 keys.
Change-Id: I204ec615c8f2346670220a1aeb99269e4abd5f81
This optimized implementation of the SHA1 algorithm is about 28%
faster than the old one (on sapphire hardware) but assumes
little-endianness. Add it, but continue using the old implementation
on big-endian hardware.
