calcPubkeyRecoveryParam always assumed a non-compressed key, and was comparing
the address generated from a non-compressed public key against the original
address generated from the compressed public key.
This commit fixes it by passing the entire pubkey object, and configuring the
generated address to use the same compressed setting as the original one.
decodeFrom is no longer destructive with it's inputs.
Added isOnCurve().
Added validate().
Fixed formatting.
Factored out new functions serializeSig and parseSig.
The BigInteger class we're using supports negative integers and
encodes them with a sign bit. Since in our application we are dealing
with unsigned integers only, we need to disable this functionality by
creating two wrapper functions toByteArrayUnsigned and
fromByteArrayUnsigned.
Wei Lu
Andreas Brekken
Vitalik Buterin
Nadav Ivgi
Roman Shtylman
Stefan Thomas