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give bip32 conversion its own section

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Anthony Towns 2020-02-01 16:53:02 +10:00 • committed by Pieter Wuille
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@ -142,6 +142,8 @@ The algorithm ''PubKey(sk)'' is defined as:
Note that we use a very different public key format (32 bytes) than the ones used by existing systems (which typically use elliptic curve points as public keys, or 33-byte or 65-byte encodings of them). A side effect is that ''PubKey(sk) = PubKey(bytes(n - int(sk))'', so every public key has two corresponding secret keys.
==== Public Key Conversion ====
As an alternative to generating keys randomly, it is also possible and safe to repurpose existing key generation algorithms for ECDSA in a compatible way. The secret keys constructed by such an algorithm can be used as ''sk'' directly. The public keys constructed by such an algorithm (assuming they use the 33-byte compressed encoding) need to be converted by dropping the first byte. Specifically, [[bip-0032.mediawiki|BIP32]] and schemes built on top of it remain usable.
==== Default Signing ====