Hi Everyone,
I've got ed25519 on my testing fork at
https://github.com/noloader/cryptopp/tree/xed25519 .
It is in the early stages of integration. The most important part at this
point is the selection of Crypto++ interfaces. That is, our ed25519 signers
and verifiers have to expose the expected interfaces and implement the
expected methods. It is easier said than done because we are stitching
together Moon's ed25519, and it is _not_ interface friendly.
This is the part the has me most worried.... One of the things we did not
do is, start at a Point and then work up to GroupParameters,
Precomputation, PrivateKey and PublicKey. Point is the most important piece
because it is the implementation of group operations like + and * in the
field. If you are familiar with the library, all the existing code does so.
It also means this will fail in spectacular fashion:
ed25519::Signer signer(...);
Integer order =
signer.AccessKey().GetGroupParameters().GetSubgroupOrder();
We made AccessKey() work as expected because it is needed to load and store
parameters. But you can't drill in further and go below the keys.
At the moment we are using the NaCl library to implement key generation,
signing and verification. It produces correct results but it is slow. Next
we will forgo NaCl library functions and use Moon's code directly. NaCl
will stick around to cross-validate results. Cross-validation was always
one of the goals for adding NaCl.
If you have a moment take a look at things, especially the code in
validat{N}.cpp. That's where ed25519 is exercised like other signers and
verifiers, such as PKCS and RSA.
Jeff
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