BIP38 (passphrase-encrypted private keys)

[scintill]

Includes AES code from the Crypto-JS project, and scrypt code from a NodeJS module (multi-threading by me).

[scintill]

I've realized maybe I shouldn't have done the Bitcoin.Util.dsha256 changes since they change an upstream bitcoin js lib, which will make it more difficult for you to merge in any updates they make. Let me know if it's a problem.

[scintill]

Support for creating encrypted keys is being finished up (https://bitcointalk.org/index.php?topic=136651), so maybe we should delay until that can be added at the same time.

[pointbiz]

scintill great work. I manually merged this with the latest BIP38 Decrypt commit. Thanks!
I modified the UI so that the passphrase box only appears if it's a BIP38 key.

I'll be adding more BIP38 stuff from Zeilaps branch for the Paper Wallets tab.

To run both synchronous and asynchronous tests use these query strings:
?unittests=true&asyncunittests=true

[scintill]

Looks great, thanks!

[ghost]

Why wasnt this merged?

[scintill]

@Drak: It was essentially merged in a2e09c7 with some other stuff.

[ghost]

Excellent. Thanks!!!