[BOUNTY: 2.0 BTC] [CLAIMED] Message Signing in Armory - page 4.

etotheipi

legendary

Activity: 1428

Merit: 1093

Core Armory Developer

Quote from: jackjack on April 25, 2013, 01:37:08 PM

Great, I thought your deadline would have been shorter. I'm ok to look at it if you're ok.
I just want to be sure I understand: you want to sign a message with a private key? I thought Armory already signed messages

Armory's signmessage is not compatible with Bitcoin-Qt. Their signatures cannot be cross-verified (not even the same format). I didn't want to follow Bitcoin-Qt because I hate bare signatures. So I proposed I would become compatible if they started to support "proper" signatures: which is the original, properly encoded text, along with the signature. I didn't even get any commitment from them on this but someone suggested that RFC2440 was the way to go, and if I lead, I might get them to follow. Especially if it builds off an existing standard.

"Version 0" will be compatible with the existing Bitcoin-Qt, so that bare-signatures will cross-verify. I know some people still want the backwards compatibility.

"Version 1" implements the target behavior: copy this base64 block of text into and it pops up a windows saying "The following message has a verified signature from Address X: ". This is how message signing should be. Not multiple copy&paste ops which fail if you miss a whitespace character.

jackjack

legendary

Activity: 1176

Merit: 1260

May Bitcoin be touched by his Noodly Appendage

Great, I thought your deadline would have been shorter. I'm ok to look at it if you're ok.
I just want to be sure I understand: you want to sign a message with a private key? I thought Armory already signed messages

etotheipi

legendary

Activity: 1428

Merit: 1093

Core Armory Developer

Quote from: jackjack on April 25, 2013, 02:02:20 AM

I'm interested. In how much time this needs to be done?

I'd like to have it done in a couple weeks. But if there are snags and it can't be done before then, I guess there's not much I can do, eh? But if you look at the RFC, it doesn't look like it will be terribly difficult. Especially in python.

jackjack

legendary

Activity: 1176

Merit: 1260

May Bitcoin be touched by his Noodly Appendage

I'm interested. In how much time this needs to be done?

etotheipi

legendary

Activity: 1428

Merit: 1093

Core Armory Developer

Raised the bounty to 2 BTC!

etotheipi

legendary

Activity: 1428

Merit: 1093

Core Armory Developer

Claimed by jackjack!

Original message:

I was going to do this myself, but it should be fairly straightforward to implement and I have some other priorities right now. But there has been demand for it, so I'll let someone else take a shot it for me. The string manipulations should be trivial in python.

Goals:

(1) Create a new message signing algorithm that I can easily wrap with a nice GUI
(2) It should have three modes:
- (a) Bare signatures, compatible with signatures from Bitcoin-Qt/bitcoind
- (b) RFC2440-compatible, ASCII-armored signature blocks (Base64), with the CRC-24
- (c) RFC2440-compatible, ASCII-armored signature blocks (Clearsign)
(3) It would be neat if the clear-signed messages were somehow compatible with bare signatures: i.e. you could copy the text into Bitcoin-Qt and signature into Bitcoin-Qt and it would verify properly. But I highly doubt that's possible... maybe for simple messages
(4) Unit-tests that demonstrate dash-escaping, newline behavior, and unicode support
(5) Be willing to release the copyright of your solution to public domain

The reason I think (3) is not possible is that Sections 6 and 7 of RFC2440 indicate changing newlines (\n) to Windows newlines (\r\n). And dash-escaping the clear-signed text, but using the original text for signing. I haven't looked too deeply into it, but what I've seen is that it won't be too complicated, just requires some attention to detail. Such as getting CRC-24 coded correctly (also looks simple).

For Base64 encoding: go figure, python has it built-in: "import base64; base64.b64encode(msg), and base64.b64decode(sigBlock)"

This doesn't need to be integrated into the GUI at all. Just have it operate on raw strings, and I will integrate it into the GUI. The GUI would probably have radio buttons that say "Version 0 (Bare Signature/Bitcoin-Qt)", "Version 1 (Base64)", "Version 1 (Clearsign)", and the appropriate signature would be produced for the text that is in the text box (which may include newlines, dashes, and unicode).

Anyone up for the task? [/list][/list]

Topic: [BOUNTY: 2.0 BTC] [CLAIMED] Message Signing in Armory - page 4. (Read 7978 times)