Nanocoin – A minimal cryptocurrency implemented in Haskell • Hacker News Board

Nanocoin – A minimal cryptocurrency implemented in Haskell

#1

Post by lambdaxdotx » Thu, Aug 31, 2017, 1:29 PM UTC

Nanocoin – A minimal cryptocurrency implemented in Haskell
github.com

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#2

Post by mrkgnao » Thu, Aug 31, 2017, 2:48 PM UTC

The extensive README is also a pretty good intro to how one can do crypto (as in cryptography: get off my lawn!) in Haskell using the excellent cryptonite library.

For those who won't click through to TFR:

    > import Crypto.Number.Hash (SHA3_256)
    > import Crypto.PubKey.ECC.ECDSA (sign, verify)
    > import Crypto.PubKey.ECC.Generate (generate)
    > import Crypto.PubKey.ECC.Types (getCurveByName, SEC_p256k1)
    
    > let msg = "hello world" :: ByteString
    > let secp256k1 = getCurveByName SEC_p256k1
    > (pubKey, privKey)  sig  verify SHA3_256 pubKey sig msg
    True

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#3

Post by seattle_spring » Thu, Aug 31, 2017, 3:05 PM UTC

Related question: What does one need to do before they can downvote posts?

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#4

Post by jrs95 » Thu, Aug 31, 2017, 3:07 PM UTC

seattle_spring wrote: post #3

Related question: What does one need to do before they can downvote posts?

Posts can't be downvoted, only comments.

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#5

Post by AckSyn » Thu, Aug 31, 2017, 3:08 PM UTC

seattle_spring wrote: post #3

Related question: What does one need to do before they can downvote posts?

I've wondered that myself. There's also no 'flag' link for comments that I can see as well.

And to the guy who says there's no downvoting, why do some comments get lighter and lighter until they're almost impossible to see? Especially if it's an unpopular opinion?

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#6

Post by suprfnk » Thu, Aug 31, 2017, 3:12 PM UTC

seattle_spring wrote: post #3

Related question: What does one need to do before they can downvote posts?

How is that related? Do you want to downvote this? May I ask why? As someone interested in Haskell, I found this a really helpful example.

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#7

Post by ythn » Thu, Aug 31, 2017, 3:15 PM UTC

seattle_spring wrote: post #3

Related question: What does one need to do before they can downvote posts?

Reach 500 karma and you can downvote comments. The only way to "downvote" posts is via flagging.

Don't like it? Hide it.

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#8

Post by wyc » Thu, Aug 31, 2017, 3:15 PM UTC

If you're interested, here's a secp256k1 implementation (underlying elliptical curve cryptography) in pure Haskell:

https://github.com/wyc/haschain/blob/master/Secp256K1.hs

Should probably wrap it into a Group or something. Of course it's not secure, just for fun.

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#9

Post by toppy » Thu, Aug 31, 2017, 3:26 PM UTC

Another well documented blockchain implementation in Haskell: http://www.michaelburge.us/2017/08/17/rolling-your-own-block...

Re: Nanocoin – A minimal cryptocurrency implemented in Haskell

#10

Post by somenewacc » Thu, Aug 31, 2017, 5:18 PM UTC

mrkgnao wrote: post #2

The extensive README is also a pretty good intro to how one can do crypto (as in cryptography: get off my lawn!) in Haskell using the excellent cryptonite library. For those who won't click through to TFR: > import Crypto.Number.Hash (SHA3_256) > import Crypto.PubKey.ECC.ECDSA (sign, verify) > import Crypto.PubKey.ECC.Generate (generate) > import Crypto.PubKey.ECC.Types (getCurveByName, SEC_p256k1) > let msg = "hello…

Is cryptonite anything like production ready? I mean, does it protect against timing side channels (perhaps using crypto instructions like AES-NI), etc.

Something I didn't like about it is that it exposes crypto primitives, including stuff like TripleDES, with no warning[0]. The tutorial also has you handle IVs directly.[1]

[0] https://hackage.haskell.org/package/cryptonite-0.24/docs/Cry...

[1] https://hackage.haskell.org/package/cryptonite-0.24/docs/Cry...