An alternative full node implementation of LBRY's blockchain written in Go (golang)
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Jimmy Song d69442834c Optimize ScalarBaseMult
Code uses a windowing/precomputing strategy to minimize ECC math.
Every 8-bit window of the 256 bits that compose a possible scalar multiple has a complete map that's pre-computed.
The precomputed data is in secp256k1.go and the generator for that file is in gensecp256k1.go

Also fixed a spelling error in a benchmark test.

Results so far seem to indicate the time taken is about 35% of what it was before.

Closes #2
2014-09-24 19:07:58 -05:00
.gitignore Initial commit. 2013-06-13 12:45:48 -05:00
.travis.yml Setup TravisCI to report cov stats to coveralls.io. 2014-08-10 14:02:54 -05:00
bench_test.go Optimize ScalarBaseMult 2014-09-24 19:07:58 -05:00
btcec.go Optimize ScalarBaseMult 2014-09-24 19:07:58 -05:00
btcec_test.go Optimize ScalarBaseMult 2014-09-24 19:07:58 -05:00
cov_report.sh Initial implementation. 2013-06-13 14:38:54 -05:00
doc.go Use testable examples and update doc.go README.md. 2014-08-10 15:14:36 -05:00
example_test.go Use testable examples and update doc.go README.md. 2014-08-10 15:14:36 -05:00
field.go Add 2014 to copyright dates. 2014-01-08 23:51:37 -06:00
field_test.go goimports -w . 2014-07-02 19:39:37 -05:00
gensecp256k1.go Optimize ScalarBaseMult 2014-09-24 19:07:58 -05:00
internal_test.go Optimize public key serialization. 2014-05-19 23:13:48 -05:00
LICENSE Add 2014 to copyright dates. 2014-01-08 23:51:37 -06:00
privkey.go Add Serialize method to PrivateKey. 2014-05-21 17:04:28 -05:00
privkey_test.go Add test for private key serialization. 2014-08-10 16:46:46 -05:00
pubkey.go Cleanup new code introduced by Pull Request #4. 2014-05-20 10:36:15 -05:00
pubkey_test.go Add test for private key serialization. 2014-08-10 16:46:46 -05:00
README.md Correct verify signature example doco link. 2014-08-10 15:16:14 -05:00
secp256k1.go Optimize ScalarBaseMult 2014-09-24 19:07:58 -05:00
signature.go Enforce low S values, by negating the value (modulo the order) if above order/2. 2014-07-31 22:04:14 +02:00
signature_test.go Enforce low S values, by negating the value (modulo the order) if above order/2. 2014-07-31 22:04:14 +02:00

btcec

[Build Status] (https://travis-ci.org/conformal/btcec) [![Coverage Status] (https://coveralls.io/repos/conformal/btcec/badge.png?branch=master)] (https://coveralls.io/r/conformal/btcec?branch=master)

Package btcec implements elliptic curve cryptography needed for working with Bitcoin (secp256k1 only for now). It is designed so that it may be used with the standard crypto/ecdsa packages provided with go. A comprehensive suite of test is provided to ensure proper functionality. Package btcec was originally based on work from ThePiachu which is licensed under the same terms as Go, but it has signficantly diverged since then. The Conformal original is licensed under the liberal ISC license.

This package is one of the core packages from btcd, an alternative full-node implementation of bitcoin which is under active development by Conformal. Although it was primarily written for btcd, this package has intentionally been designed so it can be used as a standalone package for any projects needing to use secp256k1 elliptic curve cryptography.

Documentation

[GoDoc] (http://godoc.org/github.com/conformal/btcec)

Full go doc style documentation for the project can be viewed online without installing this package by using the GoDoc site here.

You can also view the documentation locally once the package is installed with the godoc tool by running godoc -http=":6060" and pointing your browser to http://localhost:6060/pkg/github.com/conformal/btcec

Installation

$ go get github.com/conformal/btcec

Examples

GPG Verification Key

All official release tags are signed by Conformal so users can ensure the code has not been tampered with and is coming from Conformal. To verify the signature perform the following:

  • Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt

  • Import the public key into your GPG keyring:

    gpg --import GIT-GPG-KEY-conformal.txt
    
  • Verify the release tag with the following command where TAG_NAME is a placeholder for the specific tag:

    git tag -v TAG_NAME
    

License

Package btcec is licensed under the copyfree ISC License except for btcec.go and btcec_test.go which is under the same license as Go.