1dbf389ceb
This change removes the internal pad function in favor a more opimized paddedAppend function. Unlike pad, which would always alloate a new slice of the desired size and copy the bytes into it, paddedAppend only appends the leading padding when necesary, and uses the builtin append to copy the remaining source bytes. pad was also used in combination with another call to the builtin copy func to copy into a zeroed byte slice. As the slice is now created using make with an initial length of zero, this copy can also be removed. As confirmed by poking the bytes with the unsafe package, gc does not zero array elements between the len and cap when allocating slices with make(). In combination with the paddedAppend func, this results in only a single copy of each byte, with no unnecssary zeroing, when creating the serialized pubkeys. This has not been tested with other Go compilers (namely, gccgo and llgo), but the new behavior is still functionally correct regardless of compiler optimizations. The TestPad function has been removed as the pad func it tested has likewise been removed. ok @davecgh |
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|---|---|---|
| .gitignore | ||
| .travis.yml | ||
| bench_test.go | ||
| btcec.go | ||
| btcec_test.go | ||
| cov_report.sh | ||
| doc.go | ||
| field.go | ||
| field_test.go | ||
| internal_test.go | ||
| LICENSE | ||
| privkey.go | ||
| pubkey.go | ||
| pubkey_test.go | ||
| README.md | ||
| signature.go | ||
| signature_test.go | ||
| test_coverage.txt | ||
btcec
[
]
(https://travis-ci.org/conformal/btcec)
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. There is a test suite which
provides extensive coverage. See test_coverage.txt for the current coverage
(using gocov). On a UNIX-like OS, the script cov_report.sh can be used to
generate the report. Package btcec uses work from ThePiachu which is licensed
under the same terms as Go. 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.
Sample Use
import crypto/ecdsa
pubKey, err := btcec.ParsePubKey(pkStr, btcec.S256())
signature, err := btcec.ParseSignature(sigStr, btcec.S256())
ok := ecdsa.Verify(pubKey, message, signature.R, signature.S)
Documentation
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
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_NAMEis a placeholder for the specific tag:git tag -v TAG_NAME
License
Package btcec is licensed under the liberal ISC License except for btcec.go and btcec_test.go which is under the same license as Go.