a52eb04aaa
As noted in issue #706, the existing code had an issue where the normalized result was > P when both the first and second words of the field representation being normalized were BOTH greater than or equal to the first and second words of P. Although this condition is rare in practice, it needs to be handled properly. This resolves the issue by comparing the low words in the final reduction step against the normalized low order prime bits to ensure the final subtraction occurs correctly any time they're > P. This approach retains the constant time property as well. |
||
|---|---|---|
| .. | ||
| bench_test.go | ||
| btcec.go | ||
| btcec_test.go | ||
| ciphering.go | ||
| ciphering_test.go | ||
| doc.go | ||
| example_test.go | ||
| field.go | ||
| field_test.go | ||
| genprecomps.go | ||
| gensecp256k1.go | ||
| internal_test.go | ||
| precompute.go | ||
| privkey.go | ||
| privkey_test.go | ||
| pubkey.go | ||
| pubkey_test.go | ||
| README.md | ||
| secp256k1.go | ||
| signature.go | ||
| signature_test.go | ||
btcec
[
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(https://travis-ci.org/btcsuite/btcec) ![ISC License]
(http://img.shields.io/badge/license-ISC-blue.svg)
[
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(http://godoc.org/github.com/btcsuite/btcd/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. 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 btcsuite developers original is licensed under the liberal ISC license.
Although this package was primarily written for btcd, it has intentionally been designed so it can be used as a standalone package for any projects needing to use secp256k1 elliptic curve cryptography.
Installation and Updating
$ go get -u github.com/btcsuite/btcd/btcec
Examples
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[Sign Message] (http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--SignMessage)
Demonstrates signing a message with a secp256k1 private key that is first parsed form raw bytes and serializing the generated signature. -
[Verify Signature] (http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--VerifySignature)
Demonstrates verifying a secp256k1 signature against a public key that is first parsed from raw bytes. The signature is also parsed from raw bytes. -
[Encryption] (http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--EncryptMessage) Demonstrates encrypting a message for a public key that is first parsed from raw bytes, then decrypting it using the corresponding private key.
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[Decryption] (http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--DecryptMessage) Demonstrates decrypting a message using a private key that is first parsed from raw bytes.
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 the btcsuite developers. To verify the signature perform the following:
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Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
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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 copyfree ISC License except for btcec.go and btcec_test.go which is under the same license as Go.