History

Olaoluwa Osuntokun b686b0a8eb Merge pull request #1429 from cfromknecht/btcec-double-is-on-curve btcec: optimize square root using fieldVal		2019-10-09 17:54:42 -07:00
..
bench_test.go	btcec: benchmark ParsePubKey for compressed keys	2019-10-02 15:31:23 -07:00
btcec.go	btcec/btcec: deprecate QPlus1Div4() in favor of Q()	2019-10-02 18:22:17 -07:00
btcec_test.go	btcec: remove obsolete test	2018-05-15 20:47:29 -07:00
ciphering.go	Bump up copyright. Reflect recent update. (#699 )	2016-05-22 23:22:42 -05:00
ciphering_test.go	btcec: Consolidate tests into the btcec package.	2016-10-19 00:55:23 -05:00
doc.go	Relicense to the btcsuite developers.	2015-05-01 12:00:56 -05:00
example_test.go	chainhash: Abstract hash logic to new package. (#729 )	2016-08-08 14:04:33 -05:00
field.go	btcec/pubkey: optimize decompressPoint using fieldVals	2019-10-02 18:21:59 -07:00
field_test.go	btcec/pubkey: optimize decompressPoint using fieldVals	2019-10-02 18:21:59 -07:00
genprecomps.go	Relicense to the btcsuite developers.	2015-05-01 12:00:56 -05:00
gensecp256k1.go	Relicense to the btcsuite developers.	2015-05-01 12:00:56 -05:00
precompute.go	Relicense to the btcsuite developers.	2015-05-01 12:00:56 -05:00
privkey.go	Change copyright date for code that was updated this year(2016).	2016-01-07 09:01:51 -07:00
privkey_test.go	btcec: Consolidate tests into the btcec package.	2016-10-19 00:55:23 -05:00
pubkey.go	btcec/pubkey: optimize decompressPoint using fieldVals	2019-10-02 18:21:59 -07:00
pubkey_test.go	btcec: add new IsCompressedPubKey function	2017-08-13 23:17:40 -05:00
README.md	multi: Update markdown files for GFM changes.	2017-05-25 12:06:16 -05:00
secp256k1.go	btcec: Regenerate and update precomputed data.	2017-08-18 12:53:28 -05:00
signature.go	btcec: correct the comment of recoverKeyFromSignature	2019-09-25 17:28:57 -07:00
signature_test.go	btcec/signature: fix DoS bug with signature parsing	2018-09-20 09:26:45 -07:00

README.md

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

Sign Message
Demonstrates signing a message with a secp256k1 private key that is first parsed form raw bytes and serializing the generated signature.
Verify Signature
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 Demonstrates encrypting a message for a public key that is first parsed from raw bytes, then decrypting it using the corresponding private key.
Decryption 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:

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.