69 lines
2.8 KiB
Markdown
69 lines
2.8 KiB
Markdown
btcec
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=====
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[](https://travis-ci.org/btcsuite/btcec)
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[](http://copyfree.org)
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[](http://godoc.org/github.com/btcsuite/btcd/btcec)
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Package btcec implements elliptic curve cryptography needed for working with
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Bitcoin (secp256k1 only for now). It is designed so that it may be used with the
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standard crypto/ecdsa packages provided with go. A comprehensive suite of test
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is provided to ensure proper functionality. Package btcec was originally based
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on work from ThePiachu which is licensed under the same terms as Go, but it has
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signficantly diverged since then. The btcsuite developers original is licensed
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under the liberal ISC license.
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Although this package was primarily written for btcd, it has intentionally been
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designed so it can be used as a standalone package for any projects needing to
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use secp256k1 elliptic curve cryptography.
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## Installation and Updating
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```bash
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$ go get -u github.com/btcsuite/btcd/btcec
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```
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## Examples
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* [Sign Message](http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--SignMessage)
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Demonstrates signing a message with a secp256k1 private key that is first
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parsed form raw bytes and serializing the generated signature.
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* [Verify Signature](http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--VerifySignature)
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Demonstrates verifying a secp256k1 signature against a public key that is
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first parsed from raw bytes. The signature is also parsed from raw bytes.
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* [Encryption](http://godoc.org/github.com/btcsuite/btcd/btcec#example-package--EncryptMessage)
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Demonstrates encrypting a message for a public key that is first parsed from
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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)
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Demonstrates decrypting a message using a private key that is first parsed
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from raw bytes.
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## GPG Verification Key
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All official release tags are signed by Conformal so users can ensure the code
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has not been tampered with and is coming from the btcsuite developers. To
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verify the signature perform the following:
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- Download the public key from the Conformal website at
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https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
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- Import the public key into your GPG keyring:
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```bash
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gpg --import GIT-GPG-KEY-conformal.txt
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```
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- Verify the release tag with the following command where `TAG_NAME` is a
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placeholder for the specific tag:
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```bash
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git tag -v TAG_NAME
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```
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## License
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Package btcec is licensed under the [copyfree](http://copyfree.org) ISC License
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except for btcec.go and btcec_test.go which is under the same license as Go.
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