secp256k1

Package secp256k1 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 secp256k1 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.

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.

Installation

$ go get -u github.com/pedroalbanese/secp256k1

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

Command

Usage of secp256k1:
  -dec
        Decrypt with Privatekey.
  -derive
        Derive shared secret key.
  -enc
        Encrypt with Publickey.
  -key string
        Private/Public key depending on operation.
  -keygen
        Generate keypair.
  -pub string
        Remote's side Public key. (for DERIVE)
  -sign
        Sign with Private key.
  -signature string
        Signature. (for VERIFY)
  -verify
        Verify with Public key.

License

Package secp256k1 is licensed under the copyfree ISC License except for secp256k1.go and secp256k1_test.go which is under the same license as Go.

Advanced

Renew secp256k1.go

go run -tags=gensecp256k1 genprecomps.go