Crystal-ECDSA

A Crystal C binding for the ECDSA functionality of OpenSSL that focuses specifically on secp256k1. This library requires you to have OpenSSL installed.

Installation

1. Add the dependency to your shard.yml:

dependencies:
  crystal-ecdsa:
    github: sushichain/crystal-ecdsa

2. Run shards install

Usage

require "crystal-ecdsa"

# generate a keypair
key_pair = ECCrypto.create_key_pair
private_key = key_pair[:hex_private_key]
public_key = key_pair[:hex_public_key]

# hash a text message
message = ECCrypto.sha256("this message is being signed")

# sign the message with a private key
sig = ECCrypto.sign(private_key, message)

# verify the signature with the public key and the signature
ECCrypto.verify(public_key, message, sig["r"], sig["s"])

You can create a keypair which returns the public and private keys. The private key will always be of length 64 and the public key of length 130

Using the keypair you can sign a message and then verify it

Contributing

1. Fork it (https://github.com/sushichain/crystal-ecdsa/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• Kingsley Hendrickse - creator and maintainer