crystal-ecdsa

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C bindings for OpenSSL ECDSA

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# 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.

Thanks to Eric Davis for his [ecies](https://github.com/insanum/ecies) library and to John Feras for his adaptation of Eric's code for this library.

[![Build Status](https://travis-ci.org/SushiChain/crystal-ecdsa.svg?branch=master)](https://travis-ci.org/SushiChain/crystal-ecdsa)

## Installation

1. Add the dependency to your `shard.yml`:
```yaml
dependencies:
  crystal-ecdsa:
    github: sushichain/crystal-ecdsa
```
2. Run `shards install`

## Usage

```crystal
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"])

# get the public key from a private key
public_key = ECCrypto.get_public_key_from_private(private_key)

# encrypt a message using a given receiver's public key
encrypted_message = ECCrypto.encrypt(receiver_public_key, "This is a secret message")

# decrypt a received message using known private key
decrypted_message = ECCrypto.decrypt(private_key, encrypted_message)

```

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

## Developement

You must generate the encryption.o before the library is usable and before the specs will run.

`cd encryption && make`

## 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](https://github.com/kingsleyh) - creator and maintainer
- [John Feras](https://github.com/jferas) - contributor

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