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 library and to John Feras for his adaptation of Eric's code for this library.
dependencies: crystal-ecdsa: github: sushichain/crystal-ecdsa
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
You must generate the encryption.o before the library is usable and before the specs will run.
cd encryption && make
git checkout -b my-new-feature)
git commit -am 'Add some feature')
git push origin my-new-feature)