Java Requires Chilkat v11.0.0+

secp256k1 Key Generation and Keccak-256

See more ECC Examples

Starting in v11.0.0, Chilkat supports both secp256k1 key generation and Keccak-256 directly. These algorithms are typically used for Bitcoin and Ethereum. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Ecc;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Prng;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // Create a Fortuna PRNG and seed it with system entropy.
        // This will be our source of random data for generating the ECDSA private key.
        Prng fortuna = new Prng();
        String entropy = fortuna.getEntropy(32, "base64");
        fortuna.addEntropy(entropy, "base64");

        Ecc ecc = new Ecc();

        // Generate a random ECDSA private key on the secp256k1 curve.
        PrivateKey privKey = new PrivateKey();
        try {
            ecc.genKey("secp256k1", fortuna, privKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Successfully generated a sec256k1 key.");

        // Show how to compute the Keccak-256 hash in a few ways.
        StringBuilder sb = new StringBuilder();
        sb.append("hello");

        System.out.println("keccak-256: " + sb.getHash("keccak-256", "hex_lower", "utf-8"));

        // Output:
        // keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

        // To keccak-256 hash binary data
        BinData bd = new BinData();
        bd.appendEncoded("00010203040506", "hex");

        System.out.println("keccak-256: " + bd.getHash("keccak-256", "hex_lower"));

        // Output:
        // keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63
    }
}