Java Requires Chilkat v11.0.0+

Generate ECDSA Key and Get Details as XML

See more ECC Examples

Demonstrates how to generate an ECDSA key and gets the parts as XML. Chilkat2 Java

import com.chilkatsoft.chilkat2.Asn;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.Ecc;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Prng;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

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

        Ecc ecc = new Ecc();

        // Generate a random ECC private key on the secp256k1 curve.
        // Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256r1.

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

        PrivateKey privKey = new PrivateKey();
        try {
            ecc.genKey("secp256k1", fortuna, privKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // An EC private key has this ASN.1
        // ECPrivateKey ::= SEQUENCE {
        //     version        INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
        //     privateKey     OCTET STRING,
        //     parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
        //     publicKey  [1] BIT STRING OPTIONAL (This is the ANSI X9.63 public key format.)

        Asn asn = new Asn();
        try {
            asn.loadEncoded(privKey.getPkcs1ENC("base64"), "base64");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Xml xml = new Xml();
        xml.loadXml(asn.asnToXml());

        System.out.println(xml.getXml());

        // The XML looks like this:
        // <?xml version="1.0" encoding="utf-8" ?>
        // <sequence>
        //     <int>01</int>
        //     <octets>JgJvBG+3wletkJab8iXAkpz0O8/AgWZSpkYVcB7SpnU=</octets>
        //     <contextSpecific tag="0" constructed="1">
        //         <oid>1.3.132.0.10</oid>
        //     </contextSpecific>
        // </sequence>

        // The 32-byte private key is in the octets..
        // Get it as hex.
        Crypt2 crypt = new Crypt2();
        String privKeyHex = crypt.reEncode(xml.getChildContent("octets"), "base64", "hex");

        System.out.println("EC private key as hex = " + privKeyHex);
    }
}