Node.js 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. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    var ecc = new chilkat.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.
    var fortuna = new chilkat.Prng();
    var entropy = fortuna.GetEntropy(32,"base64");
    success = fortuna.AddEntropy(entropy,"base64");

    var privKey = new chilkat.PrivateKey();
    success = ecc.GenKey("secp256k1",fortuna,privKey);
    if (success == false) {
        console.log(ecc.LastErrorText);
        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.)

    var asn = new chilkat.Asn();
    success = asn.LoadEncoded(privKey.GetPkcs1ENC("base64"),"base64");
    if (success !== true) {
        console.log(asn.LastErrorText);
        return;
    }

    var xml = new chilkat.Xml();
    xml.LoadXml(asn.AsnToXml());

    console.log(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.
    var crypt = new chilkat.Crypt2();
    var privKeyHex = crypt.ReEncode(xml.GetChildContent("octets"),"base64","hex");

    console.log("EC private key as hex = " + privKeyHex);

}

chilkatExample();