C#

Generate ECDSA Key and Get Details as XML

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Demonstrates how to generate an ECDSA key and gets the parts as XML. C#

bool success = false;

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

Chilkat.Ecc 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.
Chilkat.Prng fortuna = new Chilkat.Prng();
string entropy = fortuna.GetEntropy(32,"base64");
success = fortuna.AddEntropy(entropy,"base64");

Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = ecc.GenKey("secp256k1",fortuna,privKey);
if (success == false) {
    Debug.WriteLine(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.)

Chilkat.Asn asn = new Chilkat.Asn();
success = asn.LoadEncoded(privKey.GetPkcs1ENC("base64"),"base64");
if (success != true) {
    Debug.WriteLine(asn.LastErrorText);
    return;
}

Chilkat.Xml xml = new Chilkat.Xml();
xml.LoadXml(asn.AsnToXml());

Debug.WriteLine(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.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
string privKeyHex = crypt.ReEncode(xml.GetChildContent("octets"),"base64","hex");

Debug.WriteLine("EC private key as hex = " + privKeyHex);