Go

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. Go

    success := false

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

    ecc := chilkat.NewEcc()

    // 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.
    fortuna := chilkat.NewPrng()
    entropy := fortuna.GetEntropy(32,"base64")
    success = fortuna.AddEntropy(*entropy,"base64")

    privKey := chilkat.NewPrivateKey()
    success = ecc.GenKey("secp256k1",fortuna,privKey)
    if success == false {
        fmt.Println(ecc.LastErrorText())
        ecc.DisposeEcc()
        fortuna.DisposePrng()
        privKey.DisposePrivateKey()
        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 := chilkat.NewAsn()
    success = asn.LoadEncoded(*privKey.GetPkcs1ENC("base64"),"base64")
    if success != true {
        fmt.Println(asn.LastErrorText())
        ecc.DisposeEcc()
        fortuna.DisposePrng()
        privKey.DisposePrivateKey()
        asn.DisposeAsn()
        return
    }

    xml := chilkat.NewXml()
    xml.LoadXml(*asn.AsnToXml())

    fmt.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.
    crypt := chilkat.NewCrypt2()
    privKeyHex := crypt.ReEncode(*xml.GetChildContent("octets"),"base64","hex")

    fmt.Println("EC private key as hex = ", *privKeyHex)

    ecc.DisposeEcc()
    fortuna.DisposePrng()
    privKey.DisposePrivateKey()
    asn.DisposeAsn()
    xml.DisposeXml()
    crypt.DisposeCrypt2()