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(DataFlex) Generate ECDSA Key and Get Details as XML

Demonstrates how to generate an ECC key and gets the parts as XML.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoEcc
    Variant vFortuna
    Handle hoFortuna
    String sEntropy
    Boolean iSuccess
    Variant vPrivKey
    Handle hoPrivKey
    Handle hoAsn
    Handle hoXml
    Handle hoCrypt
    String sPrivKeyHex
    String sTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatEcc)) To hoEcc
    If (Not(IsComObjectCreated(hoEcc))) Begin
        Send CreateComObject of hoEcc
    End

    //  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.
    Get Create (RefClass(cComChilkatPrng)) To hoFortuna
    If (Not(IsComObjectCreated(hoFortuna))) Begin
        Send CreateComObject of hoFortuna
    End
    Get ComGetEntropy Of hoFortuna 32 "base64" To sEntropy
    Get ComAddEntropy Of hoFortuna sEntropy "base64" To iSuccess

    Get pvComObject of hoFortuna to vFortuna
    Get ComGenEccKey Of hoEcc "secp256k1" vFortuna To vPrivKey
    If (IsComObject(vPrivKey)) Begin
        Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
        Set pvComObject Of hoPrivKey To vPrivKey
    End
    Get ComLastMethodSuccess Of hoEcc To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoEcc To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  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.)

    Get Create (RefClass(cComChilkatAsn)) To hoAsn
    If (Not(IsComObjectCreated(hoAsn))) Begin
        Send CreateComObject of hoAsn
    End
    Get ComGetPkcs1ENC Of hoPrivKey "base64" To sTemp1
    Get ComLoadEncoded Of hoAsn sTemp1 "base64" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoAsn To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Get ComAsnToXml Of hoAsn To sTemp1
    Get ComLoadXml Of hoXml sTemp1 To iSuccess

    Get ComGetXml Of hoXml To sTemp1
    Showln sTemp1

    //  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.
    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End
    Get ComGetChildContent Of hoXml "octets" To sTemp1
    Get ComReEncode Of hoCrypt sTemp1 "base64" "hex" To sPrivKeyHex

    Showln "EC private key as hex = " sPrivKeyHex

    Send Destroy of hoPrivKey


End_Procedure

 

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