(DataFlex) Export a Private Key from an MS Storage Provider

Demonstrates how to export a private key from a Microsoft Storage Provider.

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoCert
    Boolean iSuccess
    Variant vPrivKey
    Handle hoPrivKey
    String sStorageProvider
    String sKeyName
    Handle hoKeyCon
    Variant vPrivKey2
    Handle hoPrivKey2
    Boolean iSilentFlag
    String sTemp1
    Boolean bTemp1

    // This example requires Chilkat v9.5.0.83 or greater.

    // We'll export a certificate's private key from the MS storage provider.
    // It is assumed the certificate + private key is already installed on the Windows system.
    // The export does not remove the key from the Windows storage provider.

    // First, let's get a certificate in one of the many ways we can do it.
    // (I ran certmgr.msc, opened a certificate, and noted it's thumbprint.)
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadByThumbprint Of hoCert "ea5a129c1919a52d238ee28d9f3a8f345b768388" "hex" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComSubjectDN Of hoCert To sTemp1
    Showln "Found: " sTemp1

    // First export the private key the easy way.
    Get ComExportPrivateKey Of hoCert To vPrivKey
    If (IsComObject(vPrivKey)) Begin
        Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
        Set pvComObject Of hoPrivKey To vPrivKey
    End
    Get ComLastMethodSuccess Of hoCert To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OK.. we have the private key.  Do whatever we want with it..

    Send Destroy of hoPrivKey

    // -------------------------------------------------------------
    // Now let's export in a more roundabout way by getting information about the 
    // storage provider and key name and then we'll export completely independent
    // of the certificate.
    // 
    // Remember: The private key is not contained within the certificate.  An X.509 certificate
    // embeds the public key, but the counterpart private key is stored elsewhere, such
    // as in a .pfx/.p12, or as in this case, in the Windows "protected store", or perhaps on
    // a smartcard or hardware token.  (But a private key stored on a smartcard or token cannot
    // be exported.  It must remain on the hardware.)
    // 

    Get ComCspName Of hoCert To sStorageProvider
    Get ComKeyContainerName Of hoCert To sKeyName

    Showln "Information about the certificate's private key:"
    Showln "Storage Provider: " sStorageProvider
    Showln "Key Name: " sKeyName

    // Export using just the name of the storage provider and key.
    Get Create (RefClass(cComChilkatKeyContainer)) To hoKeyCon
    If (Not(IsComObjectCreated(hoKeyCon))) Begin
        Send CreateComObject of hoKeyCon
    End
    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey2
    If (Not(IsComObjectCreated(hoPrivKey2))) Begin
        Send CreateComObject of hoPrivKey2
    End
    Move False To iSilentFlag
    Get pvComObject of hoPrivKey2 to vPrivKey2
    Get ComExportKey Of hoKeyCon sKeyName sStorageProvider iSilentFlag vPrivKey2 To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoKeyCon To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OK.. we have the private key in privKey2.  Do whatever we want with it..
    // Perhaps we save as encrypted PKCS8 PEM.
    Get ComSavePkcs8EncryptedPemFile Of hoPrivKey2 "myPassword" "qa_output/privKey2.pem" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPrivKey2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Success."


End_Procedure