(Lianja) Convert Java KeyStore to PKCS12 / PFX

Loads a Java keystore file and saves it as a PKCS12 / PFX. A Java keystore (JKS) can contain two types of entries: (1) trusted root certificates or (2) private keys + cert chains. Usually a JKS will contain all entries of one type or another (and thus a particular JKS serves one purpose or another; meaning that a JKS containing trusted roots is used as a source for verifying pre-trusted roots, and a JKS containing private keys (and cert chains) is used as a secure, encrypted store for private keys).

A PKCS12 / PFX typically contains one or more private keys, along with each private key's certificate chain. Therefore, it typically makes sense to only write the private key entries to a PKCS12 (and the associated certificate chains). If a JKS contains trusted root certificates, it makes more sense to conver it to a PEM file (such as the CA cert bundle in PEM format from mozilla.org).

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

loJks = createobject("CkJavaKeyStore")

lcJksPassword = "myJksPassword"

// Load the Java keystore from a file.  The JKS file password is used
// to verify the keyed digest that is found at the very end of the keystore.
// It verifies that the keystore has not been modified.
llSuccess = loJks.LoadFile(lcJksPassword,"/someDir/keyStore.jks")
if (llSuccess <> .T.) then
    ? loJks.LastErrorText
    release loJks
    return
endif

// To convert, we'll access the private key entries
// from the JKS, add each to the PKCS12, and then save the PKCS12.
loPkcs12 = createobject("CkPfx")

lnNumPrivateKeys = loJks.NumPrivateKeys

// For each private key entry, get the private key and
// the associated certificate chain.
// Each private key is password protected.  Usually it is the same
// password as used for the keyed digest of the entire JKS.  
// However, this does not have to be.  The password is passed
// here to handle the possibility of each private key requiring
// a different password.
i = 0
do while i < lnNumPrivateKeys
    loPrivKey = loJks.GetPrivateKey(lcJksPassword,i)
    ? loJks.GetPrivateKeyAlias(i)
    loCertChain = loJks.GetCertChain(i)

    // Add the private key and it's associated certificate chain to the PKCS12.
    llSuccess = loPkcs12.AddPrivateKey(loPrivKey,loCertChain)
    if (llSuccess <> .T.) then
        ? loPkcs12.LastErrorText
        release loCertChain
        release loPrivKey
        release loJks
        release loPkcs12
        return
    endif

    release loCertChain
    release loPrivKey
    i = i + 1
enddo

// Save the PKCS12 / PFX to a file.
// The password can be the same as the JKS password, or something new.
// (With the PKCS12 format, there is a single password for the entire contents
// of the file.  With the JKS format, there is flexibility in allowing each private key
// to have it's own password.)
lcPkcs12Password = "myNewPassword"
llSuccess = loPkcs12.ToFile(lcPkcs12Password,"/pkcs12_files/myPfx.p12")
if (llSuccess <> .T.) then
    ? loPkcs12.LastErrorText
else
    ? "Successfully saved to PKCS12 format."
endif



release loJks
release loPkcs12