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Convert Java KeyStore to PKCS12 / PFX

See more Java KeyStore (JKS) Examples

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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Local $bSuccess = False

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

$oJks = ObjCreate("Chilkat.JavaKeyStore")

Local $sJksPassword = "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.
$bSuccess = $oJks.LoadFile($sJksPassword,"/someDir/keyStore.jks")
If ($bSuccess <> True) Then
    ConsoleWrite($oJks.LastErrorText & @CRLF)
    Exit
EndIf

;  To convert, we'll access the private key entries
;  from the JKS, add each to the PKCS12, and then save the PKCS12.
$oPkcs12 = ObjCreate("Chilkat.Pfx")

Local $iNumPrivateKeys = $oJks.NumPrivateKeys
Local $i

Local $oPrivKey
Local $oCertChain

;  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
While $i < $iNumPrivateKeys
    $oPrivKey = $oJks.GetPrivateKey($sJksPassword,$i)
    ConsoleWrite($oJks.GetPrivateKeyAlias($i) & @CRLF)
    $oCertChain = $oJks.GetCertChain($i)

    ;  Add the private key and it's associated certificate chain to the PKCS12.
    $bSuccess = $oPkcs12.AddPrivateKey($oPrivKey,$oCertChain)
    If ($bSuccess <> True) Then
        ConsoleWrite($oPkcs12.LastErrorText & @CRLF)

        Exit
    EndIf

    $i = $i + 1
Wend

;  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.)
Local $sPkcs12Password = "myNewPassword"
$bSuccess = $oPkcs12.ToFile($sPkcs12Password,"/pkcs12_files/myPfx.p12")
If ($bSuccess <> True) Then
    ConsoleWrite($oPkcs12.LastErrorText & @CRLF)
Else
    ConsoleWrite("Successfully saved to PKCS12 format." & @CRLF)
EndIf