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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