PowerShell

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).

PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

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

$jks = New-Object Chilkat.JavaKeyStore

$jksPassword = "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.
$success = $jks.LoadFile($jksPassword,"/someDir/keyStore.jks")
if ($success -ne $true) {
    $($jks.LastErrorText)
    exit
}

# To convert, we'll access the private key entries
# from the JKS, add each to the PKCS12, and then save the PKCS12.
$pkcs12 = New-Object Chilkat.Pfx

$numPrivateKeys = $jks.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.
$i = 0
while ($i -lt $numPrivateKeys) {
    $privKey = $jks.GetPrivateKey($jksPassword,$i)
    $($jks.GetPrivateKeyAlias($i))
    $certChain = $jks.GetCertChain($i)

    # Add the private key and it's associated certificate chain to the PKCS12.
    $success = $pkcs12.AddPrivateKey($privKey,$certChain)
    if ($success -ne $true) {
        $($pkcs12.LastErrorText)

        exit
    }

    $i = $i + 1
}

# 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.)
$pkcs12Password = "myNewPassword"
$success = $pkcs12.ToFile($pkcs12Password,"/pkcs12_files/myPfx.p12")
if ($success -ne $true) {
    $($pkcs12.LastErrorText)
}
else {
    $("Successfully saved to PKCS12 format.")
}