Visual Basic 6.0

Convert Java KeyStore to PEM

See more Java KeyStore (JKS) Examples

Loads a Java keystore file and saves the trusted certificate entries to a PEM file. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim jks As New ChilkatJavaKeyStore

Dim jksPassword As String
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 = 0) Then
    Debug.Print jks.LastErrorText
    Exit Sub
End If

' Open/create the output PEM file. 
' This example uses Chilkat's file access class for writing the output file.
' You may replace the file I/O lines of code with whatever is most convenient for you.
Dim fac As New CkFileAccess
success = fac.OpenForWrite("/pemFiles/caCerts.pem")
If (success = 0) Then
    Debug.Print fac.LastErrorText
    Exit Sub
End If

Dim numCerts As Long
numCerts = jks.NumTrustedCerts

Dim cert As New ChilkatCert
Dim pem As String

' Iterate over the trusted certs, get the PEM for each,
' and append it to the output file.
Dim i As Long
i = 0
Do While i < numCerts
    success = jks.TrustedCertAt(i,cert)

    ' Get the certificate in PEM format.  
    pem = cert.ExportCertPem()

    ' Append the PEM string to the open file.
    success = fac.AppendText(pem,"utf-8")
    If (success <> 1) Then
        Debug.Print fac.LastErrorText
        Exit Sub
    End If

    i = i + 1
Loop

' Close the output file.
fac.FileClose 

Debug.Print "Trusted certificates saved to PEM."