(VB.NET UWP/WinRT) Change Password for Java KeyStore File

Demonstrates how to load a Java keystore, change the password, and save using the new password. If the Java keystore contains only trusted root certificates, then it's simply a matter of loading the JKS with the existing password, and then saving with a new password. If the JKS contains private key entries, then each private key entry must be re-keyed using the new password by calling the ChangePassword method.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Dim jks As New Chilkat.JavaKeyStore

Dim oldJksPassword As String = "existingPassword"
Dim newJksPassword As String = "newPassword"
Dim jksPath As String = "/someDir/keyStore.jks"

' Load the Java keystore from a file.
Dim success As Boolean = jks.LoadFile(oldJksPassword,jksPath)
If (success <> True) Then
    Debug.WriteLine(jks.LastErrorText)
    Exit Sub
End If


' If the JKS contains private key entries, then each
' must be re-keyed with the new password by calling ChangePassword.
Dim numPrivateKeys As Integer = jks.NumPrivateKeys

Dim i As Integer = 0
While i < numPrivateKeys

    success = jks.ChangePassword(i,oldJksPassword,newJksPassword)
    If (success <> True) Then
        Debug.WriteLine(jks.LastErrorText)
        Exit Sub
    End If


    i = i + 1
End While


' Write the JKS using the new password for the JKS file's keyed digest.
success = jks.ToFile(newJksPassword,jksPath)
If (success <> True) Then
    Debug.WriteLine(jks.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Updated the password for the Java keystore file.")