(Visual Basic 6.0) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim jks As New ChilkatJavaKeyStore

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

' Load the Java keystore from a file.
Dim success As Long
success = jks.LoadFile(oldJksPassword,jksPath)
If (success <> 1) Then
    Debug.Print 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 Long
numPrivateKeys = jks.NumPrivateKeys

Dim i As Long
i = 0
Do While i < numPrivateKeys

    success = jks.ChangePassword(i,oldJksPassword,newJksPassword)
    If (success <> 1) Then
        Debug.Print jks.LastErrorText
        Exit Sub
    End If

    i = i + 1
Loop

' Write the JKS using the new password for the JKS file's keyed digest.
success = jks.ToFile(newJksPassword,jksPath)
If (success <> 1) Then
    Debug.Print jks.LastErrorText
    Exit Sub
End If

Debug.Print "Updated the password for the Java keystore file."