(C# 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.

Chilkat.JavaKeyStore jks = new Chilkat.JavaKeyStore();

string oldJksPassword = "existingPassword";
string newJksPassword = "newPassword";
string jksPath = "/someDir/keyStore.jks";

// Load the Java keystore from a file.
bool success = jks.LoadFile(oldJksPassword,jksPath);
if (success != true) {
    Debug.WriteLine(jks.LastErrorText);
    return;
}

// If the JKS contains private key entries, then each
// must be re-keyed with the new password by calling ChangePassword.
int numPrivateKeys = jks.NumPrivateKeys;

int i = 0;
while (i < numPrivateKeys) {

    success = jks.ChangePassword(i,oldJksPassword,newJksPassword);
    if (success != true) {
        Debug.WriteLine(jks.LastErrorText);
        return;
    }

    i = i + 1;
}

// Write the JKS using the new password for the JKS file's keyed digest.
success = jks.ToFile(newJksPassword,jksPath);
if (success != true) {
    Debug.WriteLine(jks.LastErrorText);
    return;
}

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