(.NET Core C#) Convert Java KeyStore to PEM

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

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

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

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.
bool success = jks.LoadFile(jksPassword,"/someDir/keyStore.jks");
if (success != true) {
    Debug.WriteLine(jks.LastErrorText);
    return;
}

// 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.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
success = fac.OpenForWrite("/pemFiles/caCerts.pem");
if (success != true) {
    Debug.WriteLine(fac.LastErrorText);
    return;
}

int numCerts = jks.NumTrustedCerts;
int i;

Chilkat.Cert cert = null;
string pem;

// Iterate over the trusted certs, get the PEM for each,
// and append it to the output file.
i = 0;
while (i < numCerts) {
    cert = jks.GetTrustedCert(i);

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

    // Append the PEM string to the open file.
    // The PEM contains only us-ascii chars..
    success = fac.AppendAnsi(pem);
    if (success != true) {
        Debug.WriteLine(fac.LastErrorText);

        return;
    }

    i = i + 1;
}

// Close the output file.
fac.FileClose();

Debug.WriteLine("Trusted certificates saved to PEM.");