(Perl) Convert Java KeyStore to PEM

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

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$jks = chilkat::CkJavaKeyStore->new();

$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 != 1) {
    print $jks->lastErrorText() . "\r\n";
    exit;
}

# 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.
$fac = chilkat::CkFileAccess->new();
$success = $fac->OpenForWrite("/pemFiles/caCerts.pem");
if ($success != 1) {
    print $fac->lastErrorText() . "\r\n";
    exit;
}

$numCerts = $jks->get_NumTrustedCerts();

# Iterate over the trusted certs, get the PEM for each,
# and append it to the output file.
$i = 0;
while ($i < $numCerts) {
    # cert is a Cert
    $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 != 1) {
        print $fac->lastErrorText() . "\r\n";

        exit;
    }

    $i = $i + 1;
}

# Close the output file.
$fac->FileClose();

print "Trusted certificates saved to PEM." . "\r\n";