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Java

Decrypt S/MIME using a Certificate with Private Key Access

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Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

DecryptUsingCert takes a single certificate that already has access to its associated private key, for example a certificate loaded from a PFX.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. A public-only certificate is insufficient for decryption. The certificate passed to DecryptUsingCert must be linked to its private key, as happens when it is loaded from a PFX/P12 file.

Chilkat Java Downloads

Chilkat2 Java
import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Mime;

public class ChilkatExample {

    public static void main(String[] args) {
        Mime mime = new Mime();
        try {
            mime.loadMimeFile("qa_data/encrypted.eml");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Decrypt using a certificate that already provides access to its private key (for example loaded
        // from a PFX).  The only argument is the certificate.
        String pfxPassword = "myPfxPassword";
        Cert cert = new Cert();
        String body;
        try {
            cert.loadPfxFile("qa_data/recipient.pfx", pfxPassword);

            mime.decryptUsingCert(cert);

            body = mime.getBodyDecoded();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(body);
    }
}