MIME S/MIME Encryption Algorithm Properties

See more MIME Examples

Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

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.setBodyFromPlainText("This message will be encrypted.");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
        // des, 3des, and rc2.  The default is aes.
        mime.setPkcs7CryptAlg("aes");

        // Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
        mime.setPkcs7KeyLength(256);

        // OaepPadding selects the RSA key-transport padding.  The default is false (RSAES-PKCS1-v1_5).
        // Set true to use RSAES-OAEP, in which case the OAEP hash settings apply.
        mime.setOaepPadding(true);
        mime.setOaepHash("sha256");
        mime.setOaepMgfHash("sha256");

        // Load the recipient certificate (public key is sufficient for encrypting).
        Cert cert = new Cert();
        try {
            cert.loadFromFile("qa_data/recipient.cer");

            // Encrypt using the algorithm settings configured above.
            mime.encrypt(cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Encrypted with " + mime.getPkcs7CryptAlg() + " " + mime.getPkcs7KeyLength() + "-bit key.");
    }
}