Java Requires Chilkat v11.0.0+

Generate a Random 256-bit AES Key and RSA Encrypt

See more RSA Examples

Generates a random 256-bit AES key and encrypts using an RSA public key. Only the owner of the RSA private key will be able to decrypt the AES key. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Prng;
import com.chilkatsoft.chilkat2.PublicKey;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // The RSA public key is used for encryption, and the private key for decryption.

        // The public key's role is to make encryption accessible to anyone while ensuring that
        // only the private key holder can decrypt the messages.
        // The public key is designed to be widely distributed so anyone can use it to encrypt messages
        // intended for the owner of the private key.

        // Load our 2048-bit RSA public key.
        PublicKey pubKey = new PublicKey();
        // In all Chilkat methods expecting a path, you pass either absolute or relative paths.
        try {
            pubKey.loadFromFile("rsaKeys/Test2048Rsa.pem");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Rsa rsa = new Rsa();

        // Tell RSA to use the public key.
        rsa.usePublicKey(pubKey);

        // Generate a random 256-bit AES key (32 bytes)
        BinData bdAesKey = new BinData();
        Prng prng = new Prng();
        prng.genRandomBd(32, bdAesKey);

        // RSA encrypt.
        rsa.encryptBd(bdAesKey, false);

        // Save the RSA encrypted AES key to a file.
        bdAesKey.writeFile("rsaEncrypted/myAes.key");
    }
}