Java Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Strings

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt strings using public and private keys. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.PublicKey;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Rsa rsa = new Rsa();

        // This example also generates the public and private
        // keys to be used in the RSA encryption.
        // Normally, you would generate a key pair once,
        // and distribute the public key to your partner.
        // Anything encrypted with the public key can be
        // decrypted with the private key.  The reverse is
        // also true: anything encrypted using the private
        // key can be decrypted using the public key.

        // Generate a 2048-bit key.  Chilkat RSA supports
        // key sizes ranging from 512 bits to 4096 bits.
        PrivateKey privKey = new PrivateKey();
        try {
            rsa.genKey(2048, privKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        PublicKey pubKey = new PublicKey();
        privKey.toPublicKey(pubKey);

        String plainText = "Encrypting and decrypting should be easy!";

        // Start with a new RSA object to demonstrate that all we
        // need are the keys previously exported:
        Rsa rsaEncryptor = new Rsa();

        // Encrypted output is always binary.  In this case, we want
        // to encode the encrypted bytes in a printable string.
        // Our choices are "hex", "base64", "url", "quoted-printable".
        rsaEncryptor.setEncodingMode("hex");

        // We'll encrypt with the public key and decrypt with the private
        // key.
        rsaEncryptor.usePublicKey(pubKey);

        boolean usePrivateKey = false;
        String encryptedStr = rsaEncryptor.encryptStringENC(plainText, usePrivateKey);
        System.out.println(encryptedStr);

        // Now decrypt:
        Rsa rsaDecryptor = new Rsa();

        rsaDecryptor.setEncodingMode("hex");
        rsaDecryptor.usePrivateKey(privKey);

        usePrivateKey = true;
        String decryptedStr = rsaDecryptor.decryptStringENC(encryptedStr, usePrivateKey);

        System.out.println(decryptedStr);
    }
}