Java

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Jwe;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        Jwe jwe = new Jwe();

        // Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
        // encryption algorithm (enc).
        JsonObject header = new JsonObject();
        header.updateString("alg", "A256KW");
        header.updateString("enc", "A256GCM");
        try {
            jwe.setProtectedHeader(header);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
        // from a secure source rather than hard-coding it.
        String base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
        try {
            jwe.setWrappingKey(0, base64Key, "base64");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
        BinData bdContent = new BinData();
        bdContent.appendString("Binary content to encrypt.", "utf-8");

        StringBuilder sbJwe = new StringBuilder();
        try {
            jwe.encryptBd(bdContent, sbJwe);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(sbJwe.getAsString());
    }
}