Java Requires Chilkat v11.0.0+

JWE using RSAES-PKCS1-v1_5 and AES_128_CBC_HMAC_SHA_256

See more JSON Web Encryption (JWE) Examples

This example duplicates the example A.2 in RFC 7516 for JSON Web Encryption (JWE). Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Jwe;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.PublicKey;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

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

        // Note: This example requires Chilkat v9.5.0.66 or greater.

        String plaintext = "Live long and prosper.";

        // First build the JWE Protected Header.
        // We want to build this: {"alg":"RSA1_5","enc":"A128CBC-HS256"}
        JsonObject jweProtHdr = new JsonObject();
        jweProtHdr.appendString("alg", "RSA1_5");
        jweProtHdr.appendString("enc", "A128CBC-HS256");
        System.out.println("JWE Protected Header: " + jweProtHdr.emit());
        System.out.println("--");

        // The specific RSA key used in the A.2 example is the following JWK:
        StringBuilder sbJwk = new StringBuilder();
        sbJwk.append("{\"kty\":\"RSA\",");
        sbJwk.append("\"n\":\"sXchDaQebHnPiGvyDOAT4saGEUetSyo9MKLOoWFsueri23bOdgWp4Dy1Wl");
        sbJwk.append("UzewbgBHod5pcM9H95GQRV3JDXboIRROSBigeC5yjU1hGzHHyXss8UDpre");
        sbJwk.append("cbAYxknTcQkhslANGRUZmdTOQ5qTRsLAt6BTYuyvVRdhS8exSZEy_c4gs_");
        sbJwk.append("7svlJJQ4H9_NxsiIoLwAEk7-Q3UXERGYw_75IDrGA84-lA_-Ct4eTlXHBI");
        sbJwk.append("Y2EaV7t7LjJaynVJCpkv4LKjTTAumiGUIuQhrNhZLuF_RJLqHpM2kgWFLU");
        sbJwk.append("7-VTdL1VbC2tejvcI2BlMkEpk1BzBZI0KQB0GaDWFLN-aEAw3vRw\",");
        sbJwk.append("\"e\":\"AQAB\",");
        sbJwk.append("\"d\":\"VFCWOqXr8nvZNyaaJLXdnNPXZKRaWCjkU5Q2egQQpTBMwhprMzWzpR8Sxq");
        sbJwk.append("1OPThh_J6MUD8Z35wky9b8eEO0pwNS8xlh1lOFRRBoNqDIKVOku0aZb-ry");
        sbJwk.append("nq8cxjDTLZQ6Fz7jSjR1Klop-YKaUHc9GsEofQqYruPhzSA-QgajZGPbE_");
        sbJwk.append("0ZaVDJHfyd7UUBUKunFMScbflYAAOYJqVIVwaYR5zWEEceUjNnTNo_CVSj");
        sbJwk.append("-VvXLO5VZfCUAVLgW4dpf1SrtZjSt34YLsRarSb127reG_DUwg9Ch-Kyvj");
        sbJwk.append("T1SkHgUWRVGcyly7uvVGRSDwsXypdrNinPA4jlhoNdizK2zF2CWQ\",");
        sbJwk.append("\"p\":\"9gY2w6I6S6L0juEKsbeDAwpd9WMfgqFoeA9vEyEUuk4kLwBKcoe1x4HG68");
        sbJwk.append("ik918hdDSE9vDQSccA3xXHOAFOPJ8R9EeIAbTi1VwBYnbTp87X-xcPWlEP");
        sbJwk.append("krdoUKW60tgs1aNd_Nnc9LEVVPMS390zbFxt8TN_biaBgelNgbC95sM\",");
        sbJwk.append("\"q\":\"uKlCKvKv_ZJMVcdIs5vVSU_6cPtYI1ljWytExV_skstvRSNi9r66jdd9-y");
        sbJwk.append("BhVfuG4shsp2j7rGnIio901RBeHo6TPKWVVykPu1iYhQXw1jIABfw-MVsN");
        sbJwk.append("-3bQ76WLdt2SDxsHs7q7zPyUyHXmps7ycZ5c72wGkUwNOjYelmkiNS0\",");
        sbJwk.append("\"dp\":\"w0kZbV63cVRvVX6yk3C8cMxo2qCM4Y8nsq1lmMSYhG4EcL6FWbX5h9yuv");
        sbJwk.append("ngs4iLEFk6eALoUS4vIWEwcL4txw9LsWH_zKI-hwoReoP77cOdSL4AVcra");
        sbJwk.append("Hawlkpyd2TWjE5evgbhWtOxnZee3cXJBkAi64Ik6jZxbvk-RR3pEhnCs\",");
        sbJwk.append("\"dq\":\"o_8V14SezckO6CNLKs_btPdFiO9_kC1DsuUTd2LAfIIVeMZ7jn1Gus_Ff");
        sbJwk.append("7B7IVx3p5KuBGOVF8L-qifLb6nQnLysgHDh132NDioZkhH7mI7hPG-PYE_");
        sbJwk.append("odApKdnqECHWw0J-F0JWnUd6D2B_1TvF9mXA2Qx-iGYn8OVV1Bsmp6qU\",");
        sbJwk.append("\"qi\":\"eNho5yRBEBxhGBtQRww9QirZsB66TrfFReG_CcteI1aCneT0ELGhYlRlC");
        sbJwk.append("tUkTRclIfuEPmNsNDPbLoLqqCVznFbvdB7x-Tl-m0l_eFTj2KiqwGqE9PZ");
        sbJwk.append("B9nNTwMVvH3VRRSLWACvPnSiwP8N5Usy-WRXS-V7TbpxIhvepTfE0NNo\"");
        sbJwk.append("}");

        // Load this JWK into a Chilkat private key object.
        PrivateKey rsaPrivKey = new PrivateKey();
        try {
            rsaPrivKey.loadJwk(sbJwk.getAsString());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The public key is used to encrypt (i.e. create the JWE),
        // and the private key is used to decrypt.
        // The RSA public key is simply a subset of the private key.  The RSA public key
        // is composed of the "n" and "e" members shown above.  These are also known as the
        // modulus and exponent.
        // We can simply get the public key object from the private key object
        PublicKey rsaPubKey = new PublicKey();
        rsaPrivKey.toPublicKey(rsaPubKey);

        // Create the JWE...
        Jwe jwe = new Jwe();
        jwe.setProtectedHeader(jweProtHdr);
        jwe.setPublicKey(0, rsaPubKey);

        String strJwe;
        try {
            strJwe = jwe.encrypt(plaintext, "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Show the JWE we just created:
        System.out.println(strJwe);

        // Note: The RSA PKCS1_V1_5 padding uses random value, and the results
        // will be different each time.  However, each result should be successfully
        // decrypting if using the correct RSA private key.

        // Let's decrypt the JWE that was just produced.
        // Do the following to decrypt a JWE:
        // 1) Load the JWE.
        // 2) Set the private key for decryption.
        // 3) Decrypt.
        Jwe jwe2 = new Jwe();
        String originalPlaintext;
        try {
            jwe2.loadJwe(strJwe);

            // Provide the RSA private key for decryption.
            // (The JWE was encrypted for a single recipient at index 0.)
            jwe2.setPrivateKey(0, rsaPrivKey);

            // Decrypt.
            originalPlaintext = jwe2.decrypt(0, "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("original text: ");
        System.out.println(originalPlaintext);

        // ---------------------------------------------------------------------------------
        // It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.2.7
        // because it was produced using the same RSA key.

        StringBuilder sbJwe = new StringBuilder();
        sbJwe.append("eyJhbGciOiJSU0ExXzUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.");
        sbJwe.append("UGhIOguC7IuEvf_NPVaXsGMoLOmwvc1GyqlIKOK1nN94nHPoltGRhWhw7Zx0-kFm");
        sbJwe.append("1NJn8LE9XShH59_i8J0PH5ZZyNfGy2xGdULU7sHNF6Gp2vPLgNZ__deLKxGHZ7Pc");
        sbJwe.append("HALUzoOegEI-8E66jX2E4zyJKx-YxzZIItRzC5hlRirb6Y5Cl_p-ko3YvkkysZIF");
        sbJwe.append("NPccxRU7qve1WYPxqbb2Yw8kZqa2rMWI5ng8OtvzlV7elprCbuPhcCdZ6XDP0_F8");
        sbJwe.append("rkXds2vE4X-ncOIM8hAYHHi29NX0mcKiRaD0-D-ljQTP-cFPgwCp6X-nZZd9OHBv");
        sbJwe.append("-B3oWh2TbqmScqXMR4gp_A.");
        sbJwe.append("AxY8DCtDaGlsbGljb3RoZQ.");
        sbJwe.append("KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY.");
        sbJwe.append("9hH0vgRfYgPnAHOd8stkvw");

        try {
            jwe2.loadJweSb(sbJwe);

            // Provide the RSA private key for decryption.
            jwe2.setPrivateKey(0, rsaPrivKey);

            // Decrypt.
            originalPlaintext = jwe2.decrypt(0, "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(originalPlaintext);
    }
}