Rust 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). Rust

// 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.

let plaintext = "Live long and prosper.".to_string();

// First build the JWE Protected Header.
// We want to build this: {"alg":"RSA1_5","enc":"A128CBC-HS256"}
let jwe_prot_hdr = chilkat::JsonObject::new();
let _ = jwe_prot_hdr.append_string("alg", "RSA1_5");
let _ = jwe_prot_hdr.append_string("enc", "A128CBC-HS256");
println!("JWE Protected Header: {}", jwe_prot_hdr.emit().unwrap_or_default());
println!("--");

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

// Load this JWK into a Chilkat private key object.
let rsa_priv_key = chilkat::PrivateKey::new();
if rsa_priv_key.load_jwk(&sb_jwk.get_as_string().unwrap_or_default()).is_err() {
    println!("{}", rsa_priv_key.last_error_text());
    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
let rsa_pub_key = chilkat::PublicKey::new();
let _ = rsa_priv_key.to_public_key(&rsa_pub_key);

// Create the JWE...
let jwe = chilkat::Jwe::new();
let _ = jwe.set_protected_header(&jwe_prot_hdr);
let _ = jwe.set_public_key(0, &rsa_pub_key);

let Ok(str_jwe) = jwe.encrypt(&plaintext, "utf-8") else {
    println!("{}", jwe.last_error_text());
    return;
};

// Show the JWE we just created:
println!("{}", str_jwe);

// 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.
let jwe2 = chilkat::Jwe::new();
if jwe2.load_jwe(&str_jwe).is_err() {
    println!("{}", jwe2.last_error_text());
    return;
}

// Provide the RSA private key for decryption.
// (The JWE was encrypted for a single recipient at index 0.)
let _ = jwe2.set_private_key(0, &rsa_priv_key);

// Decrypt.
let Ok(mut original_plaintext) = jwe2.decrypt(0, "utf-8") else {
    println!("{}", jwe2.last_error_text());
    return;
};

println!("original text: ");
println!("{}", original_plaintext);

// ---------------------------------------------------------------------------------
// 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.

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

if jwe2.load_jwe_sb(&sb_jwe).is_err() {
    println!("{}", jwe2.last_error_text());
    return;
}

// Provide the RSA private key for decryption.
let _ = jwe2.set_private_key(0, &rsa_priv_key);

// Decrypt.
original_plaintext = jwe2.decrypt(0, "utf-8").unwrap_or_default();
if !jwe2.last_method_success() {
    println!("{}", jwe2.last_error_text());
    return;
}

println!("{}", original_plaintext);