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(Swift) JWE using AES Key Wrap and AES_128_CBC_HMAC_SHA_256This example duplicates the example A.3 in RFC 7516 for JSON Web Encryption (JWE). Note: This example requires Chilkat v9.5.0.66 or greater.
func chilkatTest() { // 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. var success: Bool var plaintext: String? = "Live long and prosper." let jwe = CkoJwe()! // First build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256"} let jweProtHdr = CkoJsonObject()! jweProtHdr.append("alg", value: "A128KW") jweProtHdr.append("enc", value: "A128CBC-HS256") jwe.setProtectedHeader(jweProtHdr) print("JWE Protected Header: \(jweProtHdr.emit()!)") print("--") // The example A.3 in RFC 7516 uses the following 128-bit AES key, // specified in JWK (JSON Web Key) format: // {"kty":"oct", // "k":"GawgguFyGrWKav7AX4VKUg" // } // This is just a way of saying: The key type ("kty") is // a bunch of octets ("k") in base64url encoding. // We can simply set the AES wrapping key like this: var aesWrappingKey: String? = "GawgguFyGrWKav7AX4VKUg" jwe.setWrappingKey(0, encodedKey: aesWrappingKey, encoding: "base64url") // Encrypt and return the JWE: var strJwe: String? = jwe.encrypt(plaintext, charset: "utf-8") if jwe.lastMethodSuccess != true { print("\(jwe.lastErrorText!)") return } // Show the JWE we just created: print("\(strJwe!)") // Decrypt the JWE that was just produced. // 1) Load the JWE. // 2) Set the AES wrapping key. // 3) Decrypt. let jwe2 = CkoJwe()! success = jwe2.load(strJwe) if success != true { print("\(jwe2.lastErrorText!)") return } // Set the AES wrap key. jwe2.setWrappingKey(0, encodedKey: aesWrappingKey, encoding: "base64url") // Decrypt. var originalPlaintext: String? = jwe2.decrypt(0, charset: "utf-8") if jwe2.lastMethodSuccess != true { print("\(jwe2.lastErrorText!)") return } print("original text: ") print("\(originalPlaintext!)") // --------------------------------------------------------------------------------- // It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.3.7 // because it was produced using the same AES Wrap key. let sbJwe = CkoStringBuilder()! sbJwe.append("eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.") sbJwe.append("6KB707dM9YTIgHtLvtgWQ8mKwboJW3of9locizkDTHzBC2IlrT1oOQ.") sbJwe.append("AxY8DCtDaGlsbGljb3RoZQ.") sbJwe.append("KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY.") sbJwe.append("U0m_YmjN04DJvceFICbCVQ") success = jwe2.loadSb(sbJwe) if success != true { print("\(jwe2.lastErrorText!)") return } jwe2.setWrappingKey(0, encodedKey: aesWrappingKey, encoding: "base64url") // Decrypt. originalPlaintext = jwe2.decrypt(0, charset: "utf-8") if jwe2.lastMethodSuccess != true { print("\(jwe2.lastErrorText!)") return } print("\(originalPlaintext!)") } |
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