(Swift 2) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES key.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // First generate a 256-bit AES key (32 bytes).
    let prng = CkoPrng()
    let bdAesKey = CkoBinData()
    var success: Bool = prng.GenRandomBd(32, bd: bdAesKey)

    // Use a public key from a certificate for RSA encryption.
    let cert = CkoCert()

    success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem")
    if success == false {
        print("\(cert.LastErrorText)")
        return
    }

    var pubKey: CkoPublicKey? = cert.ExportPublicKey()
    if cert.LastMethodSuccess != true {
        print("\(cert.LastErrorText)")
        return
    }

    let rsa = CkoRsa()
    success = rsa.ImportPublicKeyObj(pubKey)
    if success == false {
        print("\(rsa.LastErrorText)")
        return
    }

    pubKey = nil

    // RSA encrypt our 32-byte AES key.
    // The contents of bdAesKey are replaced with result of the RSA encryption.
    success = rsa.EncryptBd(bdAesKey, usePrivateKey: false)
    if success == false {
        print("\(rsa.LastErrorText)")
        return
    }

    // Return the result as a base64 string
    var encryptedAesKey: String? = bdAesKey.GetEncoded("base64")

    print("encrypted AES key = \(encryptedAesKey!)")

}