(Swift 3,4,5...) RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

Encrypts a string using RSAES-OAEP with SHA256 and AES-128 content encryption to produce PKCS7 output (base64 encoded).

Note: This example requires Chilkat v9.5.0.67 or greater.

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

    // First build a string to be encrypted
    let sb = CkoStringBuilder()!
    var i: Int = 1
    while i < 25 {
        sb.appendInt(i)
        sb.append(" the quick brown fox jumped over the lazy dog.\r\n")
        i = i + 1
    }

    print("\(sb.getAsString()!)")

    // The string to be encrypted looks like this:

    // 1 the quick brown fox jumped over the lazy dog.
    // 2 the quick brown fox jumped over the lazy dog.
    // 3 the quick brown fox jumped over the lazy dog.
    // 4 the quick brown fox jumped over the lazy dog.
    // 5 the quick brown fox jumped over the lazy dog.
    // 6 the quick brown fox jumped over the lazy dog.
    // ...

    // Load a digital certificate. 
    // We don't need the private key for encryption.
    // Only the public key is needed (which is included in a certificate).
    let cert = CkoCert()!
    var success: Bool = cert.load(fromFile: "qa_data/rsaes-oaep/cert.pem")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let crypt = CkoCrypt2()!

    // Tell the crypt object to use the certificate.
    crypt.setEncryptCert(cert)

    // Indicate that we want PKI encryption (i.e. public-key infrastructure)
    // to produce a CMS message (Cryptographic Message Syntax/PKCS7),
    // that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the
    // bulk encryption.
    crypt.cryptAlgorithm = "pki"
    crypt.pkcs7CryptAlg = "aes"
    crypt.keyLength = 128
    crypt.oaepHash = "sha256"
    crypt.oaepPadding = true

    // Also, don't forget to be specific about the character encoding (byte representation) of the
    // string to be encrypted.
    crypt.charset = "utf-8"

    // Now indicate that the PKCS7 output is to be returned in the base64 encoding.
    crypt.encodingMode = "base64"

    var base64Pkcs7: String? = crypt.encryptStringENC(sb.getAsString())
    if crypt.lastMethodSuccess != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Show the output
    print("\(base64Pkcs7!)")

    // This base64 can be copy-and-pasted into the form at http://lapo.it/asn1js/
    // to verify that all the chosen algorithms were indeed used.

    print("OK.")

}