MIME S/MIME Encryption Algorithm Properties

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Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!
    success = mime.setBody(fromPlainText: "This message will be encrypted.")
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    //  Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
    //  des, 3des, and rc2.  The default is aes.
    mime.pkcs7CryptAlg = "aes"

    //  Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
    mime.pkcs7KeyLength = 256

    //  OaepPadding selects the RSA key-transport padding.  The default is false (RSAES-PKCS1-v1_5).
    //  Set true to use RSAES-OAEP, in which case the OAEP hash settings apply.
    mime.oaepPadding = true
    mime.oaepHash = "sha256"
    mime.oaepMgfHash = "sha256"

    //  Load the recipient certificate (public key is sufficient for encrypting).
    let cert = CkoCert()!
    success = cert.load(fromFile: "qa_data/recipient.cer")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    //  Encrypt using the algorithm settings configured above.
    success = mime.encrypt(cert: cert)
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    print("Encrypted with \(mime.pkcs7CryptAlg!) \(mime.pkcs7KeyLength.intValue)-bit key.")

}