(Swift) Create PKCS7 (CMS) EnvelopedData

Encrypt some data to a recipient by creating a PKCS7 (CMS) EnvelopedData structure. The data will be encrypted using a symmetric content-encryption algorithm (e.g., AES), and the randomly generated symmetric key will be encrypted using the recipient’s RSA public key extracted from their X.509 certificate.

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func chilkatTest() {
    let crypt = CkoCrypt2()!

    // Specify the encryption to be used.
    // "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped-data) message.
    crypt.cryptAlgorithm = "pki"
    crypt.pkcs7CryptAlg = "aes"
    crypt.keyLength = 256
    crypt.oaepHash = "sha256"
    crypt.oaepPadding = true

    let cert = CkoCert()!

    // Use a certificate found in the Windows certificate store.
    var success: Bool = cert.load(byCommonName: "My Certificate")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

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

    var toBeEncrypted: String? = "This string is to be encrypted."

    // Get the result in multi-line BASE64 MIME format.
    crypt.encodingMode = "base64_mime"
    crypt.charset = "utf-8"

    var result: String? = crypt.encryptStringENC(toBeEncrypted)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // -------------------------------------------------------------------------
    // See the following example to decrypt what was created in this example
    // Decrypt PKCS7 (CMS) EnvelopedData
    // -------------------------------------------------------------------------

    print("\(result!)")

    // Sample output:

    // MIICSgYJKoZIhvcNAQcDoIICOzCCAjcCAQAxggHiMIIB3gIBADCBljCBgTELMAkGA1UEBhMCSVQx
    // EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
    // dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
    // MwIQPCWvkSv8oQ7xRmEHJ6TzEDA8BgkqhkiG9w0BAQcwL6APMA0GCWCGSAFlAwQCAQUAoRwwGgYJ
    // KoZIhvcNAQEIMA0GCWCGSAFlAwQCAQUABIIBAKqHAPQNSsQoX7B2NH7QyEOWQRsSVs8oCHXmy8f4
    // MVZD2er3bvYUCIomxpwbLEAl14qjUIMynahooYGgqip7+4FqL301G+BVjZVfEhHWj+VI1dAWnWuL
    // VHlvc/pbQNBWqV8rKVJsNIsuAZkdj4WSwLVKxYkYX43B8fh/g71XN2DTJu7Z/824v48KBmgpQBOT
    // 2q7IcDGxNPAFN2p6eavIVGn2LvhEbf/Fszyj+GR5tMcnQP1BOLJ3s3JzUBbvj8hcZrF1Vhl9HnTU
    // YQx8G/KdW1mR+Wlhl3BWoK0LYKRTbnTx2BXOs0CY1SXOAdhKr01ZYjA+xW4nGzY0lfXS9QZjh9gw
    // TAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBKgQQw0xTbfmnt0zjWHo5SaQIp4AgxTVY9E/Ncqy6t+RM
    // 8y4c3Av62/wB8IpPUEmtM2OeuZo=

}