Swift

Sign String to create a CAdES-T Signature, using HTTP Proxy to Access Timestamp Server

This example will sign a string to create a CAdEST-T signature. It will use an HTTP proxy to access the timestamp server. Swift

func chilkatTest() {
    var success: Bool = false

    let crypt = CkoCrypt2()!

    let cert = CkoCert()!
    cert.smartCardPin = "123456"
    success = cert.load(fromSmartcard: "")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    success = crypt.setSigningCert(cert: cert)

    // Use SHA-256 rather than the default of SHA-1
    crypt.hashAlgorithm = "sha256"

    // Create JSON that tells Chilkat what signing attributes to include:
    let attrs = CkoJsonObject()!
    attrs.updateBool(jsonPath: "contentType", value: true)
    attrs.updateBool(jsonPath: "signingTime", value: true)
    attrs.updateBool(jsonPath: "messageDigest", value: true)
    attrs.updateBool(jsonPath: "signingCertificateV2", value: true)

    // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
    // We must include the TSA's URL, as well as a few options to indicate what is desired.
    // Except for the TSA URL, the options shown here are typically what you would need.
    attrs.updateBool(jsonPath: "timestampToken.enabled", value: true)
    attrs.updateString(jsonPath: "timestampToken.tsaUrl", value: "https://freetsa.org/tsr")
    attrs.updateBool(jsonPath: "timestampToken.addNonce", value: false)
    attrs.updateBool(jsonPath: "timestampToken.requestTsaCert", value: true)
    attrs.updateString(jsonPath: "timestampToken.hashAlg", value: "sha256")

    crypt.signingAttributes = attrs.emit()

    var strToSign: String? = "Hello World!"

    let bd = CkoBinData()!
    bd.appendString(str: strToSign, charset: "utf-8")

    // -------------------------------------------------------------------------
    // The purpose of this example is to show how an HTTP object with custom
    // settings can be used to access the Internet when signing.
    // Access to the Internet is needed to communicate with the timestamp server.
    let http = CkoHttp()!
    // This can be a domain name, hostname, or IP address.
    http.proxyDomain = "172.16.16.56"
    http.proxyPort = 808
    http.proxyLogin = "myProxyLogin"
    http.proxyPassword = "myProxyPassword"
    crypt.setTsaHttpObj(http: http)
    // -------------------------------------------------------------------------

    // This creates the CAdES-T signature.  During the signature creation, it
    // communicates with the TSA to get a timestampToken.
    // The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
    success = crypt.opaqueSignBd(bd: bd)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Get the signature in base64 format:
    print("\(bd.getEncoded(encoding: "base64_mime")!)")

    print("Success.")

}