(Swift 2) Renew a DigiCert Certificate from an EST-enabled profile

Demonstrates how to renew a certificate from an EST-enabled profile in DigiCert​​®​​ Trust Lifecycle Manager. (The certificate must be within the renewal window configured in the certificate profile. The CSR must have same Subject DN values as the original certificate.)

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.

    // The example below duplicates the following OpenSSL commands:
    // 
    // # Name of certificate as argument 1
    // 
    // # Make new key
    // openssl ecparam -name prime256v1 -genkey -noout -out ${1}.key.pem
    // 
    // # Make csr
    // openssl req -new -sha256 -key ${1}.key.pem -out ${1}.p10.csr -subj "/CN=${1}"
    // 
    // # Request new cert
    // curl -v --cacert data/ca.pem --cert data/${1}.pem --key data/${1}.key.pem 
    //     --data-binary @${1}.p10.csr -o ${1}.p7.b64 -H "Content-Type: application/pkcs10" https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll
    // 
    // # Convert to PEM
    // openssl base64 -d -in ${1}.p7.b64 | openssl pkcs7 -inform DER -outform PEM -print_certs -out ${1}.pem

    // ------------------------------------------------------------------------------------------------------------------

    // Create a Fortuna PRNG and seed it with system entropy.
    // This will be our source of random data for generating the ECC private key.
    let fortuna = CkoPrng()
    var entropy: String? = fortuna.GetEntropy(32, encoding: "base64")
    var success: Bool = fortuna.AddEntropy(entropy, encoding: "base64")

    let ec = CkoEcc()

    // Generate a random EC private key on the prime256v1 curve.
    var privKey: CkoPrivateKey? = ec.GenEccKey("prime256v1", prng: fortuna)
    if ec.LastMethodSuccess != true {
        print("\(ec.LastErrorText)")
        return
    }

    // Create the CSR object and set properties.
    let csr = CkoCsr()

    // Specify your CN
    csr.CommonName = "mysubdomain.mydomain.com"

    // Create the CSR using the private key.
    let bdCsr = CkoBinData()
    success = csr.GenCsrBd(privKey, csrData: bdCsr)
    if success == false {
        print("\(csr.LastErrorText)")
        privKey = nil
        return
    }

    // Save the private key and CSR to files.
    privKey!.SavePkcs8EncryptedPemFile("password", path: "c:/temp/qa_output/ec_privkey.pem")
    privKey = nil
    bdCsr.WriteFile("c:/temp/qa_output/csr.pem")

    // ----------------------------------------------------------------------
    // Now do the CURL request to POST the CSR and get the new certificate.

    let http = CkoHttp()

    let tlsClientCert = CkoCert()
    success = tlsClientCert.LoadFromFile("data/myTlsClientCert.pem")
    if success == false {
        print("\(tlsClientCert.LastErrorText)")
        return
    }

    let bdTlsClientCertPrivKey = CkoBinData()
    success = bdTlsClientCertPrivKey.LoadFile("data/myTlsClientCert.key.pem")
    if success == false {
        print("Failed to load data/myTlsClientCert.key.pem")
        return
    }

    let tlsClientCertPrivKey = CkoPrivateKey()
    success = tlsClientCertPrivKey.LoadAnyFormat(bdTlsClientCertPrivKey, password: "")
    if success == false {
        print("\(tlsClientCertPrivKey.LastErrorText)")
        return
    }

    success = tlsClientCert.SetPrivateKey(tlsClientCertPrivKey)
    if success == false {
        print("\(tlsClientCert.LastErrorText)")
        return
    }

    http.SetSslClientCert(tlsClientCert)

    http.RequireSslCertVerify = true

    // The body of the HTTP request contains the binary CSR.
    var resp: CkoHttpResponse? = http.PBinaryBd("POST", url: "https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll", data: bdCsr, contentType: "application/pkcs10", md5: false, gzip: false)
    if http.LastMethodSuccess == false {
        print("\(http.LastErrorText)")
        return
    }

    if resp!.StatusCode.intValue != 200 {
        print("response status code = \(resp!.StatusCode.intValue)")
        print("\(resp!.BodyStr)")
        print("Failed")
        resp = nil
        return
    }

    // The response is the Base64 DER of the new certificate.
    let myNewCert = CkoCert()
    success = myNewCert.LoadFromBase64(resp!.BodyStr)
    if success == false {
        print("\(myNewCert.LastErrorText)")
        print("Cert data = \(resp!.BodyStr)")
        print("Failed.")
        resp = nil
        return
    }

    resp = nil
    success = myNewCert.SaveToFile("c:/temp/qa_output/myNewCert.cer")
    if success == false {
        print("\(myNewCert.LastErrorText)")
        print("Failed.")
        return
    }

    print("Success.")

}