Swift

Renew a DigiCert Certificate from an EST-enabled profile

See more Certificates Examples

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.) Swift

func chilkatTest() {
    var success: Bool = false

    // 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(numBytes: 32, encoding: "base64")
    success = fortuna.addEntropy(entropy: entropy, encoding: "base64")

    let ec = CkoEcc()!

    // Generate a random EC private key on the prime256v1 curve.
    let privKey = CkoPrivateKey()!
    success = ec.genKey(curveName: "prime256v1", prng: fortuna, privKey: privKey)
    if success != 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.genBd(privKey: privKey, csrData: bdCsr)
    if success == false {
        print("\(csr.lastErrorText!)")
        return
    }

    // Save the private key and CSR to files.
    privKey.savePkcs8EncryptedPemFile(password: "password", path: "c:/temp/qa_output/ec_privkey.pem")

    bdCsr.writeFile(path: "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.load(fromFile: "data/myTlsClientCert.pem")
    if success == false {
        print("\(tlsClientCert.lastErrorText!)")
        return
    }

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

    let tlsClientCertPrivKey = CkoPrivateKey()!
    success = tlsClientCertPrivKey.loadAnyFormat(privKeyData: bdTlsClientCertPrivKey, password: "")
    if success == false {
        print("\(tlsClientCertPrivKey.lastErrorText!)")
        return
    }

    success = tlsClientCert.setPrivateKey(privKey: tlsClientCertPrivKey)
    if success == false {
        print("\(tlsClientCert.lastErrorText!)")
        return
    }

    http.setSslClientCert(cert: tlsClientCert)

    http.requireSslCertVerify = true

    // The body of the HTTP request contains the binary CSR.
    let resp = CkoHttpResponse()!
    var url: String? = "https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll"
    success = http.httpBd(verb: "POST", url: url, bd: bdCsr, contentType: "application/pkcs10", response: resp)
    if success == false {
        print("\(http.lastErrorText!)")
        return
    }

    if resp.statusCode.intValue != 200 {
        print("response status code = \(resp.statusCode.intValue)")
        print("\(resp.bodyStr!)")
        print("Failed")
        return
    }

    // The response is the Base64 DER of the new certificate.
    let myNewCert = CkoCert()!
    success = myNewCert.load(fromBase64: resp.bodyStr)
    if success == false {
        print("\(myNewCert.lastErrorText!)")
        print("Cert data = \(resp.bodyStr!)")
        print("Failed.")
        return
    }

    success = myNewCert.save(toFile: "c:/temp/qa_output/myNewCert.cer")
    if success == false {
        print("\(myNewCert.lastErrorText!)")
        print("Failed.")
        return
    }

    print("Success.")

}