(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

# 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.
$fortuna = New-Object Chilkat.Prng
$entropy = $fortuna.GetEntropy(32,"base64")
$success = $fortuna.AddEntropy($entropy,"base64")

$ec = New-Object Chilkat.Ecc

# Generate a random EC private key on the prime256v1 curve.
$privKey = $ec.GenEccKey("prime256v1",$fortuna)
if ($ec.LastMethodSuccess -ne $true) {
    $($ec.LastErrorText)
    exit
}

# Create the CSR object and set properties.
$csr = New-Object Chilkat.Csr

# Specify your CN
$csr.CommonName = "mysubdomain.mydomain.com"

# Create the CSR using the private key.
$bdCsr = New-Object Chilkat.BinData
$success = $csr.GenCsrBd($privKey,$bdCsr)
if ($success -eq $false) {
    $($csr.LastErrorText)

    exit
}

# Save the private key and CSR to files.
$privKey.SavePkcs8EncryptedPemFile("password","c:/temp/qa_output/ec_privkey.pem")

$bdCsr.WriteFile("c:/temp/qa_output/csr.pem")

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

$http = New-Object Chilkat.Http

$tlsClientCert = New-Object Chilkat.Cert
$success = $tlsClientCert.LoadFromFile("data/myTlsClientCert.pem")
if ($success -eq $false) {
    $($tlsClientCert.LastErrorText)
    exit
}

$bdTlsClientCertPrivKey = New-Object Chilkat.BinData
$success = $bdTlsClientCertPrivKey.LoadFile("data/myTlsClientCert.key.pem")
if ($success -eq $false) {
    $("Failed to load data/myTlsClientCert.key.pem")
    exit
}

$tlsClientCertPrivKey = New-Object Chilkat.PrivateKey
$success = $tlsClientCertPrivKey.LoadAnyFormat($bdTlsClientCertPrivKey,"")
if ($success -eq $false) {
    $($tlsClientCertPrivKey.LastErrorText)
    exit
}

$success = $tlsClientCert.SetPrivateKey($tlsClientCertPrivKey)
if ($success -eq $false) {
    $($tlsClientCert.LastErrorText)
    exit
}

$http.SetSslClientCert($tlsClientCert)

$http.RequireSslCertVerify = $true

# The body of the HTTP request contains the binary CSR.
$resp = $http.PBinaryBd("POST","https://clientauth.demo.one.digicert.com/.well-known/est/IOT/simplereenroll",$bdCsr,"application/pkcs10",$false,$false)
if ($http.LastMethodSuccess -eq $false) {
    $($http.LastErrorText)
    exit
}

if ($resp.StatusCode -ne 200) {
    $("response status code = " + $resp.StatusCode)
    $($resp.BodyStr)
    $("Failed")

    exit
}

# The response is the Base64 DER of the new certificate.
$myNewCert = New-Object Chilkat.Cert
$success = $myNewCert.LoadFromBase64($resp.BodyStr)
if ($success -eq $false) {
    $($myNewCert.LastErrorText)
    $("Cert data = " + $resp.BodyStr)
    $("Failed.")

    exit
}

$success = $myNewCert.SaveToFile("c:/temp/qa_output/myNewCert.cer")
if ($success -eq $false) {
    $($myNewCert.LastErrorText)
    $("Failed.")
    exit
}

$("Success.")