(PowerShell) Get ETK Public Key (api-acpt.ehealth.fgov.be)

See more Belgian eHealth Platform Examples

The following URL returns JSON, which contains a PKCS7 signed data:

https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN

This example extracts the signed data, validates it, and then extracts the public key from the certificate (obtained from signed content in the PKCS7)

Note: The URL above uses "12345678901" which is not valid. You should replace it with a valid number.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$http = New-Object Chilkat.Http

$jsonStr = $http.QuickGetStr("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN")
if ($http.LastMethodSuccess -eq $false) {
    $($http.LastErrorText)
    exit
}

$($jsonStr)

# The JSON contains something like this:

# [
#     {
#         "key": {
#             "applicationIdentifier": "",
#             "ssin": "12345678901"
#         },
#         "value": "MIAGCSq....AAAAAAAA=="
#     }
# ]

# Note: The above is a JSON array (not a JSON object)
# It should be loaded into a Chilkat JSON array.
$jarr = New-Object Chilkat.JsonArray
$success = $jarr.Load($jsonStr)
if ($success -eq $false) {
    $("Failed to load JSON.")
    exit
}

$json = $jarr.ObjectAt(0)
$bdPkcs7 = New-Object Chilkat.BinData
$bdPkcs7.AppendEncoded($json.StringOf("value"),"base64")

# Let's verify the PKCS7, and then examine the signing cert,
# and get the signing cert's public key.
$crypt = New-Object Chilkat.Crypt2

# Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
$success = $crypt.OpaqueVerifyBd($bdPkcs7)
if ($success -eq $false) {
    $($crypt.LastErrorText)
    exit
}

# The signed content is the DER of a certificate.
# In other words, bdPkcs7 now contains a certificate.
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromBd($bdPkcs7)
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

# Show some certificate information:
$("Subject: " + $cert.SubjectDN)
$("Serial: " + $cert.SerialNumber)
$("Issuer: " + $cert.IssuerDN)

# Let's get the cert's public key...
$pubKey = $cert.ExportPublicKey()
if ($cert.LastMethodSuccess -eq $false) {
    $($cert.LastErrorText)
    exit
}

# OK, you now have the public key and can do whatever is needed..
$($pubKey.KeyType)
$($pubKey.KeySize)