JavaScript Requires Chilkat v11.0.0+

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.

JavaScript

var success = false;

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

var http = new CkHttp();

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

console.log(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.
var jarr = new CkJsonArray();
success = jarr.Load(jsonStr);
if (success == false) {
    console.log("Failed to load JSON.");
    return;
}

// json: CkJsonObject
var json = jarr.ObjectAt(0);
var bdPkcs7 = new CkBinData();
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.
var crypt = new CkCrypt2();

//  Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
success = crypt.OpaqueVerifyBd(bdPkcs7);
if (success == false) {
    console.log(crypt.LastErrorText);
    return;
}

//  The signed content is the DER of a certificate.
//  In other words, bdPkcs7 now contains a certificate.
var cert = new CkCert();
success = cert.LoadFromBd(bdPkcs7);
if (success == false) {
    console.log(cert.LastErrorText);
    return;
}

//  Show some certificate information:
console.log("Subject: " + cert.SubjectDN);
console.log("Serial: " + cert.SerialNumber);
console.log("Issuer: " + cert.IssuerDN);

//  Let's get the cert's public key...
var pubKey = new CkPublicKey();
cert.GetPublicKey(pubKey);

//  OK, you now have the public key and can do whatever is needed..
console.log(pubKey.KeyType);
console.log(pubKey.KeySize);