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

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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.

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#include <CkHttp.h>
#include <CkJsonArray.h>
#include <CkJsonObject.h>
#include <CkBinData.h>
#include <CkCrypt2.h>
#include <CkCert.h>
#include <CkPublicKey.h>

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

    CkHttp http;

    const char *jsonStr = http.quickGetStr("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << jsonStr << "\r\n";

    // 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.
    CkJsonArray jarr;
    bool success = jarr.Load(jsonStr);
    if (success == false) {
        std::cout << "Failed to load JSON." << "\r\n";
        return;
    }

    CkJsonObject *json = jarr.ObjectAt(0);
    CkBinData bdPkcs7;
    bdPkcs7.AppendEncoded(json->stringOf("value"),"base64");
    delete json;

    // Let's verify the PKCS7, and then examine the signing cert,
    // and get the signing cert's public key.
    CkCrypt2 crypt;

    // Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
    success = crypt.OpaqueVerifyBd(bdPkcs7);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // The signed content is the DER of a certificate.
    // In other words, bdPkcs7 now contains a certificate.
    CkCert cert;
    success = cert.LoadFromBd(bdPkcs7);
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    // Show some certificate information:
    std::cout << "Subject: " << cert.subjectDN() << "\r\n";
    std::cout << "Serial: " << cert.serialNumber() << "\r\n";
    std::cout << "Issuer: " << cert.issuerDN() << "\r\n";

    // Let's get the cert's public key...
    CkPublicKey *pubKey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    // OK, you now have the public key and can do whatever is needed..
    std::cout << pubKey->keyType() << "\r\n";
    std::cout << pubKey->get_KeySize() << "\r\n";

    delete pubKey;
    }