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

See more Belgian eHealth Platform Examples

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.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

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

    let http = CkoHttp()!

    var jsonStr: String? = http.quickGetStr("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN")
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    print("\(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.
    let jarr = CkoJsonArray()!
    success = jarr.load(jsonStr)
    if success == false {
        print("Failed to load JSON.")
        return
    }

    var json: CkoJsonObject? = jarr.object(at: 0)
    let bdPkcs7 = CkoBinData()!
    bdPkcs7.appendEncoded(json!.string(of: "value"), encoding: "base64")
    json = nil

    // Let's verify the PKCS7, and then examine the signing cert,
    // and get the signing cert's public key.
    let crypt = CkoCrypt2()!

    // Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
    success = crypt.opaqueVerifyBd(bdPkcs7)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // The signed content is the DER of a certificate.
    // In other words, bdPkcs7 now contains a certificate.
    let cert = CkoCert()!
    success = cert.load(fromBd: bdPkcs7)
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    // Show some certificate information:
    print("Subject: \(cert.subjectDN!)")
    print("Serial: \(cert.serialNumber!)")
    print("Issuer: \(cert.issuerDN!)")

    // Let's get the cert's public key...
    let pubKey = CkoPublicKey()!
    cert.get(pubKey)

    // OK, you now have the public key and can do whatever is needed..
    print("\(pubKey.keyType!)")
    print("\(pubKey.keySize.intValue)")

}