(Go) 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.

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

    http := chilkat.NewHttp()

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

    fmt.Println(*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 := chilkat.NewJsonArray()
    success := jarr.Load(*jsonStr)
    if success == false {
        fmt.Println("Failed to load JSON.")
        http.DisposeHttp()
        jarr.DisposeJsonArray()
        return
    }

    json := jarr.ObjectAt(0)
    bdPkcs7 := chilkat.NewBinData()
    bdPkcs7.AppendEncoded(*json.StringOf("value"),"base64")
    json.DisposeJsonObject()

    // Let's verify the PKCS7, and then examine the signing cert,
    // and get the signing cert's public key.
    crypt := chilkat.NewCrypt2()

    // Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
    success = crypt.OpaqueVerifyBd(bdPkcs7)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        http.DisposeHttp()
        jarr.DisposeJsonArray()
        bdPkcs7.DisposeBinData()
        crypt.DisposeCrypt2()
        return
    }

    // The signed content is the DER of a certificate.
    // In other words, bdPkcs7 now contains a certificate.
    cert := chilkat.NewCert()
    success = cert.LoadFromBd(bdPkcs7)
    if success == false {
        fmt.Println(cert.LastErrorText())
        http.DisposeHttp()
        jarr.DisposeJsonArray()
        bdPkcs7.DisposeBinData()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Show some certificate information:
    fmt.Println("Subject: ", cert.SubjectDN())
    fmt.Println("Serial: ", cert.SerialNumber())
    fmt.Println("Issuer: ", cert.IssuerDN())

    // Let's get the cert's public key...
    pubKey := cert.ExportPublicKey()
    if cert.LastMethodSuccess() == false {
        fmt.Println(cert.LastErrorText())
        http.DisposeHttp()
        jarr.DisposeJsonArray()
        bdPkcs7.DisposeBinData()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

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

    pubKey.DisposePublicKey()

    http.DisposeHttp()
    jarr.DisposeJsonArray()
    bdPkcs7.DisposeBinData()
    crypt.DisposeCrypt2()
    cert.DisposeCert()