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(.NET Core C#) Create JWK Set Containing Certificates

Demonstrates how to create a JWK Set containing N certificates.

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// This example creates the following JWK Set from two certificates:

// {
//   "keys": [
//     {
//       "kty": "RSA",
//       "use": "sig",
//       "kid": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
//       "x5t": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
//       "n": "nYf1jpn7cFdQ...9Iw",
//       "e": "AQAB",
//       "x5c": [
//         "MIIDBTCCAe2...Z+NTZo"
//       ]
//     },
//     {
//       "kty": "RSA",
//       "use": "sig",
//       "kid": "M6pX7RHoraLsprfJeRCjSxuURhc",
//       "x5t": "M6pX7RHoraLsprfJeRCjSxuURhc",
//       "n": "xHScZMPo8F...EO4QQ",
//       "e": "AQAB",
//       "x5c": [
//         "MIIC8TCCAdmgA...Vt5432GA=="
//       ]
//     }
//   ]
// }

// First get two certificates from files.
Chilkat.Cert cert1 = new Chilkat.Cert();
bool success = cert1.LoadFromFile("qa_data/certs/brasil_cert.pem");
if (success != true) {
    Debug.WriteLine(cert1.LastErrorText);
    return;
}

Chilkat.Cert cert2 = new Chilkat.Cert();
success = cert2.LoadFromFile("qa_data/certs/testCert.cer");
if (success != true) {
    Debug.WriteLine(cert2.LastErrorText);
    return;
}

// We'll need this crypt object re-encode the SHA1 thumbprint from hex to base64.
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

Chilkat.JsonObject json = new Chilkat.JsonObject();

// Let's begin with the 1st cert:
json.I = 0;
json.UpdateString("keys[i].kty","RSA");
json.UpdateString("keys[i].use","sig");

string hexThumbprint = cert1.Sha1Thumbprint;
string base64Thumbprint = crypt.ReEncode(hexThumbprint,"hex","base64");
json.UpdateString("keys[i].kid",base64Thumbprint);
json.UpdateString("keys[i].x5t",base64Thumbprint);

// (We're assuming these are RSA certificates)
// To get the modulus (n) and exponent (e), we need to get the cert's public key and then get its JWK.
Chilkat.PublicKey pubKey = cert1.ExportPublicKey();
Chilkat.JsonObject pubKeyJwk = new Chilkat.JsonObject();
pubKeyJwk.Load(pubKey.GetJwk());

json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"));
json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"));

// Now add the entire X.509 certificate 
json.UpdateString("keys[i].x5c[0]",cert1.GetEncoded());

// Now do the same for cert2..
json.I = 1;

json.UpdateString("keys[i].kty","RSA");
json.UpdateString("keys[i].use","sig");

hexThumbprint = cert2.Sha1Thumbprint;
base64Thumbprint = crypt.ReEncode(hexThumbprint,"hex","base64");
json.UpdateString("keys[i].kid",base64Thumbprint);
json.UpdateString("keys[i].x5t",base64Thumbprint);

pubKey = cert2.ExportPublicKey();
pubKeyJwk.Load(pubKey.GetJwk());

json.UpdateString("keys[i].n",pubKeyJwk.StringOf("n"));
json.UpdateString("keys[i].e",pubKeyJwk.StringOf("e"));

// Now add the entire X.509 certificate 
json.UpdateString("keys[i].x5c[0]",cert2.GetEncoded());

// Emit the JSON..
json.EmitCompact = false;
Debug.WriteLine(json.Emit());

 

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