/// <summary>
/// Encodes this instance.
/// </summary>
/// <param name="payload">The payload.</param>
/// <param name="keyId">The key identifier.</param>
/// <param name="url">The URL.</param>
/// <param name="nonce">The nonce.</param>
/// <returns>The signed payload.</returns>
public JwsPayload Sign(
object payload,
Uri keyId = null,
Uri url = null,
string nonce = null)
{
var jsonSettings = JsonUtil.CreateSettings();
var protectedHeader = keyId == null ?
(object)new
{
alg = keyPair.Algorithm.ToJwsAlgorithm(),
jwk = keyPair.JsonWebKey,
nonce,
url,
} :
new
{
alg = keyPair.Algorithm.ToJwsAlgorithm(),
kid = keyId,
nonce,
url,
};
var entityJson = payload == null ?
"" :
JsonConvert.SerializeObject(payload, Formatting.None, jsonSettings);
var protectedHeaderJson = JsonConvert.SerializeObject(protectedHeader, Formatting.None, jsonSettings);
var payloadEncoded = JwsConvert.ToBase64String(Encoding.UTF8.GetBytes(entityJson));
var protectedHeaderEncoded = JwsConvert.ToBase64String(Encoding.UTF8.GetBytes(protectedHeaderJson));
var signature = $"{protectedHeaderEncoded}.{payloadEncoded}";
var signatureBytes = Encoding.UTF8.GetBytes(signature);
var signedSignatureBytes = keyPair.GetSigner().SignData(signatureBytes);
var signedSignatureEncoded = JwsConvert.ToBase64String(signedSignatureBytes);
var body = new JwsPayload
{
Protected = protectedHeaderEncoded,
Payload = payloadEncoded,
Signature = signedSignatureEncoded
};
return(body);
}