private static JToken EncryptPayloadPath(JToken json, string jsonPathIn, string jsonPathOut, JweConfig config)
{
JToken token = json.SelectToken(jsonPathIn);
if (JsonUtils.IsNullOrEmptyJson(token))
{
// Nothing to encrypt
return(json);
}
// Encode and encrypt
string inJsonString = JsonUtils.SanitizeJson(token.ToString(Formatting.None));
JweHeader header = new JweHeader(ALGORITHM, ENCRYPTION, config.EncryptionKeyFingerprint, CONTENT_TYPE);
string encrypted = JweObject.Encrypt(config, inJsonString, header);
// Delete data in the clear
if ("$".Equals(jsonPathIn))
{
// Create a new object
json = JObject.Parse("{}");
}
else
{
token.Parent.Remove();
}
JsonUtils.CheckOrCreateOutObject(json, jsonPathOut);
var outJsonToken = json.SelectToken(jsonPathOut) as JObject;
JsonUtils.AddOrReplaceJsonKey(outJsonToken, config.EncryptedValueFieldName, encrypted);
return(outJsonToken);
}
public static JweObject Parse(String encryptedPayload)
{
string[] fields = encryptedPayload.Trim().Split('.');
JweObject jweObject = new JweObject();
jweObject.RawHeader = fields[0];
jweObject.Header = JweHeader.Parse(jweObject.RawHeader);
jweObject.EncryptedKey = fields[1];
jweObject.Iv = fields[2];
jweObject.CipherText = fields[3];
jweObject.AuthTag = fields[4];
return(jweObject);
}
public static string Encrypt(JweConfig config, String payload, JweHeader header)
{
byte[] cek = AesEncryption.GenerateCek(256);
byte[] encryptedSecretKeyBytes = RsaEncryption.WrapSecretKey(config.EncryptionCertificate.GetRSAPublicKey(), cek, "SHA-256");
string encryptedKey = Base64Utils.URLEncode(encryptedSecretKeyBytes);
byte[] iv = AesEncryption.GenerateIV();
byte[] payloadBytes = Encoding.UTF8.GetBytes(payload);
string headerString = header.Json.ToString();
string encodedHeader = Base64Utils.URLEncode(Encoding.UTF8.GetBytes(headerString));
byte[] aad = Encoding.ASCII.GetBytes(encodedHeader);
var encrypted = AesGcm.Encrypt(cek, iv, payloadBytes, aad);
return(Serialize(encodedHeader, encryptedKey, Base64Utils.URLEncode(iv), Base64Utils.URLEncode(encrypted.Ciphertext), Base64Utils.URLEncode(encrypted.AuthTag)));
}
