//Token generation Method
public static dynamic generate_token()
{
try
{
//Initializing Response Dictionary for returning token in json format with required parameters
Dictionary <string, string> Response_Dictionary = new Dictionary <string, string>();
//creating dynamic object
dynamic objdata = new ExpandoObject();
//adding issuing time
objdata.issued_time = DateTime.UtcNow;
//adding expiry time
objdata.expiry_time = TOKEN_MODULE.generate_expiry_time();
//adding unique number for distinct token generation
objdata.unique_number = EDITIONAL_METHODS.unique_code_generator(16);
//adding issuer who issuing this token
objdata.issuer = get_issuer();
//adding audience who can use this token
objdata.audience = get_audience();
//adding roles who can access using this token
List <string> value = get_user_roles();
objdata.roles = value;
//serializing dynamic object into json string
string token_data = JsonConvert.SerializeObject(objdata);
//encrypt token json string using AES encryption
string encrypted_value = AES_MODULE.AES_ENCRYPTION_DATA(token_data, CORE_MODULE.TOKEN_AES_KEY, CORE_MODULE.TOKEN_AES_IV);
//adding generated token as access_token key pair value
CORE_MODULE.Response_Dictionary.Add("access_token", encrypted_value);
foreach (KeyValuePair <string, string> key_pair in CORE_MODULE.Response_Dictionary)
{
Response_Dictionary.Add(key_pair.Key, key_pair.Value);
}
//clearing parameters
CORE_MODULE.Response_Dictionary.Clear();
CORE_MODULE.roles.Clear();
return(Response_Dictionary);
}
catch (Exception ex)
{
throw new HttpResponseException(HttpStatusCode.BadRequest);
}
}
public static string ENCODE_DATA(dynamic dynamic_data)
{
string data = JsonConvert.SerializeObject(dynamic_data);
try
{
string final_data = string.Empty;
string ENCRYPTED_DATA = AES_MODULE.AES_ENCRYPTION_DATA(data, CORE_MODULE.SERVER_SIDE_AES_KEY, CORE_MODULE.SERVER_SIDE_AES_IV);
CLIEINT_AES_KEYS obj = new CLIEINT_AES_KEYS();
obj.KEY = CORE_MODULE.SERVER_SIDE_AES_KEY;
obj.IV = CORE_MODULE.SERVER_SIDE_AES_IV;
string AES_ENCRYPTIN_KEY_PAIR = JsonConvert.SerializeObject(obj);
string RSA_ENCRYPTED_KEY_PAIR = RSA_MODULE.RSA_Encrypt(AES_ENCRYPTIN_KEY_PAIR, RSA_MODULE.server_side_public_key_generator());
final_data = RSA_ENCRYPTED_KEY_PAIR + "." + ENCRYPTED_DATA;
return(final_data);
}
catch (Exception ex)
{
throw new HttpResponseException(HttpStatusCode.BadRequest);
}
}
public static string DECODE_DATA(string data)
{
try
{
string final_output = string.Empty;
if (string.IsNullOrEmpty(data))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
string[] values = data.Split('.');
string RSA_ENCRYPTED_AES_KEY = values[0].Replace(" ", "+");
string ENCRYPTED_DATA = values[1].Replace(" ", "+");
string AES_KEY_PAIR = RSA_MODULE.RSA_Decrypt(RSA_ENCRYPTED_AES_KEY, RSA_MODULE.server_side_private_key_generator());
if (string.IsNullOrEmpty(AES_KEY_PAIR))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
CLIEINT_AES_KEYS obj_AES = JsonConvert.DeserializeObject <CLIEINT_AES_KEYS>(AES_KEY_PAIR);
final_output = AES_MODULE.AES_DECRYPTION_DATA(ENCRYPTED_DATA, obj_AES.KEY, obj_AES.IV);
if (string.IsNullOrEmpty(final_output))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
return(final_output);
}
catch (Exception ex)
{
throw new HttpResponseException(HttpStatusCode.BadRequest);
}
}
public static string DECODE_DATA(string data)
{
string token_json_format = string.Empty;
string final_output = string.Empty;
//spliting string into string array
if (string.IsNullOrEmpty(data))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
string[] values = data.Split('.');
//assigning parameters
string TOKEN = values[0].Replace(" ", "+");
string RSA_ENCRYPTED_AES_KEY = values[1].Replace(" ", "+");
string ENCRYPTED_DATA = values[2].Replace(" ", "+");
try
{
//decrypting token to get token json string
token_json_format = AES_MODULE.AES_DECRYPTION_DATA(TOKEN, CORE_MODULE.TOKEN_AES_KEY, CORE_MODULE.TOKEN_AES_IV);
}
catch (Exception ex)
{
throw new HttpResponseException(HttpStatusCode.Unauthorized);
}
//converting json string into model object
TOKEN_MODEL token_params = JsonConvert.DeserializeObject <TOKEN_MODEL>(token_json_format);
//checking expiry time
if (!expiry_time_check(token_params.EXPIRY_TIME))
{
throw new HttpResponseException(HttpStatusCode.RequestTimeout);
}
//checking roles
if (!roles_check(token_params.ROLES, CORE_MODULE.roles))
{
throw new HttpResponseException(HttpStatusCode.Unauthorized);
}
//checking issuer
if (!issuer_check(token_params.ISSUER))
{
throw new HttpResponseException(HttpStatusCode.Unauthorized);
}
//checking audience
if (!audience_check(token_params.AUDIENCE))
{
throw new HttpResponseException(HttpStatusCode.Unauthorized);
}
try
{
//decrypting aes key pair for data decryption
string AES_KEY_PAIR = RSA_MODULE.RSA_Decrypt(RSA_ENCRYPTED_AES_KEY, RSA_MODULE.server_side_private_key_generator());
if (string.IsNullOrEmpty(AES_KEY_PAIR))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
//creating model object for key pair
CLIEINT_AES_KEYS obj_AES = JsonConvert.DeserializeObject <CLIEINT_AES_KEYS>(AES_KEY_PAIR);
//decryption of data using AES key pair
final_output = AES_MODULE.AES_DECRYPTION_DATA(ENCRYPTED_DATA, obj_AES.KEY, obj_AES.IV);
if (string.IsNullOrEmpty(final_output))
{
throw new HttpResponseException(HttpStatusCode.NoContent);
}
CORE_MODULE.roles.Clear();
//returning decrypted value
return(final_output);
}
catch (Exception ex)
{
throw new HttpResponseException(HttpStatusCode.BadRequest);
}
}
