/// <summary>
/// This method saves all information inside key information into a file.
/// </summary>
/// <param name="keyInformation">The key infromation that should be saved into a file</param>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
public static void SaveKeyInformationToFile(KeyInformation keyInformation, string file)
{
var bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
var fs = new System.IO.FileStream(file, System.IO.FileMode.OpenOrCreate);
bf.Serialize(fs, keyInformation);
fs.Close();
}
/// <summary>
/// Checks that the Key Information object is valid (in the correct format). You can always add constraints
/// such as @<see cref="HasNotExpired"/>.
/// </summary>
/// <param name="keyInformation"></param>
/// <returns>Returns true if the object is valid and false otherwise.</returns>
public static bool IsValid(this KeyInformation keyInformation)
{
if (keyInformation != null)
{
return(true);
}
return(false);
}
/// <summary>
/// Checks so that the machine code corresponds to the machine code of this computer.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="hashFunction">A hash function used to hash the current computer's parameters.</param>
/// <returns></returns>
public static KeyInformation IsOnRightMachine(this KeyInformation keyInformation, Func <string, string> hashFunction)
{
if (keyInformation != null && SKM.getMachineCode(hashFunction)
.Equals(keyInformation.Mid))
{
return(keyInformation);
}
return(null);
}
/// <summary>
/// This method loads key information stored in a file into a key information variable.
/// </summary>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
/// <returns></returns>
public static KeyInformation LoadKeyInformationFromFile(string file)
{
var bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
var fs = new System.IO.FileStream(file, System.IO.FileMode.Open);
KeyInformation keyInfo = (KeyInformation)bf.Deserialize(fs);
fs.Close();
return(keyInfo);
}
/// <summary>
/// Checks so that a certain Feature is disabled (i.e. it's set to FALSE).
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="featureNumber">The feature number, eg. feature1, feature 2, etc. FeatureNumber can be 1,2,...,8.</param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation HasNotFeature(this KeyInformation keyInformation, int featureNumber)
{
if (keyInformation != null && featureNumber <= 8 &&
featureNumber >= 1 &&
!keyInformation.Features[featureNumber - 1])
{
return(keyInformation);
}
return(null);
}
/// <summary>
/// Save the current object into a file. It can be read using @<see cref="LoadFromFile"/>.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
/// <param name="json">If the file is stored in JSON (eg. an activation file with .skm extension), set this parameter to TRUE.</param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
/// <remarks>This method does not use the same JSON format structure as activation files. Instead,
/// if you want to read these files using <see cref="LoadFromFile"/>, then activationFile has
/// to be set to FALSE.</remarks>
public static KeyInformation SaveToFile(this KeyInformation keyInformation, string file = "", bool json = false)
{
if (keyInformation != null)
{
if (SKGL.SKM.SaveKeyInformationToFile(keyInformation, file, json))
{
return(keyInformation);
}
}
return(null);
}
/// <summary>
/// Checks that the Key Information object is valid (in the correct format). You can always add constraints
/// such as @<see cref="HasNotExpired"/>.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="rsaPublicKey">The public key (RSA). It can be found here: https://serialkeymanager.com/User/Security </param>
/// <returns>Returns true if the object is valid and false otherwise.</returns>
public static bool IsValid(this KeyInformation keyInformation, string rsaPublicKey)
{
if (keyInformation != null)
{
if (!SKGL.SKM.IsKeyInformationGenuine(keyInformation, rsaPublicKey))
{
return(false);
}
return(true);
}
return(false);
}
/// <summary>
/// Checks that they key has not expired (i.e. the expire date has not been reached).
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="checkWithInternetTime">If set to true, we will also check that the local
/// time (on the client computer) has not been changed (using SKM.TimeCheck).
/// </param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation HasNotExpired(this KeyInformation keyInformation, bool checkWithInternetTime = false)
{
if (keyInformation != null)
{
TimeSpan ts = keyInformation.ExpirationDate - DateTime.Today;
if (ts.Days >= 0)
{
if (checkWithInternetTime && SKGL.SKM.TimeCheck())
{
return(null);
}
return(keyInformation);
}
}
return(null);
}
/// <summary>
/// Checks that this object has a valid signature, which means that the content has not been altered
/// after that it was generated by Serial Key Manager.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="rsaPublicKey">The public key (RSA). It can be found here: https://serialkeymanager.com/User/Security </param>
/// <param name="signatureExpireInterval">If the activation object contains an activation date (when signDate=true),
/// this method will check so that no more than "signatureExpirationInterval" days have passed since the last activation.
/// </param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation HasValidSignature(this KeyInformation keyInformation, string rsaPublicKey, int?signatureExpirationInterval)
{
if (keyInformation != null)
{
if (SKGL.SKM.IsKeyInformationGenuine(keyInformation, rsaPublicKey))
{
if (signatureExpirationInterval.HasValue && keyInformation.Date.HasValue)
{
TimeSpan ts = DateTime.Today - keyInformation.Date.Value;
if (ts.Days >= signatureExpirationInterval.Value)
{
return(null);
}
}
return(keyInformation);
}
}
return(null);
}
/// <summary>
/// This method will interpret the input from the dictionary that was returned through "GetParameters" method, if the action was either "activate" or "validate".
/// </summary>
/// <param name="parameters">The dictionary array returned in "GetParameters" method</param>
/// <returns>A Key Information object</returns>
public static KeyInformation GetKeyInformationFromParameters(Dictionary <string, string> parameters)
{
var ki = new KeyInformation();
if (parameters.ContainsKey("error"))
{
return(null);
}
ki.Valid = true;
ki.CreationDate = Convert.ToDateTime(parameters["created"]);
ki.ExpirationDate = Convert.ToDateTime(parameters["expires"]);
ki.SetTime = Convert.ToInt32(parameters["settime"]);
ki.TimeLeft = Convert.ToInt32(parameters["timeleft"]);
ki.Features = new bool[] { Convert.ToBoolean(parameters["f1"]), Convert.ToBoolean(parameters["f2"]),
Convert.ToBoolean(parameters["f3"]), Convert.ToBoolean(parameters["f4"]),
Convert.ToBoolean(parameters["f5"]), Convert.ToBoolean(parameters["f6"]),
Convert.ToBoolean(parameters["f7"]), Convert.ToBoolean(parameters["f8"]) };
if (parameters.ContainsKey("notes"))
{
ki.Notes = parameters["notes"];
}
if (parameters.ContainsKey("signature"))
{
ki.Signature = parameters["signature"];
}
if (parameters.ContainsKey("newkey"))
{
ki.NewKey = parameters["newkey"];
}
if (parameters.ContainsKey("mid"))
{
ki.Mid = parameters["mid"];
}
return(ki);
}
/// <summary>
/// This method allows you to check if the key information (creation date, expiration date, etc.) in a request was modified on the way from Serial Key Manager server to the client application.
/// </summary>
/// <param name="keyInformation">The variable that contains the key information (including the signature)</param>
/// <param name="rsaPublicKey">The public key (RSA)</param>
/// <returns>True, if no changes were detected. False, otherwise.</returns>
public static bool IsKeyInformationGenuine(KeyInformation keyInformation, string rsaPublicKey)
{
byte[] data = GetBytes(keyInformation.Valid.ToString() + keyInformation.CreationDate.ToString("yyyy-MM-dd") + keyInformation.ExpirationDate.ToString("yyyy-MM-dd")
+ keyInformation.SetTime.ToString() + keyInformation.TimeLeft.ToString() +
keyInformation.Features[0].ToString() +
keyInformation.Features[1].ToString() +
keyInformation.Features[2].ToString() +
keyInformation.Features[3].ToString() +
keyInformation.Features[4].ToString() +
keyInformation.Features[5].ToString() +
keyInformation.Features[6].ToString() +
keyInformation.Features[7].ToString() +
(keyInformation.Notes == null ? "": keyInformation.Notes) +
(keyInformation.Mid == null ? "" : keyInformation.Mid)
);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048);
rsa.FromXmlString(rsaPublicKey);
byte[] signature = Convert.FromBase64String(keyInformation.Signature);
return(rsa.VerifyData(data, "SHA256", signature));
}
/// <summary>
/// Checks that this object has a valid signature, which means that the content has not been altered
/// after that it was generated by Serial Key Manager.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="rsaPublicKey">The public key (RSA). It can be found here: https://serialkeymanager.com/User/Security </param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation HasValidSignature(this KeyInformation keyInformation, string rsaPublicKey)
{
return(HasValidSignature(keyInformation, rsaPublicKey, null));
}
/// <summary>
/// Checks so that the machine code corresponds to the machine code of this computer.
/// The default hash function is SHA1.
/// </summary>
/// <param name="keyInformation"></param>
/// <returns></returns>
public static KeyInformation IsOnRightMachine(this KeyInformation keyInformation)
{
return(IsOnRightMachine(keyInformation, SKM.getSHA1));
}
/// <summary>
/// Load a saved object from file (using @<see cref="SaveToFile"/>).
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
/// <param name="json">If the file is stored in JSON (eg. an activation file with .skm extension), set this parameter to TRUE.</param>
/// <param name="activationFile">If you obtained this file from an Activation Form (.skm extension), this should be set to true.</param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation LoadFromFile(this KeyInformation keyInformation, string file = "", bool json = false, bool activationFile = false)
{
return(SKGL.SKM.LoadKeyInformationFromFile(file, json, activationFile));
}
/// <summary>
/// Load a saved object from file (using @<see cref="SaveToFile"/>).
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation LoadFromFile(this KeyInformation keyInformation, string file = "")
{
return(LoadFromFile(keyInformation, file, json: false, activationFile: false));
}
/// <summary>
/// Save the current object into a file. It can be read using @<see cref="LoadFromFile"/>.
/// </summary>
/// <param name="keyInformation"></param>
/// <param name="file">The entire path including file name, i.e. c:\folder\file.txt</param>
/// <returns>A key information object if the condition is satisfied. Null otherwise.</returns>
public static KeyInformation SaveToFile(this KeyInformation keyInformation, string file = "")
{
return(SaveToFile(keyInformation, file, json: false));
}