public bool TryDecode(string code, out ProductLicense license)
{
// License format:
// No. Bytes Field Byte index
// 1 X 0
// 1 License flags 1
// 1 VersionNoApplicable 2
// 2 ExpirationDate 3
// 1 Y 5
// 1 ExpirationDays 6
// 1 ExpirationLoads 7
// 1 MaxSimultaneousUsers 8
// 1 Z 9
// X = random(0,255)
// Y = (byte[1] + byte[2] + byte[3] + byte[6] + byte[7] + byte[8]) % 255
// Z = (X^2 + Y^2) % 255
license = new ProductLicense();
if (string.IsNullOrEmpty(code))
{
return(false);
}
byte[] bytes = Base32Converter.FromBase32String(code.Replace("-", string.Empty));
if (bytes.Length != 10)
{
return(false);
}
bytes = bytes.Xor(ProductInformationServices.ProductInformation.ProductCode.ToByteArray());
// apply internal mask
StandardLicenseCodecTools.ApplyInternalMask(bytes);
int X = (int)bytes[0];
int Y = (int)bytes[5];
int Z = (int)bytes[9];
if (Y != (((int)bytes[1]) + ((int)bytes[2]) + ((int)bytes[3]) + ((int)bytes[6]) + ((int)bytes[7]) + ((int)bytes[8])) % 255)
{
return(false);
}
if ((X * X + Y * Y) % 255 != Z)
{
return(false);
}
license.Flags = (ProductLicenseFlags)bytes[1];
license.MajorVersionApplicable = bytes[2];
license.ExpirationDate = StandardLicenseCodecTools.FromDaysSince2008Jan1(BitConverter.ToUInt16(bytes, 3));
license.ExpirationDays = bytes[6];
license.ExpirationLoads = bytes[7];
license.MaxSimultaneousUsers = bytes[8];
return(true);
}
public override bool PerformAdditionalValidation(ProductLicense license)
{
bool valid = false;
if (license.VersionAware)
{
if (StandardLicenseTool.GetProductMajorVersion(ProductInformationServices.ProductInformation.ProductVersion) == license.MajorVersionApplicable)
{
valid = true;
}
}
else
{
valid = true;
}
return(valid);
}
public virtual bool PerformAdditionalValidation(ProductLicense license)
{
return(true);
}
public string GenerateKey(ProductLicense license)
{
// License format:
// No. Bytes Field Byte index
// 1 X 0
// 1 License flags 1
// 1 VersionNoApplicable 2
// 2 ExpirationDate 3
// 1 Y 5
// 1 ExpirationDays 6
// 1 ExpirationLoads 7
// 1 MaxSimultaneousUsers 8
// 1 Z 9
// X = random(0,255)
// Y = (byte[1] + byte[2] + byte[3] + byte[6] + byte[7] + byte[8]) % 255
// Z = (X^2 + Y^2) % 255
byte[] byteArray = new byte[10];
Tools.Maths.RandomNumberGenerator.NextBytes(byteArray);
byteArray[1] = (byte)license.Flags;
if (license.VersionAware)
{
byteArray[2] = license.MajorVersionApplicable;
}
if (license.ExpiresAfterDate)
{
Array.Copy(
BitConverter.GetBytes(StandardLicenseCodecTools.ToDaysSince2008Jan1(license.ExpirationDate)),
0,
byteArray,
3,
2
);
}
if (license.ExpiresAfterDays)
{
byteArray[6] = license.ExpirationDays;
}
if (license.ExpiresAfterLoads)
{
byteArray[7] = license.ExpirationLoads;
}
if (license.LimitSimultaneousUsers)
{
byteArray[8] = license.MaxSimultaneousUsers;
}
// add in license validity bytes
int X = Tools.Maths.RandomNumberGenerator.Next(0, 255);
int Y = (((int)byteArray[1]) + ((int)byteArray[2]) + ((int)byteArray[3]) + ((int)byteArray[6]) + ((int)byteArray[7]) + ((int)byteArray[8])) % 255;
int Z = (X * X + Y * Y) % 255;
byteArray[0] = (byte)X;
byteArray[5] = (byte)Y;
byteArray[9] = (byte)Z;
// apply internal mask
StandardLicenseCodecTools.ApplyInternalMask(byteArray);
// apply product code mask
byteArray = byteArray.Xor(ProductInformationServices.ProductInformation.ProductCode.ToByteArray());
return(Beutify(Base32Converter.ToBase32String(byteArray)));
}
protected virtual ProductRights DetermineRightsFromLicense(ProductLicense license)
{
var rights = ProductRights.None;
if (license.VersionAware)
{
rights.AppliesToVersion = true;
rights.Version = license.MajorVersionApplicable;
}
#region Get license data
if (license.DoesNotExpire)
{
rights.ExpiresAfterDate = false;
rights.HasFiniteDays = false;
rights.HasFiniteInstances = false;
rights.HasFiniteUses = false;
}
else
{
// Date
if (license.ExpiresAfterDate)
{
rights.ExpiresAfterDate = true;
rights.ExpirationDateUTC = license.ExpirationDate.ToUniversalTime();
}
else
{
rights.ExpiresAfterDate = false;
rights.ExpirationDateUTC = DateTime.MaxValue;
}
// Days
if (license.ExpiresAfterDays)
{
rights.HasFiniteDays = true;
rights.TotalDaysAllowed = license.ExpirationDays;
rights.DaysRemaining = (license.ExpirationDays - ProductUsageServices.ProductUsageInformation.DaysUsedBySystem + 1).ClipTo(0, int.MaxValue);
}
else
{
rights.HasFiniteDays = false;
rights.TotalDaysAllowed = int.MaxValue;
rights.DaysRemaining = int.MaxValue;
}
// Uses
if (license.ExpiresAfterLoads)
{
rights.HasFiniteUses = true;
rights.TotalUsesAllowed = license.ExpirationLoads;
rights.UsesRemaining = (license.ExpirationLoads - ProductUsageServices.ProductUsageInformation.NumberOfUsesBySystem + 1).ClipTo(0, int.MaxValue);
}
else
{
rights.HasFiniteUses = false;
rights.TotalUsesAllowed = int.MaxValue;
rights.UsesRemaining = int.MaxValue;
}
// Instances
if (license.LimitSimultaneousUsers)
{
rights.HasFiniteInstances = true;
rights.TotalInstancesAllowed = license.MaxSimultaneousUsers;
rights.InstancesRemaining = (license.MaxSimultaneousUsers - DuplicateProcessDetector.CountRunningInstancesOfThisApplication() + 1).ClipTo(0, int.MaxValue);
}
else
{
rights.HasFiniteInstances = false;
rights.TotalInstancesAllowed = int.MaxValue;
rights.InstancesRemaining = int.MaxValue;
}
}
// Get feature rights
if (license.LimitedFeatureSet)
{
rights.FeatureRights = ProductFeatureRights.Partial;
}
else
{
rights.FeatureRights = ProductFeatureRights.Full;
}
#endregion
// Determine if license has expired
bool hasExpired = false;
if (license.ExpiresAfterDate && DateTime.UtcNow > rights.ExpirationDateUTC)
{
hasExpired = true;
}
if (license.ExpiresAfterDays && rights.DaysRemaining == 0)
{
hasExpired = true;
}
if (license.ExpiresAfterLoads && rights.UsesRemaining == 0)
{
hasExpired = true;
}
if (license.LimitSimultaneousUsers && rights.InstancesRemaining == 0)
{
hasExpired = true;
}
// Apply expiration effect on license
if (hasExpired)
{
if (license.CrippleOnExpiration)
{
rights.FeatureRights = ProductFeatureRights.Partial;
}
if (license.DisableOnExpiration)
{
rights.FeatureRights = ProductFeatureRights.None;
}
}
return(rights);
}
