Only set this setting if you plan to target Windows only. It's only necessary in rare cases. If you have any questions, please contact [email protected].

Declaration

public static bool WindowsOnly { get; set; }

Property Value

Type	Description
bool

Methods

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ComputePasswordHash(string)

Computes a string hash of a password using PBKDF2. Note, in comparison to using hash algorithms such as SHA256, the algorithm used in this method slows down the computation on purpose, to make sure it is harder to guess the original password.

Declaration

public static string ComputePasswordHash(string password)

Parameters

Type	Name	Description
string	password

Returns

Type	Description
string

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ComputePasswordHash(string, byte[])

Declaration

public static string ComputePasswordHash(string password, byte[] salt = null)

Parameters

Type	Name	Description
string	password
byte[]	salt

Returns

Type	Description
string

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GetAssemblyHash()

Computes the method of the entry assembly. This method is intended to be called from an SDK that you want to protect. The "Entry Assembly" is the first assembly that leads to a method being called in your SDK.

Normally, if a customer uses your SDK in an assembly A, this method will compute the hash/fingerprint of that assembly. If they have developed two assemblies, where the A uses B and B uses your SDK (which calls this method), i.e. A -> B -> SDK, then the hash is computed of the first assembly, i.e. A.

Declaration

public static AssemblySignature GetAssemblyHash()

Returns

Type	Description
AssemblySignature	An AssemblySignature or null if the file cannot be found and/or cannot be read.

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GetAssemblyHash(string)

Declaration

public static AssemblySignature GetAssemblyHash(string path)

Parameters

Type	Name	Description
string	path	Allows you to specify a custom path of the assembly to sign. If null, the default assembly will be signed, as described in the summary.

Returns

Type	Description
AssemblySignature	An AssemblySignature or null if the file cannot be found and/or cannot be read.

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GetFloatingLicenseInformation(ActivateModel, KeyInfoResult)

Returns floating license related information.

Declaration

public static FloatingLicenseInformation GetFloatingLicenseInformation(ActivateModel activationModel, KeyInfoResult activationResult)

Parameters

Type	Name	Description
ActivateModel	activationModel
KeyInfoResult	activationResult

Returns

Type	Description
FloatingLicenseInformation

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GetFloatingLicenseInformation(int, int, int)

Returns floating license related information.

Declaration

public static FloatingLicenseInformation GetFloatingLicenseInformation(int MaxOverdraft, int MaxNoOfMachines, int UsedFloatingMachines)

Parameters

Type	Name	Description
int	MaxOverdraft
int	MaxNoOfMachines
int	UsedFloatingMachines

Returns

Type	Description
FloatingLicenseInformation

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GetHardiskId()

An alternative way to compute the machine code by relying on the Hardisk Id (assigned by the manufacturer). This is different from Volume Id. Please note: although based on our testing, it should run without admin access, this might not be the case on some machines. Furthermore, this method is specific to Windows and cannot be used on other platforms.

Declaration

public static string GetHardiskId()

Returns

Type	Description
string

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GetMACAddress()

Computes the MAC address, which can be used as a way to identify a machine uniquely.

Declaration

public static string GetMACAddress()

Returns

Type	Description
string

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GetMachineCode(bool, int)

Returns the machine code of the current device with SHA-256 as the hash function. This method works differently depending on the binaries that you use. By default, machine code is computed using COM, which requires System.Management. This is only supported on Windows, it's better to set platformIndependent=true. If you use a version of library without System.Management, the platform independent machine code will be computed by default.

The supported platforms are Windows, Mac and Linux. Note, sudo access is required if Linux is used.

In newer projects, we recommend to always set platformIndependent=true or use GetMachineCodePI().

If version is set to 2, you can get the machine code as in the Python client, assuming similar settings are used. You can read more about it here: https://help.cryptolens.io/faq/index#machine-code-generation

Declaration

public static string GetMachineCode(bool platformIndependent = false, int v = 1)

Parameters

Type	Name	Description
bool	platformIndependent
int	v

Returns

Type	Description
string

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GetMachineCodePI()

Computes a platform independent machine code that works on Windows, Linux and Mac and does not require System.Management.

Note: On Linux, sudo access is necessary.

Declaration

public static string GetMachineCodePI()

Returns

Type	Description
string

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GetMachineCodePI(int)

Computes a platform independent machine code that works on Windows, Linux and Mac and does not require System.Management.

Note: On Linux, sudo access is necessary.

Declaration

public static string GetMachineCodePI(int v = 1)

Parameters

Type	Name	Description
int	v

Returns

Type	Description
string

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GetOSStats()

Creates a JSON dictionary of the type MachineInfo, which contains OSVersion, OSName and Is64Bit (not available in NET 3.5).

Declaration

public static string GetOSStats()

Returns

Type	Description
string	A string representation of the JSON dictionary.

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GetPlatform()

Declaration

public static Helpers.OSType GetPlatform()

Returns

Type	Description
Helpers.OSType

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HasFeature(LicenseKey, int)

Checks so that a certain Feature is enabled (i.e. it's set to TRUE).

Declaration

public static bool HasFeature(LicenseKey licenseKey, int featureNumber)

Parameters

Type	Name	Description
LicenseKey	licenseKey
int	featureNumber	The feature number, eg. feature1, feature 2, etc. FeatureNumber can be 1,2,...,8.

Returns

Type	Description
bool	A key information object if the condition is satisfied. Null otherwise.

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HasFeature(LicenseKey, string)

Uses a special data object associated with the license key to determine if a certain feature exists (instead of the 8 feature flags).

Formatting: The name of the data object should be 'cryptolens_features' and it should be structured as a JSON array.

For example,

["f1", "f2"]

means f1 and f2 are true. You can also have feature bundling, eg.

["f1", ["f2",["voice","image"]]]

which means that f1 and f2 are true, as well as f2.voice and f2.image. You can set any depth, eg. you can have

["f1", ["f2",[["voice",["all"]], "image"]]]

means f2.voice.all is true as well as f2.voice and f2. The dots symbol is used to specify the "sub-features".

Read more here: https://help.cryptolens.io/web-interface/feature-templates

Declaration

public static bool HasFeature(LicenseKey licenseKey, string featureName)

Parameters

Type	Name	Description
LicenseKey	licenseKey	The license key
string	featureName	For example, "f2.voice.all".

Returns

Type	Description
bool

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IsOnRightMachine(LicenseKey, bool, bool, bool)

Checks if the current license key is on the correct device with SHA-256 as the hash function.

Declaration

public static bool IsOnRightMachine(LicenseKey licenseKey, bool isFloatingLicense = false, bool allowOverdraft = false, bool platformIndependent = false)

Parameters

Type	Name	Description
LicenseKey	licenseKey	The license key object.
bool	isFloatingLicense	If this is a floating license, this parameter has to be set to true. You can enable floating licenses by setting FloatingTimeInterval to a value greater than 0.
bool	allowOverdraft	If floating licensing is enabled with overdraft, this parameter should be set to true. You can enable overdraft by setting MaxOverdraft to a value greater than 0.
bool	platformIndependent	Allows you to specify if you want to use the old machine code method that is based on COM and requires System.Management or use the new platform independent method, i.e. GetMachineCodePI().

Returns

Type	Description
bool

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IsOnRightMachine(LicenseKey, string, bool, bool)

Checks if the current license key is on the correct device with SHA-256 as the hash function.

Declaration

public static bool IsOnRightMachine(LicenseKey licenseKey, string machineCode, bool isFloatingLicense = false, bool allowOverdraft = false)

Parameters

Type	Name	Description
LicenseKey	licenseKey	The license key object.
string	machineCode	A unique identifier of the machine.
bool	isFloatingLicense	If this is a floating license, this parameter has to be set to true. You can enable floating licenses by setting FloatingTimeInterval to a value greater than 0.
bool	allowOverdraft	If floating licensing is enabled with overdraft, this parameter should be set to true. You can enable overdraft by setting MaxOverdraft to a value greater than 0.

Returns

Type	Description
bool

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IsOnRightMachinePI(LicenseKey, bool, bool, int)

Checks if the current license key is on the correct device with SHA-256 as the hash function.

Declaration

public static bool IsOnRightMachinePI(LicenseKey licenseKey, bool isFloatingLicense = false, bool allowOverdraft = false, int v = 1)

Parameters

Type	Name	Description
LicenseKey	licenseKey	The license key object.
bool	isFloatingLicense	If this is a floating license, this parameter has to be set to true. You can enable floating licenses by setting FloatingTimeInterval to a value greater than 0.
bool	allowOverdraft	If floating licensing is enabled with overdraft, this parameter should be set to true. You can enable overdraft by setting MaxOverdraft to a value greater than 0.
int	v	If version is set to 2, you can get the machine code as in the Python client, assuming similar settings are used. You can read more about it here: https://help.cryptolens.io/faq/index#machine-code-generation

Returns

Type	Description
bool

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IsSuccessful(BasicResult)

Checks if the result obtained from an API call is successful.

Declaration

public static bool IsSuccessful(BasicResult result)

Parameters

Type	Name	Description
BasicResult	result

Returns

Type	Description
bool

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IsVM()

This method can help to detect if the application is running inside a virtual machine. It has been tested in Microsoft Hyper-V. Support for other VM applications is coming soon.

Declaration

public static bool IsVM()

Returns

Type	Description
bool

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VerifyPassword(LicenseKey, string, string)

This method verifies the username and password with the information in the LicenseKey object. It provides a way to activate a license on a per user rather than per machine basis. To compute the password, the ComputePasswordHash(string) is used. A tutorial on how everything can be set up is available here: https://help.cryptolens.io/licensing-models/user-based-activations

Declaration

public static bool VerifyPassword(LicenseKey license, string username, string password)

Parameters

Type	Name	Description
LicenseKey	license
string	username
string	password

Returns

Type	Description
bool

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VerifySDKLicenseCertificate(string)

Verifies that the certificate of the software using the SDK is valid. This method will use GetAssemblyHash() to compute the hash of the assembly. The entry assembly will be verified, in other words, the assembly that initiated the call first.

Declaration

public static LicenseKey VerifySDKLicenseCertificate(string RSAPubKey)

Parameters

Type	Name	Description
string	RSAPubKey	Your RSA Public Key, which can be found here: https://app.cryptolens.io/docs/api/v3/QuickStart

Returns

Type	Description
LicenseKey	License Key object if the certificate is valid and null otherwise.

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VerifySDKLicenseCertificate(string, string, string)

Declaration

public static LicenseKey VerifySDKLicenseCertificate(string RSAPubKey, string certificate, string path)

Parameters

Type	Name	Description
string	RSAPubKey	Your RSA Public Key, which can be found here: https://app.cryptolens.io/docs/api/v3/QuickStart
string	certificate	The name of the certificate. Do not add .skm extension, it will be added automatically.
string	path	The path to the certificate and the assembly, whose hash is signed. Note, they need to be in the same folder.

Returns

Type	Description
LicenseKey	License Key object if the certificate is valid and null otherwise.