Asymmetric encryption, decryption, validation helper class Rsasecurityhelper

<summary>

Private key and public key generated by asymmetric encryption

</summary>

<param name= "Privatekey" > Private key </param>

<param name= "PublicKey" > Public key </param>

public static void Generatersakey (out string privatekey, out string publickey)

#region Asymmetric Data encryption (public key cryptography)

<summary>

Asymmetric encryption of string data, returning encrypted data

</summary>

<param name= "PublicKey" > Public key </param>

<param name= "originalstring" > Strings to be encrypted </param>

<returns> Data after encryption </returns>

public static string Rsaencrypt (String publickey, String originalstring)

<summary>

An asymmetric encrypted byte array that returns the encrypted data

</summary>

<param name= "PublicKey" > Public key </param>

<param name= "originalbytes" > byte array to encrypt </param>

<returns> returns the encrypted data </returns>

public static string Rsaencrypt (String publickey, byte[] originalbytes)

#endregion

#region Asymmetric decryption (private key decryption)

<summary>

Asymmetric decrypted string that returns the decrypted data

</summary>

<param name= "Privatekey" > Private key </param>

<param name= "encryptedstring" > Data to Decrypt </param>

<returns> returns the decrypted data </returns>

public static string Rsadecrypt (String Privatekey, String encryptedstring)

<summary>

An asymmetric decrypted byte array that returns the decrypted data

</summary>

<param name= "Privatekey" > Private key </param>

<param name= "Encryptedbytes" > Data to Decrypt </param>

<returns></returns>

public static string Rsadecrypt (String Privatekey, byte[] encryptedbytes)

#endregion

#region Asymmetric cryptographic signature, authentication

<summary>

Signing data with asymmetric encryption

</summary>

<param name= "Privatekey" > Private key </param>

<param name= "originalstring" > Strings to be encrypted </param>

<returns> Data after encryption </returns>

public static string Rsaencrypsignature (String Privatekey, String originalstring)

<summary>

A string that encrypts the signature on the private key and validates it with the public key

</summary>

<param name= "originalstring" > unencrypted text, such as machine code </param>

<param name= "encrytedstring" > encrypted text, such as registering serial number </param>

<returns> If validation returns True, otherwise false</returns>

public static bool Validate (string originalstring, String encrytedstring)

<summary>

A string that is encrypted with the private key, which is validated with the public key

</summary>

<param name= "originalstring" > unencrypted text, such as machine code </param>

<param name= "encrytedstring" > encrypted text, such as registering serial number </param>

<param name= "PublicKey" > Asymmetric Encryption Public key </param>

<returns> If validation returns True, otherwise false</returns>

public static bool Validate (string originalstring, String encrytedstring, String publickey)

2

Generate encryption and decryption private key, public key

String publickey = "";

String privatekey = "";

Rsasecurityhelper.generatersakey (out Privatekey, out publickey);

String originalstring = "TestData";

String encryptedstring = Rsasecurityhelper.rsaencrypt (PublicKey, originalstring);

String originalString2 = Rsasecurityhelper.rsadecrypt (Privatekey, encryptedstring);

if (originalstring = = originalString2)

{

Messageutil.showtips ("Decryption is completely correct");

}

Else

{

Messageutil.showwarning ("Decryption failed");

}

String regcode = Rsasecurityhelper.rsaencrypsignature (Privatekey, originalstring);

BOOL validated = Rsasecurityhelper.validate (originalstring, Regcode, PublicKey);
Messageutil.showtips (validated? "Validation succeeded": "Validation Failed");

3

<summary>

Check that the user is registered every time the program runs

</summary>

<returns> returns True if the user is already registered, otherwise false</returns>

public bool Checkregister ()

{

First get the user's registration code for comparison

String serialnumber = String. Empty; Registration code

RegistryKey reg = Registry.CurrentUser.OpenSubKey (Uiconstants.softwareregistrykey, true);

if (null! = reg)

{

SerialNumber = (string) Reg. GetValue ("SerialNumber");

Portal.gc.bRegisted = Portal.gc.Register (serialnumber);

}

return Portal.gc.bRegisted;

}

<summary>

Call the asymmetric encryption method to verify the serial number

</summary>

<param name= "SerialNumber" > correct serial number </param>

<returns> false</returns> If successful returns true

public bool Register (String serialnumber)

{

String hardnumber = Hardwareinfohelper.getcpuid ();

Return Rsasecurityhelper.validate (Hardnumber, serialnumber);

}

public string Gethardnumber ()

{

return Hardwareinfohelper.getcpuid ();
}

Asymmetric encryption, decryption, validation helper class Rsasecurityhelper