Detailed. NET encryption and decryption algorithm (3) Asymmetric encryption

This blog post lists the. NET under the commonly used asymmetric encryption algorithm, and they are made into small demo, hope to be helpful to everyone.

Rsa

static string Enrsa (String data,string publickey)  
{  
    RSACryptoServiceProvider RSA = new RSACryptoServiceProvider ();   
    Byte[] cipherbytes;   
    Rsa. Fromxmlstring (PublicKey);   
    Cipherbytes = RSA. Encrypt (Encoding.UTF8.GetBytes (data), false);   
    Return convert.tobase64string (cipherbytes);  
          
}  
      
static string Dersa (String data,string privatekey)  
{  
         
    RSACryptoServiceProvider RSA = new RSACryptoServiceProvider ();   
    Byte[] cipherbytes; Rsa. Fromxmlstring (Privatekey);   
    Cipherbytes = RSA. Decrypt (convert.frombase64string (data), false);   
    Return Encoding.UTF8.GetString (cipherbytes);  
}

Calling code

  Console.WriteLine ("RSA Asymmetric Encryption");  
Byte[] IV = CreateKey ();  
byte[] key = CreateKey ();  
String inputrsa_1 = InputString ();  
RSA RSA = RSA. Create ();  
      
String endata = Enrsa (Inputrsa_1,rsa. Toxmlstring (false));  
      
      
Console.WriteLine ("Encrypted data: {0}", endata);  
Console.WriteLine ("Decrypted data: {0}", Dersa (Endata,rsa). Toxmlstring (true));

DSA (digital signature)

static string Endsa (String data,string publickey)  
  {  
      DSA DSA = DSA. Create ();  
      Byte[] result;  
      Dsa. Fromxmlstring (PublicKey);  
      SHA1 SHA1 = SHA1. Create ();  
      result = DSA. CreateSignature (Sha1.computehash (convert.frombase64string (data));  
      return convert.tobase64string (result);  
     
            
  }  
     
  static bool Dedsa (string data,string privatekey,string originaldata)  
  {  
      //byte[] result;  
      DSA DSA = DSA. Create ();  
      Dsa. Fromxmlstring (Privatekey);  
      SHA1 SHA1 = SHA1. Create ();  
      Return DSA. VerifySignature (Sha1.computehash (convert.frombase64string (Originaldata)), convert.frombase64string (data);  
     
  }

Calling code

  Console.WriteLine ("DSA digital signature");  
String inputdsa_1 = InputString ();  
string inputdsa_2 = inputdsa_1;  
DSA DSA = DSA. Create ();  
String endata = ENDSA (inputdsa_1, DSA. Toxmlstring (True));  
      
Console.WriteLine ("Encrypted data: {0}", endata);  
Console.WriteLine ("Decrypted data: {0}", DEDSA (Endata, DSA). Toxmlstring (False), inputdsa_2));

ECDsa

static string Enecdsa (string data, Cngkey key)  
 {  
     ecdsacng ECDSA = new Ecdsacng (key);  
           
           
     SHA1 SHA1 = SHA1. Create ();  
     Byte[] result;  
      
     result = Ecdsa. Signhash (Sha1.computehash (convert.frombase64string (data));  
      
     return convert.tobase64string (result);  
      
 }  
      
 static bool Deecdsa (string data, Cngkey key,string originaldata)  
 {  
     ecdsacng ECDSA = new Ecdsacng (key);  
     SHA1 SHA1 = SHA1. Create ();  
      
     Return ECDSA. Verifyhash (Sha1.computehash (convert.frombase64string (Originaldata)), convert.frombase64string (data);  
 }

Calling code

  Console.WriteLine ("ECDSA digital signature");  
String inputdsa_1 = InputString ();  
string inputdsa_2 = inputdsa_1;  
Cngkey key = Cngkey.create (cngalgorithm.ecdsap256);  
      
String endata = ENECDSA (inputdsa_1, key);  
      
Console.WriteLine ("Encrypted data: {0}", endata);  
Console.WriteLine ("Decrypted data: {0}", DEECDSA (Endata, Key, inputdsa_2));