Create CipherDecrypt.java

Author: SAKET-SK

CipherDecrypt.java

@@ -0,0 +1,45 @@
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.Signature;
+
+import javax.crypto.Cipher;
+
+public class CipherDecrypt {
+   public static void main(String args[]) throws Exception{
+	   //Creating a Signature object
+      Signature sign = Signature.getInstance("SHA256withRSA");
+      
+      //Creating KeyPair generator object
+      KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
+      
+      //Initializing the key pair generator
+      keyPairGen.initialize(2048);
+      
+      //Generate the pair of keys
+      KeyPair pair = keyPairGen.generateKeyPair();   
+      
+      //Getting the public key from the key pair
+      PublicKey publicKey = pair.getPublic();  
+
+      //Creating a Cipher object
+      Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
+
+      //Initializing a Cipher object
+      cipher.init(Cipher.ENCRYPT_MODE, publicKey);
+	  
+      //Add data to the cipher
+      byte[] input = "Welcome to Tutorialspoint".getBytes();	  
+      cipher.update(input);
+	  
+      //encrypting the data
+      byte[] cipherText = cipher.doFinal();	 
+      System.out.println( new String(cipherText, "UTF8"));
+
+      //Initializing the same cipher for decryption
+      cipher.init(Cipher.DECRYPT_MODE, pair.getPrivate());
+      
+      //Decrypting the text
+      byte[] decipheredText = cipher.doFinal(cipherText);
+      System.out.println(new String(decipheredText));
+   }
+}