Java--Simple RSA algorithm encryption and decryption

Encryption protocol

public class Rsa_asc {
/** specifies that the encryption algorithm is Desede */
private static String algorithm = "RSA";
/** Specify the size of key */
private static int KEYSIZE = 1024;
/** Specify the public key to store the file */
private static String Public_key_file = "qhtec2017123";
/** Specify the private key to store the file */
private static String Private_key_file = "qhtec2017_java_08";

/**
* Generate key Pair
*/
private static void Generatekeypair () throws Exception {
The/** RSA algorithm requires a trustworthy random number source */
securerandom sr = new SecureRandom ();
/** creating a Keypairgenerator object for the RSA algorithm */
Keypairgenerator KPG = keypairgenerator.getinstance (algorithm);
/** initializes the Keypairgenerator object using the above random data source */
Kpg.initialize (KEYSIZE, SR);
/** Generate key Pair */
KeyPair KP = Kpg.generatekeypair ();
/** get the Public key */
Key PublicKey = Kp.getpublic ();
/** get the private key */
Key Privatekey = Kp.getprivate ();
/** writes the generated key to the file using the object stream */
ObjectOutputStream oos1 = new ObjectOutputStream (New FileOutputStream (
Public_key_file));
ObjectOutputStream Oos2 = new ObjectOutputStream (New FileOutputStream (
Private_key_file));
Oos1.writeobject (PublicKey);
Oos2.writeobject (Privatekey);
/** empty the cache, close the file output stream */
Oos1.close ();
Oos2.close ();
}

/**
* Encryption method Source: source data
*/
public static string Encrypt (string source) throws Exception {
Generatekeypair ();
/** read out the public key object in the file */
ObjectInputStream ois = new ObjectInputStream (New FileInputStream (
Public_key_file));
Key key = (key) ois.readobject ();
Ois.close ();
/** gets the cipher object to implement RSA encryption of the source data */
Cipher Cipher = cipher.getinstance (algorithm);
Cipher.init (Cipher.encrypt_mode, key);
Byte[] B = source.getbytes ();
/** Performing Cryptographic operations */
Byte[] B1 = cipher.dofinal (b);
Base64encoder encoder = new Base64encoder ();
Return Encoder.encode (B1);
}


Currently in use
public static void Main (string[] args) throws Exception {
String Source = "test#_#1511842260";//String to encrypt
String cryptograph = Encrypt (source);//Ciphertext generated
System.out.println (cryptograph);

}
}

Decryption protocol

public class Rsa_desc {
/** specifies that the encryption algorithm is Desede */
private static String algorithm = "RSA";
/** Specify the private key to store the file (encrypted generated key file storage path) */
private static String Private_key_file = System.getproperty ("web.root") + "/download/qhtec2017_java_08";




/**
* Decryption algorithm cryptograph: Ciphertext
*/
public static string decrypt (string cryptograph) {
try {
/** read out the private key object in the file */
ObjectInputStream ois = new ObjectInputStream (New FileInputStream (
Private_key_file));
Key key = (key) ois.readobject ();
/** gets the cipher object to decrypt the data encrypted with the public key by RSA */
Cipher Cipher = cipher.getinstance (algorithm);
Cipher.init (Cipher.decrypt_mode, key);
Base64decoder decoder = new Base64decoder ();
Byte[] B1 = Decoder.decodebuffer (cryptograph);
/** Perform decryption operation */
Byte[] B = cipher.dofinal (B1);
return new String (b);
} catch (Exception e) {
return "123";
}

}

public static void Main (string[] args) throws Exception {

String target = Decrypt ("orl1nilkf/tr0z+5k/ Fqk7vovtwlwtyxlc2cmcx9tpfbzbegh2u9h0txwkgzzvteibjxfs7rkojlizwewnw3z4bnegq12sbcrd+ R6v097uieoml3lc1chxy8s5hhrdy05ae8j9gl4qncvsgrxwcalxi4i1nydnu82eztzstpiyy= ");//Decrypt the text
SYSTEM.OUT.PRINTLN (target);
}
}

Java--Simple RSA algorithm encryption and decryption