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51import java.util.*;
52import java.io.BufferedReader;
53import java.io.InputStreamReader;
54import java.security.spec.KeySpec;
55import javax.crypto.Cipher;
56import javax.crypto.SecretKey;
57import javax.crypto.SecretKeyFactory;
58import javax.crypto.spec.DESedeKeySpec;
59//import sun.misc.BASE64Decoder;
60//import sun.misc.BASE64Encoder;
61import java.util.Base64;
62public class DES {
63private static final String UNICODE_FORMAT = "UTF8";
64public static final String DESEDE_ENCRYPTION_SCHEME = "DESede";
65private KeySpec myKeySpec;
66private SecretKeyFactory mySecretKeyFactory;
67private Cipher cipher;
68byte[] keyAsBytes;
69private String myEncryptionKey;
70private String myEncryptionScheme;
71SecretKey key;
72static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
73public DES() throws Exception {
74// TODO code application logic here
75myEncryptionKey="ThisIsSecretEncryptionKey";
76myEncryptionScheme=DESEDE_ENCRYPTION_SCHEME;
77keyAsBytes=myEncryptionKey.getBytes(UNICODE_FORMAT);
78myKeySpec=new DESedeKeySpec(keyAsBytes);
79mySecretKeyFactory = SecretKeyFactory.getInstance(myEncryptionScheme);
80cipher = Cipher.getInstance(myEncryptionScheme);
81key = mySecretKeyFactory.generateSecret(myKeySpec);
82}
83public String encrypt(String unencryptedString)
84{ String encryptedString = null;
85try {
86cipher.init(Cipher.ENCRYPT_MODE, key);
87byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
88byte[] encryptedText = cipher.doFinal(plainText);
89encryptedString = Base64.getEncoder().encodeToString(encryptedText);
90}
91catch (Exception e)
92{
93e.printStackTrace();
94}
95return encryptedString;
96}
97DES.java 06-02-2019 10:29
98Page 1 of 2
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135public String decrypt(String encryptedString)
136{ String decryptedText=null;
137try {
138cipher.init(Cipher.DECRYPT_MODE, key);
139byte[] encryptedText = Base64.getDecoder().decode(encryptedString);
140byte[] plainText = cipher.doFinal(encryptedText);
141decryptedText=bytes2String(plainText); }
142catch (Exception e)
143{
144e.printStackTrace();
145}
146return decryptedText;
147}
148private static String bytes2String(byte[] bytes)
149{ StringBuffer stringBuffer = new StringBuffer();
150for (int i = 0; i <bytes.length;i++)
151{ stringBuffer.append((char) bytes[i]); }
152return stringBuffer.toString();
153}
154public static void main(String args []) throws Exception
155{
156DES myEncryptor= new DES();
157System.out.print("Enter the string: ");
158String stringToEncrypt = br.readLine();
159String encrypted = myEncryptor.encrypt(stringToEncrypt);
160String decrypted = myEncryptor.decrypt(encrypted);
161System.out.println("\nString To Encrypt: " +stringToEncrypt);
162System.out.println("\nEncrypted Value : " +encrypted);
163System.out.println("\nDecrypted Value : " +decrypted); System.out.println("");
164}
165}
166DES.java 06-02-2019 10:29
167Page 2 of 2