HXcHw8TE

1import java.io.UnsupportedEncodingException;
2import java.security.MessageDigest;
3import java.security.NoSuchAlgorithmException;
4import java.util.Arrays;
5import javax.crypto.Cipher;
6import javax.crypto.spec.SecretKeySpec;
7import org.apache.commons.codec.binary.Base64;
8/**
9Aes encryption
10*/
11public class AES
12{
13    
14    private static SecretKeySpec secretKey ;
15    private static byte[] key ;
16    
17    private static String decryptedString;
18    private static String encryptedString;
19    
20    public static void setKey(String myKey){
21        
22   
23        MessageDigest sha = null;
24        try {
25            key = myKey.getBytes("UTF-8");
26            System.out.println(key.length);
27            sha = MessageDigest.getInstance("SHA-1");
28            key = sha.digest(key);
29            key = Arrays.copyOf(key, 16); // use only first 128 bit
30            System.out.println(key.length);
31            System.out.println(new String(key,"UTF-8"));
32            secretKey = new SecretKeySpec(key, "AES");
33            
34            
35        } catch (NoSuchAlgorithmException e) {
36            // TODO Auto-generated catch block
37            e.printStackTrace();
38        } catch (UnsupportedEncodingException e) {
39            // TODO Auto-generated catch block
40            e.printStackTrace();
41        }
42        
43              
44    
45    }
46    
47    public static String getDecryptedString() {
48        return decryptedString;
49    }
50    public static void setDecryptedString(String decryptedString) {
51        AES.decryptedString = decryptedString;
52    }
53    public static String getEncryptedString() {
54        return encryptedString;
55    }
56    public static void setEncryptedString(String encryptedString) {
57        AES.encryptedString = encryptedString;
58    }
59    public static String encrypt(String strToEncrypt)
60    {
61        try
62        {
63            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
64        
65            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
66        
67         
68            setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
69        
70        }
71        catch (Exception e)
72        {
73           
74            System.out.println("Error while encrypting: "+e.toString());
75        }
76        return null;
77    }
78    public static String decrypt(String strToDecrypt)
79    {
80        try
81        {
82            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
83           
84            cipher.init(Cipher.DECRYPT_MODE, secretKey);
85            setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));
86            
87        }
88        catch (Exception e)
89        {
90         
91            System.out.println("Error while decrypting: "+e.toString());
92        }
93        return null;
94    }
95    public static void main(String args[])
96    {
97                final String strToEncrypt = "My text to encrypt";
98                final String strPssword = "encryptor key";
99                AES.setKey(strPssword);
100               
101                AES.encrypt(strToEncrypt.trim());
102                
103                System.out.println("String to Encrypt: " + strToEncrypt); 
104                System.out.println("Encrypted: " + AES.getEncryptedString());
105           
106                final String strToDecrypt =  AES.getEncryptedString();
107                AES.decrypt(strToDecrypt.trim());
108               
109                System.out.println("String To Decrypt : " + strToDecrypt);
110                System.out.println("Decrypted : " + AES.getDecryptedString());
111        
112    }
113     
114}