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1
2import java.io.UnsupportedEncodingException;
3import java.security.MessageDigest;
4import java.security.NoSuchAlgorithmException;
5import java.security.SecureRandom;
6import java.security.spec.AlgorithmParameterSpec;
7import java.security.spec.InvalidKeySpecException;
8import java.security.spec.KeySpec;
9import java.util.Arrays;
10
11import javax.crypto.Cipher;
12import javax.crypto.SecretKey;
13import javax.crypto.SecretKeyFactory;
14import javax.crypto.spec.IvParameterSpec;
15import javax.crypto.spec.PBEKeySpec;
16import javax.crypto.spec.SecretKeySpec;
17import javax.print.DocFlavor.STRING;
18
19import org.apache.commons.codec.binary.Base64;
20
21
22
23public class AES
24{
25
26	
27    private static SecretKeySpec secretKey ;
28    private static byte[] key ;
29    
30	private static String decryptedString;
31	private static String encryptedString;
32 
33    
34    public static void setKey(String myKey){
35    	
36   
37    	MessageDigest sha = null;
38		try {
39			key = myKey.getBytes("UTF-8");
40			System.out.println(key.length);
41			sha = MessageDigest.getInstance("SHA-1");
42			key = sha.digest(key);
43	    	key = Arrays.copyOf(key, 16); // use only first 128 bit
44	    	System.out.println(key.length);
45	    	System.out.println(new String(key,"UTF-8"));
46		    secretKey = new SecretKeySpec(key, "AES");
47		    
48		    
49		} catch (NoSuchAlgorithmException e) {
50			// TODO Auto-generated catch block
51			e.printStackTrace();
52		} catch (UnsupportedEncodingException e) {
53			// TODO Auto-generated catch block
54			e.printStackTrace();
55		}
56    	
57	    	  
58	
59
60    }
61    
62    public static String getDecryptedString() {
63		return decryptedString;
64	}
65
66	public static void setDecryptedString(String decryptedString) {
67		AES.decryptedString = decryptedString;
68	}
69
70    public static String getEncryptedString() {
71		return encryptedString;
72	}
73
74	public static void setEncryptedString(String encryptedString) {
75		AES.encryptedString = encryptedString;
76	}
77
78	public static String encrypt(String strToEncrypt)
79    {
80        try
81        {
82            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
83        
84            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
85        
86         
87            setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
88        
89        }
90        catch (Exception e)
91        {
92           
93            System.out.println("Error while encrypting: "+e.toString());
94        }
95        return null;
96
97    }
98
99    public static String decrypt(String strToDecrypt)
100    {
101        try
102        {
103            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
104           
105            cipher.init(Cipher.DECRYPT_MODE, secretKey);
106            setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));
107            
108        }
109        catch (Exception e)
110        {
111         
112            System.out.println("Error while decrypting: "+e.toString());
113
114        }
115        return null;
116    }
117
118
119    public static void main(String args[])
120    {
121 
122                final String strToEncrypt = "My text to encrypt";
123                final String strPssword = "encryptor key";
124                AES.setKey(strPssword);
125               
126                AES.encrypt(strToEncrypt.trim());
127                
128                System.out.println("String to Encrypt: " + strToEncrypt); 
129                System.out.println("Encrypted: " + AES.getEncryptedString());
130           
131                final String strToDecrypt =  AES.getEncryptedString();
132                AES.decrypt(strToDecrypt.trim());
133               
134                System.out.println("String To Decrypt : " + strToDecrypt);
135                System.out.println("Decrypted : " + AES.getDecryptedString());
136        
137    }
138     
139}