srQ1Q089

1public static void main(String[] args) throws Exception {
2    String username = "bob@google.org";
3    String password = "Password1";
4    String secretID = "BlahBlahBlah";
5    String SALT2 = "deliciously salty";
6
7    // Get the Key
8    byte[] key = (SALT2 + username + password).getBytes();
9    System.out.println((SALT2 + username + password).getBytes().length);
10
11    // Need to pad key for AES
12    // TODO: Best way?
13
14    // Generate the secret key specs.
15    SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
16
17    // Instantiate the cipher
18    Cipher cipher = Cipher.getInstance("AES");
19    cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
20
21    byte[] encrypted = cipher.doFinal((secrectID).getBytes());
22    System.out.println("encrypted string: " + asHex(encrypted));
23
24    cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
25    byte[] original = cipher.doFinal(encrypted);
26    String originalString = new String(original);
27    System.out.println("Original string: " + originalString + "nOriginal string (Hex): " + asHex(original));
28}
29	
30byte[] key = (SALT2 + username + password).getBytes("UTF-8");
31MessageDigest sha = MessageDigest.getInstance("SHA-1");
32key = sha.digest(key);
33key = Arrays.copyOf(key, 16); // use only first 128 bit
34
35SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
36	
37PBEKeySpec pbeKeySpec;
38        PBEParameterSpec pbeParamSpec;
39        SecretKeyFactory keyFac;
40
41        // Salt
42        byte[] salt = {
43            (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
44            (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
45        };
46
47        // Iteration count
48        int count = 20;
49
50        // Create PBE parameter set
51        pbeParamSpec = new PBEParameterSpec(salt, count);
52
53        // Prompt user for encryption password.
54        // Collect user password as char array (using the
55        // "readPassword" method from above), and convert
56        // it into a SecretKey object, using a PBE key
57        // factory.
58        System.out.print("Enter encryption password:  ");
59        System.out.flush();
60        pbeKeySpec = new PBEKeySpec(readPassword(System.in));
61        keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
62        SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
63
64        // Create PBE Cipher
65        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
66
67        // Initialize PBE Cipher with key and parameters
68        pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);
69
70        // Our cleartext
71        byte[] cleartext = "This is another example".getBytes();
72
73        // Encrypt the cleartext
74        byte[] ciphertext = pbeCipher.doFinal(cleartext);
75	
76import java.security.Key;
77import javax.crypto.Cipher;
78import javax.crypto.spec.SecretKeySpec;
79import sun.misc.*;
80import java.io.BufferedReader;
81import java.io.FileReader;
82
83public class AESFile 
84{
85private static String algorithm = "AES";
86private static byte[] keyValue=new byte[] {'0','2','3','4','5','6','7','8','9','1','2','3','4','5','6','7'};// your key
87
88    // Performs Encryption
89    public static String encrypt(String plainText) throws Exception 
90    {
91            Key key = generateKey();
92            Cipher chiper = Cipher.getInstance(algorithm);
93            chiper.init(Cipher.ENCRYPT_MODE, key);
94            byte[] encVal = chiper.doFinal(plainText.getBytes());
95            String encryptedValue = new BASE64Encoder().encode(encVal);
96            return encryptedValue;
97    }
98
99    // Performs decryption
100    public static String decrypt(String encryptedText) throws Exception 
101    {
102            // generate key 
103            Key key = generateKey();
104            Cipher chiper = Cipher.getInstance(algorithm);
105            chiper.init(Cipher.DECRYPT_MODE, key);
106            byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedText);
107            byte[] decValue = chiper.doFinal(decordedValue);
108            String decryptedValue = new String(decValue);
109            return decryptedValue;
110    }
111
112//generateKey() is used to generate a secret key for AES algorithm
113    private static Key generateKey() throws Exception 
114    {
115            Key key = new SecretKeySpec(keyValue, algorithm);
116            return key;
117    }
118
119    // performs encryption & decryption 
120    public static void main(String[] args) throws Exception 
121    {
122        FileReader file = new FileReader("C://myprograms//plaintext.txt");
123        BufferedReader reader = new BufferedReader(file);
124        String text = "";
125        String line = reader.readLine();
126    while(line!= null)
127        {
128            text += line;
129    line = reader.readLine();
130        }
131        reader.close();
132    System.out.println(text);
133
134            String plainText = text;
135            String encryptedText = AESFile.encrypt(plainText);
136            String decryptedText = AESFile.decrypt(encryptedText);
137
138            System.out.println("Plain Text : " + plainText);
139            System.out.println("Encrypted Text : " + encryptedText);
140            System.out.println("Decrypted Text : " + decryptedText);
141    }
142}