NXNkCj61

1import javax.crypto.Mac;
2import javax.crypto.spec.SecretKeySpec;
3import javax.xml.bind.DatatypeConverter;
4
5import java.security.InvalidKeyException;
6import java.security.NoSuchAlgorithmException;
7import org.apache.commons.codec.binary.Hex;
8
9import java.io.File;
10import java.io.FileInputStream;
11import java.io.UnsupportedEncodingException;
12import java.math.BigInteger;
13import java.nio.charset.StandardCharsets;
14
15
16public class ABCHash{
17        public static void main(String[] args) throws Exception        
18        {
19                try{
20                        int character;
21                        StringBuffer buffer = new StringBuffer("");
22                        FileInputStream inputStream = new FileInputStream(new File("C:/EncPDF.txt"));
23
24                        while( (character = inputStream.read()) != -1)
25                                buffer.append((char) character);
26
27                        inputStream.close();
28                        System.out.println("Fetching data from the file"+buffer);
29
30                        StringBuffer sbuf = new StringBuffer(buffer);
31
32                        String str=sbuf.toString();
33
34                        System.out.println( "Data = "+ str);
35                        if(str!=null)
36                        {
37                                String key = "0123456789ABCDEF0123456789ABCDEF"; // Assuming the key as 0123456789ABCDEF
38
39                                byte[] hexvalue= stringToHexByte(str);
40                                byte[] hexkey=stringToHexByte(key);
41                                byte[] byHMAC = encode(hexkey, hexvalue);
42                                String stEncryptedData = Hex.encodeHexString(byHMAC).toUpperCase();
43
44                                System.out.println("Encrypted data =n "+stEncryptedData);
45                        }
46                }
47                catch(Exception e)
48                {
49                        System.out.println("Exception in the file reading"+e);
50                }
51
52        }
53
54        private static byte[] encode(byte[] hexkey, byte[] hexvalue) {
55                try {
56                        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
57                        SecretKeySpec secret_key = new SecretKeySpec(hexkey, "HmacSHA256");
58                        sha256_HMAC.init(secret_key);
59
60                        return sha256_HMAC.doFinal(hexvalue);
61
62                } catch (NoSuchAlgorithmException e) {
63                        e.printStackTrace();
64                } catch (InvalidKeyException e) {
65                        e.printStackTrace();
66                }
67
68                return null;
69        }
70
71        public static String stringToHex(String base) throws UnsupportedEncodingException
72        {
73                return String.format("%040x", new BigInteger(1, base.getBytes(StandardCharsets.US_ASCII)));
74        }
75
76        public static byte[] stringToHexByte(String base) throws UnsupportedEncodingException
77        {
78                System.out.println(stringToHex(base).toUpperCase());
79                return DatatypeConverter.parseHexBinary(stringToHex(base).toUpperCase());
80        }
81
82}