Android AES Encrypt encryptHex(String content, String username, String password)

Description

encrypt Hex

Declaration

public static String encryptHex(String content, String username,
            String password) 

Method Source Code

//package com.java2s;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main {
    private static final String UTF_8 = "UTF-8";
    private static final char[] HEXCHARS = "0123456789abcdef".toCharArray();
    private static final byte[] defaultIV = { 127, 24, 123, 23, 93, 7, 15,
            0, 9, 4, 8, 15, 16, 23, 42, 1 };

    public static String encryptHex(String content, String key) {
        try {/*  ww  w .  j  a  v  a2s .  c  o  m*/
            byte[] res = encrypt(content.getBytes(UTF_8), key);
            return hexEncode(res);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String encryptHex(String content, String username,
            String password) {
        return encryptHex(content, password + username);
    }

    public static byte[] encrypt(byte[] content, String key) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec ivs = new IvParameterSpec(defaultIV);
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key), ivs);

            return cipher.doFinal(content);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String hexEncode(byte[] data) {
        StringBuffer r = new StringBuffer();
        for (int i = 0; i < data.length; i++) {
            byte v = data[i];
            r.append(HEXCHARS[(v >> 4) & 0xf]).append(HEXCHARS[v & 0xf]);
        }
        return r.toString();
    }

    private static SecretKeySpec getSecretKey(String key) {
        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("md5");
            SecretKeySpec keySpec = new SecretKeySpec(digest.digest(key
                    .getBytes(UTF_8)), "AES");
            return keySpec;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}

Related

1. encryptBase64(String content, String key)
2. encryptBase64(byte[] source)
3. encryptBytes(String seed, byte[] cleartext)
4. encryptBytes(byte[] data, byte[] key)
5. encryptHex(String content, String key)
6. encryptNumberWithAES(String number)
7. encryptToBase64Text(String key, String src)
8. encryptToBytes(String key, String src)
9. encryptUrlEncode(String dataPassword, String cleartext)