1 package xin.dreaming.aes;
  2 
  3 
  4 import javax.crypto.Cipher;
  5 import javax.crypto.SecretKey;
  6 import javax.crypto.spec.IvParameterSpec;
  7 import javax.crypto.spec.SecretKeySpec;
  8 
  9 import org.apache.commons.codec.binary.Base64;
 10 import org.junit.Test;
 11 public class AESUtils {
 12 
 13     /**
 14      * 生成随机密钥
 15      * 
 16      * @param size
 17      *            位数
 18      * @return
 19      */
 20     public static String generateRandomKey(int size) {
 21         StringBuilder key = new StringBuilder();
 22         String chars = "0123456789ABCDEF";
 23         for (int i = 0; i < size; i++) {
 24             int index = (int) (Math.random() * (chars.length() - 1));
 25             key.append(chars.charAt(index));
 26         }
 27         return key.toString();
 28     }
 29     
 30     /**
 31      * AES加密
 32      * 
 33      * @param plainBytes
 34      *            明文字节数组
 35      * @param keyBytes
 36      *            对称密钥字节数组
 37      * @param useBase64Code
 38      *            是否使用Base64编码
 39      * @param charset
 40      *            编码格式
 41      * @return byte[]
 42      */
 43     public static byte[] encryptAES(byte[] plainBytes, byte[] keyBytes, boolean useBase64Code, String charset) throws Exception {
 44         String cipherAlgorithm = "AES/CBC/PKCS5Padding";
 45         String keyAlgorithm = "AES";
 46         String IV = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
 47 
 48         try {
 49             Cipher cipher = Cipher.getInstance(cipherAlgorithm);
 50             SecretKey secretKey = new SecretKeySpec(keyBytes, keyAlgorithm);
 51             IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());
 52 
 53             cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);
 54 
 55             byte[] encryptedBlock = cipher.doFinal(plainBytes);
 56 
 57             if (useBase64Code) {
 58                 return Base64.encodeBase64String(encryptedBlock).getBytes(charset);
 59             } else {
 60                 return encryptedBlock;
 61             }
 62         } catch (Exception e) {
 63             e.printStackTrace();
 64             throw new Exception("AES加密失败");
 65         }
 66     }
 67 
 68     /**
 69      * AES解密
 70      * 
 71      * @param cryptedBytes
 72      *            密文字节数组
 73      * @param keyBytes
 74      *            对称密钥字节数组
 75      * @param useBase64Code
 76      *            是否使用Base64编码
 77      * @param charset
 78      *            编码格式
 79      * @return byte[]
 80      */
 81     public static byte[] decryptAES(byte[] cryptedBytes, byte[] keyBytes, boolean useBase64Code, String charset) throws Exception {
 82         String cipherAlgorithm = "AES/CBC/PKCS5Padding";
 83         String keyAlgorithm = "AES";
 84         String IV = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
 85 
 86         byte[] data = null;
 87 
 88         // 如果是Base64编码的话，则要Base64解码
 89         if (useBase64Code) {
 90             data = Base64.decodeBase64(new String(cryptedBytes, charset));
 91         } else {
 92             data = cryptedBytes;
 93         }
 94 
 95         try {
 96             Cipher cipher = Cipher.getInstance(cipherAlgorithm);
 97             SecretKey secretKey = new SecretKeySpec(keyBytes, keyAlgorithm);
 98             IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());
 99 
100             cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec);
101 
102             byte[] decryptedBlock = cipher.doFinal(data);
103 
104             return decryptedBlock;
105         } catch (Exception e) {
106             e.printStackTrace();
107             throw new Exception("AES解密失败");
108         }
109     }
110     
111     /**
112      * BASE64加密
113      * 
114      * @param key
115      * @return
116      * @throws Exception
117      */
118 
119     
120     @Test
121     public void aesTest() throws Exception{
122         String value ="DREAMING.XIN";
123         //生成随机AES对称密钥
124         String keyStr = generateRandomKey(16);
125         byte[] keyBytes = keyStr.getBytes("UTF-8");
126         
127         byte[] encryptAES = encryptAES(value.getBytes(), keyBytes, true, "UTF-8");
128         
129         System.out.println("AES加密后数据： "+new String(encryptAES));
130         
131         /*String encodeBase64String = Base64.encodeBase64String(encryptAES);
132         
133         System.out.println("先AES后BASE64： "+encodeBase64String);
134         
135         byte[] decodeBase64 = Base64.decodeBase64(encodeBase64String);*/
136         
137         byte[] decryptAES = decryptAES(encryptAES, keyBytes, true, "UTF-8");
138         
139         System.out.println("AES减密后数据： "+ new String(decryptAES));
140         
141     }
142     
143 }