public class AESUtil {
private static String key= "123456";
/**
* 加密
* @param content待加密内容
* @param key 加密的密钥
* @return
*/
public static String encrypt(String content, String key) {
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");//构造密钥生成器，指定为AES算法，不区分大小写
kgen.init(128, new SecureRandom(key.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");
byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);//ENCRYPT_MODE指加密操作
byte[] byteRresult = cipher.doFinal(byteContent);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < byteRresult.length; i++) {
String hex = Integer.toHexString(byteRresult[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* 解密
* @param content 待解密内容
* @param key 解密的密钥
* @return
*/
public static String decrypt(String content, String key) {
if (content.length() < 1)
return null;
byte[] byteRresult = new byte[content.length() / 2];
for (int i = 0; i < content.length() / 2; i++) {
int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2),16);
byteRresult[i] = (byte) (high * 16 + low);
}
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(key.getBytes());
kgen.init(128, secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);//Decrypt_mode指解密操作
byte[] result = cipher.doFinal(byteRresult);
return new String(result,"utf-8");//不加utf-8，中文时会乱码
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
//重载的方法，使用默认密钥
public static String decrypt(String content) {
return decrypt(content, key);
}
public static String encrypt(String content) {
return encrypt(content, key);
}
