AES 加密工具类

/**
 * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
 */
public class AESOperator {
 
    /*
     * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。0021XdSh0021XdSh
     */
    private String sKey = "10d2Xd4hf0s1XvSw";
    private String ivParameter = "10d2Xd4hf0s1XvSw";
    private static AESOperator instance = null;
 
    private AESOperator() {
 
    }
 
    public static AESOperator getInstance() {
        if (instance == null)
            instance = new AESOperator();
        return instance;
    }
 
    public static String Encrypt(String encData, String secretKey, String vector) throws Exception {
 
        if (secretKey == null) {
            return null;
        }
        if (secretKey.length() != 16) {
            return null;
        }
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = secretKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
 
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);// �˴�ʹ��BASE64��ת�롣
    }
 
    // ����
    public String encrypt(String sSrc) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// ʹ��CBCģʽ����Ҫһ������iv�������Ӽ����㷨��ǿ��
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);// �˴�ʹ��BASE64��ת�롣
    }
 
    // ����
    public String decrypt(String sSrc) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// ����base64����
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }
 
    public String decrypt(String sSrc, String key, String ivs) throws Exception {
        try {
            byte[] raw = key.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// ����base64����
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }
 
    public static String encodeBytes(byte[] bytes) {
        StringBuffer strBuf = new StringBuffer();
 
        for (int i = 0; i < bytes.length; i++) {
            strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
            strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
        }
 
        return strBuf.toString();
    }
 
}