AES算法的java实现

前言

AES（Advanced Encryption Standard）是一种对称加密算法，被广泛应用于保护数据的安全性。AES算法对称密钥长度可以是128位、192位或256位，这使得它足够强大，能够抵御目前和可预见的未来攻击。

AES算法通过替换、置换和混淆的步骤，对数据进行加密，其加密和解密使用相同的密钥。由于其高效性和安全性，AES算法在诸如网络通信、数据库加密、文件加密等领域被广泛使用。同时，许多操作系统和编程语言都提供了对AES算法的原生支持，使得开发人员可以轻松地将其集成到自己的应用程序中。

代码

AES算法以其速度快、安全可靠的特性成为当今最常用的对称加密算法之一，为保护数据安全提供了重要的工具。
是现代码如下：

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import net.sf.json.JSONObject;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


@SuppressWarnings("restriction")
public class AESOperatorKit {

	/*
	 * 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。
	 */
	private String sKey = "12345678";// key，可修改
	private String ivParameter = "abcdefg";// 偏移量,可修改
	private static AESOperatorKit instance = null;

	private AESOperatorKit() {

	}

	public static AESOperatorKit getInstance() {
		if (instance == null)
			instance = new AESOperatorKit();
		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());
		cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
		byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
		return new BASE64Encoder().encode(encrypted);
	}

	// 加密
	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());
		cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
		byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
		

		return parseByte2HexStr(encrypted);
	}

	
	public String encrypt(String sSrc, boolean uriSafe) 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());
		cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
		byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

		String resultStr = new BASE64Encoder().encode(encrypted);
		
		if (uriSafe) {
			
			resultStr = resultStr.replace("+", "-");
			resultStr = resultStr.replace("/", "_");
			resultStr = resultStr.replace("=", "@");
		}
		return resultStr;
	}

	public static String parseByte2HexStr(byte[] buf) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	public static byte[] parseHexStr2Byte(String hexStr) {
		if (hexStr.length() < 1)
			return null;
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++) {
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = ((byte) (high * 16 + low));
		}
		return result;
	}

	
	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 = parseHexStr2Byte(sSrc);
			byte[] original = cipher.doFinal(encrypted1);
			String originalString = new String(original, "utf-8");
			return originalString;
		} catch (Exception ex) {
			return null;
		}
	}

	
	public String decryptBase64(String sSrc, boolean uriSafe) 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);

			if (uriSafe) {
				
				sSrc = sSrc.replace("-", "+");
				sSrc = sSrc.replace("_", "/");
				sSrc = sSrc.replace("@", "=");
			}
			byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);
			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);
			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();
	}

	public static void main(String[] args) throws Exception {
		
		
		String params = AESOperatorKit.getInstance().encrypt("ABCDEFG", true);
		System.out.println(params);
		
		
		String srcStr = AESOperatorKit.getInstance().decryptBase64(params, true);
		System.out.println(srcStr);
	}

}