java 接口加密工具类

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class EncryptAndDecryptUtil {
	public static String keyValue = ""; // 用户密钥
	public static String token = "";//口令
	
	/***************** AES文本加密、解密 ********************/
	/**
	 * 文本加密
	 * 
	 * @param content
	 *            需要加密的文本
	 * @param keyValue
	 *            密钥
	 * @return 加密后文本
	 */
	public static String encrypt(String content) {
		String str = "";
		try {
			SecretKey secretKey = getKey(keyValue);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return parseByte2HexStr(result);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;
	}

	/**
	 * 解密
	 * 
	 * @param content
	 *            待解密内容
	 * @param password
	 *            解密密钥
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public static String decrypt(String content) {
		try {
			SecretKey secretKey = getKey(keyValue);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(parseHexStr2Byte(content));
			String strRes = null;
			try {
				strRes = new String(result, "utf-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
			return strRes;
		} 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();
		}
		return null;
	}

	/**
	 * 将二进制转换成16进制
	 * 
	 * @param buf
	 * @return
	 */
	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();
	}

	/**
	 * 将16进制转换为二进制
	 * 
	 * @param hexStr
	 * @return
	 */
	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 static SecretKey getKey(String strKey) {
		try {
			KeyGenerator _generator = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(strKey.getBytes());
			_generator.init(128, secureRandom);
			return _generator.generateKey();
		} catch (Exception e) {
			throw new RuntimeException(" 初始化密钥出现异常 ");
		}
	}
	
	/***************** MD5生成摘要; SHA-1生成签名 ********************/
	
	/**
	 * 使用指定算法加密（默认MD5，生成摘要）
	 * 
	 */
	public static String digest(String strSrc, String encName) {
		MessageDigest md = null;
		String strDes = null;
		byte[] bt = strSrc.getBytes();
		try {
			if (encName == null || encName.equals("")) {
				encName = "MD5";
			}
			md = MessageDigest.getInstance(encName);
			md.update(bt);
			strDes = EncryptAndDecryptUtil.parseByte2HexStr(md.digest()); // to HexString
		} catch (NoSuchAlgorithmException e) {
			return null;
		}
		return strDes;
	}

	/**
	 * 根据token、lol以及时间戳来生成签名
	 * 
	 * @param token
	 * @param lol
	 * @param millis
	 * @return
	 */
	public static String generateSignature(String token, String lol,
			long millis) {
		String timestamp = String.valueOf(millis);
		String signature = null;
		if (null!=token && !"".equals(token) && null!=timestamp && !"".equals(timestamp)) {
			List<String> srcList = new ArrayList<String>();
			srcList.add(timestamp);
			srcList.add(token);
			srcList.add(lol);
			Collections.sort(srcList);
			StringBuilder sb = new StringBuilder();
			for (int i = 0; i < srcList.size(); i++) {
				sb.append(srcList.get(i));
			}
			signature = digest(sb.toString(), "SHA-1");
			srcList.clear();
			srcList = null;
		}
		return signature;
	}

	/**
	 * 验证摘要(判断参数是否被修改过)
	 * @param digest
	 * @param requestParamStr
	 * @return
	 */
	public static boolean isValid(String digest,String requestParamStr){
		String lol = EncryptAndDecryptUtil.digest(requestParamStr, "MD5");
		return digest.equals(lol);
	}
	
	/**
	 * 验证签名:
	 * 1.根据token、lol以及时间戳计算一次签名;<br/>
	 * 2.比较传过来的签名以及计算出的签名是否一致;
	 * @param signature
	 * @param lol
	 * @param millis
	 * @return
	 */
	public static boolean isValid(String signature, String digest, long millis) {
		String calculatedSignature = generateSignature(token, digest,millis);
		if (calculatedSignature.equals(signature)) {
			return true;
		} else {
			return false;
		}
	}
	
}