java 加密工具类（MD5、RSA、AES等加密方式）

比眉伴天荒 2022-08-20 05:27 214阅读 0赞

**1.加密工具类encryption**

**MD5加密**

import org.apache.commons.codec.digest.DigestUtils;
    
    /**
     * MD5加密组件
     * 
     * @author wbw
     * @version 1.0
     * @since 1.0
     */
    public abstract class MD5Util {
    
    	/**
    	 * MD5加密
    	 * 
    	 * @param data
    	 *            待加密数据
    	 * @return byte[] 消息摘要
    	 * 
    	 * @throws Exception
    	 */
    	public static byte[] encodeMD5(String data) throws Exception {
    
    		// 执行消息摘要
    		return DigestUtils.md5(data);
    	}
    
    	/**
    	 * MD5加密
    	 * 
    	 * @param data
    	 *            待加密数据
    	 * @return byte[] 消息摘要
    	 * 
    	 * @throws Exception
    	 */
    	public static String encodeMD5Hex(String data) {
    		// 执行消息摘要
    		return DigestUtils.md5Hex(data);
    	}
    }

AES加密:

import javax.crypto.Cipher;
 import javax.crypto.spec.SecretKeySpec;
 
 public class AESUtil {
 
 	private static final String KEY_AES = "AES";
 
 	public static String encrypt(String src, String key) throws Exception {
 		if (key == null || key.length() != 16) {
 			throw new Exception("key不满足条件");
 		} 
 		byte[] raw = key.getBytes();
 		SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
 		Cipher cipher = Cipher.getInstance(KEY_AES);
 		cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
 		byte[] encrypted = cipher.doFinal(src.getBytes());
 		return byte2hex(encrypted);
 	}
 
 	public static String decrypt(String src, String key) throws Exception {
 		if (key == null || key.length() != 16) {
 			throw new Exception("key不满足条件");
 		}
 		byte[] raw = key.getBytes();
 		SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
 		Cipher cipher = Cipher.getInstance(KEY_AES);
 		cipher.init(Cipher.DECRYPT_MODE, skeySpec);
 		byte[] encrypted1 = hex2byte(src);
 		byte[] original = cipher.doFinal(encrypted1);
 		String originalString = new String(original);
 		return originalString;
 	}
 
 	public static byte[] hex2byte(String strhex) {
 		if (strhex == null) {
 			return null;
 		}
 		int l = strhex.length();
 		if (l % 2 == 1) {
 			return null;
 		}
 		byte[] b = new byte[l / 2];
 		for (int i = 0; i != l / 2; i++) {
 			b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),
 					16);
 		}
 		return b;
 	}
 
 	public static String byte2hex(byte[] b) {
 		String hs = "";
 		String stmp = "";
 		for (int n = 0; n < b.length; n++) {
 			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
 			if (stmp.length() == 1) {
 				hs = hs + "0" + stmp;
 			} else {
 				hs = hs + stmp;
 			}
 		}
 		return hs.toUpperCase();
 	}
 
 }

Base64加密：

import org.apache.commons.codec.binary.Base64;
 
 /**
 * Base64组件
 * 
 * @author wbw
 * @version 1.0
 * @since 1.0
 */
 public abstract class Base64Util {
 
 	/**
 	 * 字符编码
 	 */
 	public final static String ENCODING = "UTF-8";
 
 	/**
 	 * Base64编码
 	 * 
 	 * @param data 待编码数据
 	 * @return String 编码数据
 	 * @throws Exception
 	 */
 	public static String encode(String data) throws Exception {
 
 		// 执行编码
 		byte[] b = Base64.encodeBase64(data.getBytes(ENCODING));
 
 		return new String(b, ENCODING);
 	}
 
 	/**
 	 * Base64安全编码 
 	 * 遵循RFC 2045实现
 	 * 
 	 * @param data
 	 * 待编码数据
 	 * @return String 编码数据
 	 * 
 	 * @throws Exception
 	 */
 	public static String encodeSafe(String data) throws Exception {
 
 		// 执行编码
 		byte[] b = Base64.encodeBase64(data.getBytes(ENCODING), true);
 
 		return new String(b, ENCODING);
 	}
 
 	/**
 	 * Base64解码
 	 * 
 	 * @param data 待解码数据
 	 * @return String 解码数据
 	 * @throws Exception
 	 */
 	public static String decode(String data) throws Exception {
 
 		// 执行解码
 		byte[] b = Base64.decodeBase64(data.getBytes(ENCODING));
 
 		return new String(b, ENCODING);
 	}
 
 }

DES加密：

import java.security.Key;
 import java.security.SecureRandom;
 import java.security.Security;
 
 import javax.crypto.Cipher;
 import javax.crypto.KeyGenerator;
 import javax.crypto.SecretKey;
 import javax.crypto.SecretKeyFactory;
 import javax.crypto.spec.DESKeySpec;
 
 import org.apache.commons.codec.binary.Base64;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 
 /**
 * DES安全编码组件
 * 
 * @author wbw
 * @version 1.0
 */
 public abstract class DESUtil {
 	static{
 		Security.insertProviderAt(new BouncyCastleProvider(), 1);
 	}
 	/**
 	 * 密钥算法 
 	 * Java 6 只支持56bit密钥 
 	 * Bouncy Castle 支持64bit密钥
 	 */
 	public static final String KEY_ALGORITHM = "DES";
 
 	/**
 	 * 加密/解密算法 / 工作模式 / 填充方式
 	 */
 	public static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5PADDING";
 
 	/**
 	 * 转换密钥
 	 * 
 	 * @param key
 	 * 二进制密钥
 	 * @return Key 密钥
 	 * @throws Exception
 	 */
 	private static Key toKey(byte[] key) throws Exception {
 
 		// 实例化DES密钥材料
 		DESKeySpec dks = new DESKeySpec(key);
 
 		// 实例化秘密密钥工厂
 		SecretKeyFactory keyFactory = SecretKeyFactory
 				.getInstance(KEY_ALGORITHM);
 
 		// 生成秘密密钥
 		SecretKey secretKey = keyFactory.generateSecret(dks);
 
 		return secretKey;
 	}
 
 	/**
 	 * 解密
 	 * 
 	 * @param data
 	 * 待解密数据
 	 * @param key
 	 * 密钥
 	 * @return byte[] 解密数据
 	 * @throws Exception
 	 */
 	public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
 
 		// 还原密钥
 		Key k = toKey(key);
 
 		// 实例化
 		Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
 
 		// 初始化，设置为解密模式
 		cipher.init(Cipher.DECRYPT_MODE, k);
 
 		// 执行操作
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 加密
 	 * 
 	 * @param data
 	 * 待加密数据
 	 * @param key
 	 * 密钥
 	 * @return byte[] 加密数据
 	 * @throws Exception
 	 */
 	public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
 
 		// 还原密钥
 		Key k = toKey(key);
 
 		// 实例化
 		Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
 
 		// 初始化，设置为加密模式
 		cipher.init(Cipher.ENCRYPT_MODE, k);
 
 		// 执行操作
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 生成密钥 
 	 * Java 6 只支持56bit密钥 
 	 * Bouncy Castle 支持64bit密钥 
 	 * 
 	 * @return byte[] 二进制密钥
 	 * @throws Exception
 	 */
 	public static byte[] initKey() throws Exception {
 
 		/*
 		 * 实例化密钥生成器
 		 * 
 		 * 若要使用64bit密钥注意替换 将下述代码中的KeyGenerator.getInstance(CIPHER_ALGORITHM);
 		 * 替换为KeyGenerator.getInstance(CIPHER_ALGORITHM, "BC");
 		 */
 		KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
 
 		/*
 		 * 初始化密钥生成器 若要使用64bit密钥注意替换 将下述代码kg.init(56); 替换为kg.init(64);
 		 */
 		kg.init(56, new SecureRandom());
 
 		// 生成秘密密钥
 		SecretKey secretKey = kg.generateKey();
 
 		// 获得密钥的二进制编码形式
 		return secretKey.getEncoded();
 	}
 	
 	public static byte[] initKey(String seed) throws Exception {
 		KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
 		SecureRandom secureRandom = new SecureRandom(new Base64().decode(seed)); 
 		kg.init(secureRandom);
 		SecretKey secretKey = kg.generateKey();
 		return secretKey.getEncoded();
 	}
 }

RSA加密：

import java.io.ByteArrayOutputStream;
 import java.security.Key;
 import java.security.KeyFactory;
 import java.security.KeyPair;
 import java.security.KeyPairGenerator;
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.SecureRandom;
 import java.security.Security;
 import java.security.interfaces.RSAPrivateKey;
 import java.security.interfaces.RSAPublicKey;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.security.spec.X509EncodedKeySpec;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.UUID;
 
 import javax.crypto.Cipher;
 
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.util.encoders.Base64;
 
 
 /**
 * RSA安全编码组件
 * 
 * @author wbw
 * @version 1.0
 */
 public class RSAUtil {
 	/**
 	 * 非对称加密密钥算法
 	 */
 	public static final String KEY_ALGORITHM_RSA = "RSA";
 
 	/**
 	 * 公钥
 	 */
 	private static final String RSA_PUBLIC_KEY = "RSAPublicKey";
 
 	/**
 	 * 私钥
 	 */
 	private static final String RSA_PRIVATE_KEY = "RSAPrivateKey";
 	
 	/**
 	 * RSA密钥长度 
 	 * 默认1024位，
 	 * 密钥长度必须是64的倍数， 
 	 * 范围在512至65536位之间。
 	 */
 	private static final int KEY_SIZE = 1024;
 	
 	static{
 		Security.insertProviderAt(new BouncyCastleProvider(), 1);
 	}
 	/**
 	 * 私钥解密
 	 * 
 	 * @param data
 	 * 待解密数据
 	 * @param key
 	 * 私钥
 	 * @return byte[] 解密数据
 	 * @throws Exception
 	 */
 	public static byte[] decryptByPrivateKey(byte[] data, byte[] key)
 			throws Exception {
 
 		// 取得私钥
 		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
 
 		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 
 		// 生成私钥
 		PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
 
 		// 对数据解密
 		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
 
 		cipher.init(Cipher.DECRYPT_MODE, privateKey);
 
 		int blockSize = cipher.getBlockSize();
 		if(blockSize>0){
 			ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
 			int j = 0;
 			while (data.length - j * blockSize > 0) {
 				bout.write(cipher.doFinal(data, j * blockSize, blockSize));
 				j++;
 			}
 			return bout.toByteArray();
 		}
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 公钥解密
 	 * 
 	 * @param data
 	 * 待解密数据
 	 * @param key
 	 * 公钥
 	 * @return byte[] 解密数据
 	 * @throws Exception
 	 */
 	public static byte[] decryptByPublicKey(byte[] data, byte[] key)
 			throws Exception {
 
 		// 取得公钥
 		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
 
 		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 
 		// 生成公钥
 		PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);
 
 		// 对数据解密
 		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
 
 		cipher.init(Cipher.DECRYPT_MODE, publicKey);
 
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 公钥加密
 	 * 
 	 * @param data
 	 * 待加密数据
 	 * @param key
 	 * 公钥
 	 * @return byte[] 加密数据
 	 * @throws Exception
 	 */
 	public static byte[] encryptByPublicKey(byte[] data, byte[] key)
 			throws Exception {
 
 		// 取得公钥
 		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
 
 		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 		
 		PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);
 
 		// 对数据加密
 		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
 
 		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
 		
 		int blockSize = cipher.getBlockSize();
 		if(blockSize>0){
 			int outputSize = cipher.getOutputSize(data.length);
 			int leavedSize = data.length % blockSize;
 			int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
 					: data.length / blockSize;
 			byte[] raw = new byte[outputSize * blocksSize];
 			int i = 0,remainSize=0;
 			while ((remainSize = data.length - i * blockSize) > 0) {
 				int inputLen = remainSize > blockSize?blockSize:remainSize;
 				cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);
 				i++;
 			}
 			return raw;
 		}
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 私钥加密
 	 * 
 	 * @param data
 	 * 待加密数据
 	 * @param key
 	 * 私钥
 	 * @return byte[] 加密数据
 	 * @throws Exception
 	 */
 	public static byte[] encryptByPrivateKey(byte[] data, byte[] key)
 			throws Exception {
 
 		// 取得私钥
 		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
 
 		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 
 		// 生成私钥
 		PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
 
 		// 对数据加密
 		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
 
 		cipher.init(Cipher.ENCRYPT_MODE, privateKey);
 
 		int blockSize = cipher.getBlockSize();
 		if(blockSize>0){
 			int outputSize = cipher.getOutputSize(data.length);
 			int leavedSize = data.length % blockSize;
 			int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
 					: data.length / blockSize;
 			byte[] raw = new byte[outputSize * blocksSize];
 			int i = 0,remainSize=0;
 			while ((remainSize = data.length - i * blockSize) > 0) {
 				int inputLen = remainSize > blockSize?blockSize:remainSize;
 				cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);
 				i++;
 			}
 			return raw;
 		}
 		return cipher.doFinal(data);
 	}
 
 	/**
 	 * 取得私钥
 	 * 
 	 * @param keyMap
 	 * 密钥Map
 	 * @return key 私钥
 	 * @throws Exception
 	 */
 	public static Key getPrivateKey(Map<String, Key> keyMap)
 			throws Exception {
 		return keyMap.get(RSA_PRIVATE_KEY);
 	}
 
 	/**
 	 * 取得私钥
 	 * 
 	 * @param keyMap
 	 * 密钥Map
 	 * @return byte[] 私钥
 	 * @throws Exception
 	 */
 	public static byte[] getPrivateKeyByte(Map<String, Key> keyMap)
 			throws Exception {
 		return keyMap.get(RSA_PRIVATE_KEY).getEncoded();
 	}
 	
 	/**
 	 * 取得公钥
 	 * 
 	 * @param keyMap
 	 * 密钥Map
 	 * @return key 公钥
 	 * @throws Exception
 	 */
 	public static Key getPublicKey(Map<String, Key> keyMap)
 			throws Exception {
 		return keyMap.get(RSA_PUBLIC_KEY);
 	}
 	
 	/**
 	 * 取得公钥
 	 * 
 	 * @param keyMap
 	 * 密钥Map
 	 * @return byte[] 公钥
 	 * @throws Exception
 	 */
 	public static byte[] getPublicKeyByte(Map<String, Key> keyMap)
 			throws Exception {
 		return keyMap.get(RSA_PUBLIC_KEY).getEncoded();
 	}
 	
 	/**
 	 * 初始化密钥
 	 * @param byte[] seed 种子
 	 * @return Map 密钥Map
 	 * @throws Exception
 	 */
 	public static Map<String,Key> initKey(byte[] seed)throws Exception{
 		// 实例化密钥对生成器
 		KeyPairGenerator keyPairGen = KeyPairGenerator
 				.getInstance(KEY_ALGORITHM_RSA);
 
 		// 初始化密钥对生成器
 		keyPairGen.initialize(KEY_SIZE,	new SecureRandom(seed) );
 
 		// 生成密钥对
 		KeyPair keyPair = keyPairGen.generateKeyPair();
 
 		// 公钥
 		RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
 
 		// 私钥
 		RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
 
 		// 封装密钥
 		Map<String, Key> keyMap = new HashMap<String, Key>(2);
 
 		keyMap.put(RSA_PUBLIC_KEY, publicKey);
 		keyMap.put(RSA_PRIVATE_KEY, privateKey);
 
 		return keyMap;
 	}
 	
 	/**
 	 * 初始化密钥
 	 * @param seed 种子
 	 * @return Map 密钥Map
 	 * @throws Exception
 	 */
 	public static Map<String,Key> initKey(String seed)throws Exception{
 		return initKey(seed.getBytes());
 	}
 
 	/**
 	 * 初始化密钥
 	 * 
 	 * @return Map 密钥Map
 	 * @throws Exception
 	 */
 	public static Map<String, Key> initKey() throws Exception {
 		return initKey(UUID.randomUUID().toString().getBytes());
 	}
 	
 	public static PublicKey getPublicRSAKey(String key) throws Exception {
 		X509EncodedKeySpec x509 = new X509EncodedKeySpec(Base64.decode(key));
 		KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 		return kf.generatePublic(x509);
 	}
 
 	public static PrivateKey getPrivateRSAKey(String key) throws Exception {
 		PKCS8EncodedKeySpec pkgs8 = new PKCS8EncodedKeySpec(Base64.decode(key));
 		KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
 		return kf.generatePrivate(pkgs8);
 	}
 
 }