java 加密算法的工具类(SHA,AES,DES,CRC,MD5)

古城微笑少年丶 2022-04-18 02:47 388阅读 0赞

SHA工具类：

package com.haha.demo.util;
    
    import javax.crypto.Mac;
    import javax.crypto.spec.SecretKeySpec;
    import java.nio.charset.StandardCharsets;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    public class ShaUtil {
    	/**
    	 * SHA-256加密方法，根据输入字符串，进行SHA-256方式加密，返回加密后的字符串
    	 * @param src：要加密的原始字符串
    	 * @return 输入字符串有效（不为null），则返回SHA-256加密后的字符串；否则返回null
    	 */
    	public static String sha256(String src){
    		if(src == null){
    			return null;
    		}
    		MessageDigest sha256;
    		try {
    			sha256 = MessageDigest.getInstance("SHA-256");
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    			return null;
    		}
    		byte[] inStrArray = src.getBytes(StandardCharsets.UTF_8);
    		byte[] sha256Bytes = sha256.digest(inStrArray);
    		StringBuilder hexValue = new StringBuilder();
    		int val;
    		for (byte sha256Byte : sha256Bytes) {
    			val = ((int) sha256Byte) & 0xff;
    			if (val < 16) {
    				hexValue.append("0");
    			}
    			hexValue.append(Integer.toHexString(val));
    		}
    		return hexValue.toString();
    	}
    
    	/**
    	 * HmacSHA256加密方法
    	 * @param key：加密共享密匙
    	 * @param src：要加密的字符串
    	 * @return：成功返回加密后的字符串，否则返回null
    	 */
    	public static String hmacSha256(String key,String src){
    		if(key == null || src == null){
    			return null;
    		}
    		SecretKeySpec signKey = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
    		Mac mac;
    		try {
    			mac = Mac.getInstance("HmacSHA256");
    			mac.init(signKey);
    			byte[] hmacSha256Bytes = mac.doFinal(src.getBytes(StandardCharsets.UTF_8));
    			StringBuilder hexValue = new StringBuilder();
    			int val;
    			for (byte hmacSha256Byte : hmacSha256Bytes) {
    				val = ((int) hmacSha256Byte) & 0xff;
    				if (val < 16) {
    					hexValue.append("0");
    				}
    				hexValue.append(Integer.toHexString(val));
    			}
    			return hexValue.toString();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	public static void main(String[]args){
    		System.out.println(sha256("测试"));
    		System.out.println(hmacSha256("jiamimirao","测试"));
    	}
    }

AES工具类:

package com.haha.demo.util;
    
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    /**
     * AES加密,解密
     * @author ljh
     *
     */
    public class AesUtil {
    
    	public static void main(String[] args){
    		try {
    			String encryptStr = encrypt("111", "A1B845F45BC6EF59" , "1234567890123456");
    			System.out.println(encryptStr);
    			String decrypt = decrypt(encryptStr, "A1B845F45BC6EF59" , "1234567890123456");
    			System.out.println(decrypt);
    
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 加密
    	 * @param content 待加密内容
    	 * @param key     密钥,16位16进制
    	 * @param iv      偏移量 ,16位16进制
    	 * @return string
    	 */
    	public static String encrypt(String content, String key, String iv) {
    		try {
    			SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");    //两个参数，第一个为私钥字节数组， 第二个为加密方式 AES或者DES
    			IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
    			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    			cipher.init(Cipher.ENCRYPT_MODE, keySpec,ivSpec);
    			byte[] byteResult = cipher.doFinal(content.getBytes());
    			return parseByte2HexStr(byteResult);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 解密
    	 * @param encryptStr 待加密内容
    	 * @param key     密钥,16位16进制
    	 * @param iv      偏移量 ,16位16进制
    	 * @return string
    	 */
    	public static String decrypt(String encryptStr, String key , String iv) {
    		try {
    			SecretKeySpec  keySpec = new SecretKeySpec(key.getBytes(), "AES");    //两个参数，第一个为私钥字节数组， 第二个为加密方式 AES或者DES
    			IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
    			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    			cipher.init(Cipher.DECRYPT_MODE, keySpec,ivSpec);
    			byte[] result = cipher.doFinal(parseHexStr2Byte(encryptStr));
    			return new String(result).trim();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    
    	/**
    	 * 将二进制转成16进制
    	 * @param buf
    	 * @return String
    	 */
    	public static String parseByte2HexStr(byte buf[]) {
    		StringBuilder sb = new StringBuilder();
    		for (byte aBuf : buf) {
    			String hex = Integer.toHexString(aBuf & 0xFF);
    			if (hex.length() == 1) {
    				hex = '0' + hex;
    			}
    			sb.append(hex.toUpperCase());
    		}
    		return sb.toString();
    	}
    
    	/**
    	 * 将16进制转成2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;
    	}
    }

DES工具类:

package com.haha.demo.util;
    
    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.DESKeySpec;
    import javax.crypto.spec.IvParameterSpec;
    
    
    public class DesUtil {
    	public static void main(String[]args){
    		System.out.println(encrypt("测试加密123", "adbcd123"));
    		String neirong = encrypt("测试加密123", "adbcd123");
    		System.out.println(decrypt(neirong,"adbcd123"));
    	}
    
    	/**
    	 * 加密
    	 * @param data  待加密的内容
    	 * @param sKey  密钥
    	 * @return
    	 */
    	public static String encrypt(String data, String sKey) {
    		try {
    			byte[] key = sKey.getBytes();
    			// 初始化向量
    			IvParameterSpec iv = new IvParameterSpec(key);
    			DESKeySpec desKey = new DESKeySpec(key);
    			// 创建一个密匙工厂，然后用它把DESKeySpec转换成securekey
    			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    			SecretKey securekey = keyFactory.generateSecret(desKey);
    			// Cipher对象实际完成加密操作
    			Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    			// 用密匙初始化Cipher对象
    			cipher.init(Cipher.ENCRYPT_MODE, securekey, iv);
    			// 现在，获取数据并加密
    			// 正式执行加密操作
    			byte[] byteResult =  cipher.doFinal(data.getBytes());
    			return parseByte2HexStr(byteResult);
    		} catch (Throwable e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 解密
    	 * @param src  待加密的内容
    	 * @param sKey  秘钥
    	 * @return
    	 */
    	public static String decrypt(String src, String sKey) {
    		try {
    			byte[] key = sKey.getBytes();
    			// 初始化向量
    			IvParameterSpec iv = new IvParameterSpec(key);
    			// 创建一个DESKeySpec对象
    			DESKeySpec desKey = new DESKeySpec(key);
    			// 创建一个密匙工厂
    			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    			// 将DESKeySpec对象转换成SecretKey对象
    			SecretKey securekey = keyFactory.generateSecret(desKey);
    			// Cipher对象实际完成解密操作
    			Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    			// 用密匙初始化Cipher对象
    			cipher.init(Cipher.DECRYPT_MODE, securekey, iv);
    			// 真正开始解密操作
    			byte[] result = cipher.doFinal(parseHexStr2Byte(src));
    			return new String(result).trim();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 将二进制转换成16进制
    	 *
    	 * @param buf
    	 * @return
    	 */
    	public static String parseByte2HexStr(byte buf[]) {
    		StringBuilder sb = new StringBuilder();
    		for (byte aBuf : buf) {
    			String hex = Integer.toHexString(aBuf & 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;
    	}
    }

MD5工具类:

package com.haha.demo.util;
    
    import java.nio.charset.StandardCharsets;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    public class Md5Util {
    
    	/**
    	 * MD5加密方法，根据输入字符串，进行md5加密后，输出加密后的字符串
    	 * @param src：要加密的原始字符串
    	 * @return：输入字符串有效（不为null），则返回MD5加密后的字符串；否则返回null
    	 */
    	public static String md5(String src){
    		if(src == null){
    			return null;
    		}
    		MessageDigest md5;
    		try {
    			md5 = MessageDigest.getInstance("MD5");
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    			return null;
    		}
    		byte[] inStrArray = src.getBytes(StandardCharsets.UTF_8);
    		byte[] md5Bytes = md5.digest(inStrArray);
    		StringBuilder hexValue = new StringBuilder();
    		int val;
    		for (byte md5Byte : md5Bytes) {
    			val = ((int) md5Byte) & 0xff;
    			if (val < 16) {
    				hexValue.append("0");
    			}
    			hexValue.append(Integer.toHexString(val));
    		}
    		return hexValue.toString();
    	}
    
    	public static void main(String[]args){
    		System.out.println(md5("测试123"));
    		System.out.println(md5("abc123"));
    
    	}
    
    }

CRC工具类：

package com.haha.demo.util;
    
    import java.util.zip.CRC32;
    
    public class CRC32Util {
    	public static void main(String[]args){
    		System.out.println(getCrc32("测试123"));
    		System.out.println(getCrc32("ab123"));
    	}
    
    
    	public static String getCrc32(String content){
    		CRC32 crc32 = new CRC32();
    		crc32.update(content.getBytes());
    		Long value = crc32.getValue();
    		return Long.toHexString(value);
    	}
    }