Java MD5,base64,AES加密工具类

Posted jorntang

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import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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

import org.apache.commons.lang.StringUtils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**

  • ClassName: EncryptUtil
  • @Description: 加密工具类 1.将byte[]转为各种进制的字符串 2.base 64 encode 3.base 64 decode
  •           4.获取byte[]的md5值 5.获取字符串md5值 6.结合base64实现md5加密 7.AES加密
  •           8.AES加密为base 64 code 9.AES解密 10.将base 64 code AES解密
  • @author JornTang
  • @email 957707261@qq.com
  • @date 2017年8月23日
    */
    public class EncryptUtil {

    public static String encodePassword(String password) throws UnsupportedEncodingException {
    if (StringUtils.isEmpty(password)) {
    return password;
    }
    return getMD5(password.getBytes("utf-8"));
    }

    public static String getMD5(byte[] source) {
    String s = null;
    char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符
    ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ };
    try {
    java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
    md.update(source);
    byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数,
    // 用字节表示就是 16 个字节
    char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话,使用两个字符,
    // 所以表示成 16 进制需要 32 个字符
    int k = 0; // 表示转换结果中对应的字符位置
    for (int i = 0; i < 16; i++) { // 从第一个字节开始,对 MD5 的每一个字节
    // 转换成 16 进制字符的转换
    byte byte0 = tmp[i]; // 取第 i 个字节
    str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换,
    // >>> 为逻辑右移,将符号位一起右移
    str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
    }
    s = new String(str); // 换后的结果转换为字符串

     } catch (Exception e) {
         e.printStackTrace();
     }
     return s;

    }

    public final static String MD5(String inputStr) {
    // 用于加密的字符
    char md5String[] = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘ };
    try {
    // 使用utf-8字符集将此 String 编码为 byte序列,并将结果存储到一个新的 byte数组中
    byte[] btInput = inputStr.getBytes("utf-8");

         // 信息摘要是安全的单向哈希函数,它接收任意大小的数据,并输出固定长度的哈希值。
         MessageDigest mdInst = MessageDigest.getInstance("MD5");
    
         // MessageDigest对象通过使用 update方法处理数据, 使用指定的byte数组更新摘要
         mdInst.update(btInput);
    
         // 摘要更新之后,通过调用digest()执行哈希计算,获得密文
         byte[] md = mdInst.digest();
    
         // 把密文转换成十六进制的字符串形式
         int j = md.length;
         char str[] = new char[j * 2];
         int k = 0;
         for (int i = 0; i < j; i++) { // i = 0
             byte byte0 = md[i]; // 95
             str[k++] = md5String[byte0 >>> 4 & 0xf]; // 5
             str[k++] = md5String[byte0 & 0xf]; // F
         }
    
         // 返回经过加密后的字符串
         return new String(str);
    
     } catch (Exception e) {
         return null;
     }

    }

    public static String encryption(String plain) throws UnsupportedEncodingException {
    String re_md5 = new String();
    try {
    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(plain.getBytes("utf-8"));
    byte b[] = md.digest();

         int i;
    
         StringBuffer buf = new StringBuffer("");
         for (int offset = 0; offset < b.length; offset++) {
             i = b[offset];
             if (i < 0)
                 i += 256;
             if (i < 16)
                 buf.append("0");
             buf.append(Integer.toHexString(i));
         }
    
         re_md5 = buf.toString();
    
     } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
     }
     return re_md5;

    }

    public static String getMD5(String message) {
    String md5 = "";
    try {
    // Create a MD5 instance
    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] messageByte = message.getBytes("UTF-8");
    // get md5 byte array
    byte[] md5Byte = md.digest(messageByte);
    // switch to Hex
    md5 = bytesToHex(md5Byte);
    } catch (Exception e) {
    e.printStackTrace();
    }
    return md5;
    }

    /**
    • @param bytes
    • @return
      */
      public static String bytesToHex(byte[] bytes) {
      StringBuffer hexStr = new StringBuffer();
      int num;
      for (int i = 0; i < bytes.length; i++) {
      num = bytes[i];
      if (num < 0) {
      num += 256;
      }
      if (num < 16) {
      hexStr.append("0");
      }
      hexStr.append(Integer.toHexString(num));
      }
      return hexStr.toString().toUpperCase();
      }
    /**
    • 将byte[]转为各种进制的字符串
    • @param bytes
    •        byte[]
    • @param radix
    •        可以转换进制的范围,从Character.MIN_RADIX到Character.MAX_RADIX,超出范围后变为10进制
    • @return 转换后的字符串
      */
      public static String binary(byte[] bytes, int radix) {
      return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
      }
    /**
    • base 64 encode
    • @param bytes
    •        待编码的byte[]
    • @return 编码后的base 64 code
      */
      public static String base64Encode(byte[] bytes) {
      return new BASE64Encoder().encode(bytes);
      }
    /**
    • base 64 decode
    • @param base64Code
    •        待解码的base 64 code
    • @return 解码后的byte[]
    • @throws Exception
      */
      public static byte[] base64Decode(String base64Code) throws Exception {
      return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
      }
    /**
    • 获取byte[]的md5值
    • @param bytes
    •        byte[]
    • @return md5
    • @throws Exception
      */
      public static byte[] md5(byte[] bytes) throws Exception {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(bytes);
      return md.digest();
      }
    /**
    • 获取字符串md5值
    • @param msg
    • @return md5
    • @throws Exception
      */
      public static byte[] md5(String msg) throws Exception {
      return StringUtils.isEmpty(msg) ? null : md5(msg.getBytes());
      }
    /**
    • 结合base64实现md5加密
    • @param msg
    •        待加密字符串
    • @return 获取md5后转为base64
    • @throws Exception
      */
      public static String md5Encrypt(String msg) throws Exception {
      return StringUtils.isEmpty(msg) ? null : base64Encode(md5(msg));
      }
    /**
    • AES加密
    • @param content
    •        待加密的内容
    • @param encryptKey
    •        加密密钥
    • @return 加密后的byte[]
    • @throws Exception
      */
      public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
      KeyGenerator kgen = KeyGenerator.getInstance("AES");
      SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
      random.setSeed(encryptKey.getBytes());
      kgen.init(128, random);

      Cipher cipher = Cipher.getInstance("AES");
      cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));

      return cipher.doFinal(content.getBytes("utf-8"));
      }

    /**
    • AES加密为base 64 code
    • @param content
    •        待加密的内容
    • @param encryptKey
    •        加密密钥
    • @return 加密后的base 64 code
    • @throws Exception
      */
      public static String aesEncrypt(String content, String encryptKey) throws Exception {
      return base64Encode(aesEncryptToBytes(content, encryptKey));
      }
    /**
    • AES解密
    • @param encryptBytes
    •        待解密的byte[]
    • @param decryptKey
    •        解密密钥
    • @return 解密后的String
    • @throws Exception
      */
      public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
      KeyGenerator kgen = KeyGenerator.getInstance("AES");
      SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
      random.setSeed(decryptKey.getBytes());
      kgen.init(128, random);

      Cipher cipher = Cipher.getInstance("AES");
      cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
      byte[] decryptBytes = cipher.doFinal(encryptBytes);

      return new String(decryptBytes);
      }

    /**
    • 将base 64 code AES解密
    • @param encryptStr
    •        待解密的base 64 code
    • @param decryptKey
    •        解密密钥
    • @return 解密后的string
    • @throws Exception
      */
      public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
      return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
      }
    /**
    • 随机生成秘钥
      /
      public static String getKey() {
      try {
      KeyGenerator kg = KeyGenerator.getInstance("AES");
      kg.init(128);
      // 要生成多少位,只需要修改这里即可128, 192或256
      SecretKey sk = kg.generateKey();
      byte[] b = sk.getEncoded();
      String s = byteToHexString(b);
      System.out.println(s);
      System.out.println("十六进制密钥长度为" + s.length());
      System.out.println("二进制密钥的长度为" + s.length()
      4);
      return s;
      } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
      System.out.println("没有此算法。");
      }
      return null;
      }
    /**
    • 使用指定的字符串生成秘钥
      */
      public static String getKeyByPass(String pass) {
      // 生成秘钥
      try {
      KeyGenerator kg = KeyGenerator.getInstance("AES");
      // kg.init(128);//要生成多少位,只需要修改这里即可128, 192或256
      // SecureRandom是生成安全随机数序列,password.getBytes()是种子,只要种子相同,序列就一样,所以生成的秘钥就一样。
      SecretKey sk = kg.generateKey();
      SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
      random.setSeed(pass.getBytes());
      kg.init(128, random);
      byte[] b = sk.getEncoded();
      String s = byteToHexString(b);
      return s;
      } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
      System.out.println("没有此算法。");
      }
      return null;
      }
    /**
    • byte数组转化为16进制字符串
    • @param bytes
    • @return
      */
      public static String byteToHexString(byte[] bytes) {
      StringBuffer sb = new StringBuffer();
      for (int i = 0; i < bytes.length; i++) {
      String strHex = Integer.toHexString(bytes[i]);
      if (strHex.length() > 3) {
      sb.append(strHex.substring(6));
      } else {
      if (strHex.length() < 2) {
      sb.append("0" + strHex);
      } else {
      sb.append(strHex);
      }
      }
      }
      return sb.toString();
      }

    // 得到随机字符
    public static String randomStr(int n) {
    // ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
    String str1 = "123456789012345678901234567890";
    String str2 = "";
    int len = str1.length() - 1;
    double r;
    for (int i = 0; i < n; i++) {
    r = (Math.random()) * len;
    str2 = str2 + str1.charAt((int) r);
    }
    return str2;
    }

    // 得到随机密码
    public static String randomForPwd(int n) {
    String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    String str2 = "";
    int len = str1.length() - 1;
    double r;
    for (int i = 0; i < n; i++) {
    r = (Math.random()) * len;
    str2 = str2 + str1.charAt((int) r);
    }
    return str2;
    }

    /**
    • 支持前后端加解密
      */
      public static String encrypt(String encryContent, String encryKey) throws Exception {
      try {
      String data = encryContent;
      String key = encryKey;
      String iv = encryKey;

       Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
       int blockSize = cipher.getBlockSize();
      
       byte[] dataBytes = data.getBytes();
       int plaintextLength = dataBytes.length;
       if (plaintextLength % blockSize != 0) {
           plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
       }
      
       byte[] plaintext = new byte[plaintextLength];
       System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
      
       SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
       IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
      
       cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
       byte[] encrypted = cipher.doFinal(plaintext);
      
       return new sun.misc.BASE64Encoder().encode(encrypted);
      } catch (Exception e) {
      e.printStackTrace();
      return null;
      }
      }
      /**
    • 支持前后端加解密
      */
      public static String decryEncrypt(String decryContent, String decryKey) throws Exception {
      try
      {
      String data = decryContent;
      String key = decryKey;
      String iv = decryKey;

       byte[] encrypted1 = new BASE64Decoder().decodeBuffer(data);
      
       Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
       SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
       IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
      
       cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
      
       byte[] original = cipher.doFinal(encrypted1);
       String originalString = new String(original);
       return originalString;
      }
      catch (Exception e) {
      e.printStackTrace();
      return null;
      }
      }
      public static String sss(String myString){
      String newString=null;
      Pattern CRLF = Pattern.compile("( | | | )");
      Matcher m = CRLF.matcher(myString);
      if (m.find()) {
      newString = m.replaceAll("");
      }
      return newString;
      }
      /**
    • @param args
    • @throws Exception
      /
      public static void main(String[] args) throws Exception {
      /
      • String x = SeqUtil.getUUID(); System.err.println("加密内容:" +
      • "18-1D-EA-A2-DC-F3"); //String y = aesEncrypt(x,
      • "b8d7b4820efb517e460c925f436a60f6");
      • System.err.println(getMD5("18-1D-EA-A2-DC-F3")); //System.err.println("解密后:"
        • aesDecrypt(y, "b8d7b4820efb517e460c925f436a60f6")); // String
      • newStr=sss(aaa); // System.out.println(newStr);
        */ String x = "00-FF-9A-6C-60-B8";
        String md5 = EncryptUtil.getMD5(x);
        System.err.println(md5);
        }
        }

作者:云软科技-档案管理系统 JornTang (微信同号)

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