Java MD5,base64,AES加密工具类

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 [email protected]

• @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("(\r\n|\r|\n|\n\r)");
    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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