Java MD5,base64,AES加密工具类

拟墨画扇 提交于 2019-12-15 17:30:06

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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("(\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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