Java MD5, base64, AES encryption tools

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: 1. Encryption tools byte [] hex string into various 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 Nian 8 Yue 23 Ri
* /
public class EncryptUtil {

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

getMD5 static String public (byte [] Source) {
String S = null;
char hexdigits [] = {// for converting byte hexadecimal character representation to
'0', '1', '2', ' 3 ',' 4 ',' 5 ',' 6 ',' 7 ',' 8 ',' 9 ',' a ',' b ',' c ',' d ',' e ',' f ' };
the try {
the java.security.MessageDigest java.security.MessageDigest.getInstance MD = ( "the MD5");
md.update (Source);
byte tmp [] = md.digest (); // MD5 calculation result is a 128 bits long integer,
// in bytes is 16 bytes,
char str [] = new char [ 16 * 2]; // hexadecimal representation of each byte words, two characters,
// Therefore, expressed as hexadecimal characters requires 32
int k = 0; // represents the conversion result in the corresponding character position
for (int i = 0; i <16;i ++) {// start from the first byte of each byte of MD5
// converter 16 is converted into a hexadecimal character
byte byte0 = tmp [i]; // i take the first byte
str [k ++] = hexDigits [byte0 >>> 4 & 0xf ]; // get the high byte of the 4-digital conversion,
// logical shift right >>> to the right with the sign bit
str [k ++] = hexDigits [ byte0 & 0xf]; // get low byte 4 digitizer
}
S = new new String (STR); / results / after changing into a string
```
 } catch (Exception e) {
     e.printStackTrace();
 }
 return s;
```
}

public final static String MD5 (String inputStr ) {
character for encryption //
char md5String [] = { '0 ', '1', '2', '3', '4', '5', '6' , '. 7', '. 8', '. 9', 'A', 'B', 'C', 'D', 'E', 'F.'};
the try {
// use this utf-8 character set String encoded as byte sequences, storing the result into a byte array new
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();
  }
/**
- The byte [] into a variety of binary string
- @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 the converted string
  * /
  public static String binary (byte [] bytes, the radix int) {
  return new new a BigInteger (1, bytes) .toString (the radix); // here represents a positive number
  }
/**
- 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
```
- byte [] decoded after @return
- @throws Exception
  */
  public static byte[] base64Decode(String base64Code) throws Exception {
  return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
  }
/**
- Get byte [] value of md5
- @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();
  }
/**
- Gets the string value md5
- @param msg
- @return md5
- @throws Exception
  */
  public static byte[] md5(String msg) throws Exception {
  return StringUtils.isEmpty(msg) ? null : md5(msg.getBytes());
  }
/**
- Combined to achieve base64 md5 encryption
- @param msg
- ```
       待加密字符串
```
- After obtaining @return into base64 md5
- @throws Exception
  */
  public static String md5Encrypt(String msg) throws Exception {
  return StringUtils.isEmpty(msg) ? null : base64Encode(md5(msg));
  }
/**
- AES encryption
- @param content
- ```
       待加密的内容
```
- @param encryptKey
- ```
       加密密钥
```
- Encrypted byte [] @return
- @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 encryption to base 64 code
- @param content
- ```
       待加密的内容
```
- @param encryptKey
- ```
       加密密钥
```
- @return the base 64 code encryption
- @throws Exception
  */
  public static String aesEncrypt(String content, String encryptKey) throws Exception {
  return base64Encode(aesEncryptToBytes(content, encryptKey));
  }
/**
- AES decryption
- @param encryptBytes
- ```
       待解密的byte[]
```
- @param decryptKey
- ```
       解密密钥
```
- After the decryption @return 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);
  }
/**
- The base 64 code AES decryption
- @param encryptStr
- ```
       待解密的base 64 code
```
- @param decryptKey
- ```
       解密密钥
```
- @return string after decryption
- @throws Exception
  */
  public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
  return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
  }
/**
- Randomly generated secret key
  /
  public static String getKey () {
  the try {
  the KeyGenerator kg = KeyGenerator.getInstance ( "the AES");
  kg.init (128);
  // how many bits to be generated, only need to modify this to 128, or 192 256
  a SecretKey kg.generateKey SK = ();
  byte [] sk.getEncoded B = ();
  String byteToHexString S = (B);
  System.out.println (S);
  System.out.println ( "hex-tight key length is "+ s.length ());
  System.out.println (" length of the binary key is "+ s.length () . 4);
  return S;
  } the catch (NoSuchAlgorithmException E) {
  e.printStackTrace () ;
  System.out.println ( "no algorithm.");
  }
  return null;
  }
/**
- Generating a string using the specified secret key
  * /
  public static String getKeyByPass (String Pass) {
  // generates a secret key
  the try {
  the KeyGenerator kg = KeyGenerator.getInstance ( "the AES");
  // kg.init (128); // To how many generation, only need to modify here to 128, 192 or 256
  // SecureRandom is to generate secure random number sequence, password.getBytes () is a seed, as long as the same seed sequence is the same, so as to generate a secret key.
  SK = kg.generateKey a SecretKey ();
  a SecureRandom SecureRandom.getInstance = Random ( "SHA1PRNG");
  random.setSeed (pass.getBytes ());
  kg.init (128, Random);
  byte [] B = sk.getEncoded ( );
  String byteToHexString S = (B);
  return S;
  } the catch (NoSuchAlgorithmException E) {
  e.printStackTrace ();
  System.out.println ( "no algorithm.");
  }
  return null;
  }
/**
- byte array into a hexadecimal character string
- @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;
  }
  }
  /**
- The front and rear ends to support encryption and decryption
  * /
  public static String decryEncrypt (decryContent String, String decryKey) throws Exception {
  the try
  {
  String Data = decryContent;
  String Key = decryKey;
  String = decryKey IV;
```
 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 ( "encrypted content:" +
  - "18-1D-EA-A2-DC-F3"); //String y = aesEncrypt(x,
  - "b8d7b4820efb517e460c925f436a60f6");
  - System.err.println (getMD5 ( "18-1D-EA-A2-DC-F3")); //System.err.println ( "decrypted:"
  - - 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);
    }
    }

Author: Yun soft Technology - File Management System JornTang (micro letter of the same number)

Java MD5, base64, AES encryption tools

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