Java 常用的 4 种加密方式（MD5+Base64+SHA+BCrypt）

一、工具类

• md5加密工具类

1.  
   public class MD5Utils {
    
    
    
   private static final String hexDigIts[] = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
    
    
    
   /**
    
   * MD5加密
    
   * @param origin 字符
    
   * @param charsetname 编码
    
   * @return
    
   */
    
   public static String MD5Encode(String origin, String charsetname){
    
   String resultString = null;
    
   try{
    
   resultString = new String(origin);
    
   MessageDigest md = MessageDigest.getInstance("MD5");
    
   if(null == charsetname || "".equals(charsetname)){
    
   resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
    
   }else{
    
   resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
    
   }
    
   }catch (Exception e){
    
   }
    
   return resultString;
    
   }
    
    
    
    
    
   public static String byteArrayToHexString(byte b[]){
    
   StringBuffer resultSb = new StringBuffer();
    
   for(int i = 0; i < b.length; i++){
    
   resultSb.append(byteToHexString(b[i]));
    
   }
    
   return resultSb.toString();
    
   }
    
    
    
   public static String byteToHexString(byte b){
    
   int n = b;
    
   if(n < 0){
    
   n += 256;
    
   }
    
   int d1 = n / 16;
    
   int d2 = n % 16;
    
   return hexDigIts[d1] + hexDigIts[d2];
    
   }
    
    
    
   }

    

 

• base64加密工具类 

1. public class Base64Util {
    
    
    
   // 字符串编码
    
   private static final String UTF_8 = "UTF-8";
    
    
    
   /**
    
   * 加密字符串
    
   * @param inputData
    
   * @return
    
   */
    
   public static String decodeData(String inputData) {
    
   try {
    
   if (null == inputData) {
    
   return null;
    
   }
    
   return new String(Base64.decodeBase64(inputData.getBytes(UTF_8)), UTF_8);
    
   } catch (UnsupportedEncodingException e) {
    
   }
    
   return null;
    
   }
    
    
    
   /**
    
   * 解密加密后的字符串
    
   * @param inputData
    
   * @return
    
   */
    
   public static String encodeData(String inputData) {
    
   try {
    
   if (null == inputData) {
    
   return null;
    
   }
    
   return new String(Base64.encodeBase64(inputData.getBytes(UTF_8)), UTF_8);
    
   } catch (UnsupportedEncodingException e) {
    
   }
    
   return null;
    
   }
    
    
    
   public static void main(String[] args) {
    
   System.out.println(Base64Util.encodeData("我是中文"));
    
   String enStr = Base64Util.encodeData("我是中文");
    
   System.out.println(Base64Util.decodeData(enStr));
    
   }
    
   }

    

• Bcrypt工具类

  1.  
     public class BcryptCipher {
      
     // generate salt seed
      
     private static final int SALT_SEED = 12;
      
     // the head fo salt
      
     private static final String SALT_STARTSWITH = "$2a$12";
      
      
      
     public static final String SALT_KEY = "salt";
      
      
      
     public static final String CIPHER_KEY = "cipher";
      
      
      
     /**
      
     * Bcrypt encryption algorithm method
      
     * @param encryptSource
      
     * need to encrypt the string
      
     * @return Map , two values in Map , salt and cipher
      
     */
      
     public static Map Bcrypt(final String encryptSource) {
      
     String salt = BCrypt.gensalt(SALT_SEED);
      
     Map bcryptResult = Bcrypt(salt, encryptSource);
      
     return bcryptResult;
      
     }
      
     /**
      
     *
      
     * @param salt encrypt salt, Must conform to the rules
      
     * @param encryptSource
      
     * @return
      
     */
      
     public static Map Bcrypt(final String salt, final String encryptSource) {
      
     if (StringUtils.isBlank(encryptSource)) {
      
     throw new RuntimeException("Bcrypt encrypt input params can not be empty");
      
     }
      
      
      
     if (StringUtils.isBlank(salt) || salt.length() != 29) {
      
     throw new RuntimeException("Salt can't be empty and length must be to 29");
      
     }
      
     if (!salt.startsWith(SALT_STARTSWITH)) {
      
     throw new RuntimeException("Invalid salt version, salt version is $2a$12");
      
     }
      
      
      
     String cipher = BCrypt.hashpw(encryptSource, salt);
      
     Map bcryptResult = new HashMap();
      
     bcryptResult.put(SALT_KEY, salt);
      
     bcryptResult.put(CIPHER_KEY, cipher);
      
     return bcryptResult;
      
     }
      
      
      
     }

      

   

二、加密测试

MD5加密测试

1.  
   /**
    
   * MD5加密
    
   */
    
   public class MD5Test {
    
   public static void main(String[] args) {
    
   String string = "你好 世界";
    
   String byteArrayToHexString = MD5Utils.byteArrayToHexString(string.getBytes());
    
   System.out.println(byteArrayToHexString);//e68891e698afe4b880e58fa5e8af9d
    
    
    
   }
    
   }

    

base64加密测试

1.  
    
    
   /**
    
   * base64加密
    
   */
    
   public class Bast64Tester {
    
    
    
   public static void main(String[] args) {
    
   String string = "你好 世界";
    
   String encodeData = Base64Util.encodeData(string); //加密
    
   String decodeData = Base64Util.decodeData(encodeData); //解密
    
   System.out.println(encodeData);//5oiR5piv5LiA5Liq5a2X56ym5Liy
    
   System.out.println(decodeData);//你好 世界
    
    
    
   }
    
   }

    

SHA加密测试

1.  
    
    
   /**
    
   * SHA加密
    
   */
    
   public class ShaTest {
    
    
    
   public static void main(String[] args) {
    
   String string = "你好 世界";
    
    
    
   String sha256Crypt = Sha2Crypt.sha256Crypt(string.getBytes());
    
   System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC
    
    
    
   }
    
   }

    

• BCrypt加密测试

  1.  
     /**
      
     * BCrypt加密
      
     */
      
     public class BCryptTest {
      
      
      
     public static void main(String[] args) {
      
      
      
     String string = "你好世界";
      
     Map bcrypt = BcryptCipher.Bcrypt(string);
      
     System.out.println(bcrypt.keySet()); //[cipher, salt]
      
      
      
     System.out.println(bcrypt.get("cipher")); //$2a$12$ylb92Z84gqlrSfzIztlCV.dK0xNbw.pOv3UwXXA76llOsNRTJsE/.
      
     System.out.println(bcrypt.get("salt")); //$2a$12$ylb92Z84gqlrSfzIztlCV.
      
      
      
     Map bcrypt2 = BcryptCipher.Bcrypt(bcrypt.get("salt"),string);
      
     System.out.println(bcrypt2.get("SALT_KEY")); //null
      
     System.out.println(bcrypt2.get("CIPHER_KEY")); //null
      
     }
      
     }