JAVA_MD5加密，SHA-1加密工具类

深碍√TFBOYSˉ_ 2022-08-06 15:22 125阅读 0赞

package com.util;
    
    import java.io.UnsupportedEncodingException;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    /**
     * MD5加密
     * @author Adam
     *
     */
    public class MD5Util {
    	/**
    	 * 功能：可逆的加密算法，执行一次加密，两次解密
    	 * @param inStr
    	 * @return
    	 */ 
        public static String convertDATA(String inStr){  
            char[] a = inStr.toCharArray();  
            for (int i = 0; i < a.length; i++){  
                a[i] = (char) (a[i] ^ 't');  
            }  
            String s = new String(a);  
            return s;  
        }
        
        /**
    	 * 功能：16位md5加密，生成32位密文
    	 * @param inStr
    	 * @return
    	 */
        public static String MD5_16(String inStr) {
    		String result = null;
    		try {
    			MessageDigest md = MessageDigest.getInstance("MD5");
    			md.update(inStr.getBytes());
    			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));
    			}
    			result = buf.toString().substring(8, 24);
    //			System.out.println("mdt 16bit: " + buf.toString().substring(8, 24));//md5 16bit
    //			System.out.println("md5 32bit: " + buf.toString());//md5 32bit
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    		}
    		return result;
    	}
    	
    	/**
    	 * 功能：32位md5加密，生成64位密文
    	 * @param inStr
    	 * @return
    	 */
    	public static String MD5_32(String inStr) {
    		  MessageDigest md5 = null;   
    		  try {   
    			   md5 = MessageDigest.getInstance("MD5");   
    		  } catch (Exception e) {   
    			   System.out.println(e.toString());   
    			   e.printStackTrace();   
    			   return "";   
    		  }   
    		  char[] charArray = inStr.toCharArray();   
    		  byte[] byteArray = new byte[charArray.length];   
    		  
    		  for (int i = 0; i < charArray.length; i++)   
    			  byteArray[i] = (byte) charArray[i];   
    		  
    		  byte[] md5Bytes = md5.digest(byteArray);   
    		  
    		  StringBuffer hexValue = new StringBuffer();   
    		  
    		  for (int i = 0; i < md5Bytes.length; i++) {   
    		     int val = ((int) md5Bytes[i]) & 0xff;   
    		     if (val < 16)   
    		        hexValue.append("0");   
    		     hexValue.append(Integer.toHexString(val));   
    		  }   
    		  
    		  return hexValue.toString();   
    	}   
    	
    	/**
    	 * 功能：sha-1加密
    	 * @param inStr
    	 * @return
    	 */
    	public static String SHA_1_40(String inStr) {
    		StringBuffer sb = new StringBuffer();
    		try {
    			MessageDigest md = MessageDigest.getInstance("SHA-1");
    			try {
    				md.update(inStr.getBytes("UTF-8"));
    			} catch (UnsupportedEncodingException e) {
    				e.printStackTrace();
    			}
    		    byte[] result = md.digest();
    		    for (byte b : result) {
    		        int i = b & 0xff;
    		        if (i < 0xf) {
    		            sb.append(0);
    		        }
    		        sb.append(Integer.toHexString(i));
    		    }
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    		}
    		return sb.toString();
    	}
    	 
    	 
    	public static void main(String[] args) {
    		String s = new String("123456");  
            System.out.println("原始：" + s);  
            System.out.println("加密的：" + convertDATA(s));  
            System.out.println("解密的：" + convertDATA(convertDATA(s))); 
            System.out.println("MD5_16：" + MD5_16(s));
            System.out.println("MD5_32：" + MD5_32(s));
            System.out.println("SHA_1_40：" + SHA_1_40(s));
    	}
    }