C # and Java MD5 Simple validation (instance code) _c# Tutorial

C # end

Using System;
Using System.IO;

Using System.Security.Cryptography; Namespace the MD5 value of the computed file {class Md5_helper {///<summary>///file MD5 checksum///</summary>///< param name= "pathName" > File absolute path </param>///&LT;RETURNS&GT;MD5 checksum Code </returns> public string Getmd5hash (s
      Tring pathName) {string strresult = "";
      String strhashdata = "";
      Byte[] Arrbythashvalue;
      FileStream ofilestream = null;
      MD5CryptoServiceProvider omd5hasher = new MD5CryptoServiceProvider ();
        try {ofilestream = new FileStream (PathName, FileMode.Open, FileAccess.Read, fileshare.readwrite);
        Arrbythashvalue = Omd5hasher.computehash (Ofilestream);//Compute the hash value of the specified Stream object Ofilestream.close ();
        A string of hexadecimal pairs separated by hyphens in which each pair represents the corresponding element in value, such as "f-2c-4a" Strhashdata = bitconverter.tostring (Arrbythashvalue);
        Replacement-Strhashdata = Strhashdata.replace ("-", ""); strresult = StrhashData;

    The catch (System.Exception ex) {} return strresult;
    ///<summary>///byte array checksum///</summary>///<param name= "buffer" > to byte array </param> &LT;RETURNS&GT;MD5 Check Codes </returns> public string Getmd5hash (byte[] Buffer {string strresult = "
      ";
      String strhashdata = "";
      Byte[] Arrbythashvalue;
      MD5CryptoServiceProvider omd5hasher = new MD5CryptoServiceProvider (); try {arrbythashvalue = omd5hasher.computehash (buffer);//Compute the hash value//string of a specified stream object, consisting of a hexadecimal pair separated by hyphens,
        Each pair represents the corresponding element in value, such as "f-2c-4a" Strhashdata = bitconverter.tostring (Arrbythashvalue);
        Replacement-Strhashdata = Strhashdata.replace ("-", "");
      strresult = Strhashdata;

    The catch (System.Exception ex) {} return strresult;
 }
  }
}

Java end

Package com;
Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.security.MessageDigest;

Import java.security.NoSuchAlgorithmException; public class Md5util {/** * default password string combination, used to convert bytes into 16 characters, the correctness of the Apache download file is the default of this combination * * * protected static char He
	Xdigits[] = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F '};
	protected static MessageDigest messagedigest = null;
		static {try {messagedigest = messagedigest.getinstance ("MD5");
		catch (NoSuchAlgorithmException e) {e.printstacktrace (); } public static void Main (string[] args) throws IOException {byte[] buffer= "HelloWorld". GetBytes ();//byte array checksum St
		Ring MD55 = getfilemd5string (buffer);
	System.out.println ("md55:" + md55);
		public static String getfilemd5string (file file) throws IOException {InputStream fis;
		FIS = new FileInputStream (file);
		byte[] buffer = new byte[1024];
		int numread = 0;while ((Numread = fis.read (buffer)) > 0) {messagedigest.update (buffer, 0, numread);
		} fis.close ();
	Return Buffertohex (Messagedigest.digest ()); public static String getfilemd5string (byte[] buffer) throws IOException {messagedigest.update (buffer, 0, BUFFER.L
		Ength);
	Return Buffertohex (Messagedigest.digest ());
	private static String Buffertohex (byte bytes[]) {return Buffertohex (bytes, 0, bytes.length); 
		private static String Buffertohex (byte bytes[], int m, int n) {stringbuffer stringbuffer = new StringBuffer (2 * n);
		int k = m + N;
		for (int l = m; l < K; l++) {Appendhexpair (bytes[l], stringbuffer);
	return stringbuffer.tostring ();  } private static void Appendhexpair (Byte bt, StringBuffer stringbuffer) {char C0 = hexdigits[(BT & 0xf0) >> 4];//bytes High 4 digits conversion//to the logical right, move the symbol bit to the right, where there is no difference between the two symbols char C1 = HEXDIGITS[BT & 0xf];//byte low 4-bit number conversion Stringbuff
		Er.append (C0);
	Stringbuffer.append (C1); 


 }
}

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