An example analysis of MD5 encryption algorithm for Android programming _android

This paper analyzes the MD5 encryption algorithm of Android programming. Share to everyone for your reference, specific as follows:

Android MD5 encryption is exactly the same as the J2SE platform, because the Android platform supports the Java.security.MessageDigest package. is actually exactly the same as the J2SE platform.

Algorithm Signature:

Copy Code code as follows:

String GetMD5 (String val) throws NoSuchAlgorithmException

Enter a string (text that needs to be encrypted), and get an encrypted output string (the encrypted text)

Package com.tencent.utils;
Import Java.security.MessageDigest;
Import java.security.NoSuchAlgorithmException;
/** 
 * External supply getMD5 (String) method 
 * @author Randyjia * * */Public 
class MD5 {public
 static String GetMD5 (String val) throws nosuchalgorithmexception{
  messagedigest MD5 = messagedigest.getinstance ("MD5");
  Md5.update (Val.getbytes ());
  byte[] m = md5.digest ()//Encrypted return
  getString (m);
 private static String getString (byte[] b) {
  StringBuffer sb = new StringBuffer ();
   for (int i = 0; i < b.length i + +) {
   sb.append (b[i]);
   }
   return sb.tostring ();
}

End

 
* * MD5 Encryption 
* 
/private string Getmd5str (String str) {
  messagedigest messagedigest = null;
  try {
   messagedigest = messagedigest.getinstance ("MD5");
   Messagedigest.reset ();
   Messagedigest.update (Str.getbytes ("UTF-8"));
  } catch (NoSuchAlgorithmException e) {
   System.out.println ("NoSuchAlgorithmException caught!");
   System.exit ( -1);
  } catch (Unsupportedencodingexception e) {
   e.printstacktrace ();
  }
  byte[] ByteArray = Messagedigest.digest ();
  StringBuffer Md5strbuff = new StringBuffer ();
  for (int i = 0; i < bytearray.length i++) {
   if (integer.tohexstring (0xFF & Bytearray[i)). Length () = 1)
    Md5strbuff.append ("0"). Append (integer.tohexstring (0xFF & Bytearray[i));
   else
    md5strbuff.append (integer.tohexstring (0xFF & Bytearray[i]));
 16-bit encryption, from 9th to 25-bit return
  md5strbuff.substring (8,). ToString (). toUpperCase ();
}

Add: Android MD5 Cryptographic String Example

This encrypts the string MD5, returning the encrypted string (actually the message digest of the string).

public static string MD5 (String string) {
 byte[] hash;
 try {
  hash = messagedigest.getinstance ("MD5"). Digest (String.getbytes ("UTF-8"));
 NoSuchAlgorithmException e) {
  throw new RuntimeException ("Huh, MD5 should be supported?", E);
 } catch (Unsupporte Dencodingexception e) {
  throw new RuntimeException ("Huh, UTF-8 should be supported?", E);
 }
 StringBuilder hex = new StringBuilder (Hash.length * 2);
 for (byte b:hash) {
  if ((b & 0xFF) < 0x10) Hex.append ("0");
  Hex.append (integer.tohexstring (b & 0xFF));
 }
 return hex.tostring ();
}

I hope this article will help you with the Android program.