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				package com.ll.smsbeans;
				
				/**
				 * @author lisong
				 *
				 * 
				 */
				import java.security.MessageDigest;
				
				/*************************************************
				md5 类实现了RSA Data Security, Inc.在提交给IETF
				的RFC1321中的MD5 message-digest 算法。
				*************************************************/
				
				public class MD5
				{
				
					public static String replaceString(String origin, String src, String dest)
					{
						if (origin == null)
							return null;
						StringBuffer sb = new StringBuffer(origin.length());
				
						int srcLength = src.length();
						int destLength = dest.length();
				
						int preOffset = 0;
						int offset = 0;
						while ((offset = origin.indexOf(src, preOffset)) != -1)
						{
							sb.append(origin.substring(preOffset, offset));
							sb.append(dest);
							preOffset = offset + srcLength;
						}
						sb.append(origin.substring(preOffset, origin.length()));
				
						return sb.toString();
					}
				
					public static String md5(String str)
					{
						try
						{
							MessageDigest md = MessageDigest.getInstance("MD5");
							md.update(str.getBytes());
				
							byte[] b = md.digest();
							StringBuffer sb = new StringBuffer();
							for (int i = 0; i < b.length; i++)
							{
								int v = (int) b[i];
								v = v < 0 ? 0x100 + v : v;
								String cc = Integer.toHexString(v);
								if (cc.length() == 1)
									sb.append('0');
								sb.append(cc);
							}
				
							return sb.toString();
						} catch (Exception e)
						{
						}
						return "";
					}
				
					public static byte[] md5(byte[] ba)
					{
						byte[] b = new byte[16];
				
						try
						{
							MessageDigest md = MessageDigest.getInstance("MD5");
							md.update(ba);
							b = md.digest();
				
							return b;
						} catch (Exception e)
						{
						}
						return b;
				
					}
					public static void main(String args[])
					{
				
						MD5 m = new MD5();
						if (args.length == 0)
						{ //如果没有参数，执行标准的Test Suite
				
							System.out.println("MD5 Test suite:");
							System.out.println("MD5(\"\"):" + m.md5(""));
							System.out.println("MD5(\"a\"):" + m.md5("a"));
							System.out.println("MD5(\"abc\"):" + m.md5("abc"));
							System.out.println(
								"MD5(\"message digest\"):" + m.md5("message digest"));
							System.out.println(
								"MD5(\"abcdefghijklmnopqrstuvwxyz\"):"
									+ m.md5("abcdefghijklmnopqrstuvwxyz"));
							System.out.println(
								"MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"
									+ m.md5(
										"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
						} else
							System.out.println("MD5(" + args[0] + ")=" + m.md5(args[0]));
				
					}
				
				}