package com.qxueyou.scc.sdk.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class MD5Util {
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protected static char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };
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protected static MessageDigest messagedigest = null;
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static{
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try{
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messagedigest = MessageDigest.getInstance("MD5");
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}catch(NoSuchAlgorithmException nsaex){
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System.err.println(MD5Util.class.getName()+"初始化失败,MessageDigest不支持MD5Util。");
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nsaex.printStackTrace();
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}
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}
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public static String getFileMD5String(File file) throws IOException {
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FileInputStream in = new FileInputStream(file);
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FileChannel ch = in.getChannel();
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MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
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messagedigest.update(byteBuffer);
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return bufferToHex(messagedigest.digest());
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}
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public static String getMD5String(String s) {
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return getMD5String(s.getBytes());
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}
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public static String getMD5String(byte[] bytes) {
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messagedigest.update(bytes);
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return bufferToHex(messagedigest.digest());
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}
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private static String bufferToHex(byte bytes[]) {
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return bufferToHex(bytes, 0, bytes.length);
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}
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private static String bufferToHex(byte bytes[], int m, int n) {
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StringBuffer stringbuffer = new StringBuffer(2 * n);
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int k = m + n;
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for (int l = m; l < k; l++) {
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appendHexPair(bytes[l], stringbuffer);
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}
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return stringbuffer.toString();
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}
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private static void appendHexPair(byte bt, StringBuffer stringbuffer) {
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char c0 = hexDigits[(bt & 0xf0) >> 4];
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char c1 = hexDigits[bt & 0xf];
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stringbuffer.append(c0);
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stringbuffer.append(c1);
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}
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public static boolean checkPassword(String password, String md5PwdStr) {
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String s = getMD5String(password);
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return s.equals(md5PwdStr);
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}
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}
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