package com.yeshi.buwan.util;
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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.io.RandomAccessFile;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class SHA1Util {
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public static String getFileMD5(File file) {
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if (!file.isFile()) {
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return null;
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}
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MessageDigest digest = null;
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FileInputStream in = null;
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byte buffer[] = new byte[1024];
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int len;
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try {
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digest = MessageDigest.getInstance("SHA-1");
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in = new FileInputStream(file);
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while ((len = in.read(buffer, 0, 1024)) != -1) {
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digest.update(buffer, 0, len);
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}
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in.close();
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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return byte2hex(digest.digest());
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}
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public static String byte2hex(byte abyte0[]) {
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StringBuilder stringbuilder = new StringBuilder("");
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int i = 0;
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while (i < abyte0.length) {
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String s = Integer.toHexString(0xff & abyte0[i]);
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String s1;
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if (s.length() == 1)
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s1 = (new StringBuilder()).append("0").append(s).toString();
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else
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s1 = s;
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stringbuilder.append(s1);
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i++;
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}
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return stringbuilder.toString().trim();
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}
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public static String leshiYunSHA1(File file)
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throws NoSuchAlgorithmException, IOException {
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MessageDigest messagedigest = MessageDigest.getInstance("SHA-1");
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RandomAccessFile randomaccessfile1 = new RandomAccessFile(file, "r");
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byte abyte0[] = new byte[0x10000];
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long l;
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int j;
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int k;
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if (file.length() % 8L == 0L)
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l = file.length() / 8L;
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else
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l = 1L + file.length() / 8L;
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for (int i = 0; i < 8; i++) {
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randomaccessfile1.seek(l * (long) i);
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j = 0;
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do {
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if (j >= 0x10000)
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break;
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k = randomaccessfile1.read(abyte0);
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if (k <= 0)
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break;
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messagedigest.update(abyte0, 0, k);
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j += k;
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} while (true);
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}
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messagedigest.update(String.valueOf(file.length()).getBytes());
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return byte2hex(messagedigest.digest());
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}
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}
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