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MD5.java
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MD5.java
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/*
* Copyright (C) 2012 The CyanogenMod Project
*
* * Licensed under the GNU GPLv2 license
*
* The text of the license can be found in the LICENSE file
* or at https://www.gnu.org/licenses/gpl-2.0.txt
*/
package com.cyanogenmod.updater.utils;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5 {
private static final String TAG = "MD5";
public static boolean checkMD5(String md5, File updateFile) {
if (TextUtils.isEmpty(md5) || updateFile == null) {
Log.e(TAG, "MD5 string empty or updateFile null");
return false;
}
String calculatedDigest = calculateMD5(updateFile);
if (calculatedDigest == null) {
Log.e(TAG, "calculatedDigest null");
return false;
}
Log.v(TAG, "Calculated digest: " + calculatedDigest);
Log.v(TAG, "Provided digest: " + md5);
return calculatedDigest.equalsIgnoreCase(md5);
}
public static String calculateMD5(File updateFile) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
Log.e(TAG, "Exception while getting digest", e);
return null;
}
InputStream is;
try {
is = new FileInputStream(updateFile);
} catch (FileNotFoundException e) {
Log.e(TAG, "Exception while getting FileInputStream", e);
return null;
}
byte[] buffer = new byte[8192];
int read;
try {
while ((read = is.read(buffer)) > 0) {
digest.update(buffer, 0, read);
}
byte[] md5sum = digest.digest();
BigInteger bigInt = new BigInteger(1, md5sum);
String output = bigInt.toString(16);
// Fill to 32 chars
output = String.format("%32s", output).replace(' ', '0');
return output;
} catch (IOException e) {
throw new RuntimeException("Unable to process file for MD5", e);
} finally {
try {
is.close();
} catch (IOException e) {
Log.e(TAG, "Exception on closing MD5 input stream", e);
}
}
}
}