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Hash all files in one pass, dramatic speedup

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This commit is contained in:
Tad 2017-12-14 21:10:51 -05:00
parent b663a11ee9
commit 8199d43c6d
3 changed files with 56 additions and 32 deletions
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2
.idea/misc.xml generated
View file

@ -24,7 +24,7 @@
</value>
</option>
</component>
<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="JDK" project-jdk-type="JavaSDK">
<component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" project-jdk-name="JDK" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/build/classes" />
</component>
<component name="ProjectType">

12
app/src/main/java/us/spotco/malwarescanner/Database.java
View file

@ -33,9 +33,9 @@ public class Database {
signatureDatabases.add(new SignatureDatabase("https://spotco.us/clamav-main.hdb", "clamav-main.hdb"));
signatureDatabases.add(new SignatureDatabase("https://spotco.us/clamav-main.hsb", "clamav-main.hsb"));
signatureDatabases.add(new SignatureDatabase("http://clamav.bofhland.org/bofhland_malware_attach.hdb", "bofhland_malware_attach.hdb"));
signatureDatabases.add(new SignatureDatabase("http://cdn.malware.expert/malware.expert.hdb", "malware.expert.hdb"));
signatureDatabases.add(new SignatureDatabase("http://cdn.rfxn.com/downloads/rfxn.hdb", "rfxn.hdb"));
//signatureDatabases.add(new SignatureDatabase("http://clamav.bofhland.org/bofhland_malware_attach.hdb", "bofhland_malware_attach.hdb"));
//signatureDatabases.add(new SignatureDatabase("http://cdn.malware.expert/malware.expert.hdb", "malware.expert.hdb"));
//signatureDatabases.add(new SignatureDatabase("http://cdn.rfxn.com/downloads/rfxn.hdb", "rfxn.hdb"));
}
public static boolean doesDatabaseExist() {
@ -49,9 +49,9 @@ public class Database {
}
public static void loadDatabase(ArrayList<SignatureDatabase> signatureDatabases) {
signaturesMD5 = new HashMap<String, String>();
signaturesSHA1 = new HashMap<String, String>();
signaturesSHA256 = new HashMap<String, String>();
signaturesMD5.clear();
signaturesSHA1.clear();
signaturesSHA256.clear();
System.gc();
for (SignatureDatabase database : signatureDatabases) {
File databaseLocation = new File(databasePath + "/" + database.getName());

74
app/src/main/java/us/spotco/malwarescanner/MalwareScanner.java
View file

@ -12,7 +12,11 @@ import com.google.common.hash.Hashing;
import com.google.common.io.Files;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
@ -20,16 +24,20 @@ import java.util.Set;
public class MalwareScanner {
private Context context = null;
private TextView log = null;
private AsyncTask<Boolean, String, String> malwareScannerTask = null;
private static Context context = null;
private static TextView log = null;
private static AsyncTask<Boolean, String, String> malwareScannerTask = null;
private static HashMap<String, File> fileHashesMD5 = new HashMap<String, File>();
private static HashMap<String, File> fileHashesSHA1 = new HashMap<String, File>();
private static HashMap<String, File> fileHashesSHA256 = new HashMap<String, File>();
public MalwareScanner(Context context, TextView log) {
this.context = context;
this.log = log;
}
public void startScanner(boolean scanSystem, boolean scanApps, boolean scanInternal, boolean scanExternal) {
public static void startScanner(boolean scanSystem, boolean scanApps, boolean scanInternal, boolean scanExternal) {
if(Database.doesDatabaseExist()) {
malwareScannerTask = new MalwareScannerTask().execute(scanSystem, scanApps, scanInternal, scanExternal);
} else {
@ -48,11 +56,14 @@ public class MalwareScanner {
return malwareScannerTask.getStatus().equals(AsyncTask.Status.PENDING) || malwareScannerTask.getStatus().equals(AsyncTask.Status.RUNNING);
}
public class MalwareScannerTask extends AsyncTask<Boolean, String, String> {
public static class MalwareScannerTask extends AsyncTask<Boolean, String, String> {
@Override
protected void onPreExecute() {
log.append("Initiating scan...\n");
fileHashesMD5.clear();
fileHashesSHA1.clear();
fileHashesSHA256.clear();
}
@Override
@ -85,20 +96,19 @@ public class MalwareScanner {
}
publishProgress(filesToScan.size() + " files pending scan");
HashMap<String, File> fileHashesMD5 = new HashMap<String, File>();
HashMap<String, File> fileHashesSHA1 = new HashMap<String, File>();
HashMap<String, File> fileHashesSHA256 = new HashMap<String, File>();
Database.loadDatabase(Database.signatureDatabases);
publishProgress("Loaded " + Database.signaturesMD5.size() + " MD5 signatures");
publishProgress("Loaded " + Database.signaturesSHA1.size() + " SHA-1 signatures");
publishProgress("Loaded " + Database.signaturesSHA256.size() + " SHA-256 signatures\n");
publishProgress("Hashing files...");
for (File file : filesToScan) {
getFileHashes(file);
}
publishProgress("Calculated MD5/SHA-1/SHA-256 hashes for all files\n");
if (Database.signaturesMD5.size() > 0) {
for (File file : filesToScan) {
fileHashesMD5.put(getFileHashSum(file, Hashing.md5()), file);
}
publishProgress("Calculated MD5 hashes for all files");
for (Map.Entry<String, File> file : fileHashesMD5.entrySet()) {
String result = Database.checkInDatabase(file.getKey());
if (result != null) {
@ -111,10 +121,6 @@ public class MalwareScanner {
}
if (Database.signaturesSHA1.size() > 0) {
for (File file : filesToScan) {
fileHashesSHA1.put(getFileHashSum(file, Hashing.sha1()), file);
}
publishProgress("Calculated SHA-1 hashes for all files");
for (Map.Entry<String, File> file : fileHashesSHA1.entrySet()) {
String result = Database.checkInDatabase(file.getKey());
if (result != null) {
@ -127,9 +133,6 @@ public class MalwareScanner {
}
if (Database.signaturesSHA256.size() > 0) {
for (File file : filesToScan) {
fileHashesSHA256.put(getFileHashSum(file, Hashing.sha256()), file);
}
publishProgress("Calculated SHA-256 hashes for all files");
for (Map.Entry<String, File> file : fileHashesSHA256.entrySet()) {
String result = Database.checkInDatabase(file.getKey());
@ -159,7 +162,7 @@ public class MalwareScanner {
}
private Set<File> getFilesRecursive(File root) {
private static Set<File> getFilesRecursive(File root) {
Set<File> filesAll = new HashSet<>();
File[] files = root.listFiles();
@ -179,13 +182,34 @@ public class MalwareScanner {
return filesAll;
}
private String getFileHashSum(File file, HashFunction hash) {
private static void getFileHashes(File file) {
try {
return Files.asByteSource(file).hash(hash).toString();
} catch (IOException e) {
InputStream fis = new FileInputStream(file);
byte[] buffer = new byte[4096];
int numRead;
MessageDigest digestMD5 = MessageDigest.getInstance("MD5");
MessageDigest digestSHA1 = MessageDigest.getInstance("SHA-1");
MessageDigest digestSHA256 = MessageDigest.getInstance("SHA-256");
do {
numRead = fis.read(buffer);
if(numRead > 0) {
digestMD5.update(buffer, 0, numRead);
digestSHA1.update(buffer, 0, numRead);
digestSHA256.update(buffer, 0, numRead);
}
} while (numRead != -1);
fis.close();
fileHashesMD5.put(String.format("%032x", new BigInteger(1, digestMD5.digest())), file);
fileHashesSHA1.put(String.format("%032x", new BigInteger(1, digestSHA1.digest())), file);
fileHashesSHA256.put(String.format( "%064x", new BigInteger(1, digestSHA256.digest())), file);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}