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Truncate all hashes to 16 characters to save memory

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This commit is contained in:
Tad 2017-12-27 17:15:38 -05:00
parent ed4d031d1f
commit 0720ccbec1
4 changed files with 9 additions and 8 deletions
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2
app/build.gradle
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@ -6,7 +6,7 @@ android {
applicationId "us.spotco.malwarescanner" applicationId "us.spotco.malwarescanner"
minSdkVersion 21 minSdkVersion 21
targetSdkVersion 26 targetSdkVersion 26
versionCode 26 versionCode 27
versionName "2.2" versionName "2.2"
} }
buildTypes { buildTypes {

8
app/src/main/java/us/spotco/malwarescanner/Database.java
View file

@ -103,7 +103,7 @@ class Database {
String line; String line;
while ((line = reader.readLine()) != null) { while ((line = reader.readLine()) != null) {
String[] lineS = line.split(":"); String[] lineS = line.split(":");
signaturesMD5.put(lineS[0], lineS[2]); signaturesMD5.put(lineS[0].substring(0, Utils.MAX_HASH_LENGTH), lineS[2]);
} }
reader.close(); reader.close();
} catch (Exception e) { } catch (Exception e) {
@ -116,9 +116,9 @@ class Database {
while ((line = reader.readLine()) != null) { while ((line = reader.readLine()) != null) {
String[] lineS = line.split(":"); String[] lineS = line.split(":");
if (lineS[0].length() == 32) { if (lineS[0].length() == 32) {
signaturesSHA1.put(lineS[0], lineS[2]); signaturesSHA1.put(lineS[0].substring(0, Utils.MAX_HASH_LENGTH), lineS[2]);
} else { } else {
signaturesSHA256.put(lineS[0], lineS[2]); signaturesSHA256.put(lineS[0].substring(0, Utils.MAX_HASH_LENGTH), lineS[2]);
} }
} }
reader.close(); reader.close();
@ -128,7 +128,7 @@ class Database {
} }
} }
} }
signaturesMD5.put("44d88612fea8a8f36de82e1278abb02f", "Eicar-Test-Signature"); signaturesMD5.put("44d88612fea8a8f36de82e1278abb02f".substring(0, Utils.MAX_HASH_LENGTH), "Eicar-Test-Signature");
System.gc(); System.gc();
} }
} }

6
app/src/main/java/us/spotco/malwarescanner/MalwareScanner.java
View file

@ -147,9 +147,9 @@ class MalwareScanner extends AsyncTask<Set<File>, Object, String> {
fis.close(); fis.close();
fileHashesMD5.put(String.format("%032x", new BigInteger(1, digestMD5.digest())), file); fileHashesMD5.put(String.format("%032x", new BigInteger(1, digestMD5.digest())).substring(0, Utils.MAX_HASH_LENGTH), file);
fileHashesSHA1.put(String.format("%032x", new BigInteger(1, digestSHA1.digest())), file); fileHashesSHA1.put(String.format("%032x", new BigInteger(1, digestSHA1.digest())).substring(0, Utils.MAX_HASH_LENGTH), file);
fileHashesSHA256.put(String.format("%064x", new BigInteger(1, digestSHA256.digest())), file); fileHashesSHA256.put(String.format("%064x", new BigInteger(1, digestSHA256.digest())).substring(0, Utils.MAX_HASH_LENGTH), file);
} catch (Exception e) { } catch (Exception e) {
e.printStackTrace(); e.printStackTrace();
} }

1
app/src/main/java/us/spotco/malwarescanner/Utils.java
View file

@ -16,6 +16,7 @@ class Utils {
public final static int MAX_SCAN_SIZE = (1000 * 1000) * 80; //80MB public final static int MAX_SCAN_SIZE = (1000 * 1000) * 80; //80MB
public final static int MAX_SCAN_SIZE_REALTIME = MAX_SCAN_SIZE / 2; //40MB public final static int MAX_SCAN_SIZE_REALTIME = MAX_SCAN_SIZE / 2; //40MB
public final static int MAX_HASH_LENGTH = 16;
public static int FILES_SCANNED = 0; public static int FILES_SCANNED = 0;
private static ThreadPoolExecutor threadPoolExecutor = null; private static ThreadPoolExecutor threadPoolExecutor = null;