Add testSHA1 Utils method

app/src/main/java/fr/free/nrw/commons/Utils.java

@@ -3,6 +3,7 @@ package fr.free.nrw.commons;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Build;
+import android.util.Log;
 
 import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.assist.ImageScaleType;
@@ -16,10 +17,16 @@ import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 
 import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.StringWriter;
 import java.io.UnsupportedEncodingException;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
@@ -32,8 +39,56 @@ import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.TransformerFactoryConfigurationError;
 
+import fr.free.nrw.commons.upload.ShareActivity;
+
 public class Utils {
 
+    private static final String TAG = Utils.class.getName();
+
+    public static boolean testSHA1(String sha1, File file) {
+        MessageDigest digest;
+        try {
+            digest = MessageDigest.getInstance("SHA1");
+        } catch (NoSuchAlgorithmException e) {
+            Log.e(TAG, "Exception while getting Digest", e);
+            return false;
+        }
+
+        InputStream is;
+        try {
+            is = new FileInputStream(file);
+        } catch (FileNotFoundException e) {
+            Log.e(TAG, "Exception while getting FileInputStream", e);
+            return false;
+        }
+
+        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 40 chars
+            output = String.format("%40s", output).replace(' ', '0');
+
+            Log.i(TAG, "Test: " + sha1);
+            Log.i(TAG, "Generated: " + output);
+
+            return (sha1.equals(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);
+            }
+        }
+    }
+
     public static Date parseMWDate(String mwDate) {
         SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); // Assuming MW always gives me UTC
         try {

app/src/main/java/fr/free/nrw/commons/upload/ShareActivity.java

@@ -24,6 +24,7 @@ import com.nostra13.universalimageloader.core.ImageLoader;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.List;