Throw a better error message if EdDSA test vectors not found

Author: str4d

test/net/i2p/crypto/eddsa/math/PrecomputationTestVectors.java

@@ -2,6 +2,7 @@
 
 import java.io.BufferedReader;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
 
 import net.i2p.crypto.eddsa.Utils;
@@ -22,8 +23,10 @@ public static GroupElement[][] getPrecomputation(String fileName) {
         BufferedReader file = null;
         int row = 0, col = 0;
         try {
-            file = new BufferedReader(new InputStreamReader(
-                    PrecomputationTestVectors.class.getResourceAsStream(fileName)));
+            InputStream is = PrecomputationTestVectors.class.getResourceAsStream(fileName);
+            if (is == null)
+                throw new IOException("Resource not found: " + fileName);
+            file = new BufferedReader(new InputStreamReader(is));
             String line;
             while ((line = file.readLine()) != null) {
                 if (line.equals(" },"))