Abstracted the error message thrown

Author: poovamraj

lib/src/main/java/com/auth0/jwt/algorithms/ECDSAAlgorithm.java

@@ -158,23 +158,23 @@ void validateSignatureStructure(byte[] joseSignature, ECPublicKey publicKey) thr
         }
 
         if (isAllZeros(joseSignature)) {
-            throw new SignatureException("Invalid Signature: All Zeros.");
+            throw new SignatureException("Invalid signature format.");
         }
 
         // get R
         byte[] rBytes = new byte[ecNumberSize];
         System.arraycopy(joseSignature, 0, rBytes, 0, ecNumberSize);
         BigInteger r = new BigInteger(1, rBytes);
         if(isAllZeros(rBytes)) {
-            throw new SignatureException("Invalid Signature: All Zeros for R value.");
+            throw new SignatureException("Invalid signature format.");
         }
 
         // get S
         byte[] sBytes = new byte[ecNumberSize];
         System.arraycopy(joseSignature, ecNumberSize, sBytes, 0, ecNumberSize);
         BigInteger s = new BigInteger(1, sBytes);
         if(isAllZeros(sBytes)) {
-            throw new SignatureException("Invalid Signature: All Zeros for S value.");
+            throw new SignatureException("Invalid signature format.");
         }
 
         //moved this check from JOSEToDER method
@@ -192,11 +192,11 @@ void validateSignatureStructure(byte[] joseSignature, ECPublicKey publicKey) thr
 
         // R and S must be less than N
         if (order.compareTo(r) < 1) {
-            throw new SignatureException("The difference between R value and order should be greater than one.");
+            throw new SignatureException("Invalid signature format.");
         }
 
         if (order.compareTo(s) < 1){
-            throw new SignatureException("The difference between S value and order should be greater than one.");
+            throw new SignatureException("Invalid signature format.");
         }
     }
 

lib/src/test/java/com/auth0/jwt/algorithms/ECDSAAlgorithmTest.java

@@ -1370,7 +1370,7 @@ public void emptyECDSA256SignatureShouldFailTokenVerification() throws Exception
     @Test
     public void signatureWithAllZerosShouldFail() throws Exception {
         exception.expect(SignatureException.class);
-        exception.expectMessage("Invalid Signature: All Zeros.");
+        exception.expectMessage("Invalid signature format.");
 
         ECPublicKey pubKey = (ECPublicKey) readPublicKeyFromFile(PUBLIC_KEY_FILE_256, "EC");
 
@@ -1382,7 +1382,7 @@ public void signatureWithAllZerosShouldFail() throws Exception {
     @Test
     public void signatureWithRZeroShouldFail() throws Exception {
         exception.expect(SignatureException.class);
-        exception.expectMessage("Invalid Signature: All Zeros for R value.");
+        exception.expectMessage("Invalid signature format.");
 
         ECPublicKey publicKey = (ECPublicKey) readPublicKeyFromFile(PUBLIC_KEY_FILE_256, "EC");
         ECPrivateKey privateKey = (ECPrivateKey) readPrivateKeyFromFile(PRIVATE_KEY_FILE_256, "EC");
@@ -1408,7 +1408,7 @@ public void signatureWithRZeroShouldFail() throws Exception {
     @Test
     public void signatureWithSZeroShouldFail() throws Exception {
         exception.expect(SignatureException.class);
-        exception.expectMessage("Invalid Signature: All Zeros for S value.");
+        exception.expectMessage("Invalid signature format.");
 
         ECPublicKey publicKey = (ECPublicKey) readPublicKeyFromFile(PUBLIC_KEY_FILE_256, "EC");
         ECPrivateKey privateKey = (ECPrivateKey) readPrivateKeyFromFile(PRIVATE_KEY_FILE_256, "EC");
@@ -1434,7 +1434,7 @@ public void signatureWithSZeroShouldFail() throws Exception {
     @Test
     public void signatureWithRValueNotLessThanOrderShouldFail() throws Exception {
         exception.expect(SignatureException.class);
-        exception.expectMessage("The difference between R value and order should be greater than one.");
+        exception.expectMessage("Invalid signature format.");
 
         ECPublicKey publicKey = (ECPublicKey) readPublicKeyFromFile(PUBLIC_KEY_FILE_256, "EC");
         ECPrivateKey privateKey = (ECPrivateKey) readPrivateKeyFromFile(PRIVATE_KEY_FILE_256, "EC");
@@ -1452,7 +1452,7 @@ public void signatureWithRValueNotLessThanOrderShouldFail() throws Exception {
     @Test
     public void signatureWithSValueNotLessThanOrderShouldFail() throws Exception {
         exception.expect(SignatureException.class);
-        exception.expectMessage("The difference between S value and order should be greater than one.");
+        exception.expectMessage("Invalid signature format.");
 
         ECPublicKey publicKey = (ECPublicKey) readPublicKeyFromFile(PUBLIC_KEY_FILE_256, "EC");
         ECPrivateKey privateKey = (ECPrivateKey) readPrivateKeyFromFile(PRIVATE_KEY_FILE_256, "EC");