From bd65271ce7bc4ffe28eebe16bf16796b18b9c424 Mon Sep 17 00:00:00 2001
From: Ioannis Canellos <iocanel@apache.org>
Date: Fri, 18 Nov 2011 17:18:52 +0200
Subject: [PATCH] Added a check for JCE providers that are not working.

---
 .../org/jclouds/encryption/internal/JCECrypto.java  | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/org/jclouds/encryption/internal/JCECrypto.java b/core/src/main/java/org/jclouds/encryption/internal/JCECrypto.java
index 9b539b94ec..4efa54abe0 100644
--- a/core/src/main/java/org/jclouds/encryption/internal/JCECrypto.java
+++ b/core/src/main/java/org/jclouds/encryption/internal/JCECrypto.java
@@ -63,7 +63,18 @@ public class JCECrypto implements Crypto {
 
    @Override
    public Mac hmac(String algorithm, byte[] key) throws NoSuchAlgorithmException, InvalidKeyException {
-      Mac mac = provider == null ? Mac.getInstance(algorithm) : Mac.getInstance(algorithm, provider);
+      Mac mac = null;
+      if(provider != null) {
+          try {
+          mac = Mac.getInstance(algorithm, provider);
+          } catch(Exception e) {
+              //Provider does not function.
+              //Do nothing and let it fallback to the default way.
+          }
+      }
+      if(mac == null) {
+         mac = Mac.getInstance(algorithm);
+      }
       SecretKeySpec signingKey = new SecretKeySpec(key, algorithm);
       mac.init(signingKey);
       return mac;