1 files changed, 114 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/jdk1.1/java/security/SecurityUtil.java b/libraries/spongycastle/core/src/main/jdk1.1/java/security/SecurityUtil.java
new file mode 100644
index 000000000..13c313cf6
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/jdk1.1/java/security/SecurityUtil.java
@@ -0,0 +1,114 @@
+package java.security;
+
+
+class SecurityUtil
+{
+    static class Implementation
+    {
+        Object      engine;
+        Provider    provider;
+
+        Implementation(
+            Object      engine,
+            Provider    provider)
+        {
+            this.engine = engine;
+            this.provider = provider;
+        }
+
+        Object getEngine()
+        {
+            return engine;
+        }
+
+        Provider getProvider()
+        {
+            return provider;
+        }
+    }
+
+    /**
+     * see if we can find an algorithm (or its alias and what it represents) in
+     * the property table for the given provider.
+     *
+     * @return null if no algorithm found, an Implementation if it is.
+     */
+    static private Implementation getImplementation(
+        String      baseName,
+        String      algorithm,
+        Provider    prov)
+    {
+        String      alias;
+
+        while ((alias = prov.getProperty("Alg.Alias." + baseName + "." + algorithm)) != null)
+        {
+            algorithm = alias;
+        }
+
+        String      className = prov.getProperty(baseName + "." + algorithm);
+
+        if (className != null)
+        {
+            try
+            {
+                return new Implementation(Class.forName(className).newInstance(), prov);
+            }
+            catch (ClassNotFoundException e)
+            {
+                throw new IllegalStateException(
+                    "algorithm " + algorithm + " in provider " + prov.getName() + " but no class found!");
+            }
+            catch (Exception e)
+            {
+                throw new IllegalStateException(
+                    "algorithm " + algorithm + " in provider " + prov.getName() + " but class inaccessible!");
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * return an implementation for a given algorithm/provider.
+     * If the provider is null, we grab the first avalaible who has the required algorithm.
+     *
+     * @return null if no algorithm found, an Implementation if it is.
+     * @exception NoSuchProviderException if a provider is specified and not found.
+     */
+    static Implementation getImplementation(
+        String      baseName,
+        String      algorithm,
+        String      provider)
+        throws NoSuchProviderException
+    {
+        if (provider == null)
+        {
+            Provider[] prov = Security.getProviders();
+
+            //
+            // search every provider looking for the algorithm we want.
+            //
+            for (int i = 0; i != prov.length; i++)
+            {
+                Implementation imp = getImplementation(baseName, algorithm, prov[i]);
+                if (imp != null)
+                {
+                    return imp;
+                }
+            }
+        }
+        else
+        {
+            Provider prov = Security.getProvider(provider);
+
+            if (prov == null)
+            {
+                throw new NoSuchProviderException("Provider " + provider + " not found");
+            }
+
+            return getImplementation(baseName, algorithm, prov);
+        }
+
+        return null;
+    }
+}