Added a security provider for I2P-internal crypto

core/java/src/net/i2p/crypto/provider/I2PProvider.java

@@ -0,0 +1,37 @@
+package net.i2p.crypto.provider;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.security.Provider;
+
+public final class I2PProvider extends Provider {
+    public static String PROVIDER_NAME = "I2P";
+    private static String info = "I2P Security Provider v0.1, implementing" +
+            "several algorithms used by I2P.";
+
+    /**
+     * Construct a new provider.  This should only be required when
+     * using runtime registration of the provider using the
+     * <code>Security.addProvider()</code> mechanism.
+     */
+    public I2PProvider() {
+        super(PROVIDER_NAME, 0.1, info);
+
+        AccessController.doPrivileged(new PrivilegedAction<Void>() {
+            @Override
+            public Void run() {
+                setup();
+                return null;
+            }
+        });
+    }
+
+    private void setup() {
+        // TODO: Implement SPIs for existing code
+        //put("Cipher.AES", "net.i2p.crypto.provider.CipherSpi$aesCBC");
+        //put("Cipher.ElGamal", "net.i2p.crypto.provider.CipherSpi$elGamal");
+        //put("Mac.HmacMD5-I2P", "net.i2p.crypto.provider.MacSpi");
+        put("MessageDigest.SHA-1", "net.i2p.crypto.SHA1");
+        //put("Signature.SHA1withDSA", "net.i2p.crypto.provider.SignatureSpi");
+    }
+}