From ba5a4d78782c981e6e955444281a7867dd7292de Mon Sep 17 00:00:00 2001
From: Casey Marshall <csm@gnu.org>
Date: Sat, 3 Jun 2006 07:36:50 +0000
Subject: 2006-06-03  Casey Marshall  <csm@gnu.org>

	* javax/crypto/Mac.java (update): new method.
	* javax/crypto/MacSpi.java (engineUpdate): new method.
---
 javax/crypto/Mac.java    | 13 +++++++++++++
 javax/crypto/MacSpi.java | 18 ++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/javax/crypto/Mac.java b/javax/crypto/Mac.java
index abbff8b23..055b20a4f 100644
--- a/javax/crypto/Mac.java
+++ b/javax/crypto/Mac.java
@@ -41,6 +41,7 @@ package javax.crypto;
 import gnu.java.security.Engine;
 
 import java.lang.reflect.InvocationTargetException;
+import java.nio.ByteBuffer;
 import java.security.InvalidAlgorithmParameterException;
 import java.security.InvalidKeyException;
 import java.security.Key;
@@ -397,6 +398,18 @@ public class Mac implements Cloneable
     macSpi.engineUpdate(input, offset, length);
   }
 
+  /**
+   * Update this MAC with the remaining bytes in the given buffer
+   * @param buffer The input buffer.
+   * @since 1.5
+   */
+  public final void update (final ByteBuffer buffer)
+  {
+    if (virgin)
+      throw new IllegalStateException ("not initialized");
+    macSpi.engineUpdate(buffer);
+  }
+  
   /**
    * Clone this instance, if the underlying implementation supports it.
    *
diff --git a/javax/crypto/MacSpi.java b/javax/crypto/MacSpi.java
index b0f96bff3..853bd66aa 100644
--- a/javax/crypto/MacSpi.java
+++ b/javax/crypto/MacSpi.java
@@ -38,6 +38,7 @@ exception statement from your version. */
 
 package javax.crypto;
 
+import java.nio.ByteBuffer;
 import java.security.InvalidAlgorithmParameterException;
 import java.security.InvalidKeyException;
 import java.security.Key;
@@ -142,4 +143,21 @@ public abstract class MacSpi
    * @param length The number of bytes to update.
    */
   protected abstract void engineUpdate(byte[] input, int offset, int length);
+  
+  /**
+   * Update this MAC with the remaining bytes of a buffer.
+   * 
+   * @param buffer The input buffer.
+   * @since 1.5
+   */
+  protected void engineUpdate (final ByteBuffer buffer)
+  {
+    byte[] buf = new byte[1024];
+    while (buffer.hasRemaining ())
+      {
+        int n = Math.min (buffer.remaining (), buf.length);
+        buffer.get (buf, 0, n);
+        engineUpdate (buf, 0, n);
+      }
+  }
 }
-- 
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