Add CalculateMac utility method

1 files changed, 8 insertions, 0 deletions

diff --git a/crypto/src/security/MacUtilities.cs b/crypto/src/security/MacUtilities.cs

index d1f8c89b4..d7fe91142 100644
--- a/crypto/src/security/MacUtilities.cs
+++ b/crypto/src/security/MacUtilities.cs
@@ -230,6 +230,14 @@ namespace Org.BouncyCastle.Security
             return (string) algorithms[oid.Id];
         }
 
+        public static byte[] CalculateMac(string algorithm, ICipherParameters cp, byte[] input)
+        {
+            IMac mac = GetMac(algorithm);
+            mac.Init(cp);
+            mac.BlockUpdate(input, 0, input.Length);
+            return DoFinal(mac);
+        }
+
         public static byte[] DoFinal(IMac mac)
         {
             byte[] b = new byte[mac.GetMacSize()];