From 9ad816a5d8d74105558640b2f37baec50d8b920f Mon Sep 17 00:00:00 2001
From: Matthias Gierlings <matthias.gierlings@hackmanit.de>
Date: Thu, 27 Oct 2016 19:00:23 +0200
Subject: Implements GMAC with GHASH.

Adds support for Galois Message Authentication Code calculation based on
GHASH, rather than GCM_Mode.
---
 src/lib/mac/mac.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/lib/mac/mac.cpp')

diff --git a/src/lib/mac/mac.cpp b/src/lib/mac/mac.cpp
index f2c5557c7..2fa321a67 100644
--- a/src/lib/mac/mac.cpp
+++ b/src/lib/mac/mac.cpp
@@ -45,6 +45,17 @@ MessageAuthenticationCode::create(const std::string& algo_spec,
    {
    const SCAN_Name req(algo_spec);
 
+#if defined(BOTAN_HAS_GMAC)
+   if(req.algo_name() == "GMAC" && req.arg_count() == 1)
+      {
+      if(provider.empty() || provider == "base")
+         {
+         if(auto bc = BlockCipher::create(req.arg(0)))
+            return std::unique_ptr<MessageAuthenticationCode>(new GMAC(bc.release()));
+         }
+      }
+#endif
+
 #if defined(BOTAN_HAS_HMAC)
    if(req.algo_name() == "HMAC" && req.arg_count() == 1)
       {
-- 
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