Add POWER8 GCM mode (GH #698)

Commit 3ed38e42f619 added the POWER8 infrastructure for GCM mode. It also added GCM_SetKeyWithoutResync_VMULL, GCM_Multiply_VMULL and GCM_Reduce_VMULL. This commit adds the remainder, which includes GCM_AuthenticateBlocks_VMULL.
GCC is OK on Linux (ppc64-le) and AIX (ppc64-be). We may need some touchups for XLC compiler

1 files changed, 4 insertions, 0 deletions

diff --git a/bench2.cpp b/bench2.cpp
index 2470399c..df1a813c 100644
--- a/bench2.cpp
+++ b/bench2.cpp
@@ -107,6 +107,10 @@ void Benchmark2(double t, double hertz)
 		if (HasPMULL())

 			BenchMarkByName2<AuthenticatedSymmetricCipher, MessageAuthenticationCode>("AES/GCM", 0, "GMAC(AES)");

 		else

+#elif CRYPTOPP_POWER8_VMULL_AVAILABLE

+		if (HasPMULL())

+			BenchMarkByName2<AuthenticatedSymmetricCipher, MessageAuthenticationCode>("AES/GCM", 0, "GMAC(AES)");

+		else

 #endif

 		{

 			BenchMarkByName2<AuthenticatedSymmetricCipher, MessageAuthenticationCode>("AES/GCM", 0, "GMAC(AES) (2K tables)", MakeParameters(Name::TableSize(), 2048));