From b48a14a985f9bef9e0b5ea2260bfc33aa6148480 Mon Sep 17 00:00:00 2001
From: Jack Lloyd <jack@randombit.net>
Date: Mon, 9 Jul 2018 20:09:12 -0400
Subject: Add support for ARMv8 SM4 instructions

Tested in qemu
---
 src/lib/block/sm4/sm4.cpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'src/lib/block/sm4/sm4.cpp')

diff --git a/src/lib/block/sm4/sm4.cpp b/src/lib/block/sm4/sm4.cpp
index 7c409d40f..7a370a67b 100644
--- a/src/lib/block/sm4/sm4.cpp
+++ b/src/lib/block/sm4/sm4.cpp
@@ -1,12 +1,14 @@
 /*
 * SM4
 * (C) 2017 Ribose Inc
+* (C) 2018 Jack Lloyd
 *
 * Botan is released under the Simplified BSD License (see license.txt)
 */
 
 #include <botan/sm4.h>
 #include <botan/loadstor.h>
+#include <botan/cpuid.h>
 
 namespace Botan {
 
@@ -126,6 +128,11 @@ void SM4::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
    {
    verify_key_set(m_RK.empty() == false);
 
+#if defined(BOTAN_HAS_SM4_ARMV8)
+   if(CPUID::has_arm_sm4())
+      return sm4_armv8_encrypt(in, out, blocks);
+#endif
+
    for(size_t i = 0; i != blocks; ++i)
       {
       uint32_t B0 = load_be<uint32_t>(in, 0);
@@ -156,6 +163,11 @@ void SM4::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
    {
    verify_key_set(m_RK.empty() == false);
 
+#if defined(BOTAN_HAS_SM4_ARMV8)
+   if(CPUID::has_arm_sm4())
+      return sm4_armv8_decrypt(in, out, blocks);
+#endif
+
    for(size_t i = 0; i != blocks; ++i)
       {
       uint32_t B0 = load_be<uint32_t>(in, 0);
@@ -219,4 +231,28 @@ void SM4::clear()
    zap(m_RK);
    }
 
+size_t SM4::parallelism() const
+   {
+#if defined(BOTAN_HAS_SM4_ARMV8)
+   if(CPUID::has_arm_sm4())
+      {
+      return 4;
+      }
+#endif
+
+   return 1;
+   }
+
+std::string SM4::provider() const
+   {
+#if defined(BOTAN_HAS_SM4_ARMV8)
+   if(CPUID::has_arm_sm4())
+      {
+      return "armv8";
+      }
+#endif
+
+   return "base";
+   }
+
 }
-- 
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