Add SM4 aarch64 asm support

CMakeLists.txt

@@ -302,6 +302,13 @@ if (ENABLE_SM4_AESNI_AVX)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native")
 endif()
 
+option(ENABLE_SM4_AARCH64 "Enable SM4 AARCH64 assembly implementation" OFF)
+if (ENABLE_SM4_AARCH64)
+	message(STATUS "ENABLE_SM4_AARCH64 is ON")
+	add_definitions(-DENABLE_SM4_AARCH64)
+	enable_language(ASM)
+	list(APPEND src src/sm4_aarch64.S)
+endif()
 
 option(ENABLE_SM4_ECB "Enable SM4 ECB mode" OFF)
 if (ENABLE_SM4_ECB)

src/sm4.c

@@ -1,4 +1,4 @@
-/*
+out/*
  *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
@@ -94,6 +94,7 @@ const uint8_t S[256] = {
 	 (S[((A))       & 0xff]))
 
 
+#ifndef ENABLE_SM4_AARCH64
 void sm4_set_encrypt_key(SM4_KEY *key, const uint8_t user_key[16])
 {
 	uint32_t X0, X1, X2, X3, X4;
@@ -171,3 +172,4 @@ void sm4_encrypt(const SM4_KEY *key, const unsigned char in[16], unsigned char o
 	PUTU32(out +  8, X1);
 	PUTU32(out + 12, X0);
 }
+#endif

src/sm4_tbox.c

@@ -161,6 +161,7 @@ const uint32_t T[256] = {
 	 (S[((A))       & 0xff]))
 
 
+#ifndef ENABLE_SM4_AARCH64
 void sm4_set_encrypt_key(SM4_KEY *key, const uint8_t user_key[16])
 {
 	uint32_t X0, X1, X2, X3, X4;
@@ -242,3 +243,4 @@ void sm4_encrypt(const SM4_KEY *key, const unsigned char in[16], unsigned char o
 	PUTU32(out +  8, X1);
 	PUTU32(out + 12, X0);
 }
+#endif