diff --git a/CMakeLists.txt b/CMakeLists.txt
index c9ce99d..cecaafe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,7 +46,6 @@ endif()
 
 add_definitions(-DLIBRESSL_INTERNAL)
 add_definitions(-DOPENSSL_NO_HW_PADLOCK)
-add_definitions(-DOPENSSL_NO_ASM)
 
 set(CMAKE_POSITION_INDEPENDENT_CODE true)
 
@@ -182,6 +181,14 @@ if(HAVE_ERR_H)
 	add_definitions(-DHAVE_ERR_H)
 endif()
 
+if("${CMAKE_C_COMPILER_ABI}" STREQUAL "ELF" AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64" AND ENABLE_ASM)
+	set(HOST_ASM_ELF_X86_64 true)
+endif()
+
+if(APPLE AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64" AND ENABLE_ASM)
+	set(HOST_ASM_MACOSX_X86_64 true)
+endif()
+
 set(OPENSSL_LIBS ssl crypto)
 if(CMAKE_HOST_WIN32)
 	set(OPENSSL_LIBS ${OPENSSL_LIBS} ws2_32)
diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 24c6821..4086168 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -8,16 +8,107 @@ include_directories(
 	modes
 )
 
+if(HOST_ASM_ELF_X86_64)
+	set(
+		ASM_X86_64_ELF_SRC
+		aes/aes-elf-x86_64.s
+		aes/bsaes-elf-x86_64.s
+		aes/vpaes-elf-x86_64.s
+		aes/aesni-elf-x86_64.s
+		aes/aesni-sha1-elf-x86_64.s
+		bn/modexp512-elf-x86_64.s
+		bn/mont-elf-x86_64.s
+		bn/mont5-elf-x86_64.s
+		bn/gf2m-elf-x86_64.s
+		camellia/cmll-elf-x86_64.s
+		md5/md5-elf-x86_64.s
+		modes/ghash-elf-x86_64.s
+		rc4/rc4-elf-x86_64.s
+		rc4/rc4-md5-elf-x86_64.s
+		sha/sha1-elf-x86_64.s
+		sha/sha256-elf-x86_64.S
+		sha/sha512-elf-x86_64.S
+		whrlpool/wp-elf-x86_64.s
+		cpuid-elf-x86_64.S
+	)
+	add_definitions(-DAES_ASM)
+	add_definitions(-DBSAES_ASM)
+	add_definitions(-DVPAES_ASM)
+	add_definitions(-DOPENSSL_IA32_SSE2)
+	add_definitions(-DOPENSSL_BN_ASM_MONT)
+	add_definitions(-DOPENSSL_BN_ASM_MONT5)
+	add_definitions(-DOPENSSL_BN_ASM_GF2m)
+	add_definitions(-DMD5_ASM)
+	add_definitions(-DGHASH_ASM)
+	add_definitions(-DRSA_ASM)
+	add_definitions(-DSHA1_ASM)
+	add_definitions(-DSHA256_ASM)
+	add_definitions(-DSHA512_ASM)
+	add_definitions(-DWHIRLPOOL_ASM)
+	add_definitions(-DOPENSSL_CPUID_OBJ)
+	set(CRYPTO_SRC ${CRYPTO_SRC} ${ASM_X86_64_ELF_SRC})
+	set_property(SOURCE ${ASM_X86_64_ELF_SRC} PROPERTY LANGUAGE C)
+endif()
+
+if(HOST_ASM_MACOSX_X86_64)
+	set(
+		ASM_X86_64_MACOSX_SRC
+		aes/aes-macosx-x86_64.s
+		aes/bsaes-macosx-x86_64.s
+		aes/vpaes-macosx-x86_64.s
+		aes/aesni-macosx-x86_64.s
+		aes/aesni-sha1-macosx-x86_64.s
+		bn/modexp512-macosx-x86_64.s
+		bn/mont-macosx-x86_64.s
+		bn/mont5-macosx-x86_64.s
+		bn/gf2m-macosx-x86_64.s
+		camellia/cmll-macosx-x86_64.s
+		md5/md5-macosx-x86_64.s
+		modes/ghash-macosx-x86_64.s
+		rc4/rc4-macosx-x86_64.s
+		rc4/rc4-md5-macosx-x86_64.s
+		sha/sha1-macosx-x86_64.s
+		sha/sha256-macosx-x86_64.S
+		sha/sha512-macosx-x86_64.S
+		whrlpool/wp-macosx-x86_64.s
+		cpuid-macosx-x86_64.S
+	)
+	add_definitions(-DAES_ASM)
+	add_definitions(-DBSAES_ASM)
+	add_definitions(-DVPAES_ASM)
+	add_definitions(-DOPENSSL_IA32_SSE2)
+	add_definitions(-DOPENSSL_BN_ASM_MONT)
+	add_definitions(-DOPENSSL_BN_ASM_MONT5)
+	add_definitions(-DOPENSSL_BN_ASM_GF2m)
+	add_definitions(-DMD5_ASM)
+	add_definitions(-DGHASH_ASM)
+	add_definitions(-DRSA_ASM)
+	add_definitions(-DSHA1_ASM)
+	add_definitions(-DSHA256_ASM)
+	add_definitions(-DSHA512_ASM)
+	add_definitions(-DWHIRLPOOL_ASM)
+	add_definitions(-DOPENSSL_CPUID_OBJ)
+	set(CRYPTO_SRC ${CRYPTO_SRC} ${ASM_X86_64_MACOSX_SRC})
+	set_property(SOURCE ${ASM_X86_64_MACOSX_SRC} PROPERTY LANGUAGE C)
+endif()
+
+if((NOT HOST_ASM_ELF_X86_64) AND (NOT HOST_ASM_MACOSX_X86_64))
+	set(
+		CRYPTO_SRC
+		${CRYPTO_SRC}
+		aes/aes_cbc.c
+		aes/aes_core.c
+		camellia/camellia.c
+		camellia/cmll_cbc.c
+		rc4/rc4_enc.c
+		rc4/rc4_skey.c
+		whrlpool/wp_block.c
+	)
+endif()
+
 set(
 	CRYPTO_SRC
-
-	aes/aes_cbc.c
-	aes/aes_core.c
-	camellia/camellia.c
-	camellia/cmll_cbc.c
-	rc4/rc4_enc.c
-	rc4/rc4_skey.c
-	whrlpool/wp_block.c
+	${CRYPTO_SRC}
 	cpt_err.c
 	cryptlib.c
 	cversion.c
@@ -643,6 +734,14 @@ if(NOT HAVE_TIMINGSAFE_MEMCMP)
 	set(CRYPTO_SRC ${CRYPTO_SRC} compat/timingsafe_memcmp.c)
 endif()
 
+if(NOT ENABLE_ASM)
+	add_definitions(-DOPENSSL_NO_ASM)
+else()
+	if(CMAKE_HOST_WIN32)
+		add_definitions(-DOPENSSL_NO_ASM)
+	endif()
+endif()
+
 if (BUILD_SHARED)
 	add_library(crypto-objects OBJECT ${CRYPTO_SRC})
 	add_library(crypto STATIC $<TARGET_OBJECTS:crypto-objects>)