Make AES optional and remove "Public API" from headers

CMakeLists.txt

@@ -25,8 +25,6 @@ set(src
 	src/sm9_lib.c
 	src/zuc.c
 	src/zuc_modes.c
-	src/aes.c
-	src/aes_modes.c
 	src/hash_drbg.c
 	src/block_cipher.c
 	src/digest.c
@@ -123,7 +121,6 @@ set(tests
 	sm2
 	sm9
 	zuc
-	aes
 	hash_drbg
 	block_cipher
 	digest
@@ -304,6 +301,14 @@ if (ENABLE_SHA2)
 endif()
 
 
+option(ENABLE_AES "Enable AES" ON)
+if (ENABLE_AES)
+	message(STATUS "ENABLE_AES is ON")
+	list(APPEND src src/aes.c src/aes_modes.c)
+	list(APPEND tests aes)
+endif()
+
+
 option(ENABLE_CHACHA20 "Enable Chacha20" OFF)
 if (ENABLE_CHACHA20)
 	message(STATUS "ENABLE_CHACHA20 is ON")