增加编译控制选项

src/aes.c

@@ -47,6 +47,7 @@
  */
 
 
+#ifndef NO_AES
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -478,3 +479,4 @@ void aes_decrypt(const AES_KEY *aes_key, const uint8_t in[16], uint8_t out[16])
 
 	memset(state, 0, sizeof(state));
 }
+#endif

src/chacha20.c

@@ -46,6 +46,7 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef NO_CHACHA20
 
 #include <stdio.h>
 #include <string.h>
@@ -121,3 +122,4 @@ void chacha20_generate_keystream(CHACHA20_STATE *state, unsigned int counts, uns
 		state->d[12]++;
 	}
 }
+#endif

src/des.c

@@ -46,6 +46,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef NO_DES
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -265,3 +267,4 @@ void des_encrypt(DES_KEY *key, const unsigned char in[DES_BLOCK_SIZE],
 
 	PUTU64(out, T);
 }
+#endif

src/rc4.c

@@ -45,10 +45,13 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+#ifndef NO_RC4
 
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+
+
 #include <gmssl/rc4.h>
 
 void rc4_set_key(RC4_STATE *state, const unsigned char *key, size_t keylen)
@@ -115,3 +118,5 @@ unsigned char rc4_generate_keybyte(RC4_STATE *state)
 	rc4_generate_keystream(state, 1, out);
 	return out[0];
 }
+
+#endif