diff --git a/exntension.c b/exntension.c
deleted file mode 100644
index 99f1ca3..0000000
--- a/exntension.c
+++ /dev/null
@@ -1,40 +0,0 @@
-
-
-#include <openssl/x509v3.h>
-#include <string.h>
-
-const unsigned char * get_extention(X509 *x, int NID, int *data_len){
-    int loc;
-    ASN1_OCTET_STRING *octet_str;
-    long xlen;
-    int tag, xclass;
-
-    loc = X509_get_ext_by_NID( x, NID, -1);
-    X509_EXTENSION *ex = X509_get_ext(x, loc);
-    octet_str = X509_EXTENSION_get_data(ex);
-	*data_len = octet_str->length;
-    return octet_str->data;
-}
-
-// Copied from https://github.com/libtor/openssl/blob/master/demos/x509/mkcert.c#L153
-int add_custom_ext(X509 *cert, int nid,unsigned char *value, int len)
-{
-	X509_EXTENSION *ex;
-	ASN1_OCTET_STRING *os = ASN1_OCTET_STRING_new();
-	ASN1_OCTET_STRING_set(os,value,len);   
-	X509V3_CTX ctx;
-	/* This sets the 'context' of the extensions. */
-	/* No configuration database */
-	X509V3_set_ctx_nodb(&ctx);
-	/* Issuer and subject certs: both the target since it is self signed,
-	 * no request and no CRL
-	 */
-	X509V3_set_ctx(&ctx, cert, cert, NULL, NULL, 0);
-	// ref http://openssl.6102.n7.nabble.com/Adding-a-custom-extension-to-a-CSR-td47446.html
-	ex = X509_EXTENSION_create_by_NID( NULL, nid, 0, os); 
-	if (!X509_add_ext(cert,ex,-1))
-		return 0;
-
-	X509_EXTENSION_free(ex);
-	return 1;
-}
\ No newline at end of file