diff --git a/go/certificate.go b/go/certificate.go
index 0c4464da..b37f8053 100644
--- a/go/certificate.go
+++ b/go/certificate.go
@@ -1,2 +1,20 @@
 /* +build cgo */
 package gmssl
+
+/*
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+*/
+import "C"
+
+import (
+	"errors"
+)
+
+func GetAttributesFromCertificate(cert string) (map[string]string, error) {
+	return nil, errors.New("Not implemented")
+}
+
+func GetPublicKeyFromCertificate(cert string) (*PublicKey, error) {
+	return nil, errors.New("Not implemented")
+}
diff --git a/go/engine.go b/go/engine.go
index 0c4464da..1cf8f8bc 100644
--- a/go/engine.go
+++ b/go/engine.go
@@ -1,2 +1,39 @@
 /* +build cgo */
 package gmssl
+
+/*
+#include <openssl/engine.h>
+*/
+import "C"
+
+import (
+	"errors"
+)
+
+func GetEngineNames() []string {
+	return []string{"skf", "sdf"}
+}
+
+type Engine struct {
+	engine *C.ENGINE
+}
+
+func OpenEngine(name string, args map[string]string) (*Engine, error) {
+	return nil, errors.New("Not implemented")
+}
+
+func (eng *Engine) ExecuteCommand(cmd_name string, arg string, optinal bool) (string, error) {
+	return "", errors.New("Not implemented")
+}
+
+func (eng *Engine) LoadPrivateKey(key_id string, args map[string]string) (*PrivateKey, error) {
+	return nil, errors.New("Not implemented")
+}
+
+func (eng *Engine) LoadPublicKey(key_id string, args map[string]string) (*PublicKey, error) {
+	return nil, errors.New("Not implemented")
+}
+
+func (eng *Engine) LoadCertificate(ca_dn []string, args map[string]string) (string, error) {
+	return "", errors.New("Not implemented")
+}
diff --git a/go/kdf.go b/go/kdf.go
deleted file mode 100644
index 0c4464da..00000000
--- a/go/kdf.go
+++ /dev/null
@@ -1,2 +0,0 @@
-/* +build cgo */
-package gmssl
diff --git a/go/pbkdf.go b/go/pbkdf.go
new file mode 100644
index 00000000..bd360679
--- /dev/null
+++ b/go/pbkdf.go
@@ -0,0 +1,21 @@
+/* +build cgo */
+package gmssl
+
+/*
+#include <openssl/evp.h>
+*/
+import "C"
+
+import (
+	"errors"
+)
+
+func GetKeyDeriveFunctions(aliases bool) []string {
+	return []string{"PBKDF2v1", "PBKDFv2", "scrypt"}
+}
+
+func DeriveKeyFromPassword(scheme string, args map[string]string, password string, salt []byte) ([]byte, error) {
+	return nil, errors.New("Not implemented")
+}
+
+
diff --git a/go/pkey.go b/go/pkey.go
index 7b154cb9..969e3d32 100644
--- a/go/pkey.go
+++ b/go/pkey.go
@@ -130,5 +130,20 @@ func (pkey *PublicKey) Verify(scheme string, args map[string]string, data, signa
 }
 
 func (pkey *PrivateKey) DeriveKey(scheme string, args map[string]string, publicKey PublicKey) ([]byte, error) {
+	ctx := C.EVP_PKEY_CTX_new(pkey.pkey, nil)
+	if ctx == nil {
+		return nil, errors.New("Failure")
+	}
+	if 1 != C.EVP_PKEY_derive_init(ctx) {
+	}
+	/*
+	if 1 != C.EVP_PKEY_derive_set_peer(ctx, PublicKey.pkey) {
+	}
+	*/
+
+	outbuf := make([]byte, C.EVP_PKEY_size(pkey.pkey))
+	outlen := C.size_t(len(outbuf))
+	if 1 != C.EVP_PKEY_derive(ctx, (*C.uchar)(&outbuf[0]), &outlen) {
+	}
 	return nil, errors.New("Not implemented")
 }