diff --git a/include/libssh/keys.h b/include/libssh/keys.h
index e025b240..4a9f9ab1 100644
--- a/include/libssh/keys.h
+++ b/include/libssh/keys.h
@@ -81,6 +81,5 @@ ssh_string ssh_do_sign_with_agent(struct ssh_session_struct *session,
 ssh_string ssh_do_sign(ssh_session session,ssh_buffer sigbuf,
         ssh_private_key privatekey);
 ssh_string ssh_sign_session_id(ssh_session session, ssh_private_key privatekey);
-ssh_string ssh_encrypt_rsa1(ssh_session session, ssh_string data, ssh_public_key key);
 
 #endif /* KEYS_H_ */
diff --git a/src/kex.c b/src/kex.c
index 21f2cad6..ee0d5824 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -570,6 +570,72 @@ static int modulus_smaller(ssh_public_key k1, ssh_public_key k2){
     
 }
 
+static ssh_string ssh_encrypt_rsa1(ssh_session session,
+                                   ssh_string data,
+                                   ssh_public_key key) {
+  ssh_string str = NULL;
+  size_t len = ssh_string_len(data);
+  size_t size = 0;
+#ifdef HAVE_LIBGCRYPT
+  const char *tmp = NULL;
+  gcry_sexp_t ret_sexp;
+  gcry_sexp_t data_sexp;
+
+  if (gcry_sexp_build(&data_sexp, NULL, "(data(flags pkcs1)(value %b))",
+      len, ssh_string_data(data))) {
+    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
+    return NULL;
+  }
+  if (gcry_pk_encrypt(&ret_sexp, data_sexp, key->rsa_pub)) {
+    gcry_sexp_release(data_sexp);
+    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
+    return NULL;
+  }
+
+  gcry_sexp_release(data_sexp);
+
+  data_sexp = gcry_sexp_find_token(ret_sexp, "a", 0);
+  if (data_sexp == NULL) {
+    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
+    gcry_sexp_release(ret_sexp);
+    return NULL;
+  }
+  tmp = gcry_sexp_nth_data(data_sexp, 1, &size);
+  if (*tmp == 0) {
+    size--;
+    tmp++;
+  }
+
+  str = ssh_string_new(size);
+  if (str == NULL) {
+    ssh_set_error(session, SSH_FATAL, "Not enough space");
+    gcry_sexp_release(data_sexp);
+    gcry_sexp_release(ret_sexp);
+    return NULL;
+  }
+  ssh_string_fill(str, tmp, size);
+
+  gcry_sexp_release(data_sexp);
+  gcry_sexp_release(ret_sexp);
+#elif defined HAVE_LIBCRYPTO
+  size = RSA_size(key->rsa_pub);
+
+  str = ssh_string_new(size);
+  if (str == NULL) {
+    ssh_set_error(session, SSH_FATAL, "Not enough space");
+    return NULL;
+  }
+
+  if (RSA_public_encrypt(len, ssh_string_data(data), ssh_string_data(str), key->rsa_pub,
+      RSA_PKCS1_PADDING) < 0) {
+    ssh_string_free(str);
+    return NULL;
+  }
+#endif
+
+  return str;
+}
+
 #define ABS(A) ( (A)<0 ? -(A):(A) )
 static ssh_string encrypt_session_key(ssh_session session, ssh_public_key srvkey,
     ssh_public_key hostkey, int slen, int hlen) {
diff --git a/src/keys.c b/src/keys.c
index f4e8e2ca..eb141691 100644
--- a/src/keys.c
+++ b/src/keys.c
@@ -484,70 +484,6 @@ ssh_string ssh_do_sign(ssh_session session, ssh_buffer sigbuf,
   return signature;
 }
 
-ssh_string ssh_encrypt_rsa1(ssh_session session, ssh_string data, ssh_public_key key) {
-  ssh_string str = NULL;
-  size_t len = ssh_string_len(data);
-  size_t size = 0;
-#ifdef HAVE_LIBGCRYPT
-  const char *tmp = NULL;
-  gcry_sexp_t ret_sexp;
-  gcry_sexp_t data_sexp;
-
-  if (gcry_sexp_build(&data_sexp, NULL, "(data(flags pkcs1)(value %b))",
-      len, ssh_string_data(data))) {
-    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
-    return NULL;
-  }
-  if (gcry_pk_encrypt(&ret_sexp, data_sexp, key->rsa_pub)) {
-    gcry_sexp_release(data_sexp);
-    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
-    return NULL;
-  }
-
-  gcry_sexp_release(data_sexp);
-
-  data_sexp = gcry_sexp_find_token(ret_sexp, "a", 0);
-  if (data_sexp == NULL) {
-    ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
-    gcry_sexp_release(ret_sexp);
-    return NULL;
-  }
-  tmp = gcry_sexp_nth_data(data_sexp, 1, &size);
-  if (*tmp == 0) {
-    size--;
-    tmp++;
-  }
-
-  str = ssh_string_new(size);
-  if (str == NULL) {
-    ssh_set_error(session, SSH_FATAL, "Not enough space");
-    gcry_sexp_release(data_sexp);
-    gcry_sexp_release(ret_sexp);
-    return NULL;
-  }
-  ssh_string_fill(str, tmp, size);
-
-  gcry_sexp_release(data_sexp);
-  gcry_sexp_release(ret_sexp);
-#elif defined HAVE_LIBCRYPTO
-  size = RSA_size(key->rsa_pub);
-
-  str = ssh_string_new(size);
-  if (str == NULL) {
-    ssh_set_error(session, SSH_FATAL, "Not enough space");
-    return NULL;
-  }
-
-  if (RSA_public_encrypt(len, ssh_string_data(data), ssh_string_data(str), key->rsa_pub,
-      RSA_PKCS1_PADDING) < 0) {
-    ssh_string_free(str);
-    return NULL;
-  }
-#endif
-
-  return str;
-}
-
 
 /* this function signs the session id */
 ssh_string ssh_sign_session_id(ssh_session session, ssh_private_key privatekey) {