sxt: added skel for sxtkeys;

include/Makefile.am

@@ -4,4 +4,5 @@ nobase_include_HEADERS = sxmp/sxmp.h sxmp/errno.h sxmp/limits.h sxmp/version.h \
 	sexpr/sexp_memory.h sexpr/sexp_ops.h sexpr/sexp_vis.h \
 	tdata/bitwise.h tdata/idx_allocator.h tdata/macro.h tdata/tree.h \
 	tdata/usrtc.h tdata/list.h tdata/ctrie.h \
-	ydaemon/ydaemon.h ydaemon/cache.h ydaemon/dataobject.h
+	ydaemon/ydaemon.h ydaemon/cache.h ydaemon/dataobject.h \
+	sxt/sxtkey.h

include/sxt/sxtkey.h

@@ -0,0 +1,50 @@
+/*
+ * Secure eXtended Message Passing framework
+ * Secure eXtended Transport layer implementation: (libsxt)
+ * - very similar to SSH2/TLS
+ * - using already proven and tested crypto algos
+ * - better than TLS for message passing
+ *
+ * PublicPrivateKeyPairs operation API
+ *
+ * Copyright (c) 2014 by Aris Adamantiadis
+ * (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
+ *
+ * libsxmp is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libsxmp is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
+ *
+ */
+
+#ifndef __SXT_SXTKEY_H__
+#define __SXT_SXTKEY_H__
+
+/* some taken code , copyright left in the header */
+#define ED25519_PK_LEN 32
+#define ED25519_SK_LEN 64
+#define ED25519_SIG_LEN 64
+
+typedef uint8_t ed25519_pubkey[ED25519_PK_LEN];
+typedef uint8_t ed25519_privkey[ED25519_SK_LEN];
+typedef uint8_t ed25519_signature[ED25519_SIG_LEN];
+
+/* here the supported types in SXT */
+#define PPKP_ED25519  0xa
+
+typedef struct sxtkey_type {
+  uint8_t type;
+  uint8_t flags;
+  ed25519_pubkey pubkey;
+  ed25519_privkey privkey;
+} sxtkey_t;
+
+#endif /* __SXT_SXTKEY_H__ */