sxt: safebuffer ops added;

include/sxt/safebuf.h

@@ -0,0 +1,58 @@
+/*
+ * 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
+ *
+ * (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_SXTSAFEBUF_H__
+#define __SXT_SXTSAFEBUF_H__
+
+/* size and data, no padding */
+typedef struct sxtsafebuffer_type {
+  uint32_t size;
+  unsigned char data[1];
+} __attribute__((packed)) sxtsafebuffer_t;
+
+/* functions to operate with this,
+ * please note, since it used within network
+ * context, few things must be applied.
+ */
+sxtsafebuffer_t *sxtsafebuffer_new(size_t);
+
+int sxtsafebuffer_setdata(sxtsafebuffer_t *, const void *, size_t);
+
+size_t sxtsafebuffer_length(sxtsafebuffer_t *);
+
+void sxtsafebuffer_destroy(sxtsafebuffer_t *);
+
+void *sxtsafebuffer_getdata(sxtsafebuffer_t *);
+
+/* C string ops */
+const char *sxtsafebuffer_tocstr(sxtsafebuffer_t *);
+
+sxtsafebuffer_t *sxtsafebuffer_new_fromcstr(const char *);
+
+/* returning value should be freed after use */
+char *sxtsafebuffer_getcstr(sxtsafebuffer_t *);
+
+void sxtsafebuffer_freecstr(char *);
+
+#endif

sxt/Makefile.am

@@ -14,7 +14,8 @@ lib_LTLIBRARIES = libsxt.la
 
 
 libsxt_la_SOURCES = \
-	core.c ppkp_ops.c fe25519.c ge25519.c sc25519.c ed25519.c
+	core.c safebuffer.c ppkp_ops.c fe25519.c ge25519.c \
+	sc25519.c ed25519.c
 
 libsxt_la_LDFLAGS = 
 

sxt/safebuffer.c

@@ -0,0 +1,140 @@
+/*
+ * 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
+ *
+ * (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/>.";
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include <sxt/safebuf.h>
+
+sxtsafebuffer_t *sxtsafebuffer_new(size_t size)
+{
+  sxtsafebuffer_t *buf = NULL;
+
+  if(size > (UINT_MAX - sizeof(sxtsafebuffer_t))) return NULL;
+
+  if(!(buf = malloc(sizeof(sxtsafebuffer_t) + size))) return NULL;
+
+  buf->size = htonl(size);
+  buf->data[0] = 0;
+
+  return buf;
+}
+
+int sxtsafebuffer_setdata(sxtsafebuffer_t *buf, const void *data, size_t size)
+{
+  /* validate parameters */
+  if(!buf || !data) return -1;
+  if(!size || size > sxtsafebuffer_length(buf)) return -1;
+
+  memcpy(buf->data, data, size);
+
+  return 0;
+}
+
+size_t sxtsafebuffer_length(sxtsafebuffer_t *buf)
+{
+  size_t size = 0;
+
+  if(!buf) return size;
+  else size = ntohl(buf->size);
+
+  if((size > 0) && (size < UINT_MAX)) return size;
+
+  return 0;
+}
+
+void sxtsafebuffer_destroy(sxtsafebuffer_t *buf)
+{
+  if(!buf) return;
+
+  buf->size = 0;
+  memset((void *)buf->data, 0, sxtsafebuffer_length(buf));
+  free(buf);
+
+  return;
+}
+
+void *sxtsafebuffer_getdata(sxtsafebuffer_t *buf)
+{
+  if(!buf) return NULL;
+
+  return (void *)buf->data;
+}
+
+/* C string ops */
+const char *sxtsafebuffer_tocstr(sxtsafebuffer_t *buf)
+{
+  if(!buf) return NULL;
+
+  buf->data[sxtsafebuffer_length(buf)] = '\0';
+
+  return (const char *)buf->data;;
+}
+
+sxtsafebuffer_t *sxtsafebuffer_new_fromcstr(const char *str)
+{
+  size_t length;
+  sxtsafebuffer_t *buf = NULL;
+
+  if(!str) return NULL;
+  else length = strlen(str);
+
+  if(!(buf = sxtsafebuffer_new(length))) return NULL;
+  else memcpy(buf->data, str, length);
+
+  return buf;
+}
+
+/* returning value should be freed after use */
+char *sxtsafebuffer_getcstr(sxtsafebuffer_t *buf)
+{
+  size_t length;
+  char *str = NULL;
+
+  if(!buf) return NULL;
+
+  length = sxtsafebuffer_length(buf);
+  if(length <= 0) return NULL;
+
+  if(!(str = malloc(length + 1))) return NULL;
+  else memcpy(str, buf->data, length);
+
+  str[length] = '\0';
+
+  return str;
+}
+
+void sxtsafebuffer_freecstr(char *str)
+{
+  if(!str) return;
+
+  memset(str, 0, strlen(str));
+  free(str);
+
+  return;
+}