From 6bd0f2e9a131c6db2cdf7d1480162f087468e23c Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Mon, 21 May 2012 09:35:14 +0200
Subject: add key generator

hbbp_keygen generates all four keys private, public for sender and
receiver with the file names used in hbbp[cd] in the current working
directory.

diff --git a/Makefile b/Makefile
index 87a65e8..0149285 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
-BIN=hbbpd hbbpc
- 
+ifndef BIN
+BIN=hbbpd hbbpc hbbp_keygen
+endif
+
 ifndef EXTERNAL_NACL
 CFLAGS  += -Inacl/include/
 LDFLAGS += -Lnacl/lib/
diff --git a/hbbp_keygen.c b/hbbp_keygen.c
new file mode 100644
index 0000000..6bcde5c
--- /dev/null
+++ b/hbbp_keygen.c
@@ -0,0 +1,48 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "crypto.h"
+
+
+#define pub_len  crypto_box_PUBLICKEYBYTES
+#define priv_len crypto_box_SECRETKEYBYTES
+
+const char *name[4] = {"recv.pub", "recv.priv", "send.pub", "send.priv"};
+
+void error_cleanup(int num) {
+    for (int i = 0; i < num; i++)
+	unlink(name[i]);
+    exit(1);
+}
+
+int main() {
+  int fd[4], i;
+  byte key_pub [2][pub_len],
+       key_priv[2][priv_len];
+
+  /* open files */
+  for (i=0; i<4; i++) {
+    if ((fd[i] = open(name[i], O_WRONLY|O_CREAT|O_EXCL,
+		      (i%2) ? 0400 : 0444)) == -1) {
+      fprintf(stderr, 
+	      (errno == EEXIST)
+	      ? "%s already exists\n" : "could not create file %s\n",
+	      name[i]);
+      error_cleanup(i);
+    }
+  }
+
+  /* generate keys */
+  for (i=0; i<2; i++) {
+    crypto_box_keypair(key_pub[i], key_priv[i]);
+    if ((write(fd[2*i  ], key_pub[i],  pub_len)  != pub_len)
+     || (write(fd[2*i+1], key_priv[i], priv_len) != priv_len)
+     || (close(fd[2*i  ]) == -1)
+     || (close(fd[2*i+1]) == -1)) {
+      error_cleanup(4);
+    }
+  }
+
+  return 0;
+}
-- 
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