upstream: Add experimental support for PQC XMSS keys (Extended

Hash-Based Signatures) The code is not compiled in by default (see WITH_XMSS
in Makefile.inc) Joint work with stefan-lukas_gazdag at genua.eu See
https://tools.ietf.org/html/draft-irtf-cfrg-xmss-hash-based-signatures-12 ok
djm@

OpenBSD-Commit-ID: ef3eccb96762a5d6f135d7daeef608df7776a7ac

1 files changed, 27 insertions, 0 deletions

diff --git a/xmss_commons.c b/xmss_commons.c
new file mode 100644
index 000000000..51171af91
--- /dev/null
+++ b/xmss_commons.c
@@ -0,0 +1,27 @@
+/*
+xmss_commons.c 20160722
+Andreas Hülsing
+Joost Rijneveld
+Public domain.
+*/
+
+#include "xmss_commons.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+void to_byte(unsigned char *out, unsigned long long in, uint32_t bytes)
+{
+  int32_t i;
+  for (i = bytes-1; i >= 0; i--) {
+    out[i] = in & 0xff;
+    in = in >> 8;
+  }
+}
+
+void hexdump(const unsigned char *a, size_t len)
+{
+  size_t i;
+  for (i = 0; i < len; i++)
+    printf("%02x", a[i]);
+}
\ No newline at end of file