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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@

/*
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]);
}