1 files changed, 19 insertions, 0 deletions

diff --git a/nacl/crypto_secretbox/wrapper-box.cpp b/nacl/crypto_secretbox/wrapper-box.cpp
new file mode 100644
index 00000000..fb8b1784
--- /dev/null
+++ b/nacl/crypto_secretbox/wrapper-box.cpp
@@ -0,0 +1,19 @@
+#include <string>
+using std::string;
+#include "crypto_secretbox.h"
+
+string crypto_secretbox(const string &m,const string &n,const string &k)
+{
+  if (k.size() != crypto_secretbox_KEYBYTES) throw "incorrect key length";
+  if (n.size() != crypto_secretbox_NONCEBYTES) throw "incorrect nonce length";
+  size_t mlen = m.size() + crypto_secretbox_ZEROBYTES;
+  unsigned char mpad[mlen];
+  for (int i = 0;i < crypto_secretbox_ZEROBYTES;++i) mpad[i] = 0;
+  for (int i = crypto_secretbox_ZEROBYTES;i < mlen;++i) mpad[i] = m[i - crypto_secretbox_ZEROBYTES];
+  unsigned char cpad[mlen];
+  crypto_secretbox(cpad,mpad,mlen,(const unsigned char *) n.c_str(),(const unsigned char *) k.c_str());
+  return string(
+    (char *) cpad + crypto_secretbox_BOXZEROBYTES,
+    mlen - crypto_secretbox_BOXZEROBYTES
+  );
+}