1 files changed, 24 insertions, 0 deletions

diff --git a/nacl/crypto_box/wrapper-box.cpp b/nacl/crypto_box/wrapper-box.cpp
new file mode 100644
index 00000000..f0429295
--- /dev/null
+++ b/nacl/crypto_box/wrapper-box.cpp
@@ -0,0 +1,24 @@
+#include <string>
+using std::string;
+#include "crypto_box.h"
+
+string crypto_box(const string &m,const string &n,const string &pk,const string &sk)
+{
+  if (pk.size() != crypto_box_PUBLICKEYBYTES) throw "incorrect public-key length";
+  if (sk.size() != crypto_box_SECRETKEYBYTES) throw "incorrect secret-key length";
+  if (n.size() != crypto_box_NONCEBYTES) throw "incorrect nonce length";
+  size_t mlen = m.size() + crypto_box_ZEROBYTES;
+  unsigned char mpad[mlen];
+  for (int i = 0;i < crypto_box_ZEROBYTES;++i) mpad[i] = 0;
+  for (int i = crypto_box_ZEROBYTES;i < mlen;++i) mpad[i] = m[i - crypto_box_ZEROBYTES];
+  unsigned char cpad[mlen];
+  crypto_box(cpad,mpad,mlen,
+    (const unsigned char *) n.c_str(),
+    (const unsigned char *) pk.c_str(),
+    (const unsigned char *) sk.c_str()
+    );
+  return string(
+    (char *) cpad + crypto_box_BOXZEROBYTES,
+    mlen - crypto_box_BOXZEROBYTES
+  );
+}