release/src/router/dnscrypt/src/libnacl/crypto_box/wrapper-box.cpp

   1 #include <string>
   2 using std::string;
   3 #include "crypto_box.h"
   4
   5 string crypto_box(const string &m,const string &n,const string &pk,const string &sk)
   6 {
   7   if (pk.size() != crypto_box_PUBLICKEYBYTES) throw "incorrect public-key length";
   8   if (sk.size() != crypto_box_SECRETKEYBYTES) throw "incorrect secret-key length";
   9   if (n.size() != crypto_box_NONCEBYTES) throw "incorrect nonce length";
  10   size_t mlen = m.size() + crypto_box_ZEROBYTES;
  11   unsigned char mpad[mlen];
  12   for (int i = 0;i < crypto_box_ZEROBYTES;++i) mpad[i] = 0;
  13   for (int i = crypto_box_ZEROBYTES;i < mlen;++i) mpad[i] = m[i - crypto_box_ZEROBYTES];
  14   unsigned char cpad[mlen];
  15   crypto_box(cpad,mpad,mlen,
  16     (const unsigned char *) n.c_str(),
  17     (const unsigned char *) pk.c_str(),
  18     (const unsigned char *) sk.c_str()
  19     );
  20   return string(
  21     (char *) cpad + crypto_box_BOXZEROBYTES,
  22     mlen - crypto_box_BOXZEROBYTES
  23   );
  24 }