Add a new interface CryptoBox which provides basic password-based encryption

in a reasonable way. Low on features, which is rather intentional. There
is a version code included in the format so further extensions are possible, if
warranted.

Inspired by the n-th mailing list request for such a class. Realized it was
probably better that I design such code than random people who just want
'something that works'.

1 files changed, 50 insertions, 0 deletions

diff --git a/doc/examples/cryptobox.cpp b/doc/examples/cryptobox.cpp
new file mode 100644
index 000000000..0a769b0cd
--- /dev/null
+++ b/doc/examples/cryptobox.cpp
@@ -0,0 +1,50 @@
+/*
+* Cryptobox example
+*/
+#include <botan/botan.h>
+#include <botan/cryptobox.h>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+using namespace Botan;
+
+int main(int argc, char* argv[])
+   {
+   LibraryInitializer init;
+
+   AutoSeeded_RNG rng;
+
+   if(argc != 3)
+      {
+      std::cout << "Usage: cryptobox pass filename\n";
+      return 1;
+      }
+
+   std::string pass = argv[1];
+   std::string filename = argv[2];
+
+   std::ifstream input(filename.c_str());
+
+   std::vector<byte> file_contents;
+   while(input.good())
+      {
+      byte filebuf[4096] = { 0 };
+      input.read((char*)filebuf, sizeof(filebuf));
+      size_t got = input.gcount();
+
+      file_contents.insert(file_contents.end(), filebuf, filebuf+got);
+      }
+
+   std::string ciphertext = CryptoBox::encrypt(&file_contents[0],
+                                               file_contents.size(),
+                                               pass, rng);
+
+   std::cout << ciphertext;
+
+   /*
+   std::cout << CryptoBox::decrypt((const byte*)&ciphertext[0],
+                                   ciphertext.length(),
+                                   pass);
+   */
+   }