1 files changed, 134 insertions, 0 deletions
diff --git a/doc/examples/rng_test.cpp b/doc/examples/rng_test.cpp
new file mode 100644
index 000000000..0a245ca9e
--- /dev/null
+++ b/doc/examples/rng_test.cpp
@@ -0,0 +1,134 @@
+#include <botan/botan.h>
+#include <botan/x931_rng.h>
+#include <botan/filters.h>
+
+#include <iostream>
+#include <fstream>
+#include <boost/algorithm/string.hpp>
+#include <stdexcept>
+
+using namespace Botan;
+
+std::vector<std::pair<std::string, std::string> > read_file(const std::string&);
+
+SecureVector<byte> decode_hex(const std::string& in)
+   {
+   SecureVector<byte> result;
+
+   try {
+      Botan::Pipe pipe(new Botan::Hex_Decoder);
+      pipe.process_msg(in);
+      result = pipe.read_all();
+   }
+   catch(std::exception& e)
+      {
+      result.destroy();
+      }
+   return result;
+   }
+
+std::string hex_encode(const byte in[], u32bit len)
+   {
+   Botan::Pipe pipe(new Botan::Hex_Encoder);
+   pipe.process_msg(in, len);
+   return pipe.read_all_as_string();
+   }
+
+class Fixed_Output_RNG : public RandomNumberGenerator
+   {
+   public:
+      bool is_seeded() const { return !buf.empty(); }
+
+      byte random()
+         {
+         if(buf.empty())
+            throw std::runtime_error("Out of bytes");
+
+         byte out = buf.front();
+         buf.pop_front();
+         return out;
+         }
+
+      void randomize(byte out[], u32bit len) throw()
+         {
+         for(u32bit j = 0; j != len; j++)
+            out[j] = random();
+         }
+
+      std::string name() const { return "Fixed_Output_RNG"; }
+
+      void clear() throw() {}
+
+      void add_randomness(const byte in[], u32bit len) throw()
+         {
+         buf.insert(buf.end(), in, in + len);
+         }
+
+      Fixed_Output_RNG() {}
+   private:
+      std::deque<byte> buf;
+   };
+
+void x931_tests(std::vector<std::pair<std::string, std::string> > vecs,
+                const std::string& cipher)
+   {
+   for(size_t j = 0; j != vecs.size(); ++j)
+      {
+      const std::string result = vecs[j].first;
+      const std::string input = vecs[j].second;
+
+      ANSI_X931_RNG prng(cipher, new Fixed_Output_RNG);
+
+      SecureVector<byte> x = decode_hex(input);
+      prng.add_entropy(x.begin(), x.size());
+
+      SecureVector<byte> output(result.size() / 2);
+      prng.randomize(output, output.size());
+
+      if(decode_hex(result) != output)
+         std::cout << "FAIL";
+      else
+         std::cout << "PASS";
+
+      std::cout << " Seed " << input << " "
+                   << "Got " << hex_encode(output, output.size()) << " "
+                   << "Exp " << result << "\n";
+      }
+
+   }
+
+int main()
+   {
+   x931_tests(read_file("ANSI931_AES128VST.txt.vst"), "AES-128");
+   x931_tests(read_file("ANSI931_AES192VST.txt.vst"), "AES-192");
+   x931_tests(read_file("ANSI931_AES256VST.txt.vst"), "AES-256");
+   x931_tests(read_file("ANSI931_TDES2VST.txt.vst"), "TripleDES");
+   x931_tests(read_file("ANSI931_TDES3VST.txt.vst"), "TripleDES");
+   }
+
+
+std::vector<std::pair<std::string, std::string> > read_file(const std::string& fsname)
+   {
+   std::ifstream in(fsname.c_str());
+
+   std::vector<std::pair<std::string, std::string> > out;
+
+   while(in.good())
+      {
+      std::string line;
+      std::getline(in, line);
+
+      if(line == "")
+         break;
+
+      std::vector<std::string> l;
+      boost::split(l, line, boost::is_any_of(":"));
+
+      if(l.size() != 2)
+         throw std::runtime_error("Bad line " + line);
+
+      out.push_back(std::make_pair(l[0], l[1]));
+      }
+
+   return out;
+   }