1 files changed, 105 insertions, 0 deletions
diff --git a/modules/es_unix/es_unix.cpp b/modules/es_unix/es_unix.cpp
new file mode 100644
index 000000000..d1efd4fa9
--- /dev/null
+++ b/modules/es_unix/es_unix.cpp
@@ -0,0 +1,105 @@
+/*************************************************
+* Unix EntropySource Source File                 *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/es_unix.h>
+#include <botan/unix_cmd.h>
+#include <botan/parsing.h>
+#include <botan/conf.h>
+
+namespace Botan {
+
+namespace {
+
+/*************************************************
+* Sort ordering by priority                      *
+*************************************************/
+bool Unix_Program_Cmp(const Unix_Program& a, const Unix_Program& b)
+   { return (a.priority < b.priority); }
+
+}
+
+/*************************************************
+* Unix_EntropySource Constructor                 *
+*************************************************/
+Unix_EntropySource::Unix_EntropySource()
+   {
+   add_default_sources(sources);
+   }
+
+/*************************************************
+* Add sources to the list                        *
+*************************************************/
+void Unix_EntropySource::add_sources(const Unix_Program srcs[], u32bit count)
+   {
+   sources.insert(sources.end(), srcs, srcs + count);
+   std::sort(sources.begin(), sources.end(), Unix_Program_Cmp);
+   }
+
+/*************************************************
+* Unix Fast Poll                                 *
+*************************************************/
+void Unix_EntropySource::do_fast_poll()
+   {
+   gather(2*1024);
+   }
+
+/*************************************************
+* Unix Slow Poll                                 *
+*************************************************/
+void Unix_EntropySource::do_slow_poll()
+   {
+   gather(16*1024);
+   }
+
+/*************************************************
+* Gather Entropy From Several Unix_Programs      *
+*************************************************/
+void Unix_EntropySource::gather(u32bit target_amount)
+   {
+   const u32bit MINIMAL_WORKING = 32;
+
+   u32bit got = 0;
+   for(u32bit j = 0; j != sources.size(); j++)
+      {
+      add_timestamp();
+
+      got += gather_from(sources[j]);
+      sources[j].working = (got >= MINIMAL_WORKING) ? true : false;
+
+      if(got >= target_amount)
+         break;
+      }
+   }
+
+/*************************************************
+* Gather entropy from a Unix program             *
+*************************************************/
+u32bit Unix_EntropySource::gather_from(const Unix_Program& prog)
+   {
+   const std::string BASE_PATH = "/bin:/sbin:/usr/bin:/usr/sbin";
+   const std::string EXTRA_PATH = Config::get_string("rng/unix_path");
+
+   std::string PATH = BASE_PATH;
+   if(EXTRA_PATH != "")
+      PATH += ':' + EXTRA_PATH;
+
+   DataSource_Command pipe(prog.name_and_args, PATH);
+   if(pipe.end_of_data())
+      return 0;
+
+   u32bit got = 0;
+   SecureVector<byte> buffer(DEFAULT_BUFFERSIZE);
+
+   while(!pipe.end_of_data())
+      {
+      u32bit this_loop = pipe.read(buffer, buffer.size());
+      add_bytes(buffer, this_loop);
+      got += this_loop;
+      }
+
+   return got;
+   }
+
+}