1 files changed, 87 insertions, 0 deletions
diff --git a/modules/entropy/cryptoapi_rng/es_capi.cpp b/modules/entropy/cryptoapi_rng/es_capi.cpp
new file mode 100644
index 000000000..7d1e0e753
--- /dev/null
+++ b/modules/entropy/cryptoapi_rng/es_capi.cpp
@@ -0,0 +1,87 @@
+/*************************************************
+* Win32 CryptoAPI EntropySource Source File      *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/es_capi.h>
+#include <botan/parsing.h>
+#include <windows.h>
+#include <wincrypt.h>
+
+namespace Botan {
+
+/*************************************************
+* Gather Entropy from Win32 CAPI                 *
+*************************************************/
+u32bit Win32_CAPI_EntropySource::slow_poll(byte output[], u32bit length)
+   {
+
+   class CSP_Handle
+      {
+      public:
+         CSP_Handle(u64bit capi_provider)
+            {
+            valid = false;
+            DWORD prov_type = (DWORD)capi_provider;
+
+            if(CryptAcquireContext(&handle, 0, 0,
+                                   prov_type, CRYPT_VERIFYCONTEXT))
+               valid = true;
+            }
+
+         ~CSP_Handle()
+            {
+            if(is_valid())
+               CryptReleaseContext(handle, 0);
+            }
+
+         void gen_random(byte out[], u32bit n) const
+            {
+            if(is_valid())
+               CryptGenRandom(handle, n, out);
+            }
+
+         bool is_valid() const { return valid; }
+
+         HCRYPTPROV get_handle() const { return handle; }
+      private:
+         HCRYPTPROV handle;
+         bool valid;
+      };
+
+
+   if(length > 64)
+      length = 64;
+
+   for(u32bit j = 0; j != prov_types.size(); ++j)
+      {
+      CSP_Handle csp(prov_types[j]);
+      if(!csp.is_valid())
+         continue;
+
+      csp.gen_random(output, length);
+      break;
+      }
+   return length;
+   }
+
+/*************************************************
+* Gather Entropy from Win32 CAPI                 *
+*************************************************/
+Win32_CAPI_EntropySource::Win32_CAPI_EntropySource(const std::string& provs)
+   {
+   std::vector<std::string> capi_provs = split_on(provs, ':');
+
+   for(u32bit j = 0; j != capi_provs.size(); ++j)
+      {
+      if(capi_provs[j] == "RSA_FULL")  prov_types.push_back(PROV_RSA_FULL);
+      if(capi_provs[j] == "INTEL_SEC") prov_types.push_back(PROV_INTEL_SEC);
+      if(capi_provs[j] == "FORTEZZA")  prov_types.push_back(PROV_FORTEZZA);
+      if(capi_provs[j] == "RNG")       prov_types.push_back(PROV_RNG);
+      }
+
+   if(prov_types.size() == 0)
+      prov_types.push_back(PROV_RSA_FULL);
+   }
+
+}