1 files changed, 149 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/stream/stream_cipher.cpp b/comm/third_party/botan/src/lib/stream/stream_cipher.cpp
new file mode 100644
index 0000000000..340682ce25
--- /dev/null
+++ b/comm/third_party/botan/src/lib/stream/stream_cipher.cpp
@@ -0,0 +1,149 @@
+/*
+* Stream Ciphers
+* (C) 2015,2016 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/stream_cipher.h>
+#include <botan/scan_name.h>
+#include <botan/exceptn.h>
+
+#if defined(BOTAN_HAS_CHACHA)
+  #include <botan/chacha.h>
+#endif
+
+#if defined(BOTAN_HAS_SALSA20)
+  #include <botan/salsa20.h>
+#endif
+
+#if defined(BOTAN_HAS_SHAKE_CIPHER)
+  #include <botan/shake_cipher.h>
+#endif
+
+#if defined(BOTAN_HAS_CTR_BE)
+  #include <botan/ctr.h>
+#endif
+
+#if defined(BOTAN_HAS_OFB)
+  #include <botan/ofb.h>
+#endif
+
+#if defined(BOTAN_HAS_RC4)
+  #include <botan/rc4.h>
+#endif
+
+#if defined(BOTAN_HAS_OPENSSL)
+  #include <botan/internal/openssl.h>
+#endif
+
+namespace Botan {
+
+std::unique_ptr<StreamCipher> StreamCipher::create(const std::string& algo_spec,
+                                                   const std::string& provider)
+   {
+   const SCAN_Name req(algo_spec);
+
+#if defined(BOTAN_HAS_CTR_BE)
+   if((req.algo_name() == "CTR-BE" || req.algo_name() == "CTR") && req.arg_count_between(1,2))
+      {
+      if(provider.empty() || provider == "base")
+         {
+         auto cipher = BlockCipher::create(req.arg(0));
+         if(cipher)
+            {
+            size_t ctr_size = req.arg_as_integer(1, cipher->block_size());
+            return std::unique_ptr<StreamCipher>(new CTR_BE(cipher.release(), ctr_size));
+            }
+         }
+      }
+#endif
+
+#if defined(BOTAN_HAS_CHACHA)
+   if(req.algo_name() == "ChaCha")
+      {
+      if(provider.empty() || provider == "base")
+         return std::unique_ptr<StreamCipher>(new ChaCha(req.arg_as_integer(0, 20)));
+      }
+
+   if(req.algo_name() == "ChaCha20")
+      {
+      if(provider.empty() || provider == "base")
+         return std::unique_ptr<StreamCipher>(new ChaCha(20));
+      }
+#endif
+
+#if defined(BOTAN_HAS_SALSA20)
+   if(req.algo_name() == "Salsa20")
+      {
+      if(provider.empty() || provider == "base")
+         return std::unique_ptr<StreamCipher>(new Salsa20);
+      }
+#endif
+
+#if defined(BOTAN_HAS_SHAKE_CIPHER)
+   if(req.algo_name() == "SHAKE-128" || req.algo_name() == "SHAKE-128-XOF")
+      {
+      if(provider.empty() || provider == "base")
+         return std::unique_ptr<StreamCipher>(new SHAKE_128_Cipher);
+      }
+#endif
+
+#if defined(BOTAN_HAS_OFB)
+   if(req.algo_name() == "OFB" && req.arg_count() == 1)
+      {
+      if(provider.empty() || provider == "base")
+         {
+         if(auto c = BlockCipher::create(req.arg(0)))
+            return std::unique_ptr<StreamCipher>(new OFB(c.release()));
+         }
+      }
+#endif
+
+#if defined(BOTAN_HAS_RC4)
+
+   if(req.algo_name() == "RC4" ||
+      req.algo_name() == "ARC4" ||
+      req.algo_name() == "MARK-4")
+      {
+      const size_t skip = (req.algo_name() == "MARK-4") ? 256 : req.arg_as_integer(0, 0);
+
+#if defined(BOTAN_HAS_OPENSSL)
+      if(provider.empty() || provider == "openssl")
+         {
+         return std::unique_ptr<StreamCipher>(make_openssl_rc4(skip));
+         }
+#endif
+
+      if(provider.empty() || provider == "base")
+         {
+         return std::unique_ptr<StreamCipher>(new RC4(skip));
+         }
+      }
+
+#endif
+
+   BOTAN_UNUSED(req);
+   BOTAN_UNUSED(provider);
+
+   return nullptr;
+   }
+
+//static
+std::unique_ptr<StreamCipher>
+StreamCipher::create_or_throw(const std::string& algo,
+                             const std::string& provider)
+   {
+   if(auto sc = StreamCipher::create(algo, provider))
+      {
+      return sc;
+      }
+   throw Lookup_Error("Stream cipher", algo, provider);
+   }
+
+std::vector<std::string> StreamCipher::providers(const std::string& algo_spec)
+   {
+   return probe_providers_of<StreamCipher>(algo_spec, {"base", "openssl"});
+   }
+
+}