1 files changed, 89 insertions, 0 deletions
diff --git a/src/lib/engine/openssl/ossl_arc4.cpp b/src/lib/engine/openssl/ossl_arc4.cpp
new file mode 100644
index 000000000..0eb404af1
--- /dev/null
+++ b/src/lib/engine/openssl/ossl_arc4.cpp
@@ -0,0 +1,89 @@
+/*
+* OpenSSL RC4
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/internal/openssl_engine.h>
+#include <botan/parsing.h>
+#include <openssl/rc4.h>
+
+namespace Botan {
+
+namespace {
+
+/**
+* RC4 as implemented by OpenSSL
+*/
+class RC4_OpenSSL : public StreamCipher
+   {
+   public:
+      void clear() { clear_mem(&state, 1); }
+
+      std::string name() const;
+      StreamCipher* clone() const { return new RC4_OpenSSL(SKIP); }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(1, 32);
+         }
+
+
+      RC4_OpenSSL(size_t s = 0) : SKIP(s) { clear(); }
+      ~RC4_OpenSSL() { clear(); }
+   private:
+      void cipher(const byte[], byte[], size_t);
+      void key_schedule(const byte[], size_t);
+
+      const size_t SKIP;
+      RC4_KEY state;
+   };
+
+/*
+* Return the name of this type
+*/
+std::string RC4_OpenSSL::name() const
+   {
+   if(SKIP == 0)   return "RC4";
+   if(SKIP == 256) return "MARK-4";
+   else            return "RC4_skip(" + std::to_string(SKIP) + ")";
+   }
+
+/*
+* RC4 Key Schedule
+*/
+void RC4_OpenSSL::key_schedule(const byte key[], size_t length)
+   {
+   RC4_set_key(&state, length, key);
+   byte dummy = 0;
+   for(size_t i = 0; i != SKIP; ++i)
+      RC4(&state, 1, &dummy, &dummy);
+   }
+
+/*
+* RC4 Encryption
+*/
+void RC4_OpenSSL::cipher(const byte in[], byte out[], size_t length)
+   {
+   RC4(&state, length, in, out);
+   }
+
+}
+
+/**
+* Look for an OpenSSL-supported stream cipher (RC4)
+*/
+StreamCipher*
+OpenSSL_Engine::find_stream_cipher(const SCAN_Name& request,
+                                   Algorithm_Factory&) const
+   {
+   if(request.algo_name() == "RC4")
+      return new RC4_OpenSSL(request.arg_as_integer(0, 0));
+   if(request.algo_name() == "RC4_drop")
+      return new RC4_OpenSSL(768);
+
+   return 0;
+   }
+
+}