1 files changed, 39 insertions, 0 deletions
diff --git a/src/libstate/engine/openssl/arc4_openssl.cpp b/src/libstate/engine/openssl/arc4_openssl.cpp
index c1d0779b3..59bdd30d7 100644
--- a/src/libstate/engine/openssl/arc4_openssl.cpp
+++ b/src/libstate/engine/openssl/arc4_openssl.cpp
@@ -9,6 +9,28 @@
 
 namespace Botan {
 
+namespace {
+
+/**
+* ARC4 as implemented by OpenSSL
+*/
+class ARC4_OpenSSL : public StreamCipher
+   {
+   public:
+      void clear() throw() { std::memset(&state, 0, sizeof(state)); }
+      std::string name() const;
+      StreamCipher* clone() const { return new ARC4_OpenSSL(SKIP); }
+
+      ARC4_OpenSSL(u32bit s = 0) : StreamCipher(1, 32), SKIP(s) { clear(); }
+      ~ARC4_OpenSSL() { clear(); }
+   private:
+      void cipher(const byte[], byte[], u32bit);
+      void key_schedule(const byte[], u32bit);
+
+      const u32bit SKIP;
+      RC4_KEY state;
+   };
+
 /*************************************************
 * Return the name of this type                   *
 *************************************************/
@@ -39,3 +61,20 @@ void ARC4_OpenSSL::cipher(const byte in[], byte out[], u32bit length)
    }
 
 }
+
+/**
+* Look for an OpenSSL-suported stream cipher (ARC4)
+*/
+StreamCipher*
+OpenSSL_Engine::find_stream_cipher(const SCAN_Name& request,
+                                   Algorithm_Factory&) const
+   {
+   if(request.algo_name() == "ARC4")
+      return new ARC4_OpenSSL(request.argument_as_u32bit(0, 0));
+   if(request.algo_name() == "RC4_drop")
+      return new ARC4_OpenSSL(768);
+
+   return 0;
+   }
+
+}