1 files changed, 82 insertions, 0 deletions
diff --git a/botan/src/engine/openssl/arc4_openssl.cpp b/botan/src/engine/openssl/arc4_openssl.cpp
new file mode 100644
index 0000000..08ed3eb
--- /dev/null
+++ b/botan/src/engine/openssl/arc4_openssl.cpp
@@ -0,0 +1,82 @@
+/*
+* OpenSSL ARC4
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/eng_ossl.h>
+#include <botan/parsing.h>
+#include <openssl/rc4.h>
+
+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
+*/
+std::string ARC4_OpenSSL::name() const
+   {
+   if(SKIP == 0)   return "ARC4";
+   if(SKIP == 256) return "MARK-4";
+   else            return "RC4_skip(" + to_string(SKIP) + ")";
+   }
+
+/*
+* ARC4 Key Schedule
+*/
+void ARC4_OpenSSL::key_schedule(const byte key[], u32bit length)
+   {
+   RC4_set_key(&state, length, key);
+   byte dummy = 0;
+   for(u32bit j = 0; j != SKIP; j++)
+      RC4(&state, 1, &dummy, &dummy);
+   }
+
+/*
+* ARC4 Encryption
+*/
+void ARC4_OpenSSL::cipher(const byte in[], byte out[], u32bit length)
+   {
+   RC4(&state, length, in, out);
+   }
+
+}
+
+/**
+* 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.arg_as_u32bit(0, 0));
+   if(request.algo_name() == "RC4_drop")
+      return new ARC4_OpenSSL(768);
+
+   return 0;
+   }
+
+}