1 files changed, 92 insertions, 0 deletions
diff --git a/modules/eng_ossl/ossl_rc4.cpp b/modules/eng_ossl/ossl_rc4.cpp
new file mode 100644
index 000000000..3c8f96f72
--- /dev/null
+++ b/modules/eng_ossl/ossl_rc4.cpp
@@ -0,0 +1,92 @@
+/*************************************************
+* OpenSSL ARC4 Source File                       *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/eng_ossl.h>
+#include <botan/lookup.h>
+#include <botan/parsing.h>
+#include <openssl/rc4.h>
+
+namespace Botan {
+
+namespace {
+
+/*************************************************
+* OpenSSL ARC4                                   *
+*************************************************/
+class OpenSSL_ARC4 : public StreamCipher
+   {
+   public:
+      void clear() throw() { std::memset(&state, 0, sizeof(state)); }
+      std::string name() const;
+      StreamCipher* clone() const { return new OpenSSL_ARC4(SKIP); }
+      OpenSSL_ARC4(u32bit s = 0) : StreamCipher(1, 32), SKIP(s) { clear(); }
+      ~OpenSSL_ARC4() { clear(); }
+   private:
+      void cipher(const byte[], byte[], u32bit);
+      void key(const byte[], u32bit);
+
+      const u32bit SKIP;
+      RC4_KEY state;
+   };
+
+/*************************************************
+* Return the name of this type                   *
+*************************************************/
+std::string OpenSSL_ARC4::name() const
+   {
+   if(SKIP == 0)   return "ARC4";
+   if(SKIP == 256) return "MARK-4";
+   else            return "RC4_skip(" + to_string(SKIP) + ")";
+   }
+
+/*************************************************
+* ARC4 Key Schedule                              *
+*************************************************/
+void OpenSSL_ARC4::key(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 OpenSSL_ARC4::cipher(const byte in[], byte out[], u32bit length)
+   {
+   RC4(&state, length, in, out);
+   }
+
+}
+
+/*************************************************
+* Look for an algorithm with this name           *
+*************************************************/
+StreamCipher*
+OpenSSL_Engine::find_stream_cipher(const std::string& algo_spec) const
+   {
+   std::vector<std::string> name = parse_algorithm_name(algo_spec);
+   if(name.size() == 0)
+      return 0;
+   const std::string algo_name = deref_alias(name[0]);
+
+#define HANDLE_TYPE_ONE_U32BIT(NAME, TYPE, DEFAULT) \
+   if(algo_name == NAME)                            \
+      {                                             \
+      if(name.size() == 1)                          \
+         return new TYPE(DEFAULT);                  \
+      if(name.size() == 2)                          \
+         return new TYPE(to_u32bit(name[1]));       \
+      throw Invalid_Algorithm_Name(algo_spec);      \
+      }
+
+   HANDLE_TYPE_ONE_U32BIT("ARC4", OpenSSL_ARC4, 0);
+   HANDLE_TYPE_ONE_U32BIT("RC4_drop", OpenSSL_ARC4, 768);
+
+   return 0;
+   }
+
+}