Initial checkin1.5.6

1 files changed, 134 insertions, 0 deletions

diff --git a/src/def_mode.cpp b/src/def_mode.cpp
new file mode 100644
index 000000000..ca9692128
--- /dev/null
+++ b/src/def_mode.cpp
@@ -0,0 +1,134 @@
+/*************************************************
+* Default Engine Source File                     *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/eng_def.h>
+#include <botan/parsing.h>
+#include <botan/filters.h>
+#include <botan/lookup.h>
+#include <botan/ecb.h>
+#include <botan/cbc.h>
+#include <botan/cts.h>
+#include <botan/cfb.h>
+#include <botan/ofb.h>
+#include <botan/ctr.h>
+#include <botan/eax.h>
+
+namespace Botan {
+
+namespace {
+
+/*************************************************
+* Get a cipher object                            *
+*************************************************/
+Keyed_Filter* do_get_cipher(const std::string& algo_spec,
+                            Cipher_Dir direction)
+   {
+   std::vector<std::string> algo_parts = split_on(algo_spec, '/');
+   if(algo_parts.empty())
+      throw Invalid_Algorithm_Name(algo_spec);
+
+   const std::string cipher = algo_parts[0];
+
+   if(have_stream_cipher(cipher))
+      {
+      if(algo_parts.size() == 1)
+         return new StreamCipher_Filter(cipher);
+      return 0;
+      }
+   else if(have_block_cipher(cipher))
+      {
+      if(algo_parts.size() != 2 && algo_parts.size() != 3)
+         return 0;
+
+      std::string mode = algo_parts[1];
+      u32bit bits = 0;
+
+      if(mode.find("CFB") != std::string::npos ||
+         mode.find("EAX") != std::string::npos)
+         {
+         std::vector<std::string> algo_info = parse_algorithm_name(mode);
+         mode = algo_info[0];
+         if(algo_info.size() == 1)
+            bits = 8*block_size_of(cipher);
+         else if(algo_info.size() == 2)
+            bits = to_u32bit(algo_info[1]);
+         else
+            throw Invalid_Algorithm_Name(algo_spec);
+         }
+
+      std::string padding;
+      if(algo_parts.size() == 3)
+         padding = algo_parts[2];
+      else
+         padding = (mode == "CBC") ? "PKCS7" : "NoPadding";
+
+      if(mode == "ECB" && padding == "CTS")
+         return 0;
+      else if((mode != "CBC" && mode != "ECB") && padding != "NoPadding")
+         throw Invalid_Algorithm_Name(algo_spec);
+
+      if(mode == "OFB")         return new OFB(cipher);
+      else if(mode == "CTR-BE") return new CTR_BE(cipher);
+      else if(mode == "ECB" || mode == "CBC" || mode == "CTS" ||
+              mode == "CFB" || mode == "EAX")
+         {
+         if(mode == "ECB")
+            {
+            if(direction == ENCRYPTION)
+               return new ECB_Encryption(cipher, padding);
+            else
+               return new ECB_Decryption(cipher, padding);
+            }
+         else if(mode == "CFB")
+            {
+            if(direction == ENCRYPTION)
+               return new CFB_Encryption(cipher, bits);
+            else
+               return new CFB_Decryption(cipher, bits);
+            }
+         else if(mode == "CBC")
+            {
+            if(padding == "CTS")
+               {
+               if(direction == ENCRYPTION)
+                  return new CTS_Encryption(cipher);
+               else
+                  return new CTS_Decryption(cipher);
+               }
+            if(direction == ENCRYPTION)
+               return new CBC_Encryption(cipher, padding);
+            else
+               return new CBC_Decryption(cipher, padding);
+            }
+         else if(mode == "EAX")
+            {
+            if(direction == ENCRYPTION)
+               return new EAX_Encryption(cipher, bits);
+            else
+               return new EAX_Decryption(cipher, bits);
+            }
+         else
+            throw Internal_Error("get_mode: " + cipher + "/"
+                                              + mode + "/" + padding);
+         }
+      else
+         return 0;
+      }
+
+   return 0;
+   }
+
+}
+
+/*************************************************
+* Get a cipher object                            *
+*************************************************/
+Keyed_Filter* Default_Engine::get_cipher(const std::string& algo_spec,
+                                         Cipher_Dir direction)
+   {
+   return do_get_cipher(algo_spec, direction);
+   }
+
+}