Remove Algo_Registry

I repent my use of global constructors.
I repent my use of global locks.
Hopefully I will never touch this code again.
:)

1 files changed, 91 insertions, 22 deletions

diff --git a/src/lib/modes/aead/aead.cpp b/src/lib/modes/aead/aead.cpp
index 88e6cbeaa..033dad94e 100644
--- a/src/lib/modes/aead/aead.cpp
+++ b/src/lib/modes/aead/aead.cpp
@@ -5,8 +5,12 @@
 */
 
 #include <botan/aead.h>
-#include <botan/internal/mode_utils.h>
-#include <botan/internal/algo_registry.h>
+#include <botan/scan_name.h>
+#include <sstream>
+
+#if defined(BOTAN_HAS_BLOCK_CIPHER)
+  #include <botan/block_cipher.h>
+#endif
 
 #if defined(BOTAN_HAS_AEAD_CCM)
   #include <botan/ccm.h>
@@ -34,42 +38,107 @@
 
 namespace Botan {
 
-AEAD_Mode::~AEAD_Mode() {}
+AEAD_Mode* get_aead(const std::string& algo, Cipher_Dir dir)
+   {
+#if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
+   if(algo == "ChaCha20Poly1305")
+      {
+      if(dir == ENCRYPTION)
+         return new ChaCha20Poly1305_Encryption;
+      else
+         return new ChaCha20Poly1305_Decryption;
 
-#if defined(BOTAN_HAS_AEAD_CCM)
-BOTAN_REGISTER_BLOCK_CIPHER_MODE_LEN2(CCM_Encryption, CCM_Decryption, 16, 3);
+      }
 #endif
 
-#if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
-BOTAN_REGISTER_T_NOARGS(Cipher_Mode, ChaCha20Poly1305_Encryption);
-BOTAN_REGISTER_T_NOARGS(Cipher_Mode, ChaCha20Poly1305_Decryption);
-#endif
+   if(algo.find('/') != std::string::npos)
+      {
+      const std::vector<std::string> algo_parts = split_on(algo, '/');
+      const std::string cipher_name = algo_parts[0];
+      const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]);
 
-#if defined(BOTAN_HAS_AEAD_EAX)
-BOTAN_REGISTER_BLOCK_CIPHER_MODE_LEN(EAX_Encryption, EAX_Decryption, 0);
+      if(mode_info.empty())
+         return nullptr;
+
+      std::ostringstream alg_args;
+
+      alg_args << '(' << cipher_name;
+      for(size_t i = 1; i < mode_info.size(); ++i)
+         alg_args << ',' << mode_info[i];
+      for(size_t i = 2; i < algo_parts.size(); ++i)
+         alg_args << ',' << algo_parts[i];
+      alg_args << ')';
+
+      const std::string mode_name = mode_info[0] + alg_args.str();
+      return get_aead(mode_name, dir);
+      }
+
+#if defined(BOTAN_HAS_BLOCK_CIPHER)
+
+   SCAN_Name req(algo);
+   std::unique_ptr<BlockCipher> bc(BlockCipher::create(req.arg(0)));
+
+   if(!bc)
+      {
+      return nullptr;
+      }
+
+#if defined(BOTAN_HAS_AEAD_CCM)
+   if(req.algo_name() == "CCM")
+      {
+      size_t tag_len = req.arg_as_integer(1, 16);
+      size_t L_len = req.arg_as_integer(2, 3);
+      if(dir == ENCRYPTION)
+         return new CCM_Encryption(bc.release(), tag_len, L_len);
+      else
+         return new CCM_Decryption(bc.release(), tag_len, L_len);
+      }
 #endif
 
 #if defined(BOTAN_HAS_AEAD_GCM)
-BOTAN_REGISTER_BLOCK_CIPHER_MODE_LEN(GCM_Encryption, GCM_Decryption, 16);
+   if(req.algo_name() == "GCM")
+      {
+      size_t tag_len = req.arg_as_integer(1, 16);
+      if(dir == ENCRYPTION)
+         return new GCM_Encryption(bc.release(), tag_len);
+      else
+         return new GCM_Decryption(bc.release(), tag_len);
+      }
 #endif
 
 #if defined(BOTAN_HAS_AEAD_OCB)
-BOTAN_REGISTER_BLOCK_CIPHER_MODE_LEN(OCB_Encryption, OCB_Decryption, 16);
+   if(req.algo_name() == "OCB")
+      {
+      size_t tag_len = req.arg_as_integer(1, 16);
+      if(dir == ENCRYPTION)
+         return new OCB_Encryption(bc.release(), tag_len);
+      else
+         return new OCB_Decryption(bc.release(), tag_len);
+      }
 #endif
 
-#if defined(BOTAN_HAS_AEAD_SIV)
-BOTAN_REGISTER_BLOCK_CIPHER_MODE(SIV_Encryption, SIV_Decryption);
+#if defined(BOTAN_HAS_AEAD_EAX)
+   if(req.algo_name() == "EAX")
+      {
+      size_t tag_len = req.arg_as_integer(1, bc->block_size());
+      if(dir == ENCRYPTION)
+         return new EAX_Encryption(bc.release(), tag_len);
+      else
+         return new EAX_Decryption(bc.release(), tag_len);
+      }
 #endif
 
-AEAD_Mode* get_aead(const std::string& algo_spec, Cipher_Dir direction)
-   {
-   std::unique_ptr<Cipher_Mode> mode(get_cipher_mode(algo_spec, direction));
-
-   if(AEAD_Mode* aead = dynamic_cast<AEAD_Mode*>(mode.get()))
+#if defined(BOTAN_HAS_AEAD_SIV)
+   if(req.algo_name() == "SIV")
       {
-      mode.release();
-      return aead;
+      if(dir == ENCRYPTION)
+         return new SIV_Encryption(bc.release());
+      else
+         return new SIV_Decryption(bc.release());
       }
+#endif
+
+#endif
 
    return nullptr;
    }