Remove algo factory, engines, global RNG, global state, etc.

Convert all uses of Algorithm_Factory and the engines to using Algo_Registry

The shared pool of entropy sources remains but is moved to EntropySource.
With that and few remaining initializations (default OIDs and aliases)
moved elsewhere, the global state is empty and init and shutdown are no-ops.
Remove almost all of the headers and code for handling the global
state, except LibraryInitializer which remains as a compatability stub.

Update seeding for blinding so only one hacky almost-global RNG
instance needs to be setup instead of across all pubkey uses (it uses
either the system RNG or an AutoSeeded_RNG if the system RNG is not
available).

1 files changed, 182 insertions, 0 deletions

diff --git a/src/lib/base/transform.h b/src/lib/base/transform.h
new file mode 100644
index 000000000..75bd5004a
--- /dev/null
+++ b/src/lib/base/transform.h
@@ -0,0 +1,182 @@
+/*
+* Transforms of data
+* (C) 2013 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_TRANSFORM_H__
+#define BOTAN_TRANSFORM_H__
+
+#include <botan/secmem.h>
+#include <botan/key_spec.h>
+#include <botan/exceptn.h>
+#include <botan/symkey.h>
+#include <botan/scan_name.h>
+#include <string>
+#include <vector>
+
+namespace Botan {
+
+/**
+* Interface for general transformations on data
+*/
+class BOTAN_DLL Transform
+   {
+   public:
+      typedef SCAN_Name Spec;
+
+      /**
+      * Begin processing a message.
+      * @param nonce the per message nonce
+      */
+      template<typename Alloc>
+      secure_vector<byte> start(const std::vector<byte, Alloc>& nonce)
+         {
+         return start(&nonce[0], nonce.size());
+         }
+
+      /**
+      * Begin processing a message.
+      * @param nonce the per message nonce
+      */
+      template<typename Alloc>
+      BOTAN_DEPRECATED("Use Transform::start")
+      secure_vector<byte> start_vec(const std::vector<byte, Alloc>& nonce)
+         {
+         return start(&nonce[0], nonce.size());
+         }
+
+      /**
+      * Begin processing a message.
+      * @param nonce the per message nonce
+      * @param nonce_len length of nonce
+      */
+      secure_vector<byte> start(const byte nonce[], size_t nonce_len)
+         {
+         return start_raw(nonce, nonce_len);
+         }
+
+      /**
+      * Begin processing a message.
+      */
+      secure_vector<byte> start()
+         {
+         return start_raw(nullptr, 0);
+         }
+
+      virtual secure_vector<byte> start_raw(const byte nonce[], size_t nonce_len) = 0;
+
+      /**
+      * Process some data. Input must be in size update_granularity() byte blocks.
+      * @param blocks in/out paramter which will possibly be resized
+      * @param offset an offset into blocks to begin processing
+      */
+      virtual void update(secure_vector<byte>& blocks, size_t offset = 0) = 0;
+
+      /**
+      * Complete processing of a message.
+      *
+      * @param final_block in/out parameter which must be at least
+      *        minimum_final_size() bytes, and will be set to any final output
+      * @param offset an offset into final_block to begin processing
+      */
+      virtual void finish(secure_vector<byte>& final_block, size_t offset = 0) = 0;
+
+      /**
+      * Returns the size of the output if this transform is used to process a
+      * message with input_length bytes. Will throw if unable to give a precise
+      * answer.
+      */
+      virtual size_t output_length(size_t input_length) const = 0;
+
+      /**
+      * @return size of required blocks to update
+      */
+      virtual size_t update_granularity() const = 0;
+
+      /**
+      * @return required minimium size to finalize() - may be any
+      *         length larger than this.
+      */
+      virtual size_t minimum_final_size() const = 0;
+
+      /**
+      * Return the default size for a nonce
+      */
+      virtual size_t default_nonce_length() const = 0;
+
+      /**
+      * Return true iff nonce_len is a valid length for the nonce
+      */
+      virtual bool valid_nonce_length(size_t nonce_len) const = 0;
+
+      /**
+      * Return some short name describing the provider of this tranformation.
+      * Useful in cases where multiple implementations are available (eg,
+      * different implementations of AES). Default "core" is used for the
+      * 'standard' implementation included in the library.
+      */
+      virtual std::string provider() const { return "core"; }
+
+      virtual std::string name() const = 0;
+
+      virtual void clear() = 0;
+
+      virtual ~Transform() {}
+   };
+
+class BOTAN_DLL Keyed_Transform : public Transform
+   {
+   public:
+      /**
+      * @return object describing limits on key size
+      */
+      virtual Key_Length_Specification key_spec() const = 0;
+
+      /**
+      * Check whether a given key length is valid for this algorithm.
+      * @param length the key length to be checked.
+      * @return true if the key length is valid.
+      */
+      bool valid_keylength(size_t length) const
+         {
+         return key_spec().valid_keylength(length);
+         }
+
+      template<typename Alloc>
+      void set_key(const std::vector<byte, Alloc>& key)
+         {
+         set_key(&key[0], key.size());
+         }
+
+      void set_key(const SymmetricKey& key)
+         {
+         set_key(key.begin(), key.length());
+         }
+
+      /**
+      * Set the symmetric key of this transform
+      * @param key contains the key material
+      * @param length in bytes of key param
+      */
+      void set_key(const byte key[], size_t length)
+         {
+         if(!valid_keylength(length))
+            throw Invalid_Key_Length(name(), length);
+         key_schedule(key, length);
+         }
+
+   private:
+      virtual void key_schedule(const byte key[], size_t length) = 0;
+   };
+
+typedef Transform Transformation;
+
+BOTAN_DLL Transform* get_transform(const std::string& specstr,
+                                   const std::string& provider = "",
+                                   const std::string& dirstr = "");
+
+}
+
+#endif