3 files changed, 142 insertions, 0 deletions
diff --git a/lib/hash/par_hash/info.txt b/lib/hash/par_hash/info.txt
new file mode 100644
index 000000000..4f559b545
--- /dev/null
+++ b/lib/hash/par_hash/info.txt
@@ -0,0 +1 @@
+define PARALLEL_HASH 20131128
diff --git a/lib/hash/par_hash/par_hash.cpp b/lib/hash/par_hash/par_hash.cpp
new file mode 100644
index 000000000..df47780ef
--- /dev/null
+++ b/lib/hash/par_hash/par_hash.cpp
@@ -0,0 +1,100 @@
+/*
+* Parallel
+* (C) 1999-2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/par_hash.h>
+#include <botan/parsing.h>
+
+namespace Botan {
+
+/*
+* Update the hash
+*/
+void Parallel::add_data(const byte input[], size_t length)
+   {
+   for(auto hash : hashes)
+       hash->update(input, length);
+   }
+
+/*
+* Finalize the hash
+*/
+void Parallel::final_result(byte out[])
+   {
+   u32bit offset = 0;
+
+   for(auto hash : hashes)
+      {
+      hash->final(out + offset);
+      offset += hash->output_length();
+      }
+   }
+
+/*
+* Return output size
+*/
+size_t Parallel::output_length() const
+   {
+   size_t sum = 0;
+
+   for(auto hash : hashes)
+      sum += hash->output_length();
+   return sum;
+   }
+
+/*
+* Return the name of this type
+*/
+std::string Parallel::name() const
+   {
+   std::vector<std::string> names;
+
+   for(auto hash : hashes)
+      names.push_back(hash->name());
+
+   return "Parallel(" + string_join(names, ',') + ")";
+   }
+
+/*
+* Return a clone of this object
+*/
+HashFunction* Parallel::clone() const
+   {
+   std::vector<HashFunction*> hash_copies;
+
+   for(auto hash : hashes)
+      hash_copies.push_back(hash->clone());
+
+   return new Parallel(hash_copies);
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void Parallel::clear()
+   {
+   for(auto hash : hashes)
+      hash->clear();
+   }
+
+/*
+* Parallel Constructor
+*/
+Parallel::Parallel(const std::vector<HashFunction*>& hash_in) :
+   hashes(hash_in)
+   {
+   }
+
+/*
+* Parallel Destructor
+*/
+Parallel::~Parallel()
+   {
+   for(auto hash : hashes)
+      delete hash;
+   }
+
+}
diff --git a/lib/hash/par_hash/par_hash.h b/lib/hash/par_hash/par_hash.h
new file mode 100644
index 000000000..4f5395c23
--- /dev/null
+++ b/lib/hash/par_hash/par_hash.h
@@ -0,0 +1,41 @@
+/*
+* Parallel Hash
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_PARALLEL_HASH_H__
+#define BOTAN_PARALLEL_HASH_H__
+
+#include <botan/hash.h>
+#include <vector>
+
+namespace Botan {
+
+/**
+* Parallel Hashes
+*/
+class BOTAN_DLL Parallel : public HashFunction
+   {
+   public:
+      void clear();
+      std::string name() const;
+      HashFunction* clone() const;
+
+      size_t output_length() const;
+
+      /**
+      * @param hashes a set of hashes to compute in parallel
+      */
+      Parallel(const std::vector<HashFunction*>& hashes);
+      ~Parallel();
+   private:
+      void add_data(const byte[], size_t);
+      void final_result(byte[]);
+      std::vector<HashFunction*> hashes;
+   };
+
+}
+
+#endif