Update hashing library (#384)

third_party/hashing/hashers/sha1.h

@@ -1,6 +1,6 @@
 // //////////////////////////////////////////////////////////
 // sha1.h
-// Copyright (c) 2014 Stephan Brumme. All rights reserved.
+// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
 // see http://create.stephan-brumme.com/disclaimer.html
 //
 
@@ -24,6 +24,9 @@
 class SHA1 //: public Hash
 {
 public:
+  /// split into 64 byte blocks (=> 512 bits), hash is 20 bytes long
+  enum { BlockSize = 512 / 8, HashBytes = 20 };
+
   /// same as reset()
   SHA1();
 
@@ -35,8 +38,10 @@ public:
   /// add arbitrary number of bytes
   void add(const void* data, size_t numBytes);
 
-  /// return latest hash as 16 hex characters
+  /// return latest hash as 40 hex characters
   const char* getHash();
+  /// return latest hash as bytes
+  void        getHash(unsigned char buffer[HashBytes]);
 
   /// restart
   void reset();
@@ -47,15 +52,14 @@ private:
   /// process everything left in the internal buffer
   void processBuffer();
 
-  /// split into 64 byte blocks (=> 512 bits)
-  enum { BlockSize = 512 / 8, HashValues = 5 };
-
   /// size of processed data in bytes
   uint64_t m_numBytes;
   /// valid bytes in m_buffer
   size_t   m_bufferSize;
   /// bytes not processed yet
   uint8_t  m_buffer[BlockSize];
+
+  enum { HashValues = HashBytes / 4 };
   /// hash, stored as integers
   uint32_t m_hash[HashValues];
 };