Add Blake2b hash function

1 files changed, 56 insertions, 0 deletions

diff --git a/src/lib/hash/blake2/blake2b.h b/src/lib/hash/blake2/blake2b.h
new file mode 100644
index 000000000..d330c1452
--- /dev/null
+++ b/src/lib/hash/blake2/blake2b.h
@@ -0,0 +1,56 @@
+#ifndef BLAKE2B_H__
+#define BLAKE2B_H__
+
+#include <botan/hash.h>
+#include <string>
+#include <memory>
+
+namespace Botan {
+
+enum blake2b_constant {
+  BLAKE2B_BLOCKBYTES = 128,
+  BLAKE2B_OUTBYTES   = 64,
+  BLAKE2B_IVU64COUNT = 8
+};
+
+/**
+* BLAKE2B
+*/
+class BOTAN_DLL Blake2b final : public HashFunction
+   {
+   public:
+      /**
+      * @param output_bits the output size of Blake2b in bits
+      */
+      Blake2b(size_t output_bits = 512);
+
+      size_t hash_block_size() const override { return BLAKE2B_BLOCKBYTES; }
+      size_t output_length() const override { return m_output_bits / 8; }
+
+      static Blake2b* make(const Spec& spec);
+
+      HashFunction* clone() const override;
+      std::string name() const override;
+      void clear() override;
+
+   private:
+      void add_data(const byte input[], size_t length) override;
+      void final_result(byte out[]) override;
+
+      inline void state_init();
+      inline void increment_counter(const u64bit inc);
+      void compress(bool lastblock = false);
+
+      size_t m_output_bits;
+
+      secure_vector<byte> m_buffer;
+      size_t m_buflen;
+
+      secure_vector<u64bit> m_H;
+      u64bit m_T[2];
+      u64bit m_F[2];
+   };
+
+}
+
+#endif