1 files changed, 72 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/hash/skein/skein_512.h b/comm/third_party/botan/src/lib/hash/skein/skein_512.h
new file mode 100644
index 0000000000..0bf173cebd
--- /dev/null
+++ b/comm/third_party/botan/src/lib/hash/skein/skein_512.h
@@ -0,0 +1,72 @@
+/*
+* The Skein-512 hash function
+* (C) 2009,2014 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_SKEIN_512_H_
+#define BOTAN_SKEIN_512_H_
+
+#include <botan/hash.h>
+#include <botan/threefish_512.h>
+#include <string>
+#include <memory>
+
+BOTAN_FUTURE_INTERNAL_HEADER(skin_512.h)
+
+namespace Botan {
+
+/**
+* Skein-512, a SHA-3 candidate
+*/
+class BOTAN_PUBLIC_API(2,0) Skein_512 final : public HashFunction
+   {
+   public:
+      /**
+      * @param output_bits the output size of Skein in bits
+      * @param personalization is a string that will parameterize the
+      * hash output
+      */
+      Skein_512(size_t output_bits = 512,
+                const std::string& personalization = "");
+
+      size_t hash_block_size() const override { return 64; }
+      size_t output_length() const override { return m_output_bits / 8; }
+
+      HashFunction* clone() const override;
+      std::unique_ptr<HashFunction> copy_state() const override;
+      std::string name() const override;
+      void clear() override;
+   private:
+      enum type_code {
+         SKEIN_KEY = 0,
+         SKEIN_CONFIG = 4,
+         SKEIN_PERSONALIZATION = 8,
+         SKEIN_PUBLIC_KEY = 12,
+         SKEIN_KEY_IDENTIFIER = 16,
+         SKEIN_NONCE = 20,
+         SKEIN_MSG = 48,
+         SKEIN_OUTPUT = 63
+      };
+
+      void add_data(const uint8_t input[], size_t length) override;
+      void final_result(uint8_t out[]) override;
+
+      void ubi_512(const uint8_t msg[], size_t msg_len);
+
+      void initial_block();
+      void reset_tweak(type_code type, bool is_final);
+
+      std::string m_personalization;
+      size_t m_output_bits;
+
+      std::unique_ptr<Threefish_512> m_threefish;
+      secure_vector<uint64_t> m_T;
+      secure_vector<uint8_t> m_buffer;
+      size_t m_buf_pos;
+   };
+
+}
+
+#endif