Implement 'create' operation, add seeding

Seeding is currently only done on the key you specify, in the future
the user should request data that it can seed.

1 files changed, 46 insertions, 0 deletions

diff --git a/include/Hash.hpp b/include/Hash.hpp
new file mode 100644
index 0000000..d7c90b0
--- /dev/null
+++ b/include/Hash.hpp
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "utils.hpp"
+#include <sodium/crypto_generichash_blake2b.h>
+#include <stdexcept>
+#include <unordered_map>
+
+namespace odhtdb
+{
+    const int HASH_BYTE_SIZE = 32;
+    
+    class HashException : public std::runtime_error
+    {
+    public:
+        HashException(const std::string &errMsg) : std::runtime_error(errMsg) {}
+    };
+    
+    class Hash
+    {
+    public:
+        Hash();
+        // Throws HashException on failure
+        Hash(const void *input, const size_t inputSize);
+        
+        void* getData() const { return (void*)data; }
+        size_t getSize() const { return HASH_BYTE_SIZE; }
+        
+        size_t operator()() const;
+        bool operator==(const Hash &other) const;
+        
+        std::string toString() const;
+    private:
+        char data[HASH_BYTE_SIZE];
+    };
+    
+    struct HashHasher
+    {
+        size_t operator()(const Hash &hash) const
+        {
+            return hash();
+        }
+    };
+    
+    template <typename ValueType>
+    using MapHashKey = std::unordered_map<Hash, ValueType, HashHasher>;
+}