From 9399030a9a95a232444a885b75f8466f679a340a Mon Sep 17 00:00:00 2001
From: Gabriel Tofvesson <gabriel.tofvesson@gmail.com>
Date: Wed, 28 Feb 2018 02:38:29 +0100
Subject: [PATCH] Started implementing Galois class
---
XMath/Galois.h | 70 ++++++++++++++++++++++++++++++++++++++++----------
1 file changed, 57 insertions(+), 13 deletions(-)
diff --git a/XMath/Galois.h b/XMath/Galois.h
index d238355..8adfe2d 100644
--- a/XMath/Galois.h
+++ b/XMath/Galois.h
@@ -1,29 +1,73 @@
#pragma once
+#if defined(__MINGW32__) || defined(_WIN32)
+
+#if defined(GALOIS_API)
+#define GALOIS_API __declspec(dllexport)
+#else
+#define GALOIS_API __declspec(dllimport)
+#endif
+
+#endif
+
+#ifndef GALOIS_API
+ #if __GNUC__ >= 4
+ #define GALOIS_API __attribute__ ((visibility ("default")))
+ #else
+ #define GALOIS_API
+ #endif
+#endif
+
+
namespace CryptoCPP {
namespace Math {
class Galois
{
public:
- Galois(size_t characteristic, size_t exponent, size_t irreducible);
+ GALOIS_API Galois(
+ size_t characteristic,
+ size_t exponent,
+ size_t * irreducible,
+ size_t irreducible_size,
+ size_t * value
+ );
+ GALOIS_API ~Galois();
- Galois * add(const Galois * value) const; // Add
- Galois * sub(const Galois * value) const; // Subtract
- Galois * mul(const Galois * value) const; // Multiply
- Galois * inv(const Galois * value) const; // Inverse multiply
+ // Addition
+ GALOIS_API Galois * add(const Galois * value) const;
+
+ // Subtraction
+ GALOIS_API Galois * sub(const Galois * value) const;
+
+ // Multiplication
+ GALOIS_API Galois * mul(const Galois * value) const;
+
+ // Inverse multiplication
+ GALOIS_API Galois * inv(const Galois * value) const;
protected:
- size_t characteristic, exponent, irreducible;
+ static const size_t high_bit = 1 << ((sizeof(size_t)*8)-1);
+ // GF parameters
+ const size_t characteristic, exponent, irreducible;
+ // Effective storage params
+ const size_t binary_block_size, data_size;
+ // Value of this GF object
+ const size_t * data;
- // Reduce the value of this galois to one that fits the field parameters
- void reduce();
+
+ // Reduce the value of this galois to fit characteristic
+ GALOIS_API void reduce();
// Self-mutable operations
- void iadd(const Galois * value);
- void isub(const Galois * value);
- void imul(const Galois * value);
- void iinv(const Galois * value);
+ GALOIS_API void iadd(const Galois * value);
+ GALOIS_API void isub(const Galois * value);
+ GALOIS_API void imul(const Galois * value);
+ GALOIS_API void iinv(const Galois * value);
+
+ GALOIS_API size_t _mask(size_t bits, bool side) const;
+ GALOIS_API size_t get_value(size_t idx) const;
+ GALOIS_API void set_value(size_t idx, size_t value);
};
}
-}
\ No newline at end of file
+}