Source tree reorganization

src/group.h

@@ -0,0 +1,113 @@
+#ifndef _SECP256K1_GROUP_
+#define _SECP256K1_GROUP_
+
+#include <string>
+
+#include "num.h"
+#include "field.h"
+
+namespace secp256k1 {
+
+class GroupElemJac;
+
+/** Defines a point on the secp256k1 curve (y^2 = x^3 + 7) */
+class GroupElem {
+protected:
+    bool fInfinity;
+    secp256k1_fe_t x;
+    secp256k1_fe_t y;
+
+public:
+
+    /** Creates the point at infinity */
+    GroupElem();
+
+    /** Creates the point with given affine coordinates */
+    GroupElem(const secp256k1_fe_t &xin, const secp256k1_fe_t &yin);
+
+    /** Checks whether this is the point at infinity */
+    bool IsInfinity() const;
+
+    void SetNeg(const GroupElem &p);
+
+    void GetX(secp256k1_fe_t &xout);
+
+    void GetY(secp256k1_fe_t &yout);
+
+    std::string ToString() const;
+
+    void SetJac(GroupElemJac &jac);
+
+    friend class GroupElemJac;
+};
+
+/** Represents a point on the secp256k1 curve, with jacobian coordinates */
+class GroupElemJac : private GroupElem {
+protected:
+    secp256k1_fe_t z;
+
+public:
+    /** Creates the point at infinity */
+    GroupElemJac();
+
+    /** Creates the point with given affine coordinates */
+    GroupElemJac(const secp256k1_fe_t &xin, const secp256k1_fe_t &yin);
+
+    GroupElemJac(const GroupElem &in);
+
+    void SetJac(const GroupElemJac &jac);
+
+    void SetAffine(const GroupElem &aff);
+
+    /** Checks whether this is a non-infinite point on the curve */
+    bool IsValid() const;
+
+    /** Returns the affine coordinates of this point */
+    void GetAffine(GroupElem &aff);
+
+    void GetX(secp256k1_fe_t &xout);
+    void GetY(secp256k1_fe_t &yout);
+
+    bool IsInfinity() const;
+
+    void SetNeg(const GroupElemJac &p);
+
+    /** Sets this point to have a given X coordinate & given Y oddness */
+    void SetCompressed(const secp256k1_fe_t &xin, bool fOdd);
+
+    /** Sets this point to be the EC double of another */
+    void SetDouble(const GroupElemJac &p);
+
+    /** Sets this point to be the EC addition of two others */
+    void SetAdd(const GroupElemJac &p, const GroupElemJac &q);
+
+    /** Sets this point to be the EC addition of two others (one of which is in affine coordinates) */
+    void SetAdd(const GroupElemJac &p, const GroupElem &q);
+
+    std::string ToString() const;
+
+    void SetMulLambda(const GroupElemJac &p);
+};
+
+class GroupConstants {
+private:
+    secp256k1_fe_t g_x;
+    secp256k1_fe_t g_y;
+
+public:
+    secp256k1_num_t order;
+    GroupElem g;
+    secp256k1_fe_t beta;
+    secp256k1_num_t lambda, a1b2, b1, a2;
+
+    GroupConstants();
+    ~GroupConstants();
+};
+
+const GroupConstants &GetGroupConst();
+
+void SplitExp(const secp256k1_num_t &exp, secp256k1_num_t &exp1, secp256k1_num_t &exp2);
+
+}
+
+#endif