From 2d1dd244a6714687c97736a809e9dd31f506306c Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Thu, 25 Feb 2010 02:01:06 +0000
Subject: Convert PointGFp::get_affine_{x,y} to return just the BigInt value

---
 src/math/gfpmath/point_gfp.cpp | 28 +++++++++++++++++-----------
 src/math/gfpmath/point_gfp.h   |  4 ++--
 2 files changed, 19 insertions(+), 13 deletions(-)

(limited to 'src/math')

diff --git a/src/math/gfpmath/point_gfp.cpp b/src/math/gfpmath/point_gfp.cpp
index e32cd14d8..f76853085 100644
--- a/src/math/gfpmath/point_gfp.cpp
+++ b/src/math/gfpmath/point_gfp.cpp
@@ -278,22 +278,28 @@ const PointGFp& PointGFp::set_z_to_one()
    return *this;
    }
 
-GFpElement PointGFp::get_affine_x() const
+BigInt PointGFp::get_affine_x() const
    {
    if(is_zero())
       throw Illegal_Transformation("cannot convert to affine");
 
    GFpElement z2 = mZ * mZ;
-   return mX * z2.inverse_in_place();
+   z2.inverse_in_place();
+   z2 *= mX;
+
+   return z2.get_value();
    }
 
-GFpElement PointGFp::get_affine_y() const
+BigInt PointGFp::get_affine_y() const
    {
    if(is_zero())
       throw Illegal_Transformation("cannot convert to affine");
 
    GFpElement z3 = mZ * mZ * mZ;
-   return mY * z3.inverse_in_place();
+   z3.inverse_in_place();
+   z3 *= mY;
+
+   return z3.get_value();
    }
 
 // Is this the point at infinity?
@@ -385,7 +391,7 @@ PointGFp operator*(const PointGFp& point, const BigInt& scalar)
 SecureVector<byte> EC2OSP(const PointGFp& point, byte format)
    {
    if(format == PointGFp::UNCOMPRESSED)
-      return result = encode_uncompressed(point);
+      return encode_uncompressed(point);
    else if(format == PointGFp::COMPRESSED)
       return encode_compressed(point);
    else if(format == PointGFp::HYBRID)
@@ -412,10 +418,10 @@ SecureVector<byte> encode_compressed(const PointGFp& point)
    l /= 8;
    SecureVector<byte> result (l+1);
    result[0] = 2;
-   BigInt x = point.get_affine_x().get_value();
+   BigInt x = point.get_affine_x();
    SecureVector<byte> bX = BigInt::encode_1363(x, l);
    result.copy(1, bX.begin(), bX.size());
-   BigInt y = point.get_affine_y().get_value();
+   BigInt y = point.get_affine_y();
    if(y.get_bit(0))
       {
       result[0] |= 1;
@@ -440,8 +446,8 @@ SecureVector<byte> encode_uncompressed(const PointGFp& point)
    l /= 8;
    SecureVector<byte> result (2*l+1);
    result[0] = 4;
-   BigInt x = point.get_affine_x().get_value();
-   BigInt y = point.get_affine_y().get_value();
+   BigInt x = point.get_affine_x();
+   BigInt y = point.get_affine_y();
    SecureVector<byte> bX = BigInt::encode_1363(x, l);
    SecureVector<byte> bY = BigInt::encode_1363(y, l);
    result.copy(1, bX.begin(), l);
@@ -467,8 +473,8 @@ SecureVector<byte> encode_hybrid(const PointGFp& point)
    l /= 8;
    SecureVector<byte> result (2*l+1);
    result[0] = 6;
-   BigInt x = point.get_affine_x().get_value();
-   BigInt y = point.get_affine_y().get_value();
+   BigInt x = point.get_affine_x();
+   BigInt y = point.get_affine_y();
    SecureVector<byte> bX = BigInt::encode_1363(x, l);
    SecureVector<byte> bY = BigInt::encode_1363(y, l);
    result.copy(1, bX.begin(), bX.size());
diff --git a/src/math/gfpmath/point_gfp.h b/src/math/gfpmath/point_gfp.h
index 9c67ae53c..9f29896cb 100644
--- a/src/math/gfpmath/point_gfp.h
+++ b/src/math/gfpmath/point_gfp.h
@@ -121,13 +121,13 @@ class BOTAN_DLL PointGFp
       * get affine x coordinate
       * @result affine x coordinate
       */
-      GFpElement get_affine_x() const;
+      BigInt get_affine_x() const;
 
       /**
       * get affine y coordinate
       * @result affine y coordinate
       */
-      GFpElement get_affine_y() const;
+      BigInt get_affine_y() const;
 
       /**
       * get the jacobian projective x coordinate
-- 
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