diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecT193R2Point.java')
-rw-r--r-- | bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecT193R2Point.java | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecT193R2Point.java b/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecT193R2Point.java deleted file mode 100644 index f3bbb706..00000000 --- a/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecT193R2Point.java +++ /dev/null @@ -1,308 +0,0 @@ -package org.bouncycastle.math.ec.custom.sec; - -import org.bouncycastle.math.ec.ECConstants; -import org.bouncycastle.math.ec.ECCurve; -import org.bouncycastle.math.ec.ECFieldElement; -import org.bouncycastle.math.ec.ECPoint; -import org.bouncycastle.math.ec.ECPoint.AbstractF2m; - -public class SecT193R2Point extends AbstractF2m -{ - /** - * @deprecated Use ECCurve.createPoint to construct points - */ - public SecT193R2Point(ECCurve curve, ECFieldElement x, ECFieldElement y) - { - this(curve, x, y, false); - } - - /** - * @deprecated per-point compression property will be removed, refer {@link #getEncoded(boolean)} - */ - public SecT193R2Point(ECCurve curve, ECFieldElement x, ECFieldElement y, boolean withCompression) - { - super(curve, x, y); - - if ((x == null) != (y == null)) - { - throw new IllegalArgumentException("Exactly one of the field elements is null"); - } - - this.withCompression = withCompression; - } - - SecT193R2Point(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, boolean withCompression) - { - super(curve, x, y, zs); - - this.withCompression = withCompression; - } - - protected ECPoint detach() - { - return new SecT193R2Point(null, getAffineXCoord(), getAffineYCoord()); - } - - public ECFieldElement getYCoord() - { - ECFieldElement X = x, L = y; - - if (this.isInfinity() || X.isZero()) - { - return L; - } - - // Y is actually Lambda (X + Y/X) here; convert to affine value on the fly - ECFieldElement Y = L.add(X).multiply(X); - - ECFieldElement Z = zs[0]; - if (!Z.isOne()) - { - Y = Y.divide(Z); - } - - return Y; - } - - protected boolean getCompressionYTilde() - { - ECFieldElement X = this.getRawXCoord(); - if (X.isZero()) - { - return false; - } - - ECFieldElement Y = this.getRawYCoord(); - - // Y is actually Lambda (X + Y/X) here - return Y.testBitZero() != X.testBitZero(); - } - - public ECPoint add(ECPoint b) - { - if (this.isInfinity()) - { - return b; - } - if (b.isInfinity()) - { - return this; - } - - ECCurve curve = this.getCurve(); - - ECFieldElement X1 = this.x; - ECFieldElement X2 = b.getRawXCoord(); - - if (X1.isZero()) - { - if (X2.isZero()) - { - return curve.getInfinity(); - } - - return b.add(this); - } - - ECFieldElement L1 = this.y, Z1 = this.zs[0]; - ECFieldElement L2 = b.getRawYCoord(), Z2 = b.getZCoord(0); - - boolean Z1IsOne = Z1.isOne(); - ECFieldElement U2 = X2, S2 = L2; - if (!Z1IsOne) - { - U2 = U2.multiply(Z1); - S2 = S2.multiply(Z1); - } - - boolean Z2IsOne = Z2.isOne(); - ECFieldElement U1 = X1, S1 = L1; - if (!Z2IsOne) - { - U1 = U1.multiply(Z2); - S1 = S1.multiply(Z2); - } - - ECFieldElement A = S1.add(S2); - ECFieldElement B = U1.add(U2); - - if (B.isZero()) - { - if (A.isZero()) - { - return twice(); - } - - return curve.getInfinity(); - } - - ECFieldElement X3, L3, Z3; - if (X2.isZero()) - { - // TODO This can probably be optimized quite a bit - ECPoint p = this.normalize(); - X1 = p.getXCoord(); - ECFieldElement Y1 = p.getYCoord(); - - ECFieldElement Y2 = L2; - ECFieldElement L = Y1.add(Y2).divide(X1); - - X3 = L.square().add(L).add(X1).add(curve.getA()); - if (X3.isZero()) - { - return new SecT193R2Point(curve, X3, curve.getB().sqrt(), this.withCompression); - } - - ECFieldElement Y3 = L.multiply(X1.add(X3)).add(X3).add(Y1); - L3 = Y3.divide(X3).add(X3); - Z3 = curve.fromBigInteger(ECConstants.ONE); - } - else - { - B = B.square(); - - ECFieldElement AU1 = A.multiply(U1); - ECFieldElement AU2 = A.multiply(U2); - - X3 = AU1.multiply(AU2); - if (X3.isZero()) - { - return new SecT193R2Point(curve, X3, curve.getB().sqrt(), this.withCompression); - } - - ECFieldElement ABZ2 = A.multiply(B); - if (!Z2IsOne) - { - ABZ2 = ABZ2.multiply(Z2); - } - - L3 = AU2.add(B).squarePlusProduct(ABZ2, L1.add(Z1)); - - Z3 = ABZ2; - if (!Z1IsOne) - { - Z3 = Z3.multiply(Z1); - } - } - - return new SecT193R2Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression); - } - - public ECPoint twice() - { - if (this.isInfinity()) - { - return this; - } - - ECCurve curve = this.getCurve(); - - ECFieldElement X1 = this.x; - if (X1.isZero()) - { - // A point with X == 0 is it's own additive inverse - return curve.getInfinity(); - } - - ECFieldElement L1 = this.y, Z1 = this.zs[0]; - - boolean Z1IsOne = Z1.isOne(); - ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.multiply(Z1); - ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.square(); - ECFieldElement a = curve.getA(); - ECFieldElement aZ1Sq = Z1IsOne ? a : a.multiply(Z1Sq); - ECFieldElement T = L1.square().add(L1Z1).add(aZ1Sq); - if (T.isZero()) - { - return new SecT193R2Point(curve, T, curve.getB().sqrt(), withCompression); - } - - ECFieldElement X3 = T.square(); - ECFieldElement Z3 = Z1IsOne ? T : T.multiply(Z1Sq); - - ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.multiply(Z1); - ECFieldElement L3 = X1Z1.squarePlusProduct(T, L1Z1).add(X3).add(Z3); - - return new SecT193R2Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression); - } - - public ECPoint twicePlus(ECPoint b) - { - if (this.isInfinity()) - { - return b; - } - if (b.isInfinity()) - { - return twice(); - } - - ECCurve curve = this.getCurve(); - - ECFieldElement X1 = this.x; - if (X1.isZero()) - { - // A point with X == 0 is it's own additive inverse - return b; - } - - ECFieldElement X2 = b.getRawXCoord(), Z2 = b.getZCoord(0); - if (X2.isZero() || !Z2.isOne()) - { - return twice().add(b); - } - - ECFieldElement L1 = this.y, Z1 = this.zs[0]; - ECFieldElement L2 = b.getRawYCoord(); - - ECFieldElement X1Sq = X1.square(); - ECFieldElement L1Sq = L1.square(); - ECFieldElement Z1Sq = Z1.square(); - ECFieldElement L1Z1 = L1.multiply(Z1); - - ECFieldElement T = curve.getA().multiply(Z1Sq).add(L1Sq).add(L1Z1); - ECFieldElement L2plus1 = L2.addOne(); - ECFieldElement A = curve.getA().add(L2plus1).multiply(Z1Sq).add(L1Sq).multiplyPlusProduct(T, X1Sq, Z1Sq); - ECFieldElement X2Z1Sq = X2.multiply(Z1Sq); - ECFieldElement B = X2Z1Sq.add(T).square(); - - if (B.isZero()) - { - if (A.isZero()) - { - return b.twice(); - } - - return curve.getInfinity(); - } - - if (A.isZero()) - { - return new SecT193R2Point(curve, A, curve.getB().sqrt(), withCompression); - } - - ECFieldElement X3 = A.square().multiply(X2Z1Sq); - ECFieldElement Z3 = A.multiply(B).multiply(Z1Sq); - ECFieldElement L3 = A.add(B).square().multiplyPlusProduct(T, L2plus1, Z3); - - return new SecT193R2Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression); - } - - public ECPoint negate() - { - if (this.isInfinity()) - { - return this; - } - - ECFieldElement X = this.x; - if (X.isZero()) - { - return this; - } - - // L is actually Lambda (X + Y/X) here - ECFieldElement L = this.y, Z = this.zs[0]; - return new SecT193R2Point(curve, X, L.add(Z), new ECFieldElement[]{ Z }, this.withCompression); - } -} |