diff options
Diffstat (limited to 'core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP192R1Point.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP192R1Point.java | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP192R1Point.java b/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP192R1Point.java deleted file mode 100644 index 3ed72f85..00000000 --- a/core/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP192R1Point.java +++ /dev/null @@ -1,310 +0,0 @@ -package org.bouncycastle.math.ec.custom.sec; - -import org.bouncycastle.math.ec.ECCurve; -import org.bouncycastle.math.ec.ECFieldElement; -import org.bouncycastle.math.ec.ECPoint; -import org.bouncycastle.math.raw.Nat; -import org.bouncycastle.math.raw.Nat192; - -public class SecP192R1Point extends ECPoint.AbstractFp -{ - /** - * Create a point which encodes with point compression. - * - * @param curve - * the curve to use - * @param x - * affine x co-ordinate - * @param y - * affine y co-ordinate - * - * @deprecated Use ECCurve.createPoint to construct points - */ - public SecP192R1Point(ECCurve curve, ECFieldElement x, ECFieldElement y) - { - this(curve, x, y, false); - } - - /** - * Create a point that encodes with or without point compresion. - * - * @param curve - * the curve to use - * @param x - * affine x co-ordinate - * @param y - * affine y co-ordinate - * @param withCompression - * if true encode with point compression - * - * @deprecated per-point compression property will be removed, refer - * {@link #getEncoded(boolean)} - */ - public SecP192R1Point(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; - } - - SecP192R1Point(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, boolean withCompression) - { - super(curve, x, y, zs); - - this.withCompression = withCompression; - } - - protected ECPoint detach() - { - return new SecP192R1Point(null, getAffineXCoord(), getAffineYCoord()); - } - - // B.3 pg 62 - public ECPoint add(ECPoint b) - { - if (this.isInfinity()) - { - return b; - } - if (b.isInfinity()) - { - return this; - } - if (this == b) - { - return twice(); - } - - ECCurve curve = this.getCurve(); - - SecP192R1FieldElement X1 = (SecP192R1FieldElement)this.x, Y1 = (SecP192R1FieldElement)this.y; - SecP192R1FieldElement X2 = (SecP192R1FieldElement)b.getXCoord(), Y2 = (SecP192R1FieldElement)b.getYCoord(); - - SecP192R1FieldElement Z1 = (SecP192R1FieldElement)this.zs[0]; - SecP192R1FieldElement Z2 = (SecP192R1FieldElement)b.getZCoord(0); - - int c; - int[] tt1 = Nat192.createExt(); - int[] t2 = Nat192.create(); - int[] t3 = Nat192.create(); - int[] t4 = Nat192.create(); - - boolean Z1IsOne = Z1.isOne(); - int[] U2, S2; - if (Z1IsOne) - { - U2 = X2.x; - S2 = Y2.x; - } - else - { - S2 = t3; - SecP192R1Field.square(Z1.x, S2); - - U2 = t2; - SecP192R1Field.multiply(S2, X2.x, U2); - - SecP192R1Field.multiply(S2, Z1.x, S2); - SecP192R1Field.multiply(S2, Y2.x, S2); - } - - boolean Z2IsOne = Z2.isOne(); - int[] U1, S1; - if (Z2IsOne) - { - U1 = X1.x; - S1 = Y1.x; - } - else - { - S1 = t4; - SecP192R1Field.square(Z2.x, S1); - - U1 = tt1; - SecP192R1Field.multiply(S1, X1.x, U1); - - SecP192R1Field.multiply(S1, Z2.x, S1); - SecP192R1Field.multiply(S1, Y1.x, S1); - } - - int[] H = Nat192.create(); - SecP192R1Field.subtract(U1, U2, H); - - int[] R = t2; - SecP192R1Field.subtract(S1, S2, R); - - // Check if b == this or b == -this - if (Nat192.isZero(H)) - { - if (Nat192.isZero(R)) - { - // this == b, i.e. this must be doubled - return this.twice(); - } - - // this == -b, i.e. the result is the point at infinity - return curve.getInfinity(); - } - - int[] HSquared = t3; - SecP192R1Field.square(H, HSquared); - - int[] G = Nat192.create(); - SecP192R1Field.multiply(HSquared, H, G); - - int[] V = t3; - SecP192R1Field.multiply(HSquared, U1, V); - - SecP192R1Field.negate(G, G); - Nat192.mul(S1, G, tt1); - - c = Nat192.addBothTo(V, V, G); - SecP192R1Field.reduce32(c, G); - - SecP192R1FieldElement X3 = new SecP192R1FieldElement(t4); - SecP192R1Field.square(R, X3.x); - SecP192R1Field.subtract(X3.x, G, X3.x); - - SecP192R1FieldElement Y3 = new SecP192R1FieldElement(G); - SecP192R1Field.subtract(V, X3.x, Y3.x); - SecP192R1Field.multiplyAddToExt(Y3.x, R, tt1); - SecP192R1Field.reduce(tt1, Y3.x); - - SecP192R1FieldElement Z3 = new SecP192R1FieldElement(H); - if (!Z1IsOne) - { - SecP192R1Field.multiply(Z3.x, Z1.x, Z3.x); - } - if (!Z2IsOne) - { - SecP192R1Field.multiply(Z3.x, Z2.x, Z3.x); - } - - ECFieldElement[] zs = new ECFieldElement[]{ Z3 }; - - return new SecP192R1Point(curve, X3, Y3, zs, this.withCompression); - } - - // B.3 pg 62 - public ECPoint twice() - { - if (this.isInfinity()) - { - return this; - } - - ECCurve curve = this.getCurve(); - - SecP192R1FieldElement Y1 = (SecP192R1FieldElement)this.y; - if (Y1.isZero()) - { - return curve.getInfinity(); - } - - SecP192R1FieldElement X1 = (SecP192R1FieldElement)this.x, Z1 = (SecP192R1FieldElement)this.zs[0]; - - int c; - int[] t1 = Nat192.create(); - int[] t2 = Nat192.create(); - - int[] Y1Squared = Nat192.create(); - SecP192R1Field.square(Y1.x, Y1Squared); - - int[] T = Nat192.create(); - SecP192R1Field.square(Y1Squared, T); - - boolean Z1IsOne = Z1.isOne(); - - int[] Z1Squared = Z1.x; - if (!Z1IsOne) - { - Z1Squared = t2; - SecP192R1Field.square(Z1.x, Z1Squared); - } - - SecP192R1Field.subtract(X1.x, Z1Squared, t1); - - int[] M = t2; - SecP192R1Field.add(X1.x, Z1Squared, M); - SecP192R1Field.multiply(M, t1, M); - c = Nat192.addBothTo(M, M, M); - SecP192R1Field.reduce32(c, M); - - int[] S = Y1Squared; - SecP192R1Field.multiply(Y1Squared, X1.x, S); - c = Nat.shiftUpBits(6, S, 2, 0); - SecP192R1Field.reduce32(c, S); - - c = Nat.shiftUpBits(6, T, 3, 0, t1); - SecP192R1Field.reduce32(c, t1); - - SecP192R1FieldElement X3 = new SecP192R1FieldElement(T); - SecP192R1Field.square(M, X3.x); - SecP192R1Field.subtract(X3.x, S, X3.x); - SecP192R1Field.subtract(X3.x, S, X3.x); - - SecP192R1FieldElement Y3 = new SecP192R1FieldElement(S); - SecP192R1Field.subtract(S, X3.x, Y3.x); - SecP192R1Field.multiply(Y3.x, M, Y3.x); - SecP192R1Field.subtract(Y3.x, t1, Y3.x); - - SecP192R1FieldElement Z3 = new SecP192R1FieldElement(M); - SecP192R1Field.twice(Y1.x, Z3.x); - if (!Z1IsOne) - { - SecP192R1Field.multiply(Z3.x, Z1.x, Z3.x); - } - - return new SecP192R1Point(curve, X3, Y3, new ECFieldElement[]{ Z3 }, this.withCompression); - } - - public ECPoint twicePlus(ECPoint b) - { - if (this == b) - { - return threeTimes(); - } - if (this.isInfinity()) - { - return b; - } - if (b.isInfinity()) - { - return twice(); - } - - ECFieldElement Y1 = this.y; - if (Y1.isZero()) - { - return b; - } - - return twice().add(b); - } - - public ECPoint threeTimes() - { - if (this.isInfinity() || this.y.isZero()) - { - return this; - } - - // NOTE: Be careful about recursions between twicePlus and threeTimes - return twice().add(this); - } - - public ECPoint negate() - { - if (this.isInfinity()) - { - return this; - } - - return new SecP192R1Point(curve, this.x, this.y.negate(), this.zs, this.withCompression); - } -} |