| package org.bouncycastle.math.ec.custom.sec; |
| |
| import java.math.BigInteger; |
| |
| import org.bouncycastle.math.ec.ECFieldElement; |
| import org.bouncycastle.math.raw.Nat576; |
| import org.bouncycastle.util.Arrays; |
| |
| public class SecT571FieldElement extends ECFieldElement |
| { |
| protected long[] x; |
| |
| public SecT571FieldElement(BigInteger x) |
| { |
| if (x == null || x.signum() < 0 || x.bitLength() > 571) |
| { |
| throw new IllegalArgumentException("x value invalid for SecT571FieldElement"); |
| } |
| |
| this.x = SecT571Field.fromBigInteger(x); |
| } |
| |
| public SecT571FieldElement() |
| { |
| this.x = Nat576.create64(); |
| } |
| |
| protected SecT571FieldElement(long[] x) |
| { |
| this.x = x; |
| } |
| |
| // public int bitLength() |
| // { |
| // return x.degree(); |
| // } |
| |
| public boolean isOne() |
| { |
| return Nat576.isOne64(x); |
| } |
| |
| public boolean isZero() |
| { |
| return Nat576.isZero64(x); |
| } |
| |
| public boolean testBitZero() |
| { |
| return (x[0] & 1L) != 0L; |
| } |
| |
| public BigInteger toBigInteger() |
| { |
| return Nat576.toBigInteger64(x); |
| } |
| |
| public String getFieldName() |
| { |
| return "SecT571Field"; |
| } |
| |
| public int getFieldSize() |
| { |
| return 571; |
| } |
| |
| public ECFieldElement add(ECFieldElement b) |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.add(x, ((SecT571FieldElement)b).x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement addOne() |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.addOne(x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement subtract(ECFieldElement b) |
| { |
| // Addition and subtraction are the same in F2m |
| return add(b); |
| } |
| |
| public ECFieldElement multiply(ECFieldElement b) |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.multiply(x, ((SecT571FieldElement)b).x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement multiplyMinusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y) |
| { |
| return multiplyPlusProduct(b, x, y); |
| } |
| |
| public ECFieldElement multiplyPlusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y) |
| { |
| long[] ax = this.x, bx = ((SecT571FieldElement)b).x; |
| long[] xx = ((SecT571FieldElement)x).x, yx = ((SecT571FieldElement)y).x; |
| |
| long[] tt = Nat576.createExt64(); |
| SecT571Field.multiplyAddToExt(ax, bx, tt); |
| SecT571Field.multiplyAddToExt(xx, yx, tt); |
| |
| long[] z = Nat576.create64(); |
| SecT571Field.reduce(tt, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement divide(ECFieldElement b) |
| { |
| return multiply(b.invert()); |
| } |
| |
| public ECFieldElement negate() |
| { |
| return this; |
| } |
| |
| public ECFieldElement square() |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.square(x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement squareMinusProduct(ECFieldElement x, ECFieldElement y) |
| { |
| return squarePlusProduct(x, y); |
| } |
| |
| public ECFieldElement squarePlusProduct(ECFieldElement x, ECFieldElement y) |
| { |
| long[] ax = this.x; |
| long[] xx = ((SecT571FieldElement)x).x, yx = ((SecT571FieldElement)y).x; |
| |
| long[] tt = Nat576.createExt64(); |
| SecT571Field.squareAddToExt(ax, tt); |
| SecT571Field.multiplyAddToExt(xx, yx, tt); |
| |
| long[] z = Nat576.create64(); |
| SecT571Field.reduce(tt, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement squarePow(int pow) |
| { |
| if (pow < 1) |
| { |
| return this; |
| } |
| |
| long[] z = Nat576.create64(); |
| SecT571Field.squareN(x, pow, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement invert() |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.invert(x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public ECFieldElement sqrt() |
| { |
| long[] z = Nat576.create64(); |
| SecT571Field.sqrt(x, z); |
| return new SecT571FieldElement(z); |
| } |
| |
| public int getRepresentation() |
| { |
| return ECFieldElement.F2m.PPB; |
| } |
| |
| public int getM() |
| { |
| return 571; |
| } |
| |
| public int getK1() |
| { |
| return 2; |
| } |
| |
| public int getK2() |
| { |
| return 5; |
| } |
| |
| public int getK3() |
| { |
| return 10; |
| } |
| |
| public boolean equals(Object other) |
| { |
| if (other == this) |
| { |
| return true; |
| } |
| |
| if (!(other instanceof SecT571FieldElement)) |
| { |
| return false; |
| } |
| |
| SecT571FieldElement o = (SecT571FieldElement)other; |
| return Nat576.eq64(x, o.x); |
| } |
| |
| public int hashCode() |
| { |
| return 5711052 ^ Arrays.hashCode(x, 0, 9); |
| } |
| } |