| /* GENERATED SOURCE. DO NOT MODIFY. */ |
| package com.android.internal.org.bouncycastle.math.ec.custom.sec; |
| |
| import java.math.BigInteger; |
| |
| import com.android.internal.org.bouncycastle.math.ec.ECFieldElement; |
| import com.android.internal.org.bouncycastle.math.raw.Nat; |
| import com.android.internal.org.bouncycastle.util.Arrays; |
| import com.android.internal.org.bouncycastle.util.encoders.Hex; |
| |
| /** |
| * @hide This class is not part of the Android public SDK API |
| */ |
| public class SecP521R1FieldElement extends ECFieldElement.AbstractFp |
| { |
| public static final BigInteger Q = new BigInteger(1, |
| Hex.decodeStrict("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")); |
| |
| protected int[] x; |
| |
| public SecP521R1FieldElement(BigInteger x) |
| { |
| if (x == null || x.signum() < 0 || x.compareTo(Q) >= 0) |
| { |
| throw new IllegalArgumentException("x value invalid for SecP521R1FieldElement"); |
| } |
| |
| this.x = SecP521R1Field.fromBigInteger(x); |
| } |
| |
| public SecP521R1FieldElement() |
| { |
| this.x = Nat.create(17); |
| } |
| |
| protected SecP521R1FieldElement(int[] x) |
| { |
| this.x = x; |
| } |
| |
| public boolean isZero() |
| { |
| return Nat.isZero(17, x); |
| } |
| |
| public boolean isOne() |
| { |
| return Nat.isOne(17, x); |
| } |
| |
| public boolean testBitZero() |
| { |
| return Nat.getBit(x, 0) == 1; |
| } |
| |
| public BigInteger toBigInteger() |
| { |
| return Nat.toBigInteger(17, x); |
| } |
| |
| public String getFieldName() |
| { |
| return "SecP521R1Field"; |
| } |
| |
| public int getFieldSize() |
| { |
| return Q.bitLength(); |
| } |
| |
| public ECFieldElement add(ECFieldElement b) |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.add(x, ((SecP521R1FieldElement)b).x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement addOne() |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.addOne(x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement subtract(ECFieldElement b) |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.subtract(x, ((SecP521R1FieldElement)b).x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement multiply(ECFieldElement b) |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.multiply(x, ((SecP521R1FieldElement)b).x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement divide(ECFieldElement b) |
| { |
| // return multiply(b.invert()); |
| int[] z = Nat.create(17); |
| SecP521R1Field.inv(((SecP521R1FieldElement)b).x, z); |
| SecP521R1Field.multiply(z, x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement negate() |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.negate(x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement square() |
| { |
| int[] z = Nat.create(17); |
| SecP521R1Field.square(x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| public ECFieldElement invert() |
| { |
| // return new SecP521R1FieldElement(toBigInteger().modInverse(Q)); |
| int[] z = Nat.create(17); |
| SecP521R1Field.inv(x, z); |
| return new SecP521R1FieldElement(z); |
| } |
| |
| // D.1.4 91 |
| /** |
| * return a sqrt root - the routine verifies that the calculation returns the right value - if |
| * none exists it returns null. |
| */ |
| public ECFieldElement sqrt() |
| { |
| // Raise this element to the exponent 2^519 |
| |
| int[] x1 = this.x; |
| if (Nat.isZero(17, x1) || Nat.isOne(17, x1)) |
| { |
| return this; |
| } |
| |
| int[] t1 = Nat.create(17); |
| int[] t2 = Nat.create(17); |
| |
| SecP521R1Field.squareN(x1, 519, t1); |
| SecP521R1Field.square(t1, t2); |
| |
| return Nat.eq(17, x1, t2) ? new SecP521R1FieldElement(t1) : null; |
| } |
| |
| public boolean equals(Object other) |
| { |
| if (other == this) |
| { |
| return true; |
| } |
| |
| if (!(other instanceof SecP521R1FieldElement)) |
| { |
| return false; |
| } |
| |
| SecP521R1FieldElement o = (SecP521R1FieldElement)other; |
| return Nat.eq(17, x, o.x); |
| } |
| |
| public int hashCode() |
| { |
| return Q.hashCode() ^ Arrays.hashCode(x, 0, 17); |
| } |
| } |