diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP128R1FieldElement.java')
-rw-r--r-- | bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP128R1FieldElement.java | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP128R1FieldElement.java b/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP128R1FieldElement.java deleted file mode 100644 index 7d490a4b..00000000 --- a/bcprov/src/main/java/org/bouncycastle/math/ec/custom/sec/SecP128R1FieldElement.java +++ /dev/null @@ -1,199 +0,0 @@ -package org.bouncycastle.math.ec.custom.sec; - -import java.math.BigInteger; - -import org.bouncycastle.math.ec.ECFieldElement; -import org.bouncycastle.math.raw.Mod; -import org.bouncycastle.math.raw.Nat128; -import org.bouncycastle.util.Arrays; - -public class SecP128R1FieldElement extends ECFieldElement.AbstractFp -{ - public static final BigInteger Q = SecP128R1Curve.q; - - protected int[] x; - - public SecP128R1FieldElement(BigInteger x) - { - if (x == null || x.signum() < 0 || x.compareTo(Q) >= 0) - { - throw new IllegalArgumentException("x value invalid for SecP128R1FieldElement"); - } - - this.x = SecP128R1Field.fromBigInteger(x); - } - - public SecP128R1FieldElement() - { - this.x = Nat128.create(); - } - - protected SecP128R1FieldElement(int[] x) - { - this.x = x; - } - - public boolean isZero() - { - return Nat128.isZero(x); - } - - public boolean isOne() - { - return Nat128.isOne(x); - } - - public boolean testBitZero() - { - return Nat128.getBit(x, 0) == 1; - } - - public BigInteger toBigInteger() - { - return Nat128.toBigInteger(x); - } - - public String getFieldName() - { - return "SecP128R1Field"; - } - - public int getFieldSize() - { - return Q.bitLength(); - } - - public ECFieldElement add(ECFieldElement b) - { - int[] z = Nat128.create(); - SecP128R1Field.add(x, ((SecP128R1FieldElement)b).x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement addOne() - { - int[] z = Nat128.create(); - SecP128R1Field.addOne(x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement subtract(ECFieldElement b) - { - int[] z = Nat128.create(); - SecP128R1Field.subtract(x, ((SecP128R1FieldElement)b).x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement multiply(ECFieldElement b) - { - int[] z = Nat128.create(); - SecP128R1Field.multiply(x, ((SecP128R1FieldElement)b).x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement divide(ECFieldElement b) - { -// return multiply(b.invert()); - int[] z = Nat128.create(); - Mod.invert(SecP128R1Field.P, ((SecP128R1FieldElement)b).x, z); - SecP128R1Field.multiply(z, x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement negate() - { - int[] z = Nat128.create(); - SecP128R1Field.negate(x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement square() - { - int[] z = Nat128.create(); - SecP128R1Field.square(x, z); - return new SecP128R1FieldElement(z); - } - - public ECFieldElement invert() - { -// return new SecP128R1FieldElement(toBigInteger().modInverse(Q)); - int[] z = Nat128.create(); - Mod.invert(SecP128R1Field.P, x, z); - return new SecP128R1FieldElement(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 2^126 - 2^95 - * - * Breaking up the exponent's binary representation into "repunits", we get: - * { 31 1s } { 95 0s } - * - * Therefore we need an addition chain containing 31 (the length of the repunit) We use: - * 1, 2, 4, 8, 10, 20, 30, [31] - */ - - int[] x1 = this.x; - if (Nat128.isZero(x1) || Nat128.isOne(x1)) - { - return this; - } - - int[] x2 = Nat128.create(); - SecP128R1Field.square(x1, x2); - SecP128R1Field.multiply(x2, x1, x2); - int[] x4 = Nat128.create(); - SecP128R1Field.squareN(x2, 2, x4); - SecP128R1Field.multiply(x4, x2, x4); - int[] x8 = Nat128.create(); - SecP128R1Field.squareN(x4, 4, x8); - SecP128R1Field.multiply(x8, x4, x8); - int[] x10 = x4; - SecP128R1Field.squareN(x8, 2, x10); - SecP128R1Field.multiply(x10, x2, x10); - int[] x20 = x2; - SecP128R1Field.squareN(x10, 10, x20); - SecP128R1Field.multiply(x20, x10, x20); - int[] x30 = x8; - SecP128R1Field.squareN(x20, 10, x30); - SecP128R1Field.multiply(x30, x10, x30); - int[] x31 = x10; - SecP128R1Field.square(x30, x31); - SecP128R1Field.multiply(x31, x1, x31); - - int[] t1 = x31; - SecP128R1Field.squareN(t1, 95, t1); - - int[] t2 = x30; - SecP128R1Field.square(t1, t2); - - return Nat128.eq(x1, t2) ? new SecP128R1FieldElement(t1) : null; - } - - public boolean equals(Object other) - { - if (other == this) - { - return true; - } - - if (!(other instanceof SecP128R1FieldElement)) - { - return false; - } - - SecP128R1FieldElement o = (SecP128R1FieldElement)other; - return Nat128.eq(x, o.x); - } - - public int hashCode() - { - return Q.hashCode() ^ Arrays.hashCode(x, 0, 4); - } -} |