| /* GENERATED SOURCE. DO NOT MODIFY. */ |
| package com.android.org.bouncycastle.math.ec.custom.sec; |
| |
| import java.math.BigInteger; |
| import java.security.SecureRandom; |
| |
| import com.android.org.bouncycastle.math.ec.AbstractECLookupTable; |
| import com.android.org.bouncycastle.math.ec.ECConstants; |
| import com.android.org.bouncycastle.math.ec.ECCurve; |
| import com.android.org.bouncycastle.math.ec.ECFieldElement; |
| import com.android.org.bouncycastle.math.ec.ECLookupTable; |
| import com.android.org.bouncycastle.math.ec.ECPoint; |
| import com.android.org.bouncycastle.math.raw.Nat256; |
| import com.android.org.bouncycastle.util.encoders.Hex; |
| |
| /** |
| * @hide This class is not part of the Android public SDK API |
| */ |
| public class SecP256R1Curve extends ECCurve.AbstractFp |
| { |
| public static final BigInteger q = SecP256R1FieldElement.Q; |
| |
| private static final int SECP256R1_DEFAULT_COORDS = COORD_JACOBIAN; |
| private static final ECFieldElement[] SECP256R1_AFFINE_ZS = new ECFieldElement[] { new SecP256R1FieldElement(ECConstants.ONE) }; |
| |
| protected SecP256R1Point infinity; |
| |
| public SecP256R1Curve() |
| { |
| super(q); |
| |
| this.infinity = new SecP256R1Point(this, null, null); |
| |
| this.a = fromBigInteger(new BigInteger(1, |
| Hex.decodeStrict("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC"))); |
| this.b = fromBigInteger(new BigInteger(1, |
| Hex.decodeStrict("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B"))); |
| this.order = new BigInteger(1, Hex.decodeStrict("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551")); |
| this.cofactor = BigInteger.valueOf(1); |
| |
| this.coord = SECP256R1_DEFAULT_COORDS; |
| } |
| |
| protected ECCurve cloneCurve() |
| { |
| return new SecP256R1Curve(); |
| } |
| |
| public boolean supportsCoordinateSystem(int coord) |
| { |
| switch (coord) |
| { |
| case COORD_JACOBIAN: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| public BigInteger getQ() |
| { |
| return q; |
| } |
| |
| public int getFieldSize() |
| { |
| return q.bitLength(); |
| } |
| |
| public ECFieldElement fromBigInteger(BigInteger x) |
| { |
| return new SecP256R1FieldElement(x); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y) |
| { |
| return new SecP256R1Point(this, x, y); |
| } |
| |
| protected ECPoint createRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs) |
| { |
| return new SecP256R1Point(this, x, y, zs); |
| } |
| |
| public ECPoint getInfinity() |
| { |
| return infinity; |
| } |
| |
| public ECLookupTable createCacheSafeLookupTable(ECPoint[] points, int off, final int len) |
| { |
| final int FE_INTS = 8; |
| |
| final int[] table = new int[len * FE_INTS * 2]; |
| { |
| int pos = 0; |
| for (int i = 0; i < len; ++i) |
| { |
| ECPoint p = points[off + i]; |
| Nat256.copy(((SecP256R1FieldElement)p.getRawXCoord()).x, 0, table, pos); pos += FE_INTS; |
| Nat256.copy(((SecP256R1FieldElement)p.getRawYCoord()).x, 0, table, pos); pos += FE_INTS; |
| } |
| } |
| |
| return new AbstractECLookupTable() |
| { |
| public int getSize() |
| { |
| return len; |
| } |
| |
| public ECPoint lookup(int index) |
| { |
| int[] x = Nat256.create(), y = Nat256.create(); |
| int pos = 0; |
| |
| for (int i = 0; i < len; ++i) |
| { |
| int MASK = ((i ^ index) - 1) >> 31; |
| |
| for (int j = 0; j < FE_INTS; ++j) |
| { |
| x[j] ^= table[pos + j] & MASK; |
| y[j] ^= table[pos + FE_INTS + j] & MASK; |
| } |
| |
| pos += (FE_INTS * 2); |
| } |
| |
| return createPoint(x, y); |
| } |
| |
| public ECPoint lookupVar(int index) |
| { |
| int[] x = Nat256.create(), y = Nat256.create(); |
| int pos = index * FE_INTS * 2; |
| |
| for (int j = 0; j < FE_INTS; ++j) |
| { |
| x[j] = table[pos + j]; |
| y[j] = table[pos + FE_INTS + j]; |
| } |
| |
| return createPoint(x, y); |
| } |
| |
| private ECPoint createPoint(int[] x, int[] y) |
| { |
| return createRawPoint(new SecP256R1FieldElement(x), new SecP256R1FieldElement(y), SECP256R1_AFFINE_ZS); |
| } |
| }; |
| } |
| |
| public ECFieldElement randomFieldElement(SecureRandom r) |
| { |
| int[] x = Nat256.create(); |
| SecP256R1Field.random(r, x); |
| return new SecP256R1FieldElement(x); |
| } |
| |
| public ECFieldElement randomFieldElementMult(SecureRandom r) |
| { |
| int[] x = Nat256.create(); |
| SecP256R1Field.randomMult(r, x); |
| return new SecP256R1FieldElement(x); |
| } |
| } |