--- /dev/null	2019-05-28 09:12:20.000000000 +0200
+++ new/src/jdk.crypto.ec/share/classes/sun/security/ec/ECOperations.java	2019-05-28 09:12:18.591901900 +0200
@@ -0,0 +1,493 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.security.ec;
+
+import sun.security.ec.point.*;
+import sun.security.util.math.*;
+import sun.security.util.math.intpoly.*;
+
+import java.math.BigInteger;
+import java.security.ProviderException;
+import java.security.spec.ECFieldFp;
+import java.security.spec.ECParameterSpec;
+import java.security.spec.EllipticCurve;
+import java.util.Map;
+import java.util.Optional;
+
+/*
+ * Elliptic curve point arithmetic for prime-order curves where a=-3.
+ * Formulas are derived from "Complete addition formulas for prime order
+ * elliptic curves" by Renes, Costello, and Batina.
+ */
+
+public class ECOperations {
+
+    /*
+     * An exception indicating a problem with an intermediate value produced
+     * by some part of the computation. For example, the signing operation
+     * will throw this exception to indicate that the r or s value is 0, and
+     * that the signing operation should be tried again with a different nonce.
+     */
+    static class IntermediateValueException extends Exception {
+        private static final long serialVersionUID = 1;
+    }
+
+    static final Map<BigInteger, IntegerFieldModuloP> fields = Map.of(
+        IntegerPolynomialP256.MODULUS, new IntegerPolynomialP256(),
+        IntegerPolynomialP384.MODULUS, new IntegerPolynomialP384(),
+        IntegerPolynomialP521.MODULUS, new IntegerPolynomialP521()
+    );
+
+    static final Map<BigInteger, IntegerFieldModuloP> orderFields = Map.of(
+        P256OrderField.MODULUS, new P256OrderField(),
+        P384OrderField.MODULUS, new P384OrderField(),
+        P521OrderField.MODULUS, new P521OrderField()
+    );
+
+    public static Optional<ECOperations> forParameters(ECParameterSpec params) {
+
+        EllipticCurve curve = params.getCurve();
+        if (!(curve.getField() instanceof ECFieldFp)) {
+            return Optional.empty();
+        }
+        ECFieldFp primeField = (ECFieldFp) curve.getField();
+
+        BigInteger three = BigInteger.valueOf(3);
+        if (!primeField.getP().subtract(curve.getA()).equals(three)) {
+            return Optional.empty();
+        }
+        IntegerFieldModuloP field = fields.get(primeField.getP());
+        if (field == null) {
+            return Optional.empty();
+        }
+
+        IntegerFieldModuloP orderField = orderFields.get(params.getOrder());
+        if (orderField == null) {
+            return Optional.empty();
+        }
+
+        ImmutableIntegerModuloP b = field.getElement(curve.getB());
+        ECOperations ecOps = new ECOperations(b, orderField);
+        return Optional.of(ecOps);
+    }
+
+    final ImmutableIntegerModuloP b;
+    final SmallValue one;
+    final SmallValue two;
+    final SmallValue three;
+    final SmallValue four;
+    final ProjectivePoint.Immutable neutral;
+    private final IntegerFieldModuloP orderField;
+
+    public ECOperations(IntegerModuloP b, IntegerFieldModuloP orderField) {
+        this.b = b.fixed();
+        this.orderField = orderField;
+
+        this.one = b.getField().getSmallValue(1);
+        this.two = b.getField().getSmallValue(2);
+        this.three = b.getField().getSmallValue(3);
+        this.four = b.getField().getSmallValue(4);
+
+        IntegerFieldModuloP field = b.getField();
+        this.neutral = new ProjectivePoint.Immutable(field.get0(),
+            field.get1(), field.get0());
+    }
+
+    public IntegerFieldModuloP getField() {
+        return b.getField();
+    }
+    public IntegerFieldModuloP getOrderField() {
+        return orderField;
+    }
+
+    protected ProjectivePoint.Immutable getNeutral() {
+        return neutral;
+    }
+
+    public boolean isNeutral(Point p) {
+        ProjectivePoint<?> pp = (ProjectivePoint<?>) p;
+
+        IntegerModuloP z = pp.getZ();
+
+        IntegerFieldModuloP field = z.getField();
+        int byteLength = (field.getSize().bitLength() + 7) / 8;
+        byte[] zBytes = z.asByteArray(byteLength);
+        return allZero(zBytes);
+    }
+
+    byte[] seedToScalar(byte[] seedBytes)
+        throws IntermediateValueException {
+
+        // Produce a nonce from the seed using FIPS 186-4,section B.5.1:
+        // Per-Message Secret Number Generation Using Extra Random Bits
+        // or
+        // Produce a scalar from the seed using FIPS 186-4, section B.4.1:
+        // Key Pair Generation Using Extra Random Bits
+
+        // To keep the implementation simple, sample in the range [0,n)
+        // and throw IntermediateValueException in the (unlikely) event
+        // that the result is 0.
+
+        // Get 64 extra bits and reduce in to the nonce
+        int seedBits = orderField.getSize().bitLength() + 64;
+        if (seedBytes.length * 8 < seedBits) {
+            throw new ProviderException("Incorrect seed length: " +
+            seedBytes.length * 8 + " < " + seedBits);
+        }
+
+        // input conversion only works on byte boundaries
+        // clear high-order bits of last byte so they don't influence nonce
+        int lastByteBits = seedBits % 8;
+        if (lastByteBits != 0) {
+            int lastByteIndex = seedBits / 8;
+            byte mask = (byte) (0xFF >>> (8 - lastByteBits));
+            seedBytes[lastByteIndex] &= mask;
+        }
+
+        int seedLength = (seedBits + 7) / 8;
+        IntegerModuloP scalarElem =
+            orderField.getElement(seedBytes, 0, seedLength, (byte) 0);
+        int scalarLength = (orderField.getSize().bitLength() + 7) / 8;
+        byte[] scalarArr = new byte[scalarLength];
+        scalarElem.asByteArray(scalarArr);
+        if (ECOperations.allZero(scalarArr)) {
+            throw new IntermediateValueException();
+        }
+        return scalarArr;
+    }
+
+    /*
+     * Compare all values in the array to 0 without branching on any value
+     *
+     */
+    public static boolean allZero(byte[] arr) {
+        byte acc = 0;
+        for (int i = 0; i < arr.length; i++) {
+            acc |= arr[i];
+        }
+        return acc == 0;
+    }
+
+    /*
+     * 4-bit branchless array lookup for projective points.
+     */
+    private void lookup4(ProjectivePoint.Immutable[] arr, int index,
+        ProjectivePoint.Mutable result, IntegerModuloP zero) {
+
+        for (int i = 0; i < 16; i++) {
+            int xor = index ^ i;
+            int bit3 = (xor & 0x8) >>> 3;
+            int bit2 = (xor & 0x4) >>> 2;
+            int bit1 = (xor & 0x2) >>> 1;
+            int bit0 = (xor & 0x1);
+            int inverse = bit0 | bit1 | bit2 | bit3;
+            int set = 1 - inverse;
+
+            ProjectivePoint.Immutable pi = arr[i];
+            result.conditionalSet(pi, set);
+        }
+    }
+
+    private void double4(ProjectivePoint.Mutable p, MutableIntegerModuloP t0,
+        MutableIntegerModuloP t1, MutableIntegerModuloP t2,
+        MutableIntegerModuloP t3, MutableIntegerModuloP t4) {
+
+        for (int i = 0; i < 4; i++) {
+            setDouble(p, t0, t1, t2, t3, t4);
+        }
+    }
+
+    /**
+     * Multiply an affine point by a scalar and return the result as a mutable
+     * point.
+     *
+     * @param affineP the point
+     * @param s the scalar as a little-endian array
+     * @return the product
+     */
+    public MutablePoint multiply(AffinePoint affineP, byte[] s) {
+
+        // 4-bit windowed multiply with branchless lookup.
+        // The mixed addition is faster, so it is used to construct the array
+        // at the beginning of the operation.
+
+        IntegerFieldModuloP field = affineP.getX().getField();
+        ImmutableIntegerModuloP zero = field.get0();
+        // temporaries
+        MutableIntegerModuloP t0 = zero.mutable();
+        MutableIntegerModuloP t1 = zero.mutable();
+        MutableIntegerModuloP t2 = zero.mutable();
+        MutableIntegerModuloP t3 = zero.mutable();
+        MutableIntegerModuloP t4 = zero.mutable();
+
+        ProjectivePoint.Mutable result = new ProjectivePoint.Mutable(field);
+        result.getY().setValue(field.get1().mutable());
+
+        ProjectivePoint.Immutable[] pointMultiples =
+            new ProjectivePoint.Immutable[16];
+        // 0P is neutral---same as initial result value
+        pointMultiples[0] = result.fixed();
+
+        ProjectivePoint.Mutable ps = new ProjectivePoint.Mutable(field);
+        ps.setValue(affineP);
+        // 1P = P
+        pointMultiples[1] = ps.fixed();
+
+        // the rest are calculated using mixed point addition
+        for (int i = 2; i < 16; i++) {
+            setSum(ps, affineP, t0, t1, t2, t3, t4);
+            pointMultiples[i] = ps.fixed();
+        }
+
+        ProjectivePoint.Mutable lookupResult = ps.mutable();
+
+        for (int i = s.length - 1; i >= 0; i--) {
+
+            double4(result, t0, t1, t2, t3, t4);
+
+            int high = (0xFF & s[i]) >>> 4;
+            lookup4(pointMultiples, high, lookupResult, zero);
+            setSum(result, lookupResult, t0, t1, t2, t3, t4);
+
+            double4(result, t0, t1, t2, t3, t4);
+
+            int low = 0xF & s[i];
+            lookup4(pointMultiples, low, lookupResult, zero);
+            setSum(result, lookupResult, t0, t1, t2, t3, t4);
+        }
+
+        return result;
+
+    }
+
+    /*
+     * Point double
+     */
+    private void setDouble(ProjectivePoint.Mutable p, MutableIntegerModuloP t0,
+        MutableIntegerModuloP t1, MutableIntegerModuloP t2,
+        MutableIntegerModuloP t3, MutableIntegerModuloP t4) {
+
+        t0.setValue(p.getX()).setSquare();
+        t1.setValue(p.getY()).setSquare();
+        t2.setValue(p.getZ()).setSquare();
+        t3.setValue(p.getX()).setProduct(p.getY());
+        t4.setValue(p.getY()).setProduct(p.getZ());
+
+        t3.setSum(t3);
+        p.getZ().setProduct(p.getX());
+
+        p.getZ().setProduct(two);
+
+        p.getY().setValue(t2).setProduct(b);
+        p.getY().setDifference(p.getZ());
+
+        p.getX().setValue(p.getY()).setProduct(two);
+        p.getY().setSum(p.getX());
+        p.getY().setReduced();
+        p.getX().setValue(t1).setDifference(p.getY());
+
+        p.getY().setSum(t1);
+        p.getY().setProduct(p.getX());
+        p.getX().setProduct(t3);
+
+        t3.setValue(t2).setProduct(two);
+        t2.setSum(t3);
+        p.getZ().setProduct(b);
+
+        t2.setReduced();
+        p.getZ().setDifference(t2);
+        p.getZ().setDifference(t0);
+        t3.setValue(p.getZ()).setProduct(two);
+        p.getZ().setReduced();
+        p.getZ().setSum(t3);
+        t0.setProduct(three);
+
+        t0.setDifference(t2);
+        t0.setProduct(p.getZ());
+        p.getY().setSum(t0);
+
+        t4.setSum(t4);
+        p.getZ().setProduct(t4);
+
+        p.getX().setDifference(p.getZ());
+        p.getZ().setValue(t4).setProduct(t1);
+
+        p.getZ().setProduct(four);
+
+    }
+
+    /*
+     * Mixed point addition. This method constructs new temporaries each time
+     * it is called. For better efficiency, the method that reuses temporaries
+     * should be used if more than one sum will be computed.
+     */
+    public void setSum(MutablePoint p, AffinePoint p2) {
+
+        IntegerModuloP zero = p.getField().get0();
+        MutableIntegerModuloP t0 = zero.mutable();
+        MutableIntegerModuloP t1 = zero.mutable();
+        MutableIntegerModuloP t2 = zero.mutable();
+        MutableIntegerModuloP t3 = zero.mutable();
+        MutableIntegerModuloP t4 = zero.mutable();
+        setSum((ProjectivePoint.Mutable) p, p2, t0, t1, t2, t3, t4);
+
+    }
+
+    /*
+     * Mixed point addition
+     */
+    private void setSum(ProjectivePoint.Mutable p, AffinePoint p2,
+        MutableIntegerModuloP t0, MutableIntegerModuloP t1,
+        MutableIntegerModuloP t2, MutableIntegerModuloP t3,
+        MutableIntegerModuloP t4) {
+
+        t0.setValue(p.getX()).setProduct(p2.getX());
+        t1.setValue(p.getY()).setProduct(p2.getY());
+        t3.setValue(p2.getX()).setSum(p2.getY());
+        t4.setValue(p.getX()).setSum(p.getY());
+        p.getX().setReduced();
+        t3.setProduct(t4);
+        t4.setValue(t0).setSum(t1);
+
+        t3.setDifference(t4);
+        t4.setValue(p2.getY()).setProduct(p.getZ());
+        t4.setSum(p.getY());
+
+        p.getY().setValue(p2.getX()).setProduct(p.getZ());
+        p.getY().setSum(p.getX());
+        t2.setValue(p.getZ());
+        p.getZ().setProduct(b);
+
+        p.getX().setValue(p.getY()).setDifference(p.getZ());
+        p.getX().setReduced();
+        p.getZ().setValue(p.getX()).setProduct(two);
+        p.getX().setSum(p.getZ());
+
+        p.getZ().setValue(t1).setDifference(p.getX());
+        p.getX().setSum(t1);
+        p.getY().setProduct(b);
+
+        t1.setValue(t2).setProduct(two);
+        t2.setSum(t1);
+        t2.setReduced();
+        p.getY().setDifference(t2);
+
+        p.getY().setDifference(t0);
+        p.getY().setReduced();
+        t1.setValue(p.getY()).setProduct(two);
+        p.getY().setSum(t1);
+
+        t1.setValue(t0).setProduct(two);
+        t0.setSum(t1);
+        t0.setDifference(t2);
+
+        t1.setValue(t4).setProduct(p.getY());
+        t2.setValue(t0).setProduct(p.getY());
+        p.getY().setValue(p.getX()).setProduct(p.getZ());
+
+        p.getY().setSum(t2);
+        p.getX().setProduct(t3);
+        p.getX().setDifference(t1);
+
+        p.getZ().setProduct(t4);
+        t1.setValue(t3).setProduct(t0);
+        p.getZ().setSum(t1);
+
+    }
+
+    /*
+     * Projective point addition
+     */
+    private void setSum(ProjectivePoint.Mutable p, ProjectivePoint.Mutable p2,
+        MutableIntegerModuloP t0, MutableIntegerModuloP t1,
+        MutableIntegerModuloP t2, MutableIntegerModuloP t3,
+        MutableIntegerModuloP t4) {
+
+        t0.setValue(p.getX()).setProduct(p2.getX());
+        t1.setValue(p.getY()).setProduct(p2.getY());
+        t2.setValue(p.getZ()).setProduct(p2.getZ());
+
+        t3.setValue(p.getX()).setSum(p.getY());
+        t4.setValue(p2.getX()).setSum(p2.getY());
+        t3.setProduct(t4);
+
+        t4.setValue(t0).setSum(t1);
+        t3.setDifference(t4);
+        t4.setValue(p.getY()).setSum(p.getZ());
+
+        p.getY().setValue(p2.getY()).setSum(p2.getZ());
+        t4.setProduct(p.getY());
+        p.getY().setValue(t1).setSum(t2);
+
+        t4.setDifference(p.getY());
+        p.getX().setSum(p.getZ());
+        p.getY().setValue(p2.getX()).setSum(p2.getZ());
+
+        p.getX().setProduct(p.getY());
+        p.getY().setValue(t0).setSum(t2);
+        p.getY().setAdditiveInverse().setSum(p.getX());
+        p.getY().setReduced();
+
+        p.getZ().setValue(t2).setProduct(b);
+        p.getX().setValue(p.getY()).setDifference(p.getZ());
+        p.getZ().setValue(p.getX()).setProduct(two);
+
+        p.getX().setSum(p.getZ());
+        p.getX().setReduced();
+        p.getZ().setValue(t1).setDifference(p.getX());
+        p.getX().setSum(t1);
+
+        p.getY().setProduct(b);
+        t1.setValue(t2).setSum(t2);
+        t2.setSum(t1);
+        t2.setReduced();
+
+        p.getY().setDifference(t2);
+        p.getY().setDifference(t0);
+        p.getY().setReduced();
+        t1.setValue(p.getY()).setSum(p.getY());
+
+        p.getY().setSum(t1);
+        t1.setValue(t0).setProduct(two);
+        t0.setSum(t1);
+
+        t0.setDifference(t2);
+        t1.setValue(t4).setProduct(p.getY());
+        t2.setValue(t0).setProduct(p.getY());
+
+        p.getY().setValue(p.getX()).setProduct(p.getZ());
+        p.getY().setSum(t2);
+        p.getX().setProduct(t3);
+
+        p.getX().setDifference(t1);
+        p.getZ().setProduct(t4);
+        t1.setValue(t3).setProduct(t0);
+
+        p.getZ().setSum(t1);
+
+    }
+}
+