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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.test;

import org.bouncycastle.asn1.nist.NISTNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.test.SimpleTest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class NISTECCTest
    extends SimpleTest
{
    public String getName()
    {
        return "NISTECC";
    }

    public void performTest() throws Exception
    {
        testVectors();
    }

    public void testVectors() throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("nist_ecc.txt")));
        try
        {
            String line = br.readLine();
            X9ECParameters curve = null;
            X9ECParameters curveCustom = null;
            BigInteger k = null;
            BigInteger x = null;
            BigInteger y = null;

            while (line != null)
            {
                while (null != (line = br.readLine()))
                {
                    Matcher matcher = Pattern.compile("^ ?(\\w+):? =? ?(\\w+)").matcher(line);
                    if (!matcher.matches())
                    {
                        continue;
                    }

                    String nistKey = matcher.group(1);
                    String nistValue = matcher.group(2);

                    if ("Curve".equals(nistKey))
                    {
                        // Change curve name from LNNN to L-NNN ie: P256 to P-256
                        String curveName = nistValue.charAt(0) + "-" + nistValue.substring(1);
                        curve = NISTNamedCurves.getByName(curveName);
                        curveCustom = CustomNamedCurves.getByName(curveName);
                    }
                    else if ("k".equals(nistKey))
                    {
                        k = new BigInteger(nistValue, 10);
                    }
                    else if ("x".equals(nistKey))
                    {
                        x = new BigInteger(nistValue, 16);
                    }
                    else if ("y".equals(nistKey))
                    {
                        y = new BigInteger(nistValue, 16);
                    }

                    if (k == null || x == null || y == null)
                    {
                        continue;
                    }

                    if (curve != null)
                    {
                        implTestMultiply(curve, k, x, y);
                    }
                    if (curveCustom != null)
                    {
                        implTestMultiply(curveCustom, k, x, y);
                    }

                    k = null;
                    x = null;
                    y = null;
                }
            }
        }
        catch (IOException exception)
        {
            fail("Failed to load resources.", exception);
        }
        finally
        {
            br.close();
        }
    }

    private void implTestMultiply(X9ECParameters curve, BigInteger k, BigInteger x, BigInteger y)
    {
        // Act
        ECPoint ecPoint = curve.getG().multiply(k).normalize();
        BigInteger affineXCoord = ecPoint.getAffineXCoord().toBigInteger();
        BigInteger affineYCoord = ecPoint.getAffineYCoord().toBigInteger();

        // Assert
        isEquals("Unexpected X Coordinate", x, affineXCoord);
        isEquals("Unexpected Y Coordinate", y, affineYCoord);
    }

    public static void main(String[] args)
    {
        runTest(new NISTECCTest());
    }
}