Example usage for org.bouncycastle.math.ec ECPoint getAffineYCoord

Introduction

In this page you can find the example usage for org.bouncycastle.math.ec ECPoint getAffineYCoord.

Prototype

public ECFieldElement getAffineYCoord() 

Source Link

Document

Returns the affine y-coordinate after checking that this point is normalized

Usage

From source file:org.cryptoworkshop.ximix.demo.ballot.Main.java

License:Apache License

public static void outputPoint(BufferedWriter cWrt, ECPoint point, boolean isLast) throws IOException {
    cWrt.write("        {");
    cWrt.newLine();//  ww w .  ja  v a2s  .co m
    cWrt.write("            \"x\" : \"" + point.getAffineXCoord().toBigInteger().toString(16) + "\",");
    cWrt.newLine();
    cWrt.write("            \"y\" : \"" + point.getAffineYCoord().toBigInteger().toString(16) + "\"");
    cWrt.newLine();
    if (isLast) {
        cWrt.write("        }");
    } else {
        cWrt.write("        },");
    }
    cWrt.newLine();
}

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From source file:org.sufficientlysecure.keychain.securitytoken.SCP11bSecureMessaging.java

License:Open Source License

private static ECPublicKey newECDHPublicKey(final ECKeyFormat kf, byte[] data) throws InvalidKeySpecException,
        NoSuchAlgorithmException, InvalidParameterSpecException, NoSuchProviderException {
    if (ecdhFactory == null) {
        ecdhFactory = KeyFactory.getInstance(SCP11B_KEY_AGREEMENT_KEY_TYPE, PROVIDER);
    }//from   w  w w  .  java  2s .  co m

    final X9ECParameters params = NISTNamedCurves.getByOID(kf.getCurveOID());
    if (params == null) {
        throw new InvalidParameterSpecException("unsupported curve");
    }

    final ECCurve curve = params.getCurve();
    final ECPoint p = curve.decodePoint(data);
    if (!p.isValid()) {
        throw new InvalidKeySpecException("invalid EC point");
    }

    final java.security.spec.ECPublicKeySpec pk = new java.security.spec.ECPublicKeySpec(
            new java.security.spec.ECPoint(p.getAffineXCoord().toBigInteger(),
                    p.getAffineYCoord().toBigInteger()),
            getAlgorithmParameterSpec(kf));

    return (ECPublicKey) (ecdhFactory.generatePublic(pk));
}

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