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

Introduction

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

Prototype

public ECFieldElement getAffineXCoord() 

Source Link

Document

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

Usage

From source file:com.github.horrorho.inflatabledonkey.crypto.ec.ECCurvePoint.java

License:Open Source License

public byte[] agreement(BigInteger d) {
    // TODO thread safety of ECPoint unclear.
    synchronized (lock) {
        ECPoint P = Q.multiply(d).normalize();
        if (P.isInfinity()) {
            throw new IllegalStateException("invalid EDCH: infinity");
        }//from  www.ja  va2 s  . c  o  m

        return P.getAffineXCoord().getEncoded();
    }
}

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From source file:com.github.horrorho.inflatabledonkey.crypto.rfc6637.RFC6637KDF.java

License:Open Source License

public byte[] apply(ECPoint S, byte[] fingerprint) throws IOException {
    // RFC Sections 7, 8
    byte[] ZB = S.getAffineXCoord().getEncoded();

    Digest digest = digestFactory.get();

    digest.update((byte) 0x00); // 00
    digest.update((byte) 0x00); // 00
    digest.update((byte) 0x00); // 00 
    digest.update((byte) 0x01); // 01 
    digest.update(ZB, 0, ZB.length); // ZB

    // Params/*  w w w . ja va 2  s .c  o  m*/
    digest.update(formattedOid, 0, formattedOid.length); // curve_OID_len || curve_OID 
    digest.update(publicKeyAlgID); // public_key_alg_ID
    digest.update((byte) 0x03); // 03
    digest.update((byte) 0x01); // 01
    digest.update(kdfHashID); // KDF_hash_ID
    digest.update(symAlgID); // KEK_alg_ID for AESKeyWrap
    digest.update(ANONYMOUS_SENDER, 0, ANONYMOUS_SENDER.length); // "Anonymous Sender    "
    digest.update(fingerprint, 0, fingerprint.length); // recipient_fingerprint

    byte[] hash = new byte[digest.getDigestSize()];
    digest.doFinal(hash, 0);
    return hash;
}

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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();// w  ww .  ja  va 2s.  c o 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.cryptoworkshop.ximix.node.crypto.signature.ECDSASignerEngine.java

License:Apache License

private void generateAndSendKAndP(SignatureMessage message) throws IOException {
    ECDSAInitialiseMessage ecdsaCreate = ECDSAInitialiseMessage.getInstance(message.getPayload());
    SubjectPublicKeyInfo pubKeyInfo = nodeContext.getPublicKey(ecdsaCreate.getKeyID());
    ECDomainParameters domainParams = ((ECPublicKeyParameters) PublicKeyFactory.createKey(pubKeyInfo))
            .getParameters();//from w  w w  .j a v  a2 s  . c om
    SigID sigID = new SigID(ecdsaCreate.getSigID());

    sharedKMap.init(sigID, ecdsaCreate.getNodesToUse().length);

    paramsMap.put(ecdsaCreate.getKeyID(), domainParams);

    BigInteger n = ecdsaCreate.getN();
    int nBitLength = n.bitLength();
    BigInteger k, r;

    do // generate r
    {
        do {
            k = new BigInteger(nBitLength, new SecureRandom());
        } while (k.equals(BigInteger.ZERO) || k.compareTo(n) >= 0);

        ECPoint p = domainParams.getG().multiply(k).normalize();

        // 5.3.3
        BigInteger x = p.getAffineXCoord().toBigInteger();

        r = x.mod(n);
    } while (r.equals(BigInteger.ZERO));

    ShamirSecretSplitter sss = new ShamirSecretSplitter(getNumberOfPeers(ecdsaCreate.getNodesToUse()),
            ecdsaCreate.getThreshold(), n, new SecureRandom());

    SplitSecret split = sss.split(k);

    execute(new SendShareTask(sigID, Type.STORE_K, ecdsaCreate.getNodesToUse(), sharedKMap, split.getShares()));

    sharedPMap.init(sigID, ecdsaCreate.getNodesToUse().length);

    execute(new SendPointShareTask(sigID, ecdsaCreate.getKeyID(), ecdsaCreate.getNodesToUse(),
            split.getShares()));
}

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From source file:org.cryptoworkshop.ximix.node.crypto.signature.ECDSASignerEngine.java

License:Apache License

private void initialiseR(SignatureMessage message) throws IOException, ServiceConnectionException {
    ECDSAInitialiseMessage ecdsaCreate = ECDSAInitialiseMessage.getInstance(message.getPayload());
    SigID sigID = new SigID(ecdsaCreate.getSigID());
    ECDomainParameters domainParams = paramsMap.get(ecdsaCreate.getKeyID());

    sharedPMap.waitFor(sigID); // wait till local P value set

    ECPoint p = accumulateECPoint(ecdsaCreate.getNodesToUse(), Type.FETCH_P,
            new ECDSAFetchMessage(ecdsaCreate.getSigID(), ecdsaCreate.getKeyID(), ecdsaCreate.getNodesToUse()),
            domainParams.getCurve(), domainParams.getN());
    // 5.3.3//from  w w w .ja v  a  2s.  c o  m
    BigInteger x = p.getAffineXCoord().toBigInteger();
    BigInteger r = x.mod(domainParams.getN());

    rMap.put(sigID, r);
}

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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);
    }/*w w w . j av a 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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