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

Introduction

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

Prototype

public ECPoint multiply(BigInteger k) 

Source Link

Document

Multiplies this ECPoint by the given number.

Usage

From source file:service.ACService.java

License:Open Source License

public AnonymousCertificate proveAttribute(int attrIndex) throws CardServiceException {
    BigInteger N = BigInteger.probablePrime(127, new SecureRandom());
    ECPoint nonce = c.getG().multiply(N);

    byte[][] data = new byte[2][];
    data[0] = new byte[1];
    data[0][0] = a[attrIndex].id;//w w  w.  j  a v a2 s. co m
    data[1] = toAPDU(nonce);
    CommandAPDU cmd = APDUprepare(GET_ATTRIBUTE, data, null);

    AnonymousCertificate result = new AnonymousCertificate();
    ResponseAPDU response = transmit(cmd);
    if (response.getSW() != 0x9000) {
        System.err.println("Request failed: " + response.getSW());
        return null;
    } else {
        byte[] resp = response.getData();
        int length, offset = 0;
        length = ((resp[offset] << 8) | (resp[offset + 1] & 0xff));
        result.signedNonce = fromAPDU(resp, offset);
        offset += length + 2;
        System.out.println("signedNonce: " + Hex.toHexString(result.signedNonce.toByteArray()));

        length = ((resp[offset] << 8) | (resp[offset + 1] & 0xff));
        result.blindedKey = fromAPDU(resp, offset);
        offset += length + 2;
        System.out.println("blindedKey:  " + Hex.toHexString(result.blindedKey.toByteArray()));

        length = ((resp[offset] << 8) | (resp[offset + 1] & 0xff));
        result.blindedSignature = fromAPDU(resp, offset);
        offset += length + 2;
        System.out.println("blindedSig:  " + Hex.toHexString(result.blindedSignature.toByteArray()));

        length = ((resp[offset] << 8) | (resp[offset + 1] & 0xff));
        offset += 2;
        result.attributeValue = new byte[length];
        System.arraycopy(resp, offset, result.attributeValue, 0, length);
        System.out.println("attribVal:   " + Hex.toHexString(result.attributeValue));
    }

    System.out.println("signedNonce: " + result.signedNonce);
    System.out.println("blindedKey:  " + result.blindedKey);
    System.out.println("blindedSig:  " + result.blindedSignature);
    System.out.println("attribVal:   " + new String(result.attributeValue));

    // *** NONCE SIGNATURE VERIFICATION ***
    long start = System.nanoTime();
    ECPoint sn = reconstructPoint(c, result.signedNonce, false);
    ECPoint bk = reconstructPoint(c, result.blindedKey, false);

    ECPoint bkn = bk.multiply(N);
    if (!bkn.equals(sn)) {
        if (!bkn.negate().equals(sn)) {
            System.out.println("Nonce verification failed");
            return null;
        } else {
        }
    } else {
    }
    System.out.println("Nonce verification succeeded");

    // *** PAIRING SIGNATURE VERIFICATION ***
    ECFieldElement e1 = c.R_atePairing(bk, saQ[attrIndex]);

    ECPoint bs = reconstructPoint(c, result.blindedSignature, false);
    ECFieldElement e2 = c.R_atePairing(bs, Q);

    ONE = new ECFieldElementFp12(new ECFieldElement.Fp(c.getQ(), BigInteger.valueOf(1)));

    if (!e1.equals(e2)) {
        if (!ONE.equals(e1.multiply(e2))) {
            System.out.println("Signature verification failed");
            return null;
        } else {
        }
    }
    System.out.println("Signature verification succeeded");

    long end = System.nanoTime();
    System.out.format(" d = %.2f ms\n", (end - start) / 1000000.0);
    return result;
}

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From source file:service.ACService.java

License:Open Source License

static private ECPoint[] constructCertificates(BigInteger[] private_key, ECPoint public_key) {
    ECPoint[] certificate = new ECPoint[private_key.length];

    for (int i = 0; i < private_key.length; i++) {
        certificate[i] = public_key.multiply(private_key[i]);
    }//from w  w  w. j  a  va2s. c o  m

    return certificate;
}

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From source file:terminal.GateClient.java

License:Open Source License

/**
 * Construct the corresponding public keys using the fixed point
 *///from   w w w .ja v  a  2 s  .co  m
static private ECPoint[] constructPublicAttributeKeys(BigInteger[] private_key, ECPoint fixed_point) {
    ECPoint[] public_key = new ECPoint[private_key.length];

    for (int i = 0; i < private_key.length; i++) {
        public_key[i] = fixed_point.multiply(private_key[i]);
    }

    return public_key;
}

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From source file:terminal.GateClient.java

License:Open Source License

public BigInteger[] proveAttribute(int attrIndex) {
    log.append("---> Get Attributes");
    BigInteger N = BigInteger.probablePrime(127, random);
    ECPoint nonce = c.getG().multiply(N);
    BigInteger[] attr = card.getAttribute(a[attrIndex].id, nonce);
    if (attr == null) {
        return null;
    }/*from w w  w  .  j a va  2s . c  o  m*/
    for (BigInteger ti : attr) {
        System.out.println("attr: " + ti);
    }

    // *** NONCE SIGNATURE VERIFICATION ***
    long start = System.nanoTime();
    ECPoint sn = reconstructPoint(c, attr[CardInterface.SIGNED_NONCE], false);
    ECPoint bk = reconstructPoint(c, attr[CardInterface.BLINDED_KEY], false);

    ECPoint bkn = bk.multiply(N);
    if (!bkn.equals(sn)) {
        log.append("Nonce signature verification failed (n.bk != sn)");
        if (!bkn.negate().equals(sn)) {
            log.append("Nonce signature verification failed (-n.bk != sn)");
            return null;
        } else {
            log.append("Nonce signature verification succeeded (-n.bk == sn)");
        }
    } else {
        log.append("Nonce signature verification succeeded (n.bk == sn)");
    }

    // *** PAIRING SIGNATURE VERIFICATION ***
    ECFieldElement e1 = c.R_atePairing(bk, saQ[attrIndex]);

    ECPoint bs = reconstructPoint(c, attr[CardInterface.BLINDED_SIGNATURE], false);
    ECFieldElement e2 = c.R_atePairing(bs, Q);

    ONE = new ECFieldElementFp12(new ECFieldElement.Fp(c.getQ(), BigInteger.valueOf(1)));

    if (!e1.equals(e2)) {
        log.append("Pairing signature verification failed (e1 != e2)");
        if (!ONE.equals(e1.multiply(e2))) {
            log.append("Pairing signature verification failed (!equals ONE)");
            return null;
        } else {
            log.append("Pairing signature verification succeeded (equals ONE)");
        }
    } else {
        log.append("Pairing signature verification succeeded (e1 == e2)");
    }

    long end = System.nanoTime();
    log.append("*** VERIFICATION ***");
    System.out.format(" d = %.2f ms\n", (end - start) / 1000000.0);
    return attr;
}

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