Examples with X9IntegerConverter org.spongycastle.asn1.x9.X9IntegerConverter used on opensource projects

Example 1 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project XobotOS by xamarin.

the class JCEECPublicKey method populateFromPubKeyInfo.

private void populateFromPubKeyInfo(SubjectPublicKeyInfo info) {
    // BEGIN android-removed
    // if (info.getAlgorithmId().getObjectId().equals(CryptoProObjectIdentifiers.gostR3410_2001))
    // {
    //     DERBitString bits = info.getPublicKeyData();
    //     ASN1OctetString key;
    //     this.algorithm = "ECGOST3410";
    //
    //     try
    //     {
    //         key = (ASN1OctetString) ASN1Object.fromByteArray(bits.getBytes());
    //     }
    //     catch (IOException ex)
    //     {
    //         throw new IllegalArgumentException("error recovering public key");
    //     }
    //
    //     byte[]          keyEnc = key.getOctets();
    //     byte[]          x = new byte[32];
    //     byte[]          y = new byte[32];
    //
    //     for (int i = 0; i != x.length; i++)
    //     {
    //         x[i] = keyEnc[32 - 1 - i];
    //     }
    //
    //     for (int i = 0; i != y.length; i++)
    //     {
    //         y[i] = keyEnc[64 - 1 - i];
    //     }
    //
    //     gostParams = new GOST3410PublicKeyAlgParameters((ASN1Sequence)info.getAlgorithmId().getParameters());
    //
    //     ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
    //
    //     ECCurve curve = spec.getCurve();
    //     EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
    //
    //     this.q = curve.createPoint(new BigInteger(1, x), new BigInteger(1, y), false);
    //
    //     ecSpec = new ECNamedCurveSpec(
    //             ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()),
    //             ellipticCurve,
    //             new ECPoint(
    //                     spec.getG().getX().toBigInteger(),
    //                     spec.getG().getY().toBigInteger()),
    //                     spec.getN(), spec.getH());
    //
    // }
    // else
    // END android-removed
    {
        X962Parameters params = new X962Parameters((DERObject) info.getAlgorithmId().getParameters());
        ECCurve curve;
        EllipticCurve ellipticCurve;
        if (params.isNamedCurve()) {
            DERObjectIdentifier oid = (DERObjectIdentifier) params.getParameters();
            X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
            curve = ecP.getCurve();
            ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
            ecSpec = new ECNamedCurveSpec(ECUtil.getCurveName(oid), ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH());
        } else if (params.isImplicitlyCA()) {
            ecSpec = null;
            curve = ProviderUtil.getEcImplicitlyCa().getCurve();
        } else {
            X9ECParameters ecP = new X9ECParameters((ASN1Sequence) params.getParameters());
            curve = ecP.getCurve();
            ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
            this.ecSpec = new ECParameterSpec(ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH().intValue());
        }
        DERBitString bits = info.getPublicKeyData();
        byte[] data = bits.getBytes();
        ASN1OctetString key = new DEROctetString(data);
        //
        if (data[0] == 0x04 && data[1] == data.length - 2 && (data[2] == 0x02 || data[2] == 0x03)) {
            int qLength = new X9IntegerConverter().getByteLength(curve);
            if (qLength >= data.length - 3) {
                try {
                    key = (ASN1OctetString) ASN1Object.fromByteArray(data);
                } catch (IOException ex) {
                    throw new IllegalArgumentException("error recovering public key");
                }
            }
        }
        X9ECPoint derQ = new X9ECPoint(curve, key);
        this.q = derQ.getPoint();
    }
}

Example 2 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project rskj by rsksmart.

the class ECKey method decompressKey.

/**
 * Decompress a compressed public key (x co-ord and low-bit of y-coord).
 *
 * @param xBN -
 * @param yBit -
 * @return -
 */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
    X9IntegerConverter x9 = new X9IntegerConverter();
    byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
    compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
    return CURVE.getCurve().decodePoint(compEnc);
}

Example 3 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project web3sdk by FISCO-BCOS.

the class Sign method decompressKey.

/**
 * Decompress a compressed public key (x co-ord and low-bit of y-coord).
 */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
    X9IntegerConverter x9 = new X9IntegerConverter();
    byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
    compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
    return CURVE.getCurve().decodePoint(compEnc);
}

Example 4 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project java-tron by tronprotocol.

the class ECKey method decompressKey.

/**
 * Decompress a compressed public key (x co-ord and low-bit of y-coord).
 *
 * @param xBN -
 * @param yBit -
 * @return -
 */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
    X9IntegerConverter x9 = new X9IntegerConverter();
    byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
    compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
    return CURVE.getCurve().decodePoint(compEnc);
}

Example 5 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project toshi-android-client by toshiapp.

the class ECKey method decompressKey.

/**
 * Decompress a compressed public key (x co-ord and low-bit of y-coord).
 *
 * @param xBN -
 * @param yBit -
 * @return -
 */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
    X9IntegerConverter x9 = new X9IntegerConverter();
    byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
    compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
    return CURVE.getCurve().decodePoint(compEnc);
}