Examples with RandomDSAKCalculator org.bouncycastle.crypto.signers.RandomDSAKCalculator used on opensource projects

Example 1 with RandomDSAKCalculator

use of org.bouncycastle.crypto.signers.RandomDSAKCalculator in project PCNGateway-Java-SDK by BSNDA.

the class Sm2SignUtil method xuperSignature.

public static byte[] xuperSignature(String privateKeyStr, byte[] message) throws Exception {
    PrivateKey privateKey = Sm2SignUtil.getPrivateKey(privateKeyStr.getBytes());
    BCECPrivateKey ecPrivateKey = (BCECPrivateKey) privateKey;
    X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");
    ECDomainParameters ec = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());
    // Order n
    BigInteger n = ec.getN();
    // Base point G
    ECPoint G = ec.getG();
    BigInteger r, s;
    // Get private key d
    BigInteger d = ecPrivateKey.getD();
    ECMultiplier basePointMultiplier = createBasePointMultiplier();
    DSAKCalculator kCalculator = new RandomDSAKCalculator();
    // Initialize the random number generator
    // if (kCalculator.isDeterministic()) {
    // kCalculator.init(n, d, message);
    // } else {
    kCalculator.init(n, new SecureRandom());
    do {
        // Calculate s
        BigInteger k;
        BigInteger e;
        BigInteger tmp;
        BigInteger tmp2;
        do {
            // Calculate r，refers to GM/T 0003.2-2012 6.1
            k = kCalculator.nextK();
            ECPoint p = basePointMultiplier.multiply(G, k).normalize();
            e = org.bouncycastle.util.BigIntegers.fromUnsignedByteArray(message);
            // r = (e + x) mod n
            r = p.getAffineXCoord().toBigInteger().add(e).mod(n);
        } while (r.equals(ZERO) || r.add(k).equals(n));
        // tmp = (1+d).inverse
        tmp = d.add(ONE).modInverse(n);
        // tmp2 = k - r*d
        tmp2 = k.subtract(r.multiply(d));
        s = tmp.multiply(tmp2).mod(n);
    } while (s.equals(ZERO));
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    DERSequenceGenerator seq = new DERSequenceGenerator(bos);
    seq.addObject(new ASN1Integer(r));
    seq.addObject(new ASN1Integer(s));
    seq.close();
    return bos.toByteArray();
}

Example 2 with RandomDSAKCalculator

use of org.bouncycastle.crypto.signers.RandomDSAKCalculator in project radixdlt by radixdlt.

the class BouncyCastleKeyHandler method sign.

@Override
public ECDSASignature sign(byte[] hash, byte[] privateKey, byte[] publicKey, boolean enforceLowS, boolean useDeterministicSignatures) {
    var signer = new ECDSASigner(useDeterministicSignatures ? new HMacDSAKCalculator(new SHA256Digest()) : new RandomDSAKCalculator());
    signer.init(true, new ECPrivateKeyParameters(new BigInteger(1, privateKey), domain));
    var components = signer.generateSignature(hash);
    var r = components[0];
    var s = components[1];
    if (enforceLowS) {
        s = s.compareTo(this.halfCurveOrder) <= 0 ? s : curveOrder.subtract(s);
    }
    return ECDSASignature.create(r, s, ECKeyUtils.calculateV(r, s, publicKey, hash));
}