Examples with GOST3410PublicKeyParameters com.github.zhenwei.core.crypto.params.GOST3410PublicKeyParameters used on opensource projects

Example 1 with GOST3410PublicKeyParameters

use of com.github.zhenwei.core.crypto.params.GOST3410PublicKeyParameters in project LinLong-Java by zhenwei1108.

the class GOST3410KeyPairGenerator method generateKeyPair.

public AsymmetricCipherKeyPair generateKeyPair() {
    BigInteger p, q, a, x, y;
    GOST3410Parameters GOST3410Params = param.getParameters();
    SecureRandom random = param.getRandom();
    q = GOST3410Params.getQ();
    p = GOST3410Params.getP();
    a = GOST3410Params.getA();
    int minWeight = 64;
    for (; ; ) {
        x = BigIntegers.createRandomBigInteger(256, random);
        if (x.signum() < 1 || x.compareTo(q) >= 0) {
            continue;
        }
        if (WNafUtil.getNafWeight(x) < minWeight) {
            continue;
        }
        break;
    }
    // 
    // calculate the public key.
    // 
    y = a.modPow(x, p);
    return new AsymmetricCipherKeyPair(new GOST3410PublicKeyParameters(y, GOST3410Params), new GOST3410PrivateKeyParameters(x, GOST3410Params));
}

Example 2 with GOST3410PublicKeyParameters

use of com.github.zhenwei.core.crypto.params.GOST3410PublicKeyParameters in project LinLong-Java by zhenwei1108.

the class KeyPairGeneratorSpi method generateKeyPair.

public KeyPair generateKeyPair() {
    if (!initialised) {
        init(new GOST3410ParameterSpec(CryptoProObjectIdentifiers.gostR3410_94_CryptoPro_A.getId()), CryptoServicesRegistrar.getSecureRandom());
    }
    AsymmetricCipherKeyPair pair = engine.generateKeyPair();
    GOST3410PublicKeyParameters pub = (GOST3410PublicKeyParameters) pair.getPublic();
    GOST3410PrivateKeyParameters priv = (GOST3410PrivateKeyParameters) pair.getPrivate();
    return new KeyPair(new BCGOST3410PublicKey(pub, gost3410Params), new BCGOST3410PrivateKey(priv, gost3410Params));
}

Example 3 with GOST3410PublicKeyParameters

use of com.github.zhenwei.core.crypto.params.GOST3410PublicKeyParameters in project LinLong-Java by zhenwei1108.

the class GOST3410Util method generatePublicKeyParameter.

public static AsymmetricKeyParameter generatePublicKeyParameter(PublicKey key) throws InvalidKeyException {
    if (key instanceof GOST3410PublicKey) {
        GOST3410PublicKey k = (GOST3410PublicKey) key;
        GOST3410PublicKeyParameterSetSpec p = k.getParameters().getPublicKeyParameters();
        return new GOST3410PublicKeyParameters(k.getY(), new GOST3410Parameters(p.getP(), p.getQ(), p.getA()));
    }
    throw new InvalidKeyException("can't identify GOST3410 public key: " + key.getClass().getName());
}

Example 4 with GOST3410PublicKeyParameters

use of com.github.zhenwei.core.crypto.params.GOST3410PublicKeyParameters in project LinLong-Java by zhenwei1108.

the class GOST3410Signer method verifySignature.

/**
 * return true if the value r and s represent a GOST3410 signature for the passed in message for
 * standard GOST3410 the message should be a GOST3411 hash of the real message to be verified.
 */
public boolean verifySignature(byte[] message, BigInteger r, BigInteger s) {
    // conversion is little-endian
    byte[] mRev = Arrays.reverse(message);
    BigInteger m = new BigInteger(1, mRev);
    GOST3410Parameters params = key.getParameters();
    BigInteger zero = BigInteger.valueOf(0);
    if (zero.compareTo(r) >= 0 || params.getQ().compareTo(r) <= 0) {
        return false;
    }
    if (zero.compareTo(s) >= 0 || params.getQ().compareTo(s) <= 0) {
        return false;
    }
    BigInteger v = m.modPow(params.getQ().subtract(new BigInteger("2")), params.getQ());
    BigInteger z1 = s.multiply(v).mod(params.getQ());
    BigInteger z2 = (params.getQ().subtract(r)).multiply(v).mod(params.getQ());
    z1 = params.getA().modPow(z1, params.getP());
    z2 = ((GOST3410PublicKeyParameters) key).getY().modPow(z2, params.getP());
    BigInteger u = z1.multiply(z2).mod(params.getP()).mod(params.getQ());
    return u.equals(r);
}