import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
public void init(
    boolean                 forSigning,
    CipherParameters        param)
{
    if (forSigning)
    {
        if (param instanceof ParametersWithRandom)
        {
            ParametersWithRandom rParam = (ParametersWithRandom)param;

            this.random = rParam.getRandom();
            this.key = (GOST3410PrivateKeyParameters)rParam.getParameters();
        }
        else
        {
            this.random = new SecureRandom();
            this.key = (GOST3410PrivateKeyParameters)param;
        }
    }
    else
    {
        this.key = (GOST3410PublicKeyParameters)param;
    }
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
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();

    do
    {
        x = new BigInteger(256, random);
    }
    while (x.equals(ZERO) || x.compareTo(q) >= 0);

    //
    // calculate the public key.
    //
    y = a.modPow(x, p);

    return new AsymmetricCipherKeyPair(
            new GOST3410PublicKeyParameters(y, GOST3410Params),
            new GOST3410PrivateKeyParameters(x, GOST3410Params));
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
BCGOST3410PublicKey(
    GOST3410PublicKeyParameters params,
    GOST3410ParameterSpec spec)
{
    this.y = params.getY();
    this.gost3410Spec = spec;
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
public KeyPair generateKeyPair()
{
    if (!initialised)
    {
        init(new GOST3410ParameterSpec(CryptoProObjectIdentifiers.gostR3410_94_CryptoPro_A.getId()), new SecureRandom());
    }

    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));
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
static public 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());
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
/**
 * 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)
{
    byte[] mRev = new byte[message.length]; // conversion is little-endian
    for (int i = 0; i != mRev.length; i++)
    {
        mRev[i] = message[mRev.length - 1 - i];
    }
    
    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);
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
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 = new BigInteger(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));
}
 

import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters; //导入依赖的package包/类
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 = new BigInteger(256, random);

        if (x.signum() < 1 || x.compareTo(q) >= 0)
        {
            continue;
        }

        /*
         * Require a minimum weight of the NAF representation, since low-weight primes may be
         * weak against a version of the number-field-sieve for the discrete-logarithm-problem.
         * 
         * See "The number field sieve for integers of low weight", Oliver Schirokauer.
         */
        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));
}