Java DSAParams.getG方法代碼示例

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Internal method to create a new key with inherited key parameters.
 *
 * @param keyValueKey key from which to obtain key value
 * @param keyParamsKey key from which to obtain key parameters
 * @return new public key having value and parameters
 * @throws CertPathValidatorException if keys are not appropriate types
 * for this operation
 */
static PublicKey makeInheritedParamsKey(PublicKey keyValueKey,
    PublicKey keyParamsKey) throws CertPathValidatorException
{
    if (!(keyValueKey instanceof DSAPublicKey) ||
        !(keyParamsKey instanceof DSAPublicKey))
        throw new CertPathValidatorException("Input key is not " +
                                             "appropriate type for " +
                                             "inheriting parameters");
    DSAParams params = ((DSAPublicKey)keyParamsKey).getParams();
    if (params == null)
        throw new CertPathValidatorException("Key parameters missing");
    try {
        BigInteger y = ((DSAPublicKey)keyValueKey).getY();
        KeyFactory kf = KeyFactory.getInstance("DSA");
        DSAPublicKeySpec ks = new DSAPublicKeySpec(y,
                                                   params.getP(),
                                                   params.getQ(),
                                                   params.getG());
        return kf.generatePublic(ks);
    } catch (GeneralSecurityException e) {
        throw new CertPathValidatorException("Unable to generate key with" +
                                             " inherited parameters: " +
                                             e.getMessage(), e);
    }
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
public void regenerateLocalPublicKey(KeyFactory factory, String fullUserId, DSAPrivateKey privKey) {

        String userId = Address.stripResource(fullUserId);

        BigInteger x = privKey.getX();
        DSAParams params = privKey.getParams();
        BigInteger y = params.getG().modPow(x, params.getP());
        DSAPublicKeySpec keySpec = new DSAPublicKeySpec(y, params.getP(), params.getQ(), params.getG());
        PublicKey pubKey;
        try {
            pubKey = factory.generatePublic(keySpec);
            storeLocalPublicKey(userId, pubKey);

        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
public PublicKey getPublicKey() throws GeneralSecurityException {
    if (privateKey instanceof DSAPrivateKey) {
        DSAPrivateKey dsa = (DSAPrivateKey) privateKey;
        DSAParams params = dsa.getParams();
        BigInteger g = params.getG();
        BigInteger p = params.getP();
        BigInteger q = params.getQ();
        BigInteger x = dsa.getX();
        BigInteger y = q.modPow( x, p );
        DSAPublicKeySpec dsaKeySpec = new DSAPublicKeySpec(y, p, q, g);
        return KeyFactory.getInstance("DSA").generatePublic(dsaKeySpec);
    } else if (privateKey instanceof RSAPrivateCrtKey) {
        RSAPrivateCrtKey rsa = (RSAPrivateCrtKey) privateKey;
        RSAPublicKeySpec rsaKeySpec = new RSAPublicKeySpec(
                rsa.getModulus(),
                rsa.getPublicExponent()
        );
        return KeyFactory.getInstance("RSA").generatePublic(rsaKeySpec);
    } else {
        throw new GeneralSecurityException("Not an RSA or DSA key");
    }
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
public DOMKeyValue(PublicKey key)  throws KeyException {
    if (key == null) {
        throw new NullPointerException("key cannot be null");
    }
    this.publicKey = key;
    if (key instanceof DSAPublicKey) {
        DSAPublicKey dkey = (DSAPublicKey) key;
        DSAParams params = dkey.getParams();
        p = new DOMCryptoBinary(params.getP());
        q = new DOMCryptoBinary(params.getQ());
        g = new DOMCryptoBinary(params.getG());
        y = new DOMCryptoBinary(dkey.getY());
    } else if (key instanceof RSAPublicKey) {
        RSAPublicKey rkey = (RSAPublicKey) key;
        exponent = new DOMCryptoBinary(rkey.getPublicExponent());
        modulus = new DOMCryptoBinary(rkey.getModulus());
    } else {
        throw new KeyException("unsupported key algorithm: " +
            key.getAlgorithm());
    }
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Initializes the DSA object using a DSA parameter object.
 *
 * @param params a fully initialized DSA parameter object.
 */
public void initialize(DSAParams params, SecureRandom random) {
    if (params == null) {
        throw new InvalidParameterException("Params must not be null");
    }
    DSAParameterSpec spec = new DSAParameterSpec
                            (params.getP(), params.getQ(), params.getG());
    initialize0(spec, random);
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
DSA(PublicKey key) throws KeyException {
    super(key);
    DSAPublicKey dkey = (DSAPublicKey) key;
    DSAParams params = dkey.getParams();
    p = new DOMCryptoBinary(params.getP());
    q = new DOMCryptoBinary(params.getQ());
    g = new DOMCryptoBinary(params.getG());
    y = new DOMCryptoBinary(dkey.getY());
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Initializes the DSA object using a DSA parameter object.
 *
 * @param params a fully initialized DSA parameter object.
 */
@Override
public void initialize(DSAParams params, SecureRandom random)
        throws InvalidParameterException {

    if (params == null) {
        throw new InvalidParameterException("Params must not be null");
    }
    DSAParameterSpec spec = new DSAParameterSpec
                            (params.getP(), params.getQ(), params.getG());
    initialize0(spec, random);
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Initializes the DSA object using a DSA parameter object.
 *
 * @param params a fully initialized DSA parameter object.
 */
@Override
public void initialize(DSAParams params, SecureRandom random)
    throws InvalidParameterException {
    if (params == null) {
        throw new InvalidParameterException("Params must not be null");
     }
     DSAParameterSpec spec = new DSAParameterSpec
         (params.getP(), params.getQ(), params.getG());
     super.init(spec, random, false);
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
public static Object convertToTrilead(PublicKey pk) {
	if (pk instanceof RSAPublicKey) {
		return new com.trilead.ssh2.signature.RSAPublicKey(
				((RSAPublicKey) pk).getPublicExponent(),
				((RSAPublicKey) pk).getModulus());
	} else if (pk instanceof DSAPublicKey) {
		DSAParams dp = ((DSAPublicKey) pk).getParams();
		return new com.trilead.ssh2.signature.DSAPublicKey(
					dp.getP(), dp.getQ(), dp.getG(), ((DSAPublicKey) pk).getY());
	}

	throw new IllegalArgumentException("PublicKey is not RSA or DSA format");
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
private Boolean verify(byte[] b, PublicKey pubKey, BigInteger r, BigInteger s)
        throws OtrCryptoException {

    if (!(pubKey instanceof DSAPublicKey))
        throw new IllegalArgumentException();

    DSAParams dsaParams = ((DSAPublicKey) pubKey).getParams();

    BigInteger q = dsaParams.getQ();
    DSAParameters bcDSAParams = new DSAParameters(dsaParams.getP(), q, dsaParams.getG());

    DSAPublicKey dsaPrivateKey = (DSAPublicKey) pubKey;
    DSAPublicKeyParameters dsaPrivParms = new DSAPublicKeyParameters(dsaPrivateKey.getY(),
            bcDSAParams);

    // Ian: Note that if you can get the standard DSA implementation you're
    // using to not hash its input, you should be able to pass it ((256-bit
    // value) mod q), (rather than truncating the 256-bit value) and all
    // should be well.
    // ref: Interop problems with libotr - DSA signature
    DSASigner dsaSigner = new DSASigner();
    dsaSigner.init(false, dsaPrivParms);

    BigInteger bmpi = new BigInteger(1, b);
    Boolean result = dsaSigner.verifySignature(BigIntegers.asUnsignedByteArray(bmpi.mod(q)), r,
            s);
    return result;
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Internal method to create a new key with inherited key parameters
 *
 * @param keyValueKey key from which to obtain key value
 * @param keyParamsKey key from which to obtain key parameters
 * @return new public key having value and parameters
 * @throws CertPathValidatorException if keys are not appropriate types
 * for this operation
 */
static PublicKey makeInheritedParamsKey(PublicKey keyValueKey,
    PublicKey keyParamsKey) throws CertPathValidatorException
{
    PublicKey usableKey;
    if (!(keyValueKey instanceof DSAPublicKey) ||
        !(keyParamsKey instanceof DSAPublicKey))
        throw new CertPathValidatorException("Input key is not " +
                                             "appropriate type for " +
                                             "inheriting parameters");
    DSAParams params = ((DSAPublicKey)keyParamsKey).getParams();
    if (params == null)
        throw new CertPathValidatorException("Key parameters missing");
    try {
        BigInteger y = ((DSAPublicKey)keyValueKey).getY();
        KeyFactory kf = KeyFactory.getInstance("DSA");
        DSAPublicKeySpec ks = new DSAPublicKeySpec(y,
                                                   params.getP(),
                                                   params.getQ(),
                                                   params.getG());
        usableKey = kf.generatePublic(ks);
    } catch (GeneralSecurityException e) {
        throw new CertPathValidatorException("Unable to generate key with" +
                                             " inherited parameters: " +
                                             e.getMessage(), e);
    }
    return usableKey;
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/** {@inheritDoc} */
public void initSign() {
	if (signKey == null) {
		throw new IllegalStateException(
				"Sign key must be set prior to initialization.");
	}

	final DSAPrivateKey privKey = (DSAPrivateKey) signKey;
	final DSAParams params = privKey.getParams();
	final DSAPrivateKeyParameters bcParams = new DSAPrivateKeyParameters(
			privKey.getX(), new DSAParameters(params.getP(), params.getQ(),
					params.getG()));
	init(true, bcParams);
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/** {@inheritDoc} */
public void initVerify() {
	if (verifyKey == null) {
		throw new IllegalStateException(
				"Verify key must be set prior to initialization.");
	}

	final DSAPublicKey pubKey = (DSAPublicKey) verifyKey;
	final DSAParams params = pubKey.getParams();
	final DSAPublicKeyParameters bcParams = new DSAPublicKeyParameters(
			pubKey.getY(), new DSAParameters(params.getP(), params.getQ(),
					params.getG()));
	init(false, bcParams);
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Initializes this signature object with PrivateKey object 
 * passed as argument to the method.
 *
 * @params
 *    privateKey DSAPrivateKey object
 * @throws
 *    InvalidKeyException if privateKey is not DSAPrivateKey object
 */
protected void engineInitSign(PrivateKey privateKey)
        throws InvalidKeyException {

    DSAParams params;

    // parameters and private key
    BigInteger p, q, g, x;

    int n;

    if (privateKey == null || !(privateKey instanceof DSAPrivateKey)) {
        throw new InvalidKeyException(
                Messages.getString("security.168")); //$NON-NLS-1$
    }

    params = ((DSAPrivateKey) privateKey).getParams();
    p = params.getP();
    q = params.getQ();
    g = params.getG();
    x = ((DSAPrivateKey) privateKey).getX();

    // checks described in DSA standard
    n = p.bitLength();
    if (p.compareTo(BigInteger.valueOf(1)) != 1 || n < 512 || n > 1024
            || (n & 077) != 0) {
        throw new InvalidKeyException(Messages.getString("security.169")); //$NON-NLS-1$
    }
    if (q.signum() != 1 && q.bitLength() != 160) {
        throw new InvalidKeyException(Messages.getString("security.16A")); //$NON-NLS-1$
    }
    if (x.signum() != 1 || x.compareTo(q) != -1) {
        throw new InvalidKeyException(Messages.getString("security.16B")); //$NON-NLS-1$
    }

    dsaKey = (DSAKey) privateKey;

    msgDigest.reset();
}
 

import java.security.interfaces.DSAParams; //導入方法依賴的package包/類
/**
 * Initializes this signature object with PublicKey object 
 * passed as argument to the method.
 *
 * @params
 *    publicKey DSAPublicKey object
 * @throws
 *    InvalidKeyException if publicKey is not DSAPublicKey object
 */
protected void engineInitVerify(PublicKey publicKey)
        throws InvalidKeyException {

    // parameters and public key
    BigInteger p, q, g, y;

    int n1;

    if (publicKey == null || !(publicKey instanceof DSAPublicKey)) {
        throw new InvalidKeyException(
                Messages.getString("security.16C")); //$NON-NLS-1$
    }

    DSAParams params = ((DSAPublicKey) publicKey).getParams();
    p = params.getP();
    q = params.getQ();
    g = params.getG();
    y = ((DSAPublicKey) publicKey).getY();

    // checks described in DSA standard
    n1 = p.bitLength();
    if (p.compareTo(BigInteger.valueOf(1)) != 1 || n1 < 512 || n1 > 1024
            || (n1 & 077) != 0) {
        throw new InvalidKeyException(Messages.getString("security.169")); //$NON-NLS-1$
    }
    if (q.signum() != 1 || q.bitLength() != 160) {
        throw new InvalidKeyException(Messages.getString("security.16A")); //$NON-NLS-1$
    }
    if (y.signum() != 1) {
        throw new InvalidKeyException(Messages.getString("security.16D")); //$NON-NLS-1$
    }

    dsaKey = (DSAKey) publicKey;

    msgDigest.reset();
}