Java RSAPrivateKey.getModulus方法代码示例

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
public static String encrypt(byte[] keyBytes, String plainText)
		throws Exception {
	PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
	KeyFactory factory = KeyFactory.getInstance("RSA");
	PrivateKey privateKey = factory.generatePrivate(spec);
	Cipher cipher = Cipher.getInstance("RSA");
       try {
	    cipher.init(Cipher.ENCRYPT_MODE, privateKey);
       } catch (InvalidKeyException e) {
           //For IBM JDK, 原因请看解密方法中的说明
           RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
           RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(rsaPrivateKey.getModulus(), rsaPrivateKey.getPrivateExponent());
           Key fakePublicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec);
           cipher = Cipher.getInstance("RSA");
           cipher.init(Cipher.ENCRYPT_MODE, fakePublicKey);
       }

	byte[] encryptedBytes = cipher.doFinal(plainText.getBytes("UTF-8"));
	String encryptedString = Base64.byteArrayToBase64(encryptedBytes);

	return encryptedString;
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
/**
 *
 * 生成KeyPair
 * @return
 * @throws Exception
 */
public static Map<String, Object> generateKeyPair() throws Exception {
    KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
    keyPairGen.initialize(KEYSIZE);
    KeyPair keyPair = keyPairGen.generateKeyPair();

    // 公钥
    RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

    // 私钥
    RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
    BigInteger modules = privateKey.getModulus();

    Map<String, Object> keys = new HashMap<String, Object>(3);
    keys.put(PUBLIC_KEY, publicKey);
    keys.put(PRIVATE_KEY, privateKey);
    keys.put(MODULES, modules);
    return keys;
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
public static String encrypt(byte[] keyBytes, String plainText)
        throws Exception {
    PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
    KeyFactory factory = KeyFactory.getInstance("RSA");
    PrivateKey privateKey = factory.generatePrivate(spec);
    Cipher cipher = Cipher.getInstance("RSA");
    try {
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    } catch (InvalidKeyException e) {
        //For IBM JDK
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
        RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(rsaPrivateKey.getModulus(), rsaPrivateKey.getPrivateExponent());
        Key fakePublicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec);
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, fakePublicKey);
    }

    byte[] encryptedBytes = cipher.doFinal(plainText.getBytes("UTF-8"));
    String encryptedString = Base64.byteArrayToBase64(encryptedBytes);

    return encryptedString;
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
public static RSAKeyParameters generateRSAPrivateKeyParameter(RSAPrivateKey key) {
    ParamUtil.requireNonNull("key", key);
    if (key instanceof RSAPrivateCrtKey) {
        RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;

        return new RSAPrivateCrtKeyParameters(rsaKey.getModulus(), rsaKey.getPublicExponent(),
                rsaKey.getPrivateExponent(), rsaKey.getPrimeP(), rsaKey.getPrimeQ(),
                rsaKey.getPrimeExponentP(), rsaKey.getPrimeExponentQ(),
                rsaKey.getCrtCoefficient());
    } else {
        return new RSAKeyParameters(true, key.getModulus(), key.getPrivateExponent());
    }
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
JCERSAPrivateKey(
    RSAPrivateKey key)
{
    this.modulus = key.getModulus();
    this.privateExponent = key.getPrivateExponent();
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
BCRSAPrivateKey(
    RSAPrivateKey key)
{
    this.modulus = key.getModulus();
    this.privateExponent = key.getPrivateExponent();
}
 

import java.security.interfaces.RSAPrivateKey; //导入方法依赖的package包/类
public static void main(String[] args) throws NoSuchAlgorithmException,
        NoSuchProviderException, InvalidKeySpecException {
    // Generate the first key.
    KeyPairGenerator generator
            = KeyPairGenerator.getInstance(KEYALG, PROVIDER_NAME);
    KeyPair keyPair = generator.generateKeyPair();
    RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
    if (!(rsaPrivateKey instanceof RSAPrivateCrtKey)) {
        System.err.println("rsaPrivateKey class : " + rsaPrivateKey.getClass().getName());
        throw new RuntimeException("rsaPrivateKey is not a RSAPrivateCrtKey instance");
    }

    // Generate the second key.
    KeyFactory factory = KeyFactory.getInstance(KEYALG, PROVIDER_NAME);
    RSAPrivateKeySpec rsaPrivateKeySpec = new RSAPrivateKeySpec(
            rsaPrivateKey.getModulus(), rsaPrivateKey.getPrivateExponent());
    RSAPrivateKey rsaPrivateKey2 = (RSAPrivateKey) factory.generatePrivate(
            rsaPrivateKeySpec);

    // Generate the third key.
    PKCS8EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(
            rsaPrivateKey.getEncoded());
    RSAPrivateKey rsaPrivateKey3 = (RSAPrivateKey) factory.generatePrivate(
            encodedKeySpec);

    // Check for equality.
    if (rsaPrivateKey.equals(rsaPrivateKey2)) {
        throw new RuntimeException("rsaPrivateKey should not equal to rsaPrivateKey2");
    }
    if (!rsaPrivateKey3.equals(rsaPrivateKey)) {
        throw new RuntimeException("rsaPrivateKey3 should equal to rsaPrivateKey");
    }
    if (rsaPrivateKey3.equals(rsaPrivateKey2)) {
        throw new RuntimeException("rsaPrivateKey3 should not equal to rsaPrivateKey2");
    }
    if (rsaPrivateKey2.equals(rsaPrivateKey3)) {
        throw new RuntimeException("rsaPrivateKey2 should not equal to rsaPrivateKey3");
    }

    // Generate the fourth key.
    RSAPrivateCrtKey rsaPrivateCrtKey =  (RSAPrivateCrtKey)rsaPrivateKey;
    RSAPrivateCrtKeySpec rsaPrivateCrtKeySpec = new RSAPrivateCrtKeySpec(
            rsaPrivateCrtKey.getModulus(),
            rsaPrivateCrtKey.getPublicExponent(),
            rsaPrivateCrtKey.getPrivateExponent(),
            rsaPrivateCrtKey.getPrimeP(),
            rsaPrivateCrtKey.getPrimeQ(),
            rsaPrivateCrtKey.getPrimeExponentP(),
            rsaPrivateCrtKey.getPrimeExponentQ(),
            rsaPrivateCrtKey.getCrtCoefficient()
        );
    RSAPrivateCrtKey rsaPrivateKey4 = (RSAPrivateCrtKey) factory.generatePrivate(
            rsaPrivateCrtKeySpec);
    if (!rsaPrivateKey.equals(rsaPrivateKey4)) {
        throw new RuntimeException("rsaPrivateKey should equal to rsaPrivateKey4");
    }
}