Question

我已使用KeyPairGenerator生成RSA密钥对。如果我没错，KeyStore仅用于存储证书而不是密钥。如何在计算机上正确存储私钥？

Answer 1

您可以这样做：

 KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
 kpg.initialize(2048);

 KeyPair kp = kpg.genKeyPair();

 KeyFactory fact = KeyFactory.getInstance("RSA");

 RSAPublicKeySpec pub = fact.getKeySpec(kp.getPublic(),
        RSAPublicKeySpec.class);
 saveToFile(PUBLIC_KEY_FILE, 
        pub.getModulus(), pub.getPublicExponent());

 RSAPrivateKeySpec priv = fact.getKeySpec(kp.getPrivate(),
        RSAPrivateKeySpec.class);
 saveToFile(PRIVATE_KEY_FILE, 
         priv.getModulus(), priv.getPrivateExponent());

保存功能：

private static void saveToFile(String fileName,
                               BigInteger mod, BigInteger exp) 
    throws SomeException {
    ObjectOutputStream oout = new ObjectOutputStream(
            new BufferedOutputStream(new FileOutputStream(fileName)));
    try {
        oout.writeObject(mod);
        oout.writeObject(exp);
    } catch (Exception e) {
        throw new SomeException(e);
    } finally {
        oout.close();
    }
}

回读同样的方式：

private static PublicKey readPublicKey() throws SomeException {
    InputStream in = new FileInputStream(PUBLIC_KEY_FILE);
    ObjectInputStream oin =
            new ObjectInputStream(new BufferedInputStream(in));
    try {
        BigInteger m = (BigInteger) oin.readObject();
        BigInteger e = (BigInteger) oin.readObject();
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(m, e);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PublicKey pubKey = fact.generatePublic(keySpec);
        return pubKey;
    } catch (Exception e) {
        throw new SomeException(e);
    } finally {
        oin.close();
    }
}

阅读私钥类似。

Answer 2

这段代码将在AndroidKeyStore上生成并存储KeyPair。（注意：省略了异常捕获）

KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);

String alias = "my_key"; // replace as required or get it as a function argument

int nBefore = keyStore.size(); // debugging variable to help convince yourself this works

// Create the keys if necessary
if (!keyStore.containsAlias(alias)) {

    Calendar notBefore = Calendar.getInstance();
    Calendar notAfter = Calendar.getInstance();
    notAfter.add(Calendar.YEAR, 1);
    KeyPairGeneratorSpec spec = new KeyPairGeneratorSpec.Builder(this)
                    .setAlias(alias)
                    .setKeyType("RSA")
                    .setKeySize(2048)
                    .setSubject(new X500Principal("CN=test"))
                    .setSerialNumber(BigInteger.ONE)
                    .setStartDate(notBefore.getTime())
                    .setEndDate(notAfter.getTime())
                    .build();
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
    generator.initialize(spec);

    KeyPair keyPair = generator.generateKeyPair();
}
int nAfter = keyStore.size();
Log.v(TAG, "Before = " + nBefore + " After = " + nAfter);

// Retrieve the keys
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)keyStore.getEntry(alias, null);
RSAPrivateKey privateKey = (RSAPrivateKey) privateKeyEntry.getPrivateKey();
RSAPublicKey publicKey = (RSAPublicKey) privateKeyEntry.getCertificate().getPublicKey();

Log.v(TAG, "private key = " + privateKey.toString());
Log.v(TAG, "public key = " + publicKey.toString());

Answer 3

http://snipplr.com/view/18368/

OR

http://docs.oracle.com/javase/1.5.0/docs/api/java/security/KeyStore.html

OR

http://java.sun.com/docs/books/tutorial/security/apisign/vstep2.html 这是最有希望的

OR

在不受信任的环境中保护密钥是不可能的。您可以对代码进行模糊处理，也可以从任意变量创建密钥。最后，假设您使用标准的javax.crypto库，您必须调用Mac.getInstance（），稍后您将在该实例上调用init（）。想要你的钥匙的人会得到它。

但是，我认为解决方案是将密钥绑定到环境而不是程序。签名意味着数据源自已知来源，并且由于该来源提供而未被篡改。目前，您正试图说“保证我的程序生成了数据。”＃34;相反，将您的要求更改为＆＃34;保证我的程序的特定用户生成数据。＆＃34;然后责任转移给该用户以照顾他/她的钥匙。

Answer 4

根据私钥的格式，您可能需要将其转换为java keytool可以使用的格式。

但如果它是以keytool支持的格式，你应该能够使用keytool导入它。更多信息：

http://docs.oracle.com/javase/tutorial/security/toolfilex/rstep1.html

http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/keytool.html

如何在Java中使用keystore来存储私钥？

4 个答案: