Question

以下是例外：

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : DER input, Integer tag error
  at sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(Unknown Source)
  at java.security.KeyFactory.generatePrivate(Unknown Source)

Caused by: java.security.InvalidKeyException: IOException : DER input, Integer tag error at sun.security.pkcs.PKCS8Key.decode(Unknown Source)

以下是代码：

import java.io.*;
import java.security.*;
import java.security.KeyStore.PasswordProtection;
import java.security.cert.CertificateException;
import java.security.spec.*;

import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;

import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.encoders.Base64;

public class KeyPairUtil {

final static String keyStoreFile = "D:\\aeskey.jks";

private static final ASN1ObjectIdentifier AES = ASN1ObjectIdentifier.getInstance(NISTObjectIdentifiers.id_aes128_CBC);

public static void main(String[] args) throws Exception {

    final java.security.KeyPairGenerator gen = java.security.KeyPairGenerator.getInstance("RSA");
    gen.initialize(1024);
    final KeyPair keyPair = gen.generateKeyPair();
    wrapKeypairWithSymmetricKey(keyPair);
}

public static KeyPair wrapKeypairWithSymmetricKey(KeyPair keyPair) {

    try {
        PrivateKey priv = keyPair.getPrivate();
        SecretKey symmetricKey = getSymmetricKeyFromJKSFile();
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final IvParameterSpec iv = new IvParameterSpec(new byte[16]);
        cipher.init(Cipher.WRAP_MODE, symmetricKey, iv);
        System.out.println(iv.getIV());
        ASN1Encodable params = new DEROctetString(iv.getIV());
        AlgorithmIdentifier algId = new AlgorithmIdentifier(AES, params);
        byte[] wrappedKey = cipher.wrap(priv);
        KeyFactory keyFactory = KeyFactory.getInstance(priv.getAlgorithm());
        byte[] pkcs8enc = new EncryptedPrivateKeyInfo(algId, wrappedKey).getEncoded();
        EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(pkcs8enc);
        PrivateKey privateKey2 = keyFactory.generatePrivate(privateKeySpec); //throwing error in this line
        KeyPair keypair = new KeyPair(keyPair.getPublic(), privateKey2);
        return keypair;
    } catch (NoSuchAlgorithmException | InvalidKeyException | InvalidKeySpecException | NoSuchPaddingException | IllegalBlockSizeException | IOException | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }
    return null;
}

private static SecretKey getSymmetricKeyFromJKSFile() {

    String jkspassword = "password";
    PasswordProtection keyPassword = new PasswordProtection("keypassword".toCharArray());
    try {
        KeyStore keyStore = loadKeyStore(keyStoreFile, jkspassword);
        // retrieve the stored key back
        KeyStore.Entry entry = keyStore.getEntry("keyentry", keyPassword);
        SecretKey keyFound = ((KeyStore.SecretKeyEntry) entry).getSecretKey();
        return keyFound;
    } catch (CertificateException | IOException | NoSuchAlgorithmException | UnrecoverableEntryException | KeyStoreException e) {
        e.printStackTrace();
    }
    return null;
}

private static KeyStore loadKeyStore(String fileName, String jkspassword) throws KeyStoreException, NoSuchAlgorithmException, CertificateException, FileNotFoundException, IOException {

    File file = new File(fileName);
    final KeyStore keyStore = KeyStore.getInstance("JCEKS");
    if (file.exists()) {
        keyStore.load(new FileInputStream(file), jkspassword.toCharArray());
    }
    return keyStore;
}
}

我希望有人知道如何解决？

Answer 1

我假设您要生成一个包装好的PKCS＃8私钥。

然而，PKCS＃8在其周围具有内部和外部DER编码结构。内部结构用于识别存储的密钥，即它将指示RSA私钥。这就是被包裹的东西。外部结构将指示私钥是如何被包装的。这是目前所缺少的。

所以发生的事情是解析器没有找到外部结构只是因为你还没有生成它。该结构（部分）在EncryptedPrivateKeyInfo文档中定义，我假设您可以使用the constructor生成它。

Answer 2

我在使用的 Java 应用程序中遇到了类似的问题。结果证明私钥（PEM 格式）格式不正确。

查看 this post from comodo 以验证私钥是否有效并与公钥匹配。

java.security.spec.InvalidKeySpecException：java.security.InvalidKeyException：IOException：DER输入，整数标记错误

2 个答案: