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

Question

异常(exception)情况:

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)

代码如下:

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

我假设您想要生成一个封装的 PKCS#8 私钥。

然而，PKCS#8 周围有内部和外部 DER 编码结构。内部结构是为了标识存储的 key ，即它会指示一个 RSA 私钥。这就是被包裹的东西。外部结构将指示私钥是如何包装的。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仅仅是因为你还没有生成它。该结构(部分)在 EncryptedPrivateKeyInfo 中定义。文档，我假设你可以使用 the constructor生成它。