Java 将 key 保存到 keystore KeyStoreException

Question

我尝试生成一个 RSA CA key 对和证书并将其保存到 keystore 。 我的代码是:

import java.io.FileOutputStream;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.SecureRandom;
import java.security.Security;
import java.security.cert.X509Certificate;
import java.util.Date;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.X509v3CertificateBuilder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;

    private static final  String storeType = "PKCS12";
        private static final  String storePassword = "password";
        private static final  String storePath = "/usr/lib/java/keystore.ks";
        private static final Date startDate = new Date(System.currentTimeMillis());                                         // time from which certificate is valid
        private static final Date expiryDate = new Date(System.currentTimeMillis() + 2L * 365L * 24L * 60L * 60L * 1000L);   // time after which certificate is not valid (2 years)
        private static final BigInteger serialNumber = BigInteger.valueOf(System.currentTimeMillis());  
        private static X500Name issuer;
        private static X500Name subject; 
        private static KeyPair pair;

        public static void saveKeys() throws Exception{
            Security.addProvider(new BouncyCastleProvider());

            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
            keyPairGen.initialize(2048, new SecureRandom());
            pair = keyPairGen.generateKeyPair();
            byte[] pub = pair.getPublic().getEncoded();
            byte[] priv = pair.getPrivate().getEncoded();
            SubjectPublicKeyInfo pubInfo = SubjectPublicKeyInfo.getInstance(pub);

            issuer = new X500Name("CN=CA");
            subject = issuer;

            X509v3CertificateBuilder certBuilder = new X509v3CertificateBuilder(
                  issuer,       //issuer (CA)
                  serialNumber,
                  startDate, expiryDate,
                  subject,      //subject
                  pubInfo);

            //signature for sig
            ContentSigner sigGen = new JcaContentSignerBuilder("SHA1WithRSA").build(pair.getPrivate());
            X509CertificateHolder certHolder = certBuilder.build(sigGen);
            X509Certificate caCert = new JcaX509CertificateConverter().getCertificate(certHolder);

            X509Certificate[] chain = new X509Certificate[3];
            chain[2] = caCert;

            KeyStore store;
            try {
                store = KeyStore.getInstance(storeType);
                store.load(null,null);
            store.setKeyEntry("CA-Key", priv, chain);  
            store.store(new FileOutputStream("public.p12"), null);

            } catch (Exception e) {
                e.printStackTrace();
            } 

然后我得到错误:

java.security.KeyStoreException: Private key is not stored as PKCS#8 EncryptedPrivateKeyInfo: java.io.IOException: overrun, bytes = 1194
    at sun.security.pkcs12.PKCS12KeyStore.engineSetKeyEntry(PKCS12KeyStore.java:687)
    at java.security.KeyStore.setKeyEntry(KeyStore.java:1174)
    at storeKeys.saveKeys(storeKeys.java:95)
    at storeKeys.main(storeKeys.java:146)
Caused by: java.io.IOException: overrun, bytes = 1194

如何将私钥加密为正确的格式？我可以在哪里为 keystore 提供保存 key 的路径？

Answer 1

如果您看到该方法的 java 文档，它说:

Assigns the given key (that has already been protected) to the given alias.

If the protected key is of type java.security.PrivateKey, it must be accompanied by a certificate chain certifying the corresponding public key. If the underlying keystore implementation is of type jks, key must be encoded as an EncryptedPrivateKeyInfo as defined in the PKCS #8 standard.

它说 JKS，但看起来它也期待 PKCS12 的加密私钥格式。

所以你不能只传入私钥字节数组。

为了让事情更简单，你可以这样做:

PrivateKeyEntry privateKeyEntry = new PrivateKeyEntry(pair.getPrivate(), chain);
store.setEntry("CA-Key", privateKeyEntry, new KeyStore.PasswordProtection(storePassword.toCharArray()));

在您的 keystore.store(..) 方法中，第一个参数是 keystore 路径。第二个参数是 keystore 的密码。

所以你可以这样做:

store.store(new FileOutputStream(new File(storePath)), storePassword.toCharArray());