序列化和反序列化RSA公钥 [英] Serialize and Deserialize an RSA public key

问题描述

  KeyPairGenerator kpg = KeyPairGenerator.getInstance（RSA）; 
 kpg.initialize（1024）; 
 KeyPair kp = kpg.genKeyPair（）; 
 Key publicKey = kp.getPublic（）; 
 Key privateKey = kp.getPrivate（）; 
  

我想从 byte []中创建公钥。

我试过这个作为实验：

  publicKey = new SecretKeySpec（publicKey.getEncoded（），publicKey.getAlgorithm（））; 
  

但是使用该密钥解密则失败。

<我还尝试使用 ObjectOutputStream 序列化密钥，但序列化失败。

java.io.NotSerializableException：org.apache.harmony.xnet.provider.jsse.OpenSSLKey

我读了这里我无法使用使用RSA的SecretKeySpec 。

所以只要您谈论的是SecretKey而不是RSA或DSA关键，那么你不必经历涉及KeyGenerator等的任何扭曲。

任何人都知道如何执行这些扭曲或这样做。

解决方案

来自RSA的非对称密钥通常以X509格式存储。因此，您可以使用 X509EncodedKeySpec 。

一个简单的例子已经在Java 7 JavaDoc中了（只需用DSA代替DSA）：
http://docs.oracle.com/javase/7/docs/api/java/security/KeyFactory.html

  X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec（bobEncodedPubKey）; 
 KeyFactory keyFactory = KeyFactory.getInstance（RSA）; 
 PublicKey bobPubKey = keyFactory.generatePublic（bobPubKeySpec）; 
  

如果你需要从 byte [] ，我发现你必须使用 PKCS8EncodedKeySpec 。

KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair kp = kpg.genKeyPair();
Key publicKey = kp.getPublic();
Key privateKey = kp.getPrivate();

I want to create just the public key from a byte[].

I have tried this as an experiment:

publicKey = new SecretKeySpec(publicKey.getEncoded(), publicKey.getAlgorithm());

But decryption using that key then fails.

I have also tried serializing the key with ObjectOutputStream, but serialization fails.

java.io.NotSerializableException: org.apache.harmony.xnet.provider.jsse.OpenSSLKey

I read here that I can't use SecretKeySpec with RSA.

so as long as you are talking of a SecretKey and not an RSA or DSA key then you don't have to go through any contortions involving KeyGenerator or the like.

Anyone know how to perform these contortions or a way of doing this.

解决方案

Asymmetric keys like those from RSA are usually stored in X509 format. Therefor you can use X509EncodedKeySpecinstead.

A simple example is already in the Java 7 JavaDoc (just replace DSA with RSA): http://docs.oracle.com/javase/7/docs/api/java/security/KeyFactory.html

X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(bobEncodedPubKey);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey bobPubKey = keyFactory.generatePublic(bobPubKeySpec);

If you need to deserialize the private from byte[], I've found that you must use PKCS8EncodedKeySpec.

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