如何转换String至PublicKey？

Question

我使用以下代码将公钥和私钥转换为字符串

KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
keyPairGen.initialize(2048);
KeyPair          keyPair    = keyPairGen.genKeyPair();
PublicKey        publicKey  = keyPair.getPublic();
PrivateKey       privateKey = keyPair.getPrivate();
String publicK = Base64.encodeBase64String(publicKey.getEncoded());
String privateK = Base64.encodeBase64String(privateKey.getEncoded());

现在我正在尝试将其转换回公共广告私钥

PublicKey publicDecoded = Base64.decodeBase64(publicK);

我收到错误,无法从byte []转换为公钥.所以我试过这样的

PublicKey publicDecoded = new SecretKeySpec(Base64.decodeBase64(publicK),"RSA");

这会导致如下错误

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: Neither a public nor a private key

看起来我在这里做了错误的密钥转换.任何帮助,将不胜感激.

Answer 1

我不认为你可以使用SecretKeySpecRSA.

这应该做:

byte[] publicBytes = Base64.decodeBase64(publicK);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey pubKey = keyFactory.generatePublic(keySpec);

并解码私人使用 PKCS8EncodedKeySpec