如何从 String 转换为 PublicKey?

2022-01-10 00:00:00 encryption cryptography public-key-encryption java

我使用以下代码将公钥和私钥转换为字符串

I've used the following code to convert the public and private key to a string

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

Now I'm trying to convert it back to public ad private key

PublicKey publicDecoded = Base64.decodeBase64(publicK);

我收到无法从 byte[] 转换为公钥的错误.所以我就这样尝试了

I'm getting error of cannot convert from byte[] to public key. So I tried like this

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

看起来我在这里进行了错误的密钥转换.任何帮助将不胜感激.

Looks like I'm doing wrong key conversion here. Any help would be appreciated.

推荐答案

我认为你不能将 SecretKeySpec 与 RSA 一起使用.

I don't think you can use the SecretKeySpec with RSA.

应该这样做:

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

并解码私用PKCS8EncodedKeySpec

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