Java 如何从字符串转换为公钥？
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How to convert from String to PublicKey?
提问by The Coder
I've used the following code to convert the public and private key to a string
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());
Now I'm trying to convert it back to public ad private key
现在我正在尝试将其转换回公共广告私钥
PublicKey publicDecoded = Base64.decodeBase64(publicK);
I'm getting error of cannot convert from byte[] to public key. So I tried like this
我收到无法从 byte[] 转换为公钥的错误。所以我试过这样
PublicKey publicDecoded = new SecretKeySpec(Base64.decodeBase64(publicK),"RSA");
This leads to error like below
这会导致如下错误
java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: Neither a public nor a private key
Looks like I'm doing wrong key conversion here. Any help would be appreciated.
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。
采纳答案by weston
I don't think you can use the SecretKeySpecwith RSA.
我认为您不能将SecretKeySpec与 RSA 一起使用。
This should do:
这应该做：
byte[] publicBytes = Base64.decodeBase64(publicK);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey pubKey = keyFactory.generatePublic(keySpec);
And to decode the private use PKCS8EncodedKeySpec
并解码私人使用 PKCS8EncodedKeySpec
