How to convert from String to PublicKey?

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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());

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

PublicKey publicDecoded = Base64.decodeBase64(publicK);

I'm getting error of cannot convert from public key to private key. So I used tried like this

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

This leads to error like below

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.

asked 1 min ago

user1354678

77

How to convert from String to PublicKey?