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i am trying to read private key from a file using the below code and getting an exception. is there any way to resolve it? generatePrivate() method throws invalidkeyspecexception.

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;

(...)
try {
             
    Path path = Paths.get(THE_BINARY_ENCODED_FILE_PATH);
    byte[] privKeyByteArray = Files.readAllBytes(path);
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privKeyByteArray);
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    PrivateKey privateKey= keyFactory.generatePrivate(keySpec);
    
} catch (Exception e) {
    e.printStackTrace();
}

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how to solvethis?

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  • 1
    look in the documentation what causes that Exception to be thrown Commented Dec 4, 2024 at 10:47
  • 1
    You can't share the file you're reading for obvious reasons, so please check whether the first answer here (the last part, in particular) helps. Commented Dec 4, 2024 at 10:50
  • 1
    When java tells you: "This key file is invalid" then.. the key file is invalid. We can't help you; ordinarily we'd say: Share the key file, we'll have a look, but, you obviously wouldn't want to share this. Can you repeat the process that made this key, make a new one, and post that? Commented Dec 4, 2024 at 11:09
  • 1
    PKCS8EncodedKeySpec() requires a DER encoded key in PKCS#8 format. Check if this applies to your key. Commented Dec 4, 2024 at 11:18
  • 1
    If I were to take a wild guess, I'd guess your private key is in PEM format rather than binary DER. That won't work. Commented Dec 4, 2024 at 14:17

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My key was invalid. tried with different file and it worked!

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