How to convert Byte array to PrivateKey or PublicKey type?

If you have a byte[] representing the output of getEncoded() on a key, you can use KeyFactory to turn that back into a PublicKey object or a PrivateKey object. byte[] privateKeyBytes; byte[] publicKeyBytes; KeyFactory kf = KeyFactory.getInstance(“RSA”); // or “EC” or whatever PrivateKey privateKey = kf.generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes)); PublicKey publicKey = kf.generatePublic(new X509EncodedKeySpec(publicKeyBytes));

X.509: Private / Public Key

The basics command line steps to generate a private and public key using OpenSSL are as follow openssl genrsa -out private.key 1024 openssl req -new -x509 -key private.key -out publickey.cer -days 365 openssl pkcs12 -export -out public_privatekey.pfx -inkey private.key -in publickey.cer Step 1 – generates a private key Step 2 – creates a X509 certificate … Read more

Java: How can I generate PrivateKey from a string?

Your key format is an unencrypted base64-encoded PKCS8-encoded private key. Here is an example of how to decode it into a private key. (Don’t worry about the security of the private key in this example, it is just a throwaway for the example). import java.io.*; import java.security.KeyFactory; import java.security.PrivateKey; import java.security.spec.PKCS8EncodedKeySpec; import android.util.Base64; public class … Read more

How to use public and private key encryption technique in C#

Code example: private static string _privateKey; private static string _publicKey; private static UnicodeEncoding _encoder = new UnicodeEncoding(); private static void RSA() { var rsa = new RSACryptoServiceProvider(); _privateKey = rsa.ToXmlString(true); _publicKey = rsa.ToXmlString(false); var text = “Test1”; Console.WriteLine(“RSA // Text to encrypt: ” + text); var enc = Encrypt(text); Console.WriteLine(“RSA // Encrypted Text: ” + … Read more

Are exported private keys in GPG still encrypted?

Exported secret keys are encrypted by default, however –export-options export-reset-subkey-passwd will produce an unprotected export: When using the –export-secret-subkeys command, this option resets the passphrases for all exported subkeys to empty. This is useful when the exported subkey is to be used on an unattended machine where a passphrase doesn’t necessarily make sense. Defaults to … Read more

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