public-key - w3toppers.com

How to sign string with private key

I guess what you say is you know the key pair before hand and want to sign/verify with that. Please see the following code. import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.Signature; import sun.misc.BASE64Encoder; public class MainClass { public static void main(String[] args) throws Exception { KeyPair keyPair = getKeyPair(); byte[] data = “test”.getBytes(“UTF8”); Signature … Read more

Setting up OpenSSH for Windows using public key authentication

Following are setup steps for OpenSSH shipped with Windows 10 v.1803 (April 2018 update. See comments to this post, it might not work with 1809). Server setup (elevated powershell): Install OpenSSH server: Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0. Start agent and sshd services: Start-Service ssh-agent; Start-Service sshd (this will generate host keys and default configuration automatically in … Read more

JSch SFTP security with session.setConfig(“StrictHostKeyChecking”, “no”);

Disabling the StrictHostKeyChecking option will make the connection less secure than having the option enabled, because it will let you connect to remote servers without verifying their SSH host keys. If the option is enabled, you will only be able to connect to servers which keys are known to your SSH client. You will have … Read more

How to create a X509 certificate using Java?

For JDK versions <17, you can also generate a certificate using only JDK classes. The disadvantage is that you have to use two classes from the sun.security.x509 package. The code would be: KeyStore keyStore = … // your keystore // generate the certificate // first parameter = Algorithm // second parameter = signrature algorithm // … Read more

How can I get SecKeyRef from DER/PEM file

I struggled a lot with the same problem and finally found a solution. My problem was that I needed to use both an external private and public key for encrypting/decrypting data in an iOS app and didn’t want to use the keychain. It turns out you also need a signed certificate for the iOS security … Read more

git push: permission denied (public key)

I was facing same problem and here is what I did that worked for me. Use ssh instead of http. Remove origin if its http. git remote rm origin Add ssh url git remote add origin [email protected]:<username>/<repo>.git Generate ssh key inside .ssh/ folder. It will ask for path and passphrase where you can just press … Read more

Getting the PublicKeyToken of .Net assemblies [duplicate]

Open a command prompt and type one of the following lines according to your Visual Studio version and Operating System Architecture : VS 2008 on 32bit Windows : “%ProgramFiles%\Microsoft SDKs\Windows\v6.0A\bin\sn.exe” -T <assemblyname> VS 2008 on 64bit Windows : “%ProgramFiles(x86)%\Microsoft SDKs\Windows\v6.0A\bin\sn.exe” -T <assemblyname> VS 2010 on 32bit Windows : “%ProgramFiles%\Microsoft SDKs\Windows\v7.0A\bin\sn.exe” -T <assemblyname> VS 2010 on … Read more

Encrypt in Javascript, decrypt in PHP, using public-key cryptography

I’ve used something similar for my login page; it encrypts login credentials using the given public key information (N, e) which can be decrypted in PHP. It uses the following files that are part of JSBN: jsbn.js – to work with big integers rsa.js – for RSA encryption only (uses jsbn.js) rng.js – basic entropy … Read more

RSA: Get exponent and modulus given a public key

It depends on the tools you can use. I doubt there is a JavaScript too that could do it directly within the browser. It also depends if it’s a one-off (always the same key) or whether you need to script it. Command-line / OpenSSL If you want to use something like OpenSSL on a unix … Read more

Adding a public key to ~/.ssh/authorized_keys does not log me in automatically

You need to verify the permissions of the authorized_keys file and the folder / parent folders in which it is located. chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys For more information see this page. You may also need to change/verify the permissions of your home directory to remove write access for the group and others. chmod … Read more