Openssl Rsa Public And Private Key Generation Using Java
This definitely was useful. In my case I was trying to use my openssh pubkey and had to run this magic first: ssh-keygen -f /.ssh/idrsa.pub -e -m pkcs8 key.pkcs8 - apparently openssh uses a proprietary format for the public key and and the standard pkcs8 format for the private. Sep 09, 2017 A little NodeJS demo of making and verifing JavaScript Web Tokens (JWT) using RSA Public/Private Key Pairs Table of Contents: 00:00 - Introduction 00:44 - 1. /wep-key-generator-iphone-gratis.html. Get a RSA public/private.
Generate a 2048 bit RSA Key. You can generate a public and private RSA key pair like this: openssl genrsa -des3 -out private.pem 2048. That generates a 2048-bit RSA key pair, encrypts them with a password you provide and writes them to a file. You need to next extract the public key file. Private RSA key uses PKCS8EncodedKeySpec Public RSA key uses X509EncodedKeySpec The files generated by ssh-keygen -t rsa -b 1024 need some parsing to remove newline characters as well as inline comments. Further the keys generated are 'bare' PKCS1 formatted whereas Java needs PKCS8 format. I need to replace the encrypt and decrypt step from Unix to java code with the rsaprivatekey.pem and rsapublickey.pem keys generated with openssl. I generate the keys. Openssl genrsa -out /tmp/rsaprivatekey.pem -des3 1024 openssl rsa -in /tmp/rsaprivatekey.pem -pubout -out /tmp/rsapublickey.pem i use the keys in unix (i need do it in java). Generate the CSR code and Private key for your certificate by running this command: openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out servercsr.txt. Note: server.key and servercsr.txt are the Private key and the CSR code files. Feel free to use any file names, as long as you keep the.key and.txt extensions.
| packagetests; |
| importorg.apache.commons.codec.binary.Base64; |
| importjavax.crypto.Cipher; |
| importjava.nio.file.Files; |
| importjava.nio.file.Path; |
| importjava.nio.file.Paths; |
| importjava.security.KeyFactory; |
| importjava.security.PrivateKey; |
| importjava.security.PublicKey; |
| importjava.security.spec.PKCS8EncodedKeySpec; |
| importjava.security.spec.X509EncodedKeySpec; |
| publicclassTest { |
| /** |
| Generate key file using openssl |
| 1、key pair |
| openssl genrsa -out private_key.pem 2048 |
| 2、public key |
| openssl rsa -in private_key.pem -pubout -outform DER -out tst_public.der |
| 3、private key |
| openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key.pem -out private_key.der -nocrypt |
| */ |
| publicstaticvoidmain(String[] args) throwsException { |
| String privateKeyFilePath ='/path/to/private/key/file'; |
| Path privateKeyPath =Paths.get(privateKeyFilePath); |
| byte[] privateKeyBytes =Files.readAllBytes(privateKeyPath); |
| PrivateKey privateKey =KeyFactory.getInstance('RSA').generatePrivate(newPKCS8EncodedKeySpec(privateKeyBytes)); |
| String publicKeyFilePath ='/path/to/public/key/file'; |
| Path publicKeyPath =Paths.get(publicKeyFilePath); |
| byte[] publicKeyBytes =Files.readAllBytes(publicKeyPath); |
| PublicKey publicKey =KeyFactory.getInstance('RSA').generatePublic(newX509EncodedKeySpec(publicKeyBytes)); |
| String str ='abcdefghijklmnopqrstuvwxyz1234567890'; |
| Cipher cipher =Cipher.getInstance('RSA'); |
| cipher.init(Cipher.ENCRYPT_MODE, privateKey); |
| byte[] encStr = cipher.doFinal(str.getBytes()); |
| System.out.println(newString(Base64.encodeBase64(encStr))); |
| Cipher cipher1 =Cipher.getInstance('RSA'); |
| cipher1.init(Cipher.DECRYPT_MODE, publicKey); |
| byte[] decStr = cipher1.doFinal(encStr); |
| System.out.println(newString(decStr)); |
| } |
| } |
Civilization 6 license key generator. For private keys, if your private key is a PKCS#8 structure in DER format, you can read it directly using PKCS8EncodedKeySpec. For example: KeyFactory kf = KeyFactory.getInstance('RSA'); // Read privateKeyDerByteArray from DER file. KeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyDerByteArray); PrivateKey key = kf.generatePrivate(keySpec).
commented Dec 5, 2016
Reference http://stackoverflow.com/questions/17513791/how-to-load-public-ssh-key-from-a-file-in-java |
