In order to make it work you need to convert key from str to tuple before decryption(ast.literal_eval function). Here is fixed code: import Crypto from Crypto.PublicKey import RSA from Crypto import Random import ast random_generator = Random.new().read key = RSA.generate(1024, random_generator) #generate pub and priv key publickey = key.publickey() # pub key export for exchange … Read more
Using this command I was able to generate the .pem with the contents of the public key. openssl x509 -inform der -in certificate.cer -pubkey -noout > certificate_publickey.pem Which produces: —–BEGIN PUBLIC KEY—– MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCsM+whXrxmbCkPfkwY2EehYpIp *blah blah blah blah* —–END PUBLIC KEY—–
.pem, .cer and .der are all file extensions for files that may contain a X.509 v3 certificate. The .der extension DER is the method of encoding the data that makes up the certificate. DER itself could represent any kind of data, but usually it describes an encoded certificate or a CMS container. CMS is described … Read more
With SSH, there are several different types of keys and RSA keys (the ssh-rsa) kind can support multiple kinds of signatures. The signature type ssh-rsa refers to RSA with SHA-1, whereas the signature type rsa-sha2-256 is RSA with SHA-256 and rsa-sha2-512 is RSA with SHA-512. In the case of Azure DevOps, it only supports the … Read more
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
You are right, the RSA signature size is dependent on the key size, the RSA signature size is equal to the length of the modulus in bytes. This means that for a “n bit key”, the resulting signature will be exactly n bits long. Although the computed signature value is not necessarily n bits, the … Read more
You can create an RSACryptoServiceProvider from a PEM file using the following class (GetRSAProviderFromPemFile method). Warning: Don’t just copy code from StackOverflow without verification! Especially not crypto code! This code has bugs (see comments). You may want to write and run tests before using this in production (if you really have no better option). I … Read more
Code for the above answer public static PublicKey getKey(String key){ try{ byte[] byteKey = Base64.decode(key.getBytes(), Base64.DEFAULT); X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey); KeyFactory kf = KeyFactory.getInstance(“RSA”); return kf.generatePublic(X509publicKey); } catch(Exception e){ e.printStackTrace(); } return null; }
First off, apologies, this answer got rather long. If you use RSA to sign your tokens, and a connecting client is a web browser, the client will never see the RSA keys (public or private). This is because the client presumably doesn’t need to verify that the JWT is valid, only the server needs to … Read more
RSA can only encrypt data blocks that are shorter than the key length so what you normally do is Generate a random key of the correct length required for AES (or similar). Encrypt your data using AES or similar using that key Encrypt the random key using your RSA key Then you publish both the … Read more