How encode public key?

[genedna]

I write a generate private key program with pem:

extern crate openssl;
extern crate pem;

use openssl::rsa::Rsa;
use pem::{Pem, encode};

fn main() {
  // Generate a new 4096-bit key.
  let rsa = Rsa::generate(4096).unwrap();

  let public_key = rsa.public_key_to_der().unwrap();
  let private_key = rsa.private_key_to_der().unwrap();

  let private_pem = Pem {
    tag: String::from("RSA PRIVATE KEY"),
    contents: private_key,
  };
  let private = encode(&private_pem);

  println!("{}", private);
}

But I couldn't found a way encode public data to PKIX format, do you have an idea?

Thanks much!

[jcreekmore]

Does https://security.stackexchange.com/questions/115862/what-is-the-format-of-an-rsa-public-key help explain it any? You should be able to just take the public key in DER format and wrap it with RSA PUBLIC KEY, no?

…

On Nov 18, 2017, at 10:24 AM, Quanyi Ma ***@***.***> wrote: I write a generate private key program with pem: extern crate openssl; extern crate pem; use openssl::rsa::Rsa; use pem::{Pem, encode}; fn main() { // Generate a new 4096-bit key. let rsa = Rsa::generate(4096).unwrap(); let public_key = rsa.public_key_to_der().unwrap(); let private_key = rsa.private_key_to_der().unwrap(); let private_pem = Pem { tag: String::from("RSA PRIVATE KEY"), contents: private_key, }; let private = encode(&private_pem); println!("{}", private); } But I couldn't found a way encode public data to PKIX format, do you have an idea? Thanks much! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[cardoe]

To expand a little bit:

  let public_pem = Pem {
    tag: String::from("RSA PUBLIC KEY"),
    contents: public_key,
  };
  let public = encode(&public_pem);

  println!("{}", public);

Should do the trick.

[genedna]

Yeah, I want to use the public key in OpenSSH. The format looks like

ssh-rsa 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 eli@patch.sh

[cardoe]

That’s not PEM format. That’s OpenSSH’s key format. You’ll need a different library.

…

On Nov 18, 2017, at 11:34 PM, Quanyi Ma ***@***.***> wrote: Yeah, I want to use the public key in OpenSSH. The format looks like ssh-rsa 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 ***@***.*** — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

[genedna]

@cardoe I resolved the problem with openssh-key, and I submitted a PR(https://github.com/sdemos/openssh-keys/pull/9) about it. Also, I wrote some demo code in https://github.com/genedna/rust-learning/tree/master/ssh/keygen .