Noratrieb/cluelessh
1
0
Fork 0
mirror of https://github.com/Noratrieb/cluelessh.git synced 2026-01-14 16:35:06 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

stuff

Browse source
This commit is contained in:
nora 2024-08-28 00:11:12 +02:00
parent bb55a1c334
commit 46f77b7f58
5 changed files with 177 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

45
lib/cluelessh-keys/src/signature.rs
View file

@ -1,4 +1,4 @@
use cluelessh_format::Writer;
use cluelessh_format::{ParseError, Reader, Writer};
use crate::{private::PrivateKey, public::PublicKey};
@ -24,6 +24,49 @@ pub enum Signature {
}
impl Signature {
pub fn from_wire_encoding(data: &[u8]) -> Result<Self, ParseError> {
let mut sig = Reader::new(data);
let algorithm_name = sig.utf8_string()?;
let signature = match algorithm_name {
"ssh-ed25519" => {
// <https://datatracker.ietf.org/doc/html/rfc8709#name-signature-format>
let signature = sig
.string()?
.try_into()
.map_err(|_| ParseError(format!("invalid signature length")))?;
Self::Ed25519 {
signature: ed25519_dalek::Signature::from_bytes(&signature),
}
}
"ecdsa-sha2-nistp256" => {
// <https://datatracker.ietf.org/doc/html/rfc5656#section-3.1.2>
let r: [u8; 32] = sig
.mpint()?
.try_into()
.map_err(|_| ParseError(format!("invalid r scaler byte length")))?;
let s: [u8; 32] = sig
.mpint()?
.try_into()
.map_err(|_| ParseError(format!("invalid s scaler byte length")))?;
// TODO: fix stupid length
let signature = p256::ecdsa::Signature::from_scalars(r, s)
.map_err(|_| ParseError(format!("invalid signature")))?;
Self::EcdsaSha2NistP256 { signature }
}
_ => {
return Err(ParseError(format!(
"unsupported signature algorithm: {algorithm_name}"
)))
}
};
Ok(signature)
}
pub fn to_wire_encoding(&self) -> Vec<u8> {
let mut data = Writer::new();
data.string(self.algorithm_name());