From 58c26e1c9d2f69bb0176e3a008829c88ed52cf87 Mon Sep 17 00:00:00 2001
From: Fintan Halpenny <fintan.halpenny@gmail.com>
Date: Wed, 2 Nov 2022 14:29:37 +0000
Subject: [PATCH] radicle-crypto: ExtendedSignature constructor and destructor

Add `ExtendedSignature::new` to construct an `ExtendedSignature`
provided a public key and signature. The `namespace` chosen was
"radicle" and `reserved` is set to be empty -- these choices were
slightly arbitrary.

Also add a desctructor in the form of:
`From<ExtendedSignature> for (PublicKey, Signature)`

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett
---
 radicle-crypto/src/ssh.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/radicle-crypto/src/ssh.rs b/radicle-crypto/src/ssh.rs
index d0d8c778..b051bf3b 100644
--- a/radicle-crypto/src/ssh.rs
+++ b/radicle-crypto/src/ssh.rs
@@ -227,6 +227,12 @@ pub struct ExtendedSignature {
     signature: crypto::Signature,
 }
 
+impl From<ExtendedSignature> for (crypto::PublicKey, crypto::Signature) {
+    fn from(ex: ExtendedSignature) -> Self {
+        (ex.public_key, ex.signature)
+    }
+}
+
 impl Encodable for ExtendedSignature {
     type Error = ExtendedSignatureError;
 
@@ -263,6 +269,17 @@ impl ExtendedSignature {
     const ARMORED_WIDTH: usize = 70;
     const MAGIC_PREAMBLE: &[u8] = b"SSHSIG";
 
+    pub fn new(public_key: crypto::PublicKey, signature: crypto::Signature) -> Self {
+        Self {
+            version: 1,
+            public_key,
+            namespace: b"radicle".to_vec(),
+            reserved: b"".to_vec(),
+            hash_algorithm: b"sha256".to_vec(),
+            signature,
+        }
+    }
+
     pub fn from_armored(s: &[u8]) -> Result<Self, ExtendedSignatureError> {
         let s = s
             .strip_prefix(Self::ARMORED_HEADER)