feat: add ssh agnet(not yet work)

src/sshutil.rs

@@ -0,0 +1,20 @@
+pub fn with_sign(mut vec: Vec<u8>) -> Vec<u8> {
+    if vec.len() > 0 && vec[0] >= 128 {
+        vec.insert(0, 0x00);
+    }
+    vec
+}
+
+pub fn generate_ssh_string(e: &[u8], n: &[u8], comment: &str) -> String {
+    let mut ssh_key = vec![];
+    let ssh_rsa_bytes = "ssh-rsa".as_bytes();
+    ssh_key.extend_from_slice(&(ssh_rsa_bytes.len() as u32).to_be_bytes()[..]);
+    ssh_key.extend_from_slice(ssh_rsa_bytes);
+    let e = with_sign(e.to_vec());
+    ssh_key.extend_from_slice(&(e.len() as u32).to_be_bytes()[..]);
+    ssh_key.extend_from_slice(&e);
+    let n = with_sign(n.to_vec());
+    ssh_key.extend_from_slice(&(n.len() as u32).to_be_bytes()[..]);
+    ssh_key.extend_from_slice(&n);
+    format!("ssh-rsa {} {}", base64::encode(&ssh_key), comment)
+}