Implement sign payload for ledger

Author: elizabethengelman

cmd/soroban-cli/src/signer/ledger.rs

@@ -22,6 +22,7 @@ pub enum Error {
 mod ledger_impl {
     use super::Error;
     use crate::xdr::{DecoratedSignature, Hash, Signature, SignatureHint, Transaction};
+    use ed25519_dalek::Signature as Ed25519Signature;
     use sha2::{Digest, Sha256};
     use stellar_ledger::{Blob as _, Exchange, LedgerSigner};
 
@@ -96,6 +97,12 @@ mod ledger_impl {
             Ok(DecoratedSignature { hint, signature })
         }
 
+        pub async fn sign_payload(&self, payload: [u8; 32]) -> Result<Ed25519Signature, Error> {
+            let signed_bytes = self.signer.sign_blob(&self.index.into(), &payload).await?;
+            let sig = Ed25519Signature::from_bytes(signed_bytes.as_slice().try_into()?);
+            Ok(sig)
+        }
+
         pub async fn public_key(&self) -> Result<stellar_strkey::ed25519::PublicKey, Error> {
             Ok(self.signer.get_public_key(&self.index.into()).await?)
         }

cmd/soroban-cli/src/signer/mod.rs

@@ -287,7 +287,10 @@ impl Signer {
                 let p = <[u8; 32]>::try_from(payload)?;
                 local_key.sign_payload(p)
             }
-            SignerKind::Ledger(_ledger) => todo!("ledger"),
+            SignerKind::Ledger(ledger) => Ok({
+                let p = <[u8; 32]>::try_from(payload)?;
+                ledger.sign_payload(p).await?
+            }),
             SignerKind::Lab => Err(Error::ReturningSignatureFromLab),
             SignerKind::SecureStore(secure_store_entry) => {
                 let p = <[u8; 32]>::try_from(payload)?;