add function to compute ed25519 pubkey

Author: chcmedeiros

bolos-impl/Cargo.toml

@@ -11,7 +11,7 @@ edition = "2018"
 bolos-common = { version = "0.1", path = "../bolos-common" }
 bolos-sys = { version = "0.1", path = "../bolos-sys" }
 zemu-sys = { version = "0.1", path = "../zemu" }
-
+ed25519-dalek = { version = "2.1.1", default-features = false }
 cfg-if = "1.0.0"
 no-std-compat = { version = "0.4" }
 

bolos-impl/src/crypto/ecfp256.rs

@@ -143,6 +143,25 @@ impl AsRef<[u8]> for PublicKey {
     }
 }
 
+pub fn public_from_bytes_ed25519(
+    bytes: &[u8; 32],
+    out: &mut MaybeUninit<PublicKey>,
+) -> Result<(), Error> {
+    use ed25519_dalek::{SigningKey, VerifyingKey};
+
+    // Initialize the PublicKey struct with the appropriate data
+    unsafe {
+        let out_ptr = out.as_mut_ptr();
+        (*out_ptr).0.W[0] = 0x02; // Add prefix for compressed format
+        (*out_ptr).0.W[1..33]
+            .copy_from_slice(&SigningKey::from_bytes(bytes).verifying_key().to_bytes());
+        (*out_ptr).0.W_len = 33; // Length includes the prefix byte
+        (*out_ptr).0.curve = Curve::Ed25519 as u32;
+    }
+
+    Ok(())
+}
+
 pub struct SecretKey<const B: usize> {
     mode: Mode,
     curve: Curve,

bolos-mock/src/crypto/ecfp256.rs

@@ -118,7 +118,6 @@ impl<const B: usize> SecretKey<B> {
         _: Mode,
         curve: Curve,
         path: BIP32Path<B>,
-        ed25519_secret_key_bytes: Option<[u8; 32]>,
     ) -> Self {
         let bytes = match curve {
             Curve::Secp256K1 => {
@@ -132,17 +131,11 @@ impl<const B: usize> SecretKey<B> {
                 *secret.to_bytes().as_ref()
             }
             Curve::Ed25519 => {
-                if let Some(bytes) = ed25519_secret_key_bytes {
-                    let secret = ed25519_dalek::SigningKey::from_bytes(&bytes);
-                    secret.to_bytes()
-                } else {
-                    // Generate random bytes using the path if no bytes provided
-                    let mut bytes = [0u8; 32];
-                    let mut rng = Self::rng8(path);
-                    use rand_chacha8::rand_core::RngCore;
-                    rng.fill_bytes(&mut bytes);
-                    bytes
-                }
+                let mut bytes = [0u8; 32];
+                let mut rng = Self::rng8(path);
+                use rand_chacha8::rand_core::RngCore;
+                rng.fill_bytes(&mut bytes);
+                bytes
             }
             Curve::Stark256 => {
                 panic!("invalid curve passed to ecfp256 new")