Support retrieving MASP keys.

rs/src/lib.rs

@@ -32,15 +32,16 @@ pub use ledger_zondax_generic::LedgerAppError;
 mod params;
 use params::SALT_LEN;
 pub use params::{
-    InstructionCode, ADDRESS_LEN, CLA, ED25519_PUBKEY_LEN, PK_LEN_PLUS_TAG, SIG_LEN_PLUS_TAG,
+    InstructionCode, ADDRESS_LEN, CLA, ED25519_PUBKEY_LEN, KEY_LENGTH, PK_LEN_PLUS_TAG, SIG_LEN_PLUS_TAG,
 };
-use utils::{ResponseAddress, ResponseSignature};
+use utils::{P1Values, ResponseAddress, ResponseSignature};
 
 use std::convert::TryInto;
 use std::str;
 
 mod utils;
 pub use utils::BIP44Path;
+pub use utils::{KeyResponse, NamadaKeys};
 
 /// Ledger App Error
 #[derive(Debug, thiserror::Error)]
@@ -137,11 +138,11 @@ where
         let (_public_key, rest) = rest.split_at((*public_key_len).into());
         let (address_len, rest) = rest.split_first().expect("response too short");
         let (address_bytes, rest) = rest.split_at((*address_len).into());
-        if rest.len() > 0 {
+        if !rest.is_empty() {
             panic!("response too long");
         }
 
-        let address_str = str::from_utf8(&address_bytes)
+        let address_str = str::from_utf8(address_bytes)
             .map_err(|_| LedgerAppError::Utf8)?
             .to_owned();
 
@@ -152,6 +153,91 @@ where
         })
     }
 
+    /// Retrieves the public key and address
+    pub async fn retrieve_keys(
+        &self,
+        path: &BIP44Path,
+        key_type: NamadaKeys,
+        show_in_device: bool,
+    ) -> Result<KeyResponse, NamError<E::Error>> {
+        let serialized_path = path.serialize_path().unwrap();
+        let p1: u8 = if show_in_device {
+            P1Values::ShowAddressInDevice
+        } else {
+            P1Values::OnlyRetrieve
+        } as _;
+        let command = APDUCommand {
+            cla: CLA,
+            ins: InstructionCode::GetKeys as _,
+            p1,
+            p2: key_type as _,
+            data: serialized_path,
+        };
+
+        let response = self
+            .apdu_transport
+            .exchange(&command)
+            .await
+            .map_err(LedgerAppError::TransportError)?;
+
+        match response.error_code() {
+            Ok(APDUErrorCode::NoError) => {}
+            Ok(err) => {
+                return Err(NamError::Ledger(LedgerAppError::AppSpecific(
+                    err as _,
+                    err.description(),
+                )))
+            }
+            Err(err) => {
+                return Err(NamError::Ledger(LedgerAppError::AppSpecific(
+                    err,
+                    "[APDU_ERROR] Unknown".to_string(),
+                )))
+            }
+        }
+
+        let response_data = response.data();
+
+        match key_type {
+            NamadaKeys::PublicAddress => {
+                let (public_address, rest) = response_data.split_at(KEY_LENGTH);
+                if !rest.is_empty() {
+                    panic!("response too long");
+                }
+
+                Ok(KeyResponse::Address {
+                    public_address: public_address.try_into().unwrap(),
+                })
+            },
+            NamadaKeys::ViewKey => {
+                let (view_key, rest) = response_data.split_at(2*KEY_LENGTH);
+                let (ovk, rest) = rest.split_at(KEY_LENGTH);
+                let (ivk, rest) = rest.split_at(KEY_LENGTH);
+                if !rest.is_empty() {
+                    panic!("response too long");
+                }
+
+                Ok(KeyResponse::ViewKey {
+                    view_key: view_key.try_into().unwrap(),
+                    ovk: ovk.try_into().unwrap(),
+                    ivk: ivk.try_into().unwrap(),
+                })
+            },
+            NamadaKeys::ProofGenerationKey => {
+                let (ak, rest) = response_data.split_at(KEY_LENGTH);
+                let (nsk, rest) = rest.split_at(KEY_LENGTH);
+                if !rest.is_empty() {
+                    panic!("response too long");
+                }
+
+                Ok(KeyResponse::ProofGenKey {
+                    ak: ak.try_into().unwrap(),
+                    nsk: nsk.try_into().unwrap(),
+                })
+            },
+        }
+    }
+
     /// Sign wrapper transaction
     pub async fn sign(
         &self,
@@ -232,7 +318,7 @@ where
 
         hasher.update([0x01]);
 
-        hasher.update(&[pubkeys.len() as u8, 0, 0, 0]);
+        hasher.update([pubkeys.len() as u8, 0, 0, 0]);
         for pubkey in pubkeys {
             hasher.update(pubkey);
         }
@@ -260,7 +346,7 @@ where
     ) -> bool {
         use ed25519_dalek::{Signature, VerifyingKey};
 
-        if pubkey != &signature.pubkey {
+        if pubkey != signature.pubkey {
             return false;
         }
 

rs/src/params.rs

@@ -33,15 +33,26 @@ pub const SIG_LEN_PLUS_TAG: usize = ED25519_SIGNATURE_LEN + 1;
 /// Salt Length
 pub const SALT_LEN: usize = 8;
 /// Hash Length
-// pub const HASH_LEN: usize = 32;
+pub const KEY_LENGTH: usize = 32;
 /// Available instructions to interact with the Ledger device
 #[repr(u8)]
 pub enum InstructionCode {
+    /// Instruction to get app version
+    GetVersion = 0,
     /// Instruction to retrieve Pubkey and Address
     GetAddressAndPubkey = 1,
     /// Instruction to sign a transaction
     Sign = 2,
-
-    /// Instruction to retrieve a signed section
-    GetSignature = 0x0a,
+    /// Instruction to get keys
+    GetKeys = 3,
+    /// Instruction to get spend randomness
+    GetSpendRand = 4,
+    /// Instruction to get output randomness
+    GetOutputRand = 5,
+    /// Instruction to get convert randomness
+    GetConvertRand = 6,
+    /// Instruction to sign MASP transaction
+    SignMasp = 7,
+    /// Instruction to extract spend signature
+    ExtractSpendSign = 8,
 }

rs/src/utils.rs

@@ -21,7 +21,7 @@ use std::error::Error;
 
 const HARDENED: u32 = 0x80000000;
 
-use crate::params::{ADDRESS_LEN, ED25519_PUBKEY_LEN, PK_LEN_PLUS_TAG, SALT_LEN, SIG_LEN_PLUS_TAG};
+use crate::params::{ADDRESS_LEN, ED25519_PUBKEY_LEN, KEY_LENGTH, PK_LEN_PLUS_TAG, SALT_LEN, SIG_LEN_PLUS_TAG};
 use byteorder::{LittleEndian, WriteBytesExt};
 
 pub struct ResponseAddress {
@@ -54,7 +54,7 @@ impl BIP44Path {
     pub fn serialize_path(&self) -> Result<Vec<u8>, Box<dyn Error>> {
         if !self.path.starts_with('m') {
             return Err(
-                format!("Path should start with \"m\" (e.g \"m/44'/5757'/5'/0/3\")").into(),
+                "Path should start with \"m\" (e.g \"m/44'/5757'/5'/0/3\")".to_string().into(),
             );
         }
 
@@ -69,10 +69,9 @@ impl BIP44Path {
             .write_u8((path_array.len() - 1) as u8)
             .unwrap();
 
-        for i in 1..path_array.len() {
+        for mut child in path_array.iter().skip(1).copied() {
             let mut value = 0;
-            let mut child = path_array[i];
-            if child.ends_with("'") {
+            if child.ends_with('\'') {
                 value += HARDENED;
                 child = &child[..child.len() - 1];
             }
@@ -90,6 +89,51 @@ impl BIP44Path {
     }
 }
 
+/// Kinds of keys that can be requested in get keys instruction
+#[derive(Copy, Clone)]
+pub enum NamadaKeys {
+    /// Public address request
+    PublicAddress = 0x00,
+    /// Viewing key request
+    ViewKey = 0x01,
+    /// Proof generation key request
+    ProofGenerationKey = 0x02,
+}
+
+/// Kinds of data retrieval
+pub enum P1Values {
+    /// Request data without displaying it
+    OnlyRetrieve = 0x00,
+    /// Retrieve data whilst showing on screen
+    ShowAddressInDevice = 0x01,
+}
+
+/// Response to the get keys instruction
+pub enum KeyResponse {
+    /// Address response
+    Address {
+        /// Public address
+        public_address: [u8; KEY_LENGTH],
+    },
+    /// Viewing key responsee
+    ViewKey {
+        /// Viewing key
+        view_key: [u8; KEY_LENGTH*2],
+        /// Incoming viewing key
+        ivk: [u8; KEY_LENGTH],
+        /// Outgoing viewing key
+        ovk: [u8; KEY_LENGTH],
+    },
+    /// Proof generation key response
+    ProofGenKey {
+        /// Spend authorization address key
+        ak: [u8; KEY_LENGTH],
+        /// Nullifier private key
+        nsk: [u8; KEY_LENGTH],
+    },
+}
+
+
 #[cfg(test)]
 mod tests {
     use super::BIP44Path;