Bogdan-Ștefan Neacșu
85 lines
2.4 KiB
Rust
85 lines
2.4 KiB
Rust
// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
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// SPDX-License-Identifier: Apache-2.0
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pub mod addr_secp265k1;
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pub mod error;
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pub(crate) mod helpers;
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pub mod version;
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use crate::addr_secp265k1::AddrSecp265k1Response;
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use crate::helpers::path_bytes;
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use crate::version::VersionResponse;
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use bip32::DerivationPath;
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use error::Result;
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use ledger_transport::APDUCommand;
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use ledger_transport_hid::hidapi::HidApi;
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use ledger_transport_hid::TransportNativeHID;
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const CLA: u8 = 0x55;
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const INS_GET_VERSION: u8 = 0x00;
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const _INS_SIGN_SECP256K1: u8 = 0x02;
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const INS_GET_ADDR_SECP256K1: u8 = 0x04;
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/// Manage hardware Ledger device with Cosmos specific operations, as described in the
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/// specification: https://github.com/cosmos/ledger-cosmos/blob/main/docs/APDUSPEC.md
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pub struct CosmosLedger {
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transport: TransportNativeHID,
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}
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impl CosmosLedger {
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/// Create the connection to the first Ledger device that we can find.
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pub fn new() -> Result<Self> {
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let api = HidApi::new()?;
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let transport = TransportNativeHID::new(&api)?;
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Ok(CosmosLedger { transport })
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}
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/// Get the version of the device.
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pub fn get_version(&self) -> Result<VersionResponse> {
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let command = APDUCommand {
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cla: CLA,
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ins: INS_GET_VERSION,
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p1: 0,
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p2: 0,
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data: vec![],
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};
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let response = self.transport.exchange(&command)?;
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VersionResponse::try_from(response)
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}
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/// Get the SECP265K1 address of the device.
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pub fn get_addr_secp265k1(
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&self,
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path: DerivationPath,
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prefix: &str,
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display: bool,
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) -> Result<AddrSecp265k1Response> {
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let display = if display { 1 } else { 0 };
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let components = path_bytes(path)?;
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let data: Vec<u8> = vec![
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[prefix.len() as u8].as_slice(),
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prefix.as_bytes(),
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components[0].as_slice(),
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components[1].as_slice(),
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components[2].as_slice(),
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components[3].as_slice(),
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components[4].as_slice(),
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]
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.into_iter()
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.flatten()
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.copied()
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.collect();
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let command = APDUCommand {
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cla: CLA,
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ins: INS_GET_ADDR_SECP256K1,
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p1: display,
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p2: 0,
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data,
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};
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let response = self.transport.exchange(&command)?;
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AddrSecp265k1Response::try_from(response)
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}
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}
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