emerald-vault-core 0.26.6

Ethereum secure account management core libary
Documentation 
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/*
Copyright 2019 ETCDEV GmbH

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
//! # APDU for communication with Ledger HD wallet over HID
//! For more details about protocol refer to
//! [APDU](https://github.com/LedgerHQ/blue-app-eth/blob/master/doc/ethapp.asc)

use std::fmt;

pub const APDU_HEADER_SIZE: usize = 0x05;

///
#[repr(packed)]
pub struct APDU {
    pub cla: u8,
    pub ins: u8,
    pub p1: u8,
    pub p2: u8,
    pub len: u8,
    pub data: Vec<u8>,
}

impl fmt::Debug for APDU {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let d = vec![].clone_from(&self.data);
        write!(
            f,
            "APDU {{ cla: {}, ins: {}, p1: {}, p2: {}, len: {}, data: {:?} }}",
            self.cla, self.ins, self.p1, self.p2, self.len, d
        )
    }
}

impl Clone for APDU {
    fn clone(&self) -> APDU {
        APDU {
            cla: self.cla,
            ins: self.ins,
            p1: self.p1,
            p2: self.p2,
            len: self.len,
            data: self.data.clone(),
        }
    }
}

impl Default for APDU {
    fn default() -> Self {
        APDU {
            cla: 0xe0,
            ins: 0x00,
            p1: 0x00,
            p2: 0x00,
            len: 0x00,
            data: Vec::new(),
        }
    }
}

impl APDU {
    /// Get APDU's packed header
    pub fn raw_header(&self) -> Vec<u8> {
        let mut buf = Vec::with_capacity(APDU_HEADER_SIZE);
        buf.push(self.cla);
        buf.push(self.ins);
        buf.push(self.p1);
        buf.push(self.p2);
        buf.push(self.len);
        buf
    }

    pub fn len(&self) -> usize {
        let len = self.data.len();
        len + APDU_HEADER_SIZE
    }
}

/// Builder for Ledger APDU
pub struct ApduBuilder {
    apdu: APDU,
}

#[allow(dead_code)]
impl ApduBuilder {
    ///  Create new Builder
    pub fn new(cmd: u8) -> Self {
        let mut apdu = APDU::default();
        apdu.ins = cmd;

        Self { apdu }
    }

    /// Add parameter 1
    pub fn with_p1(&mut self, p1: u8) -> &mut Self {
        self.apdu.p1 = p1;
        self
    }

    /// Add parameter 2
    pub fn with_p2(&mut self, p2: u8) -> &mut Self {
        self.apdu.p2 = p2;
        self
    }

    /// Add data
    pub fn with_data(&mut self, data: &[u8]) -> &mut Self {
        self.apdu.data.extend_from_slice(data);
        self.apdu.len += data.len() as u8;
        self
    }

    /// Create APDU
    pub fn build(&self) -> APDU {
        self.apdu.clone()
    }
}