mirror of https://github.com/zcash/zip32.git
ExtendedSpendingKey::write() and ExtendedFullViewingKey::write()
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parent
3b31854de7
commit
e47cafd691
32
src/lib.rs
32
src/lib.rs
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@ -9,13 +9,14 @@ extern crate sapling_crypto;
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use aes::Aes256;
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use aes::Aes256;
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use blake2_rfc::blake2b::{Blake2b, Blake2bResult};
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use blake2_rfc::blake2b::{Blake2b, Blake2bResult};
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use byteorder::{ByteOrder, LittleEndian};
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use byteorder::{ByteOrder, LittleEndian, WriteBytesExt};
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use fpe::ff1::{BinaryNumeralString, FF1};
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use fpe::ff1::{BinaryNumeralString, FF1};
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use pairing::{bls12_381::Bls12, Field, PrimeField, PrimeFieldRepr};
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use pairing::{bls12_381::Bls12, Field, PrimeField, PrimeFieldRepr};
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use sapling_crypto::{
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use sapling_crypto::{
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jubjub::{FixedGenerators, JubjubBls12, JubjubEngine, JubjubParams, ToUniform},
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jubjub::{FixedGenerators, JubjubBls12, JubjubEngine, JubjubParams, ToUniform},
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primitives::{Diversifier, PaymentAddress, ViewingKey},
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primitives::{Diversifier, PaymentAddress, ViewingKey},
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};
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};
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use std::io::{self, Write};
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lazy_static! {
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lazy_static! {
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static ref JUBJUB: JubjubBls12 = { JubjubBls12::new() };
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static ref JUBJUB: JubjubBls12 = { JubjubBls12::new() };
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@ -206,6 +207,13 @@ impl ChildIndex {
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fn master() -> Self {
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fn master() -> Self {
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ChildIndex::from_index(0)
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ChildIndex::from_index(0)
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}
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}
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fn to_index(&self) -> u32 {
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match self {
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&ChildIndex::Hardened(i) => i + (1 << 31),
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&ChildIndex::NonHardened(i) => i,
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}
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}
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}
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}
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/// A chain code
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/// A chain code
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@ -365,6 +373,17 @@ impl ExtendedSpendingKey {
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}
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}
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}
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}
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pub fn write<W: Write>(&self, mut writer: W) -> io::Result<()> {
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writer.write_u8(self.depth)?;
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writer.write_all(&self.parent_fvk_tag.0)?;
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writer.write_u32::<LittleEndian>(self.child_index.to_index())?;
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writer.write_all(&self.chain_code.0)?;
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writer.write_all(&self.xsk.to_bytes())?;
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writer.write_all(&self.dk.0)?;
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Ok(())
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}
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/// Returns the child key corresponding to the path derived from the master key
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/// Returns the child key corresponding to the path derived from the master key
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pub fn from_path(master: &ExtendedSpendingKey, path: &[ChildIndex]) -> Self {
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pub fn from_path(master: &ExtendedSpendingKey, path: &[ChildIndex]) -> Self {
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let mut xsk = master.clone();
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let mut xsk = master.clone();
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@ -427,6 +446,17 @@ impl<'a> From<&'a ExtendedSpendingKey> for ExtendedFullViewingKey {
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}
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}
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impl ExtendedFullViewingKey {
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impl ExtendedFullViewingKey {
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pub fn write<W: Write>(&self, mut writer: W) -> io::Result<()> {
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writer.write_u8(self.depth)?;
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writer.write_all(&self.parent_fvk_tag.0)?;
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writer.write_u32::<LittleEndian>(self.child_index.to_index())?;
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writer.write_all(&self.chain_code.0)?;
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writer.write_all(&self.fvk.to_bytes())?;
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writer.write_all(&self.dk.0)?;
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Ok(())
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}
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pub fn derive_child(&self, i: ChildIndex) -> Result<Self, ()> {
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pub fn derive_child(&self, i: ChildIndex) -> Result<Self, ()> {
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let tmp = match i {
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let tmp = match i {
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ChildIndex::Hardened(_) => return Err(()),
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ChildIndex::Hardened(_) => return Err(()),
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