115 lines
3.9 KiB
Rust
115 lines
3.9 KiB
Rust
use bech32::{ToBase32, Variant};
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use bip39::{Language, Mnemonic, Seed};
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use rand::rngs::OsRng;
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use rand::RngCore;
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use zcash_client_backend::address::RecipientAddress;
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use zcash_client_backend::encoding::{
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decode_extended_full_viewing_key, decode_extended_spending_key,
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encode_extended_full_viewing_key, encode_extended_spending_key, encode_payment_address,
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};
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use zcash_params::coin::{get_coin_chain, CoinChain, CoinType};
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use zcash_primitives::consensus::Parameters;
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use zcash_primitives::zip32::{ChildIndex, ExtendedFullViewingKey, ExtendedSpendingKey};
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pub struct KeyHelpers {
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coin_type: CoinType,
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}
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impl KeyHelpers {
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pub fn new(coin_type: CoinType) -> Self {
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KeyHelpers { coin_type }
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}
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fn chain(&self) -> &dyn CoinChain {
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get_coin_chain(self.coin_type)
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}
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pub fn decode_key(
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&self,
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key: &str,
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index: u32,
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) -> anyhow::Result<(Option<String>, Option<String>, String, String)> {
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let network = self.chain().network();
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let res = if let Ok(mnemonic) = Mnemonic::from_phrase(key, Language::English) {
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let (sk, ivk, pa) = self.derive_secret_key(&mnemonic, index)?;
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Ok((Some(key.to_string()), Some(sk), ivk, pa))
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} else if let Ok(Some(sk)) =
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decode_extended_spending_key(network.hrp_sapling_extended_spending_key(), key)
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{
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let (ivk, pa) = self.derive_viewing_key(&sk)?;
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Ok((None, Some(key.to_string()), ivk, pa))
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} else if let Ok(Some(fvk)) =
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decode_extended_full_viewing_key(network.hrp_sapling_extended_full_viewing_key(), key)
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{
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let pa = self.derive_address(&fvk)?;
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Ok((None, None, key.to_string(), pa))
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} else {
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Err(anyhow::anyhow!("Not a valid key"))
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};
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res
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}
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pub fn is_valid_key(&self, key: &str) -> i8 {
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let network = self.chain().network();
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if Mnemonic::from_phrase(key, Language::English).is_ok() {
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return 0;
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}
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if let Ok(Some(_)) =
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decode_extended_spending_key(network.hrp_sapling_extended_spending_key(), key)
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{
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return 1;
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}
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if let Ok(Some(_)) =
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decode_extended_full_viewing_key(network.hrp_sapling_extended_full_viewing_key(), key)
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{
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return 2;
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}
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-1
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}
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pub fn derive_secret_key(
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&self,
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mnemonic: &Mnemonic,
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index: u32,
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) -> anyhow::Result<(String, String, String)> {
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let network = self.chain().network();
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let seed = Seed::new(mnemonic, "");
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let master = ExtendedSpendingKey::master(seed.as_bytes());
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let path = [
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ChildIndex::Hardened(32),
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ChildIndex::Hardened(network.coin_type()),
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ChildIndex::Hardened(index),
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];
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let extsk = ExtendedSpendingKey::from_path(&master, &path);
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let sk = encode_extended_spending_key(network.hrp_sapling_extended_spending_key(), &extsk);
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let (fvk, pa) = self.derive_viewing_key(&extsk)?;
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Ok((sk, fvk, pa))
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}
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pub fn derive_viewing_key(
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&self,
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extsk: &ExtendedSpendingKey,
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) -> anyhow::Result<(String, String)> {
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let network = self.chain().network();
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let fvk = ExtendedFullViewingKey::from(extsk);
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let pa = self.derive_address(&fvk)?;
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let fvk =
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encode_extended_full_viewing_key(network.hrp_sapling_extended_full_viewing_key(), &fvk);
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Ok((fvk, pa))
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}
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pub fn derive_address(&self, fvk: &ExtendedFullViewingKey) -> anyhow::Result<String> {
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let network = self.chain().network();
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let (_, payment_address) = fvk.default_address();
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let address =
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encode_payment_address(network.hrp_sapling_payment_address(), &payment_address);
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Ok(address)
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}
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pub fn valid_address(&self, address: &str) -> bool {
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let recipient = RecipientAddress::decode(self.chain().network(), address);
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recipient.is_some()
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}
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}
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