85 lines
2.5 KiB
Rust
85 lines
2.5 KiB
Rust
use std::convert::TryInto;
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use gumdrop::Options;
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use zcash_client_backend::encoding::{decode_extended_full_viewing_key, encode_payment_address};
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use zcash_primitives::{
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constants::{mainnet, testnet},
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zip32::{DiversifierIndex, ExtendedFullViewingKey},
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};
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fn parse_viewing_key(s: &str) -> Result<(ExtendedFullViewingKey, bool), &'static str> {
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decode_extended_full_viewing_key(mainnet::HRP_SAPLING_EXTENDED_FULL_VIEWING_KEY, s)
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.ok()
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.flatten()
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.map(|vk| (vk, true))
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.or_else(|| {
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decode_extended_full_viewing_key(testnet::HRP_SAPLING_EXTENDED_FULL_VIEWING_KEY, s)
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.ok()
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.flatten()
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.map(|vk| (vk, false))
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})
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.ok_or("Invalid Sapling viewing key")
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}
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fn parse_diversifier_index(s: &str) -> Result<DiversifierIndex, &'static str> {
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let i: u128 = s.parse().map_err(|_| "Diversifier index is not a number")?;
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if i >= (1 << 88) {
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return Err("Diversifier index too large");
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}
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Ok(DiversifierIndex(i.to_le_bytes()[..11].try_into().unwrap()))
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}
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fn encode_diversifier_index(di: &DiversifierIndex) -> u128 {
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let mut bytes = [0; 16];
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bytes[..11].copy_from_slice(&di.0);
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u128::from_le_bytes(bytes)
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}
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#[derive(Debug, Options)]
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struct MyOptions {
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#[options(help = "Print this help message and exit.")]
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help: bool,
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#[options(
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free,
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help = "The Sapling viewing key to generate diversified addresses from",
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parse(try_from_str = "parse_viewing_key")
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)]
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viewing_key: Option<(ExtendedFullViewingKey, bool)>,
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#[options(
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free,
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help = "The index of the diversified address to generate (default 0). Some indices don't have a corresponding address.",
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parse(try_from_str = "parse_diversifier_index")
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)]
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diversifier_index: DiversifierIndex,
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}
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fn main() {
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let opts = MyOptions::parse_args_default_or_exit();
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let (extfvk, is_mainnet) = if let Some(res) = opts.viewing_key {
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res
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} else {
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eprintln!("Missing Sapling viewing key");
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return;
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};
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let (diversifier_index, address) = extfvk.find_address(opts.diversifier_index).unwrap();
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println!(
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"# Diversifier index: {}",
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encode_diversifier_index(&diversifier_index)
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);
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println!(
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"{}",
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encode_payment_address(
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if is_mainnet {
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mainnet::HRP_SAPLING_PAYMENT_ADDRESS
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} else {
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testnet::HRP_SAPLING_PAYMENT_ADDRESS
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},
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&address
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)
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);
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}
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