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Merge pull request #352 from str4d/zcash_address 

New component: zcash_address crate
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str4d 2021-06-07 00:36:48 +01:00 committed by GitHub
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1
Cargo.toml
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[workspace]
members = [
"components/equihash",
"components/zcash_address",
"components/zcash_note_encryption",
"zcash_client_backend",
"zcash_client_sqlite",

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components/zcash_address/Cargo.toml Normal file
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[package]
name = "zcash_address"
description = "Zcash address parsing and serialization"
version = "0.0.0"
authors = [
"Jack Grigg <jack@electriccoin.co>",
]
homepage = "https://github.com/zcash/librustzcash"
repository = "https://github.com/zcash/librustzcash"
readme = "README.md"
license = "MIT OR Apache-2.0"
edition = "2018"
[dependencies]
bech32 = "0.8"
blake2b_simd = "0.5"
bs58 = { version = "0.4", features = ["check"] }
[dev-dependencies]
proptest = "0.10.1"

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components/zcash_address/LICENSE-APACHE Normal file
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components/zcash_address/LICENSE-MIT Normal file
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The MIT License (MIT)
Copyright (c) 2021 Electric Coin Company
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components/zcash_address/README.md Normal file
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# zcash_address
Zcash address parsing and serialization. This library allows its users to easily
recognize and give good error messages for new Zcash address types.
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.

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components/zcash_address/proptest-regressions/kind/unified.txt Normal file
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# Seeds for failure cases proptest has generated in the past. It is
# automatically read and these particular cases re-run before any
# novel cases are generated.
#
# It is recommended to check this file in to source control so that
# everyone who runs the test benefits from these saved cases.
cc e08469bc301313ef868b97a5c37d9a9746d9720c915a9127c89db25c3be778fd # shrinks to ua = Address([Sapling([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), P2pkh([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])])

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components/zcash_address/src/convert.rs Normal file
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use std::{error::Error, fmt};
use crate::{kind::*, AddressKind, Network, ZcashAddress};
/// An address type is not supported for conversion.
#[derive(Debug)]
pub struct UnsupportedAddress(&'static str);
impl fmt::Display for UnsupportedAddress {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Zcash {} addresses are not supported", self.0)
}
}
impl Error for UnsupportedAddress {}
/// A helper trait for converting a [`ZcashAddress`] into another type.
///
/// [`ZcashAddress`]: crate::ZcashAddress
///
/// # Examples
///
/// ```
/// use zcash_address::{FromAddress, Network, UnsupportedAddress, ZcashAddress};
///
/// #[derive(Debug)]
/// struct MySapling([u8; 43]);
///
/// // Implement the FromAddress trait, overriding whichever conversion methods match your
/// // requirements for the resulting type.
/// impl FromAddress for MySapling {
/// fn from_sapling(net: Network, data: [u8; 43]) -> Result<Self, UnsupportedAddress> {
/// Ok(MySapling(data))
/// }
/// }
///
/// // For a supported address type, the conversion works.
/// let addr: ZcashAddress =
/// "zs1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqpq6d8g"
/// .parse()
/// .unwrap();
/// assert!(addr.convert::<MySapling>().is_ok());
///
/// // For an unsupported address type, we get an error.
/// let addr: ZcashAddress = "t1Hsc1LR8yKnbbe3twRp88p6vFfC5t7DLbs".parse().unwrap();
/// assert_eq!(
/// addr.convert::<MySapling>().unwrap_err().to_string(),
/// "Zcash transparent P2PKH addresses are not supported",
/// );
/// ```
pub trait FromAddress: Sized {
fn from_sprout(net: Network, data: sprout::Data) -> Result<Self, UnsupportedAddress> {
let _ = (net, data);
Err(UnsupportedAddress("Sprout"))
}
fn from_sapling(net: Network, data: sapling::Data) -> Result<Self, UnsupportedAddress> {
let _ = (net, data);
Err(UnsupportedAddress("Sapling"))
}
fn from_unified(net: Network, data: unified::Address) -> Result<Self, UnsupportedAddress> {
let _ = (net, data);
Err(UnsupportedAddress("Unified"))
}
fn from_transparent_p2pkh(net: Network, data: p2pkh::Data) -> Result<Self, UnsupportedAddress> {
let _ = (net, data);
Err(UnsupportedAddress("transparent P2PKH"))
}
fn from_transparent_p2sh(net: Network, data: p2sh::Data) -> Result<Self, UnsupportedAddress> {
let _ = (net, data);
Err(UnsupportedAddress("transparent P2SH"))
}
}
/// A helper trait for converting another type into a [`ZcashAddress`].
///
/// This trait is sealed and cannot be implemented for types outside this crate. Its
/// purpose is to move these conversion functions out of the main `ZcashAddress` API
/// documentation, as they are only required when creating addresses (rather than when
/// parsing addresses, which is a more common occurrence).
///
/// [`ZcashAddress`]: crate::ZcashAddress
///
/// # Examples
///
/// ```
/// use zcash_address::{ToAddress, Network, ZcashAddress};
///
/// #[derive(Debug)]
/// struct MySapling([u8; 43]);
///
/// impl MySapling {
/// /// Encodes this Sapling address for the given network.
/// fn encode(&self, net: Network) -> ZcashAddress {
/// ZcashAddress::from_sapling(net, self.0)
/// }
/// }
///
/// let addr = MySapling([0; 43]);
/// let encoded = addr.encode(Network::Main);
/// assert_eq!(
/// encoded.to_string(),
/// "zs1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqpq6d8g",
/// );
/// ```
pub trait ToAddress: private::Sealed {
fn from_sprout(net: Network, data: sprout::Data) -> Self;
fn from_sapling(net: Network, data: sapling::Data) -> Self;
fn from_unified(net: Network, data: unified::Address) -> Self;
fn from_transparent_p2pkh(net: Network, data: p2pkh::Data) -> Self;
fn from_transparent_p2sh(net: Network, data: p2sh::Data) -> Self;
}
impl ToAddress for ZcashAddress {
fn from_sprout(net: Network, data: sprout::Data) -> Self {
ZcashAddress {
net: if let Network::Regtest = net {
Network::Test
} else {
net
},
kind: AddressKind::Sprout(data),
}
}
fn from_sapling(net: Network, data: sapling::Data) -> Self {
ZcashAddress {
net,
kind: AddressKind::Sapling(data),
}
}
fn from_unified(net: Network, data: unified::Address) -> Self {
ZcashAddress {
net,
kind: AddressKind::Unified(data),
}
}
fn from_transparent_p2pkh(net: Network, data: p2pkh::Data) -> Self {
ZcashAddress {
net: if let Network::Regtest = net {
Network::Test
} else {
net
},
kind: AddressKind::P2pkh(data),
}
}
fn from_transparent_p2sh(net: Network, data: p2sh::Data) -> Self {
ZcashAddress {
net: if let Network::Regtest = net {
Network::Test
} else {
net
},
kind: AddressKind::P2sh(data),
}
}
}
mod private {
use crate::ZcashAddress;
pub trait Sealed {}
impl Sealed for ZcashAddress {}
}

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use std::{convert::TryInto, error::Error, fmt, str::FromStr};
use bech32::{self, FromBase32, ToBase32, Variant};
use crate::{kind::*, AddressKind, Network, ZcashAddress};
/// An error while attempting to parse a string as a Zcash address.
#[derive(Debug, PartialEq)]
pub enum ParseError {
/// The string is an invalid encoding.
InvalidEncoding,
/// The string is not a Zcash address.
NotZcash,
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ParseError::InvalidEncoding => write!(f, "Invalid encoding"),
ParseError::NotZcash => write!(f, "Not a Zcash address"),
}
}
}
impl Error for ParseError {}
impl FromStr for ZcashAddress {
type Err = ParseError;
/// Attempts to parse the given string as a Zcash address.
fn from_str(s: &str) -> Result<Self, Self::Err> {
// Remove leading and trailing whitespace, to handle copy-paste errors.
let s = s.trim();
// Most Zcash addresses use Bech32 or Bech32m, so try those first.
match bech32::decode(s) {
Ok((hrp, data, Variant::Bech32m)) => {
// If we reached this point, the encoding is supposed to be valid Bech32m.
let data =
Vec::<u8>::from_base32(&data).map_err(|_| ParseError::InvalidEncoding)?;
let net = match hrp.as_str() {
unified::MAINNET => Network::Main,
unified::TESTNET => Network::Test,
unified::REGTEST => Network::Regtest,
// We will not define new Bech32m address encodings.
_ => {
return Err(ParseError::NotZcash);
}
};
return data[..]
.try_into()
.map(AddressKind::Unified)
.map_err(|_| ParseError::InvalidEncoding)
.map(|kind| ZcashAddress { net, kind });
}
Ok((hrp, data, Variant::Bech32)) => {
// If we reached this point, the encoding is supposed to be valid Bech32.
let data =
Vec::<u8>::from_base32(&data).map_err(|_| ParseError::InvalidEncoding)?;
let net = match hrp.as_str() {
sapling::MAINNET => Network::Main,
sapling::TESTNET => Network::Test,
sapling::REGTEST => Network::Regtest,
// We will not define new Bech32 address encodings.
_ => {
return Err(ParseError::NotZcash);
}
};
return data[..]
.try_into()
.map(AddressKind::Sapling)
.map_err(|_| ParseError::InvalidEncoding)
.map(|kind| ZcashAddress { net, kind });
}
Err(_) => (),
}
// The rest use Base58Check.
if let Ok(decoded) = bs58::decode(s).with_check(None).into_vec() {
let net = match decoded[..2].try_into().unwrap() {
sprout::MAINNET | p2pkh::MAINNET | p2sh::MAINNET => Network::Main,
sprout::TESTNET | p2pkh::TESTNET | p2sh::TESTNET => Network::Test,
// We will not define new Base58Check address encodings.
_ => return Err(ParseError::NotZcash),
};
return match decoded[..2].try_into().unwrap() {
sprout::MAINNET | sprout::TESTNET => {
decoded[2..].try_into().map(AddressKind::Sprout)
}
p2pkh::MAINNET | p2pkh::TESTNET => decoded[2..].try_into().map(AddressKind::P2pkh),
p2sh::MAINNET | p2sh::TESTNET => decoded[2..].try_into().map(AddressKind::P2sh),
_ => unreachable!(),
}
.map_err(|_| ParseError::InvalidEncoding)
.map(|kind| ZcashAddress { kind, net });
};
// If it's not valid Bech32 or Base58Check, it's not a Zcash address.
Err(ParseError::NotZcash)
}
}
fn encode_bech32m(hrp: &str, data: &[u8]) -> String {
bech32::encode(hrp, data.to_base32(), Variant::Bech32m).expect("hrp is invalid")
}
fn encode_bech32(hrp: &str, data: &[u8]) -> String {
bech32::encode(hrp, data.to_base32(), Variant::Bech32).expect("hrp is invalid")
}
fn encode_b58(prefix: [u8; 2], data: &[u8]) -> String {
let mut bytes = Vec::with_capacity(2 + data.len());
bytes.extend_from_slice(&prefix);
bytes.extend_from_slice(data);
bs58::encode(bytes).with_check().into_string()
}
impl fmt::Display for ZcashAddress {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let encoded = match &self.kind {
AddressKind::Sprout(data) => encode_b58(
match self.net {
Network::Main => sprout::MAINNET,
Network::Test | Network::Regtest => sprout::TESTNET,
},
data,
),
AddressKind::Sapling(data) => encode_bech32(
match self.net {
Network::Main => sapling::MAINNET,
Network::Test => sapling::TESTNET,
Network::Regtest => sapling::REGTEST,
},
data,
),
AddressKind::Unified(data) => encode_bech32m(
match self.net {
Network::Main => unified::MAINNET,
Network::Test => unified::TESTNET,
Network::Regtest => unified::REGTEST,
},
&data.to_bytes(),
),
AddressKind::P2pkh(data) => encode_b58(
match self.net {
Network::Main => p2pkh::MAINNET,
Network::Test | Network::Regtest => p2pkh::TESTNET,
},
data,
),
AddressKind::P2sh(data) => encode_b58(
match self.net {
Network::Main => p2sh::MAINNET,
Network::Test | Network::Regtest => p2sh::TESTNET,
},
data,
),
};
write!(f, "{}", encoded)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::kind::unified;
fn encoding(encoded: &str, decoded: ZcashAddress) {
assert_eq!(decoded.to_string(), encoded);
assert_eq!(encoded.parse(), Ok(decoded));
}
#[test]
fn sprout() {
encoding(
"zc8E5gYid86n4bo2Usdq1cpr7PpfoJGzttwBHEEgGhGkLUg7SPPVFNB2AkRFXZ7usfphup5426dt1buMmY3fkYeRrQGLa8y",
ZcashAddress { net: Network::Main, kind: AddressKind::Sprout([0; 64]) },
);
encoding(
"ztJ1EWLKcGwF2S4NA17pAJVdco8Sdkz4AQPxt1cLTEfNuyNswJJc2BbBqYrsRZsp31xbVZwhF7c7a2L9jsF3p3ZwRWpqqyS",
ZcashAddress { net: Network::Test, kind: AddressKind::Sprout([0; 64]) },
);
}
#[test]
fn sapling() {
encoding(
"zs1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqpq6d8g",
ZcashAddress {
net: Network::Main,
kind: AddressKind::Sapling([0; 43]),
},
);
encoding(
"ztestsapling1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqfhgwqu",
ZcashAddress {
net: Network::Test,
kind: AddressKind::Sapling([0; 43]),
},
);
encoding(
"zregtestsapling1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqknpr3m",
ZcashAddress {
net: Network::Regtest,
kind: AddressKind::Sapling([0; 43]),
},
);
}
#[test]
fn unified() {
encoding(
"u1cd8yzk5mdn4n9r8c24tp8j8e9ethw3rr7ker5zhew3kycyyxggdzfkcq5f9yf2jv8m5ar8krncsntlfpx3p4azvwrkp8z74t3vu4kqq2",
ZcashAddress {
net: Network::Main,
kind: AddressKind::Unified(unified::Address(vec![unified::Receiver::Sapling([0; 43])])),
},
);
encoding(
"utest1cd8yzk5mdn4n9r8c24tp8j8e9ethw3rr7ker5zhew3kycyyxggdzfkcq5f9yf2jv8m5ar8krncsntlfpx3p4azvwrkp8z74t3vptphj8",
ZcashAddress {
net: Network::Test,
kind: AddressKind::Unified(unified::Address(vec![unified::Receiver::Sapling([0; 43])])),
},
);
encoding(
"uregtest1cd8yzk5mdn4n9r8c24tp8j8e9ethw3rr7ker5zhew3kycyyxggdzfkcq5f9yf2jv8m5ar8krncsntlfpx3p4azvwrkp8z74t3vsnt5j0",
ZcashAddress {
net: Network::Regtest,
kind: AddressKind::Unified(unified::Address(vec![unified::Receiver::Sapling([0; 43])])),
},
);
}
#[test]
fn transparent() {
encoding(
"t1Hsc1LR8yKnbbe3twRp88p6vFfC5t7DLbs",
ZcashAddress {
net: Network::Main,
kind: AddressKind::P2pkh([0; 20]),
},
);
encoding(
"tm9iMLAuYMzJ6jtFLcA7rzUmfreGuKvr7Ma",
ZcashAddress {
net: Network::Test,
kind: AddressKind::P2pkh([0; 20]),
},
);
encoding(
"t3JZcvsuaXE6ygokL4XUiZSTrQBUoPYFnXJ",
ZcashAddress {
net: Network::Main,
kind: AddressKind::P2sh([0; 20]),
},
);
encoding(
"t26YoyZ1iPgiMEWL4zGUm74eVWfhyDMXzY2",
ZcashAddress {
net: Network::Test,
kind: AddressKind::P2sh([0; 20]),
},
);
}
#[test]
fn whitespace() {
assert_eq!(
" t1Hsc1LR8yKnbbe3twRp88p6vFfC5t7DLbs".parse(),
Ok(ZcashAddress {
net: Network::Main,
kind: AddressKind::P2pkh([0; 20])
}),
);
assert_eq!(
"t1Hsc1LR8yKnbbe3twRp88p6vFfC5t7DLbs ".parse(),
Ok(ZcashAddress {
net: Network::Main,
kind: AddressKind::P2pkh([0; 20])
}),
);
assert_eq!(
"something t1Hsc1LR8yKnbbe3twRp88p6vFfC5t7DLbs".parse::<ZcashAddress>(),
Err(ParseError::NotZcash),
);
}
}

7
components/zcash_address/src/kind.rs Normal file
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@ -0,0 +1,7 @@
pub mod unified;
pub(crate) mod sapling;
pub(crate) mod sprout;
pub(crate) mod p2pkh;
pub(crate) mod p2sh;

7
components/zcash_address/src/kind/p2pkh.rs Normal file
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@ -0,0 +1,7 @@
/// The prefix for a Base58Check-encoded mainnet transparent P2PKH address.
pub(crate) const MAINNET: [u8; 2] = [0x1c, 0xb8];
/// The prefix for a Base58Check-encoded testnet transparent P2PKH address.
pub(crate) const TESTNET: [u8; 2] = [0x1d, 0x25];
pub(crate) type Data = [u8; 20];

7
components/zcash_address/src/kind/p2sh.rs Normal file
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@ -0,0 +1,7 @@
/// The prefix for a Base58Check-encoded mainnet transparent P2SH address.
pub(crate) const MAINNET: [u8; 2] = [0x1c, 0xbd];
/// The prefix for a Base58Check-encoded testnet transparent P2SH address.
pub(crate) const TESTNET: [u8; 2] = [0x1c, 0xba];
pub(crate) type Data = [u8; 20];

22
components/zcash_address/src/kind/sapling.rs Normal file
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@ -0,0 +1,22 @@
/// The HRP for a Bech32-encoded mainnet Sapling address.
///
/// Defined in the [Zcash Protocol Specification section 5.6.4][saplingpaymentaddrencoding].
///
/// [saplingpaymentaddrencoding]: https://zips.z.cash/protocol/protocol.pdf#saplingpaymentaddrencoding
pub(crate) const MAINNET: &str = "zs";
/// The HRP for a Bech32-encoded testnet Sapling address.
///
/// Defined in the [Zcash Protocol Specification section 5.6.4][saplingpaymentaddrencoding].
///
/// [saplingpaymentaddrencoding]: https://zips.z.cash/protocol/protocol.pdf#saplingpaymentaddrencoding
pub(crate) const TESTNET: &str = "ztestsapling";
/// The HRP for a Bech32-encoded regtest Sapling address.
///
/// It is defined in [the `zcashd` codebase].
///
/// [the `zcashd` codebase]: https://github.com/zcash/zcash/blob/128d863fb8be39ee294fda397c1ce3ba3b889cb2/src/chainparams.cpp#L493
pub(crate) const REGTEST: &str = "zregtestsapling";
pub(crate) type Data = [u8; 43];

15
components/zcash_address/src/kind/sprout.rs Normal file
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@ -0,0 +1,15 @@
/// The prefix for a Base58Check-encoded mainnet Sprout address.
///
/// Defined in the [Zcash Protocol Specification section 5.6.3][sproutpaymentaddrencoding].
///
/// [sproutpaymentaddrencoding]: https://zips.z.cash/protocol/protocol.pdf#sproutpaymentaddrencoding
pub(crate) const MAINNET: [u8; 2] = [0x16, 0x9a];
/// The prefix for a Base58Check-encoded testnet Sprout address.
///
/// Defined in the [Zcash Protocol Specification section 5.6.3][].
///
/// []: https://zips.z.cash/protocol/protocol.pdf#sproutpaymentaddrencoding
pub(crate) const TESTNET: [u8; 2] = [0x16, 0xb6];
pub(crate) type Data = [u8; 64];

196
components/zcash_address/src/kind/unified.rs Normal file
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@ -0,0 +1,196 @@
use std::convert::{TryFrom, TryInto};
use std::iter;
use crate::{kind, ParseError};
mod f4jumble;
/// The HRP for a Bech32m-encoded mainnet Unified Address.
///
/// Defined in [ZIP 316][zip-0316].
///
/// [zip-0316]: https://zips.z.cash/zip-0316
pub(crate) const MAINNET: &str = "u";
/// The HRP for a Bech32m-encoded testnet Unified Address.
///
/// Defined in [ZIP 316][zip-0316].
///
/// [zip-0316]: https://zips.z.cash/zip-0316
pub(crate) const TESTNET: &str = "utest";
/// The HRP for a Bech32m-encoded regtest Unified Address.
pub(crate) const REGTEST: &str = "uregtest";
const PADDING_LEN: usize = 16;
/// The set of known Receivers for Unified Addresses.
///
/// This enum is an internal-only type, and is maintained in preference order, so that the
/// derived [`PartialOrd`] will sort receivers correctly. From its documentation:
///
/// > When derived on enums, variants are ordered by their top-to-bottom discriminant
/// > order.
#[derive(Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub(crate) enum Receiver {
Orchard([u8; 43]),
Sapling(kind::sapling::Data),
P2pkh(kind::p2pkh::Data),
P2sh(kind::p2sh::Data),
Unknown { typecode: u8, data: Vec<u8> },
}
impl TryFrom<(u8, &[u8])> for Receiver {
type Error = ParseError;
fn try_from((typecode, addr): (u8, &[u8])) -> Result<Self, Self::Error> {
match typecode {
0x00 => addr.try_into().map(Receiver::P2pkh),
0x01 => addr.try_into().map(Receiver::P2sh),
0x02 => addr.try_into().map(Receiver::Sapling),
0x03 => addr.try_into().map(Receiver::Orchard),
_ => Ok(Receiver::Unknown {
typecode,
data: addr.to_vec(),
}),
}
.map_err(|_| ParseError::InvalidEncoding)
}
}
impl Receiver {
fn typecode(&self) -> u8 {
match self {
Receiver::P2pkh(_) => 0x00,
Receiver::P2sh(_) => 0x01,
Receiver::Sapling(_) => 0x02,
Receiver::Orchard(_) => 0x03,
Receiver::Unknown { typecode, .. } => *typecode,
}
}
fn addr(&self) -> &[u8] {
match self {
Receiver::P2pkh(data) => data,
Receiver::P2sh(data) => data,
Receiver::Sapling(data) => data,
Receiver::Orchard(data) => data,
Receiver::Unknown { data, .. } => data,
}
}
}
/// A Unified Address.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Address(pub(crate) Vec<Receiver>);
impl TryFrom<&[u8]> for Address {
type Error = ParseError;
fn try_from(buf: &[u8]) -> Result<Self, Self::Error> {
let encoded = f4jumble::f4jumble_inv(buf).ok_or(ParseError::InvalidEncoding)?;
// Validate and strip trailing zero bytes.
let encoded = match encoded.split_at(encoded.len() - PADDING_LEN) {
(encoded, tail) if tail == &[0; PADDING_LEN][..] => Ok(encoded),
_ => Err(ParseError::InvalidEncoding),
}?;
iter::repeat(())
.scan(encoded, |encoded, _| match encoded {
// Base case: we've parsed the full encoding.
[] => None,
// The raw encoding of a Unified Address is a concatenation of:
// - typecode: byte
// - length: byte
// - addr: byte[length]
[typecode, length, data @ ..] if data.len() >= *length as usize => {
let (addr, rest) = data.split_at(*length as usize);
*encoded = rest;
Some(Receiver::try_from((*typecode, addr)))
}
// The encoding is truncated.
_ => Some(Err(ParseError::InvalidEncoding)),
})
.collect::<Result<_, _>>()
.map(Address)
}
}
impl Address {
/// Returns the raw encoding of this Unified Address.
pub(crate) fn to_bytes(&self) -> Vec<u8> {
let encoded: Vec<_> = self
.0
.iter()
.flat_map(|receiver| {
let addr = receiver.addr();
// Holds by construction.
assert!(addr.len() < 256);
iter::empty()
.chain(Some(receiver.typecode()))
.chain(Some(addr.len() as u8))
.chain(addr.iter().cloned())
})
.chain(iter::repeat(0).take(PADDING_LEN))
.collect();
f4jumble::f4jumble(&encoded).unwrap()
}
}
#[cfg(test)]
mod tests {
use std::convert::TryFrom;
use proptest::{
array::{uniform11, uniform20, uniform32},
prelude::*,
};
use super::{Address, Receiver};
prop_compose! {
fn uniform43()(a in uniform11(0u8..), b in uniform32(0u8..)) -> [u8; 43] {
let mut c = [0; 43];
c[..11].copy_from_slice(&a);
c[11..].copy_from_slice(&b);
c
}
}
fn arb_shielded_receiver() -> BoxedStrategy<Receiver> {
prop_oneof![
uniform43().prop_map(Receiver::Sapling),
uniform43().prop_map(Receiver::Orchard),
]
.boxed()
}
fn arb_transparent_receiver() -> BoxedStrategy<Receiver> {
prop_oneof![
uniform20(0u8..).prop_map(Receiver::P2pkh),
uniform20(0u8..).prop_map(Receiver::P2sh),
]
.boxed()
}
prop_compose! {
fn arb_unified_address()(
shielded in prop::collection::hash_set(arb_shielded_receiver(), 1..2),
transparent in prop::option::of(arb_transparent_receiver()),
) -> Address {
Address(shielded.into_iter().chain(transparent).collect())
}
}
proptest! {
#[test]
fn ua_roundtrip(ua in arb_unified_address()) {
let bytes = ua.to_bytes();
let decoded = Address::try_from(&bytes[..]);
prop_assert_eq!(decoded, Ok(ua));
}
}
}

0
zcash_primitives/src/address/f4jumble.rs → components/zcash_address/src/kind/unified/f4jumble.rs
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0
zcash_primitives/src/address/f4jumble/test_vectors.rs → components/zcash_address/src/kind/unified/f4jumble/test_vectors.rs
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90
components/zcash_address/src/lib.rs Normal file
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@ -0,0 +1,90 @@
mod convert;
mod encoding;
mod kind;
pub use convert::{FromAddress, ToAddress, UnsupportedAddress};
pub use encoding::ParseError;
pub use kind::unified;
/// A Zcash address.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct ZcashAddress {
net: Network,
kind: AddressKind,
}
/// The Zcash network for which an address is encoded.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum Network {
/// Zcash Mainnet.
Main,
/// Zcash Testnet.
Test,
/// Private integration / regression testing, used in `zcashd`.
///
/// For some address types there is no distinction between test and regtest encodings;
/// those will always be parsed as `Network::Test`.
Regtest,
}
/// Known kinds of Zcash addresses.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
enum AddressKind {
Sprout(kind::sprout::Data),
Sapling(kind::sapling::Data),
Unified(unified::Address),
P2pkh(kind::p2pkh::Data),
P2sh(kind::p2sh::Data),
}
impl ZcashAddress {
/// Attempts to parse the given string as a Zcash address.
///
/// This simply calls [`s.parse()`], leveraging the [`FromStr` implementation].
///
/// [`s.parse()`]: std::primitive::str::parse
/// [`FromStr` implementation]: ZcashAddress#impl-FromStr
///
/// # Errors
///
/// - If the parser can detect that the string _must_ contain an address encoding used
/// by Zcash, [`ParseError::InvalidEncoding`] will be returned if any subsequent
/// part of that encoding is invalid.
///
/// - In all other cases, [`ParseError::NotZcash`] will be returned on failure.
///
/// # Examples
///
/// ```
/// use zcash_address::ZcashAddress;
///
/// let encoded = "zs1z7rejlpsa98s2rrrfkwmaxu53e4ue0ulcrw0h4x5g8jl04tak0d3mm47vdtahatqrlkngh9sly";
/// let addr = ZcashAddress::try_from_encoded(&encoded);
/// assert_eq!(encoded.parse(), addr);
/// ```
pub fn try_from_encoded(s: &str) -> Result<Self, ParseError> {
s.parse()
}
/// Converts this address into another type.
///
/// `convert` can convert into any type that implements the [`FromAddress`] trait.
/// This enables `ZcashAddress` to be used as a common parsing and serialization
/// interface for Zcash addresses, while delegating operations on those addresses
/// (such as constructing transactions) to downstream crates.
///
/// If you want to get the encoded string for this address, use the [`Display`]
/// implementation instead via [`address.to_string()`].
///
/// [`Display`]: std::fmt::Display
/// [`address.to_string()`]: std::string::ToString
pub fn convert<T: FromAddress>(self) -> Result<T, UnsupportedAddress> {
match self.kind {
AddressKind::Sprout(data) => T::from_sprout(self.net, data),
AddressKind::Sapling(data) => T::from_sapling(self.net, data),
AddressKind::Unified(data) => T::from_unified(self.net, data),
AddressKind::P2pkh(data) => T::from_transparent_p2pkh(self.net, data),
AddressKind::P2sh(data) => T::from_transparent_p2sh(self.net, data),
}
}
}

2
zcash_primitives/src/address.rs
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@ -1,2 +0,0 @@
/// Types and algorithms used in support of Zcash Unified Addresses
pub mod f4jumble;

1
zcash_primitives/src/lib.rs
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@ -9,7 +9,6 @@
// Temporary until we have addressed all Result<T, ()> cases.
#![allow(clippy::result_unit_err)]
pub mod address;
pub mod block;
pub mod consensus;
pub mod constants;