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chore: checkpoint before Python removal

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{"files":{".cargo_vcs_info.json":"29818ae227fce683276a4e069e2eca656a6d23371505f04207155120df6ebddd","CHANGELOG.md":"2449de0a06c0b7cc8befcca6d8401ac054e96556f06c0b4dfd1e9048f92813f6","Cargo.toml":"9a0ed264f832101d9e2e786db0e22d90a2a2544ed19c760ec7f2d501d950a9dd","Cargo.toml.orig":"cb69cef9cac35599f182cf0fe35f31e2061addf3aa978d648c7bb8f23dcf631e","LICENSE-APACHE":"a9040321c3712d8fd0b09cf52b17445de04a23a10165049ae187cd39e5c86be5","LICENSE-MIT":"b3470648aff02beb36d7a53240fc9260ed80ed93bd43bace6b67d7ef7336ee33","README.md":"abe06adcdfc61ddd24c4a1007b6da73a9c83acf9f2cad76bcb394cdb9341ba5a","src/encoding.rs":"872ae940d329d523335d1e28379de898f25ccf98c3366a6773a6728a9e0e1992","src/error.rs":"26b85a7b2671363cd92faad5d3cc511797df2792d79f29c4373535516e91b247","src/hazmat.rs":"c662aeb812a9ce24d0e2c7dedeca7d9ae7002bd527cbd484557b04a41bab1817","src/keypair.rs":"9b2f6cda46e3fe8c29b571b912745f4dfb7c6a1186c56790f0e3fd080ab3bdf7","src/lib.rs":"9ad89b20efad0859a136f4dbee92f643e345afb3c5235a31d5b2ec72556b3b76","src/prehash_signature.rs":"74b7641cfcf5692625adec58b550ac3a12125983e12076c4e811be7f28462a0c","src/signer.rs":"20a50c3c2fc0ef678e1ca87aca9c75527794bd66cf52583aa941b13b3f1ee1da","src/verifier.rs":"4eaeb33529879b3bbfc13442a5823905ca05f8f27316192360f9bbd416822976","tests/derive.rs":"980390b69a0d0bcbbab26e086727bc91ada0fad21c38bb961a0a143260eb8375"},"package":"77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"}

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{
"git": {
"sha1": "5adcd4819b380b4aaec2b57c6bf3f2239a109060"
},
"path_in_vcs": "signature"
}

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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## 2.2.0 (2023-11-12)
### Changed
- MSRV 1.60 ([#1387])
### Fixed
- No longer vendoring async/derive crates unintentionally ([#1391])
[#1387]: https://github.com/RustCrypto/traits/pull/1387
[#1391]: https://github.com/RustCrypto/traits/pull/1391
## 2.1.0 (2023-04-01)
### Added
- `SignatureEncoding::encoded_len` ([#1283])
[#1283]: https://github.com/RustCrypto/traits/pull/1283
## 2.0.0 (2023-01-15)
### Added
- `SignatureEncoding` trait as a replacement for `Signature` trait and the
now removed `AsRef<[u8]>` bound on signatures ([#1141])
- New `Keypair` trait which returns owned keys instead of borrowed ([#1141])
### Changed
- `derive-preview` has been renamed to `derive` and stabilized ([#1141])
- `digest-preview` renamed to `digest`, still unstable ([#1210])
- `hazmat-preview` feature stabilized and removed, always on ([#1141])
- `rand-preview` renamed to `rand_core`, still unstable ([#1210])
- `std` feature is no longer enabled by default ([#1141])
- Old `Keypair` trait renamed to `KeypairRef` ([#1141])
- Signature generic parameter removed from `Keypair`/`KeypairRef` ([#1141])
- Use `&mut impl CryptoRngCore` RNG arguments ([#1147])
### Removed
- `Signature` trait - replaced by `SignatureEncoding` ([#1141])
- `hazmat-preview` feature, now always on ([#1141])
[#1141]: https://github.com/RustCrypto/traits/pull/1141
[#1147]: https://github.com/RustCrypto/traits/pull/1147
[#1210]: https://github.com/RustCrypto/traits/pull/1141
## 1.6.4 (2022-10-06)
### Added
- `RandomizedPrehashSigner` trait in `hazmat` module ([#1130])
[#1130]: https://github.com/RustCrypto/traits/pull/1130
## 1.6.3 (2022-09-16)
### Changed
- Bump `signature_derive` to v1.0.0-pre.7 ([#1119])
[#1119]: https://github.com/RustCrypto/traits/pull/1119
## 1.6.2 (2022-09-15)
### Changed
- Relax `Keypair` type bounds ([#1107])
[#1107]: https://github.com/RustCrypto/traits/pull/1107
## 1.6.1 (2022-09-12) [YANKED]
### Added
- `hazmat-preview` feature with `PrehashSigner`/`PrehashVerifier` traits ([#1099])
### Changed
- Bump `signature_derive` to v1.0.0-pre.6 ([#1104])
[#1099]: https://github.com/RustCrypto/traits/pull/1099
[#1104]: https://github.com/RustCrypto/traits/pull/1104
## 1.6.0 (2022-08-14) [YANKED]
### Added
- `Keypair` trait ([#1080])
### Changed
- Rust 2021 edition upgrade; MSRV 1.56 ([#1081])
- Bump `signature_derive` dependency to v1.0.0-pre.5 ([#1082])
- Bump `hex-literal` dependency to v0.3 ([#1083])
[#1080]: https://github.com/RustCrypto/traits/pull/1080
[#1081]: https://github.com/RustCrypto/traits/pull/1081
[#1082]: https://github.com/RustCrypto/traits/pull/1082
[#1083]: https://github.com/RustCrypto/traits/pull/1083
## 1.5.0 (2022-01-04)
### Changed
- Bump `digest` dependency to v0.10 ([#850])
- Bump `signature-derive` dependency to v1.0.0-pre.4 ([#866])
[#850]: https://github.com/RustCrypto/traits/pull/850
[#866]: https://github.com/RustCrypto/traits/pull/866
## 1.4.0 (2021-10-20)
### Added
- Re-export `rand_core` when the `rand-preview` feature is enabled ([#683])
- `SignerMut` trait ([#734])
### Fixed
- Show error source in `Display` impl ([#791])
[#683]: https://github.com/RustCrypto/traits/pull/683
[#734]: https://github.com/RustCrypto/traits/pull/734
[#791]: https://github.com/RustCrypto/traits/pull/791
## 1.3.2 (2021-10-21)
### Fixed
- Backport changes from [#791] to the 1.3.x series.
## 1.3.1 (2021-06-29)
### Added
- `Result` alias ([#676])
[#676]: https://github.com/RustCrypto/traits/pull/676
## 1.3.0 (2021-01-06)
### Changed
- Bump `rand_core` to v0.6 ([#457])
- Bump `signature-derive` v1.0.0-pre.3 ([#459])
[#457]: https://github.com/RustCrypto/traits/pull/457
[#459]: https://github.com/RustCrypto/traits/pull/459
## 1.2.2 (2020-07-29)
### Added
- `RandomizedDigestSigner` ([#235])
[#235]: https://github.com/RustCrypto/traits/pull/235
## 1.2.1 (2020-07-29)
### Removed
- RNG generic parameter `R` from `RandomizedSigner` ([#231])
[#231]: https://github.com/RustCrypto/traits/pull/231
## 1.2.0 (2020-07-29) [YANKED]
- Note: this release was published without the intended changes
## 1.1.0 (2020-06-09)
### Changed
- Upgrade `digest` to v0.9; MSRV 1.41+ ([#186])
[#186]: https://github.com/RustCrypto/traits/pull/186
## 1.0.1 (2020-04-19)
### Changed
- Upgrade `signature_derive` to v1.0.0-pre.2 ([#98])
[#98]: https://github.com/RustCrypto/traits/pull/98
## 1.0.0 (2020-04-18)
Initial 1.0 release! 🎉
### Changed
- Rename `DigestSignature` => `PrehashSignature` ([#96])
[#96]: https://github.com/RustCrypto/traits/pull/96
## 1.0.0-pre.5 (2020-03-16)
### Changed
- Improve `Debug` impl on `Error` ([#89])
- Rename `Signature::as_slice` -> `as_bytes` ([#87])
[#89]: https://github.com/RustCrypto/traits/pull/89
[#87]: https://github.com/RustCrypto/traits/pull/87
## 1.0.0-pre.4 (2020-03-15)
### Added
- Mark preview features as unstable in `Cargo.toml` ([#82])
### Changed
- Have `Signature::from_bytes` take a byte slice ([#84])
- Ensure `Error::new()` is mandatory ([#83])
### Removed
- `BoxError` type alias ([#81])
[#84]: https://github.com/RustCrypto/traits/pull/84
[#83]: https://github.com/RustCrypto/traits/pull/83
[#82]: https://github.com/RustCrypto/traits/pull/82
[#81]: https://github.com/RustCrypto/traits/pull/81
## 1.0.0-pre.3 (2020-03-08)
### Fixed
- docs.rs rendering ([#76])
[#76]: https://github.com/RustCrypto/traits/pull/76
## 1.0.0-pre.2 (2020-03-08)
### Added
- `RandomizedSigner` trait ([#73])
- Design documentation ([#72])
### Changed
- Error cleanups ([#74])
- Crate moved to `RustCrypto/traits` ([#71])
[#74]: https://github.com/RustCrypto/traits/pull/74
[#73]: https://github.com/RustCrypto/traits/pull/73
[#72]: https://github.com/RustCrypto/traits/pull/72
[#71]: https://github.com/RustCrypto/traits/pull/71
## 1.0.0-pre.1 (2019-10-27)
### Changed
- Use `Error::source` instead of `::cause` ([RustCrypto/signatures#37])
### Removed
- Remove `alloc` feature; MSRV 1.34+ ([RustCrypto/signatures#38])
[RustCrypto/signatures#38]: https://github.com/RustCrypto/signatures/pull/38
[RustCrypto/signatures#37]: https://github.com/RustCrypto/signatures/pull/37
## 1.0.0-pre.0 (2019-10-11)
### Changed
- Revert removal of `DigestSignature` ([RustCrypto/signatures#33])
- 1.0 stabilization proposal ([RustCrypto/signatures#32])
[RustCrypto/signatures#33]: https://github.com/RustCrypto/signatures/pull/33
[RustCrypto/signatures#32]: https://github.com/RustCrypto/signatures/pull/32
## 0.3.0 (2019-10-10)
### Changed
- Simplify alloc gating; MSRV 1.36+ ([RustCrypto/signatures#28])
- Replace `DigestSignature` trait with `#[digest(...)]` attribute ([RustCrypto/signatures#27])
- signature_derive: Upgrade to 1.x proc macro crates ([RustCrypto/signatures#26])
[RustCrypto/signatures#28]: https://github.com/RustCrypto/signatures/pull/28
[RustCrypto/signatures#27]: https://github.com/RustCrypto/signatures/pull/27
[RustCrypto/signatures#26]: https://github.com/RustCrypto/signatures/pull/27
## 0.2.0 (2019-06-06)
### Added
- `signature_derive`: Custom derive support for `Signer`/`Verifier` ([RustCrypto/signatures#18])
### Changed
- Have `DigestSigner`/`DigestVerifier` take `Digest` instance ([RustCrypto/signatures#17])
[RustCrypto/signatures#18]: https://github.com/RustCrypto/signatures/pull/18
[RustCrypto/signatures#17]: https://github.com/RustCrypto/signatures/pull/17
## 0.1.0 (2019-05-25)
- Initial release

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.60"
name = "signature"
version = "2.2.0"
authors = ["RustCrypto Developers"]
description = "Traits for cryptographic signature algorithms (e.g. ECDSA, Ed25519)"
documentation = "https://docs.rs/signature"
readme = "README.md"
keywords = [
"crypto",
"ecdsa",
"ed25519",
"signature",
"signing",
]
categories = [
"cryptography",
"no-std",
]
license = "Apache-2.0 OR MIT"
repository = "https://github.com/RustCrypto/traits/tree/master/signature"
[package.metadata.docs.rs]
all-features = true
rustdoc-args = [
"--cfg",
"docsrs",
]
[dependencies.derive]
version = "2"
optional = true
package = "signature_derive"
[dependencies.digest]
version = "0.10.6"
optional = true
default-features = false
[dependencies.rand_core]
version = "0.6.4"
optional = true
default-features = false
[dev-dependencies.hex-literal]
version = "0.4"
[dev-dependencies.sha2]
version = "0.10"
default-features = false
[features]
alloc = []
std = [
"alloc",
"rand_core?/std",
]

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Copyright (c) 2018-2023 RustCrypto Developers
Permission is hereby granted, free of charge, to any
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# [RustCrypto]: Digital Signature Algorithms
[![crate][crate-image]][crate-link]
[![Docs][docs-image]][docs-link]
[![Build Status][build-image]][build-link]
![Apache2/MIT licensed][license-image]
![Rust Version][rustc-image]
[![Project Chat][chat-image]][chat-link]
This crate contains traits which provide generic, object-safe APIs for
generating and verifying [digital signatures].
Used by the [`dsa`], [`ecdsa`], [`ed25519`], and [`rsa`] crates maintained by
the [RustCrypto] organization, as well as [`ed25519-dalek`].
[Documentation][docs-link]
## Minimum Supported Rust Version
Rust **1.60** or higher.
Minimum supported Rust version can be changed in the future, but it will be
done with a minor version bump.
## SemVer Policy
- All on-by-default features of this library are covered by SemVer
- MSRV is considered exempt from SemVer as noted above
- The `derive` feature is stable and covered by SemVer
- The off-by-default features `digest` and `rand_core` are unstable features
which are also considered exempt from SemVer as they correspond to pre-1.0
crates which are still subject to changes. Breaking changes to these features
will, like MSRV, be done with a minor version bump.
## License
Licensed under either of
* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](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.
[//]: # (badges)
[crate-image]: https://buildstats.info/crate/signature
[crate-link]: https://crates.io/crates/signature
[docs-image]: https://docs.rs/signature/badge.svg
[docs-link]: https://docs.rs/signature/
[build-image]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml/badge.svg
[build-link]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260048-signatures
[//]: # (links)
[RustCrypto]: https://github.com/RustCrypto/
[digital signatures]: https://en.wikipedia.org/wiki/Digital_signature
[`dsa`]: https://github.com/RustCrypto/signatures/tree/master/dsa
[`ecdsa`]: https://github.com/RustCrypto/signatures/tree/master/ecdsa
[`ed25519`]: https://github.com/RustCrypto/signatures/tree/master/ed25519
[`ed25519-dalek`]: https://github.com/dalek-cryptography/ed25519-dalek
[`rsa`]: https://github.com/RustCrypto/RSA

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//! Encoding support.
#[cfg(feature = "alloc")]
use alloc::vec::Vec;
/// Support for decoding/encoding signatures as bytes.
pub trait SignatureEncoding:
Clone + Sized + for<'a> TryFrom<&'a [u8]> + TryInto<Self::Repr>
{
/// Byte representation of a signature.
type Repr: 'static + AsRef<[u8]> + Clone + Send + Sync;
/// Encode signature as its byte representation.
fn to_bytes(&self) -> Self::Repr {
self.clone()
.try_into()
.ok()
.expect("signature encoding error")
}
/// Encode signature as a byte vector.
#[cfg(feature = "alloc")]
fn to_vec(&self) -> Vec<u8> {
self.to_bytes().as_ref().to_vec()
}
/// Get the length of this signature when encoded.
fn encoded_len(&self) -> usize {
self.to_bytes().as_ref().len()
}
}

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//! Signature error types
use core::fmt::{self, Debug, Display};
#[cfg(feature = "std")]
use std::boxed::Box;
/// Result type.
///
/// A result with the `signature` crate's [`Error`] type.
pub type Result<T> = core::result::Result<T, Error>;
/// Signature errors.
///
/// This type is deliberately opaque as to avoid sidechannel leakage which
/// could potentially be used recover signing private keys or forge signatures
/// (e.g. [BB'06]).
///
/// When the `std` feature is enabled, it impls [`std::error::Error`] and
/// supports an optional [`std::error::Error::source`], which can be used by
/// things like remote signers (e.g. HSM, KMS) to report I/O or auth errors.
///
/// [BB'06]: https://en.wikipedia.org/wiki/Daniel_Bleichenbacher
#[derive(Default)]
#[non_exhaustive]
pub struct Error {
/// Source of the error (if applicable).
#[cfg(feature = "std")]
source: Option<Box<dyn std::error::Error + Send + Sync + 'static>>,
}
impl Error {
/// Create a new error with no associated source
pub fn new() -> Self {
Self::default()
}
/// Create a new error with an associated source.
///
/// **NOTE:** The "source" should **NOT** be used to propagate cryptographic
/// errors e.g. signature parsing or verification errors. The intended use
/// cases are for propagating errors related to external signers, e.g.
/// communication/authentication errors with HSMs, KMS, etc.
#[cfg(feature = "std")]
pub fn from_source(
source: impl Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
) -> Self {
Self {
source: Some(source.into()),
}
}
}
impl Debug for Error {
#[cfg(not(feature = "std"))]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature::Error {}")
}
#[cfg(feature = "std")]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature::Error { source: ")?;
if let Some(source) = &self.source {
write!(f, "Some({})", source)?;
} else {
f.write_str("None")?;
}
f.write_str(" }")
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("signature error")?;
#[cfg(feature = "std")]
{
if let Some(source) = &self.source {
write!(f, ": {}", source)?;
}
}
Ok(())
}
}
#[cfg(feature = "std")]
impl From<Box<dyn std::error::Error + Send + Sync + 'static>> for Error {
fn from(source: Box<dyn std::error::Error + Send + Sync + 'static>) -> Error {
Self::from_source(source)
}
}
#[cfg(feature = "rand_core")]
impl From<rand_core::Error> for Error {
#[cfg(not(feature = "std"))]
fn from(_source: rand_core::Error) -> Error {
Error::new()
}
#[cfg(feature = "std")]
fn from(source: rand_core::Error) -> Error {
Error::from_source(source)
}
}
#[cfg(feature = "std")]
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
self.source
.as_ref()
.map(|source| source.as_ref() as &(dyn std::error::Error + 'static))
}
}

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//! Hazardous Materials: low-level APIs which can be insecure if misused.
//!
//! The traits in this module are not generally recommended, and should only be
//! used in special cases where they are specifically needed.
//!
//! Using them incorrectly can introduce security vulnerabilities. Please
//! carefully read the documentation before attempting to use them.
use crate::Error;
#[cfg(feature = "rand_core")]
use crate::rand_core::CryptoRngCore;
/// Sign the provided message prehash, returning a digital signature.
pub trait PrehashSigner<S> {
/// Attempt to sign the given message digest, returning a digital signature
/// on success, or an error if something went wrong.
///
/// The `prehash` parameter should be the output of a secure cryptographic
/// hash function.
///
/// This API takes a `prehash` byte slice as there can potentially be many
/// compatible lengths for the message digest for a given concrete signature
/// algorithm.
///
/// Allowed lengths are algorithm-dependent and up to a particular
/// implementation to decide.
fn sign_prehash(&self, prehash: &[u8]) -> Result<S, Error>;
}
/// Sign the provided message prehash using the provided external randomness source, returning a digital signature.
#[cfg(feature = "rand_core")]
pub trait RandomizedPrehashSigner<S> {
/// Attempt to sign the given message digest, returning a digital signature
/// on success, or an error if something went wrong.
///
/// The `prehash` parameter should be the output of a secure cryptographic
/// hash function.
///
/// This API takes a `prehash` byte slice as there can potentially be many
/// compatible lengths for the message digest for a given concrete signature
/// algorithm.
///
/// Allowed lengths are algorithm-dependent and up to a particular
/// implementation to decide.
fn sign_prehash_with_rng(
&self,
rng: &mut impl CryptoRngCore,
prehash: &[u8],
) -> Result<S, Error>;
}
/// Verify the provided message prehash using `Self` (e.g. a public key)
pub trait PrehashVerifier<S> {
/// Use `Self` to verify that the provided signature for a given message
/// `prehash` is authentic.
///
/// The `prehash` parameter should be the output of a secure cryptographic
/// hash function.
///
/// Returns `Error` if it is inauthentic or some other error occurred, or
/// otherwise returns `Ok(())`.
///
/// # ⚠️ Security Warning
///
/// If `prehash` is something other than the output of a cryptographically
/// secure hash function, an attacker can potentially forge signatures by
/// solving a system of linear equations.
fn verify_prehash(&self, prehash: &[u8], signature: &S) -> Result<(), Error>;
}

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//! Signing keypairs.
/// Signing keypair with an associated verifying key.
///
/// This represents a type which holds both a signing key and a verifying key.
pub trait Keypair {
/// Verifying key type for this keypair.
type VerifyingKey: Clone;
/// Get the verifying key which can verify signatures produced by the
/// signing key portion of this keypair.
fn verifying_key(&self) -> Self::VerifyingKey;
}
/// Signing keypair with an associated verifying key.
///
/// This represents a type which holds both a signing key and a verifying key.
pub trait KeypairRef: AsRef<Self::VerifyingKey> {
/// Verifying key type for this keypair.
type VerifyingKey: Clone;
}
impl<K: KeypairRef> Keypair for K {
type VerifyingKey = <Self as KeypairRef>::VerifyingKey;
fn verifying_key(&self) -> Self::VerifyingKey {
self.as_ref().clone()
}
}

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#![no_std]
#![doc = include_str!("../README.md")]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/8f1a9894/logo.svg",
html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/8f1a9894/logo.svg"
)]
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
#![forbid(unsafe_code)]
#![warn(
clippy::mod_module_files,
clippy::unwrap_used,
missing_docs,
rust_2018_idioms,
unused_lifetimes,
unused_qualifications
)]
//! # Design
//!
//! This crate provides a common set of traits for signing and verifying
//! digital signatures intended to be implemented by libraries which produce
//! or contain implementations of digital signature algorithms, and used by
//! libraries which want to produce or verify digital signatures while
//! generically supporting any compatible backend.
//!
//! ## Goals
//!
//! The traits provided by this crate were designed with the following goals
//! in mind:
//!
//! - Provide an easy-to-use, misuse resistant API optimized for consumers
//! (as opposed to implementers) of its traits.
//! - Support common type-safe wrappers around "bag-of-bytes" representations
//! which can be directly parsed from or written to the "wire".
//! - Expose a trait/object-safe API where signers/verifiers spanning multiple
//! homogeneous provider implementations can be seamlessly leveraged together
//! in the same logical "keyring" so long as they operate on the same
//! underlying signature type.
//! - Allow one provider type to potentially implement support (including
//! being generic over) several signature types.
//! - Keep signature algorithm customizations / "knobs" out-of-band from the
//! signing/verification APIs, ideally pushing such concerns into the type
//! system so that algorithm mismatches are caught as type errors.
//! - Opaque error type which minimizes information leaked from cryptographic
//! failures, as "rich" error types in these scenarios are often a source
//! of sidechannel information for attackers (e.g. [BB'06])
//!
//! [BB'06]: https://en.wikipedia.org/wiki/Daniel_Bleichenbacher
//!
//! ## Implementation
//!
//! To accomplish the above goals, the [`Signer`] and [`Verifier`] traits
//! provided by this are generic over a signature value, and use generic
//! parameters rather than associated types. Notably, they use such a parameter
//! for the return value, allowing it to be inferred by the type checker based
//! on the desired signature type.
//!
//! ## Alternatives considered
//!
//! This crate is based on many years of exploration of how to encapsulate
//! digital signature systems in the most flexible, developer-friendly way.
//! During that time many design alternatives were explored, tradeoffs
//! compared, and ultimately the provided API was selected.
//!
//! The tradeoffs made in this API have all been to improve simplicity,
//! ergonomics, type safety, and flexibility for *consumers* of the traits.
//! At times, this has come at a cost to implementers. Below are some concerns
//! we are cognizant of which were considered in the design of the API:
//!
//! - "Bag-of-bytes" serialization precludes signature providers from using
//! their own internal representation of a signature, which can be helpful
//! for many reasons (e.g. advanced signature system features like batch
//! verification).
//! - Associated types, rather than generic parameters of traits, could allow
//! more customization of the types used by a particular signature system,
//! e.g. using custom error types.
//!
//! It may still make sense to continue to explore the above tradeoffs, but
//! with a *new* set of traits which are intended to be implementor-friendly,
//! rather than consumer friendly. The existing [`Signer`] and [`Verifier`]
//! traits could have blanket impls for the "provider-friendly" traits.
//! However, as noted above this is a design space easily explored after
//! stabilizing the consumer-oriented traits, and thus we consider these
//! more important.
//!
//! That said, below are some caveats of trying to design such traits, and
//! why we haven't actively pursued them:
//!
//! - Generics in the return position are already used to select which trait
//! impl to use, i.e. for a particular signature algorithm/system. Avoiding
//! a unified, concrete signature type adds another dimension to complexity
//! and compiler errors, and in our experience makes them unsuitable for this
//! sort of API. We believe such an API is the natural one for signature
//! systems, reflecting the natural way they are written absent a trait.
//! - Associated types preclude multiple implementations of the same trait.
//! These parameters are common in signature systems, notably ones which
//! support different serializations of a signature (e.g. raw vs ASN.1).
//! - Digital signatures are almost always larger than the present 32-entry
//! trait impl limitation on array types, which complicates bounds
//! for these types (particularly things like `From` or `Borrow` bounds).
//!
//! ## Unstable features
//!
//! Despite being post-1.0, this crate includes off-by-default unstable
//! optional features, each of which depends on a pre-1.0
//! crate.
//!
//! These features are considered exempt from SemVer. See the
//! [SemVer policy](#semver-policy) above for more information.
//!
//! The following unstable features are presently supported:
//!
//! - `digest`: enables the [`DigestSigner`] and [`DigestVerifier`]
//! traits which are based on the [`Digest`] trait from the [`digest`] crate.
//! These traits are used for representing signature systems based on the
//! [Fiat-Shamir heuristic] which compute a random challenge value to sign
//! by computing a cryptographically secure digest of the input message.
//! - `rand_core`: enables the [`RandomizedSigner`] trait for signature
//! systems which rely on a cryptographically secure random number generator
//! for security.
//!
//! NOTE: the [`async-signature`] crate contains experimental `async` support
//! for [`Signer`] and [`DigestSigner`].
//!
//! [`async-signature`]: https://docs.rs/async-signature
//! [`digest`]: https://docs.rs/digest/
//! [`Digest`]: https://docs.rs/digest/latest/digest/trait.Digest.html
//! [Fiat-Shamir heuristic]: https://en.wikipedia.org/wiki/Fiat%E2%80%93Shamir_heuristic
#[cfg(feature = "alloc")]
extern crate alloc;
#[cfg(feature = "std")]
extern crate std;
pub mod hazmat;
mod encoding;
mod error;
mod keypair;
mod signer;
mod verifier;
#[cfg(feature = "digest")]
mod prehash_signature;
pub use crate::{encoding::*, error::*, keypair::*, signer::*, verifier::*};
#[cfg(feature = "derive")]
pub use derive::{Signer, Verifier};
#[cfg(all(feature = "derive", feature = "digest"))]
pub use derive::{DigestSigner, DigestVerifier};
#[cfg(feature = "digest")]
pub use {crate::prehash_signature::*, digest};
#[cfg(feature = "rand_core")]
pub use rand_core;

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//! `PrehashSignature` trait.
/// For intra-doc link resolution.
#[allow(unused_imports)]
use crate::{
signer::{DigestSigner, Signer},
verifier::{DigestVerifier, Verifier},
};
/// Marker trait for `Signature` types computable as `𝐒(𝐇(𝒎))`
/// i.e. ones which prehash a message to be signed as `𝐇(𝒎)`
///
/// Where:
///
/// - `𝐒`: signature algorithm
/// - `𝐇`: hash (a.k.a. digest) function
/// - `𝒎`: message
///
/// This approach is relatively common in signature schemes based on the
/// [Fiat-Shamir heuristic].
///
/// For signature types that implement this trait, when the `derive` crate
/// feature is enabled a custom derive for [`Signer`] is available for any
/// types that impl [`DigestSigner`], and likewise for deriving [`Verifier`] for
/// types which impl [`DigestVerifier`].
///
/// [Fiat-Shamir heuristic]: https://en.wikipedia.org/wiki/Fiat%E2%80%93Shamir_heuristic
pub trait PrehashSignature {
/// Preferred `Digest` algorithm to use when computing this signature type.
type Digest: digest::Digest;
}

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//! Traits for generating digital signatures
use crate::error::Error;
#[cfg(feature = "digest")]
use crate::digest::Digest;
#[cfg(feature = "rand_core")]
use crate::rand_core::CryptoRngCore;
/// Sign the provided message bytestring using `Self` (e.g. a cryptographic key
/// or connection to an HSM), returning a digital signature.
pub trait Signer<S> {
/// Sign the given message and return a digital signature
fn sign(&self, msg: &[u8]) -> S {
self.try_sign(msg).expect("signature operation failed")
}
/// Attempt to sign the given message, returning a digital signature on
/// success, or an error if something went wrong.
///
/// The main intended use case for signing errors is when communicating
/// with external signers, e.g. cloud KMS, HSMs, or other hardware tokens.
fn try_sign(&self, msg: &[u8]) -> Result<S, Error>;
}
/// Sign the provided message bytestring using `&mut Self` (e.g. an evolving
/// cryptographic key such as a stateful hash-based signature), returning a
/// digital signature.
pub trait SignerMut<S> {
/// Sign the given message, update the state, and return a digital signature.
fn sign(&mut self, msg: &[u8]) -> S {
self.try_sign(msg).expect("signature operation failed")
}
/// Attempt to sign the given message, updating the state, and returning a
/// digital signature on success, or an error if something went wrong.
///
/// Signing can fail, e.g., if the number of time periods allowed by the
/// current key is exceeded.
fn try_sign(&mut self, msg: &[u8]) -> Result<S, Error>;
}
/// Blanket impl of [`SignerMut`] for all [`Signer`] types.
impl<S, T: Signer<S>> SignerMut<S> for T {
fn try_sign(&mut self, msg: &[u8]) -> Result<S, Error> {
T::try_sign(self, msg)
}
}
/// Sign the given prehashed message [`Digest`] using `Self`.
///
/// ## Notes
///
/// This trait is primarily intended for signature algorithms based on the
/// [Fiat-Shamir heuristic], a method for converting an interactive
/// challenge/response-based proof-of-knowledge protocol into an offline
/// digital signature through the use of a random oracle, i.e. a digest
/// function.
///
/// The security of such protocols critically rests upon the inability of
/// an attacker to solve for the output of the random oracle, as generally
/// otherwise such signature algorithms are a system of linear equations and
/// therefore doing so would allow the attacker to trivially forge signatures.
///
/// To prevent misuse which would potentially allow this to be possible, this
/// API accepts a [`Digest`] instance, rather than a raw digest value.
///
/// [Fiat-Shamir heuristic]: https://en.wikipedia.org/wiki/Fiat%E2%80%93Shamir_heuristic
#[cfg(feature = "digest")]
pub trait DigestSigner<D: Digest, S> {
/// Sign the given prehashed message [`Digest`], returning a signature.
///
/// Panics in the event of a signing error.
fn sign_digest(&self, digest: D) -> S {
self.try_sign_digest(digest)
.expect("signature operation failed")
}
/// Attempt to sign the given prehashed message [`Digest`], returning a
/// digital signature on success, or an error if something went wrong.
fn try_sign_digest(&self, digest: D) -> Result<S, Error>;
}
/// Sign the given message using the provided external randomness source.
#[cfg(feature = "rand_core")]
pub trait RandomizedSigner<S> {
/// Sign the given message and return a digital signature
fn sign_with_rng(&self, rng: &mut impl CryptoRngCore, msg: &[u8]) -> S {
self.try_sign_with_rng(rng, msg)
.expect("signature operation failed")
}
/// Attempt to sign the given message, returning a digital signature on
/// success, or an error if something went wrong.
///
/// The main intended use case for signing errors is when communicating
/// with external signers, e.g. cloud KMS, HSMs, or other hardware tokens.
fn try_sign_with_rng(&self, rng: &mut impl CryptoRngCore, msg: &[u8]) -> Result<S, Error>;
}
/// Combination of [`DigestSigner`] and [`RandomizedSigner`] with support for
/// computing a signature over a digest which requires entropy from an RNG.
#[cfg(all(feature = "digest", feature = "rand_core"))]
pub trait RandomizedDigestSigner<D: Digest, S> {
/// Sign the given prehashed message `Digest`, returning a signature.
///
/// Panics in the event of a signing error.
fn sign_digest_with_rng(&self, rng: &mut impl CryptoRngCore, digest: D) -> S {
self.try_sign_digest_with_rng(rng, digest)
.expect("signature operation failed")
}
/// Attempt to sign the given prehashed message `Digest`, returning a
/// digital signature on success, or an error if something went wrong.
fn try_sign_digest_with_rng(&self, rng: &mut impl CryptoRngCore, digest: D)
-> Result<S, Error>;
}

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//! Trait for verifying digital signatures
use crate::error::Error;
#[cfg(feature = "digest")]
use crate::digest::Digest;
/// Verify the provided message bytestring using `Self` (e.g. a public key)
pub trait Verifier<S> {
/// Use `Self` to verify that the provided signature for a given message
/// bytestring is authentic.
///
/// Returns `Error` if it is inauthentic, or otherwise returns `()`.
fn verify(&self, msg: &[u8], signature: &S) -> Result<(), Error>;
}
/// Verify the provided signature for the given prehashed message [`Digest`]
/// is authentic.
///
/// ## Notes
///
/// This trait is primarily intended for signature algorithms based on the
/// [Fiat-Shamir heuristic], a method for converting an interactive
/// challenge/response-based proof-of-knowledge protocol into an offline
/// digital signature through the use of a random oracle, i.e. a digest
/// function.
///
/// The security of such protocols critically rests upon the inability of
/// an attacker to solve for the output of the random oracle, as generally
/// otherwise such signature algorithms are a system of linear equations and
/// therefore doing so would allow the attacker to trivially forge signatures.
///
/// To prevent misuse which would potentially allow this to be possible, this
/// API accepts a [`Digest`] instance, rather than a raw digest value.
///
/// [Fiat-Shamir heuristic]: https://en.wikipedia.org/wiki/Fiat%E2%80%93Shamir_heuristic
#[cfg(feature = "digest")]
pub trait DigestVerifier<D: Digest, S> {
/// Verify the signature against the given [`Digest`] output.
fn verify_digest(&self, digest: D, signature: &S) -> Result<(), Error>;
}

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{"name":"signature","vers":"2.2.0","deps":[{"name":"derive","req":"^2","features":[],"optional":true,"default_features":true,"target":null,"kind":"normal","registry":"https://github.com/rust-lang/crates.io-index","package":"signature_derive","public":null,"artifact":null,"bindep_target":null,"lib":false},{"name":"digest","req":"^0.10.6","features":[],"optional":true,"default_features":false,"target":null,"kind":"normal","registry":"https://github.com/rust-lang/crates.io-index","package":null,"public":null,"artifact":null,"bindep_target":null,"lib":false},{"name":"rand_core","req":"^0.6.4","features":[],"optional":true,"default_features":false,"target":null,"kind":"normal","registry":"https://github.com/rust-lang/crates.io-index","package":null,"public":null,"artifact":null,"bindep_target":null,"lib":false},{"name":"hex-literal","req":"^0.4","features":[],"optional":false,"default_features":true,"target":null,"kind":"dev","registry":"https://github.com/rust-lang/crates.io-index","package":null,"public":null,"artifact":null,"bindep_target":null,"lib":false},{"name":"sha2","req":"^0.10","features":[],"optional":false,"default_features":false,"target":null,"kind":"dev","registry":"https://github.com/rust-lang/crates.io-index","package":null,"public":null,"artifact":null,"bindep_target":null,"lib":false}],"features":{"alloc":[],"std":["alloc","rand_core?/std"]},"features2":null,"cksum":"1f0f4bbcfae4bbc8d914c00232d3e0e510ccf196860703ad3c4bb8c504a6df1a","yanked":null,"links":null,"rust_version":null,"v":2}

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//! Tests for code generated by `signature_derive`
#![cfg(all(feature = "derive", feature = "digest"))]
use digest::{generic_array::GenericArray, Digest, OutputSizeUser};
use hex_literal::hex;
use sha2::Sha256;
use signature::{
hazmat::{PrehashSigner, PrehashVerifier},
DigestSigner, DigestVerifier, Error, PrehashSignature, SignatureEncoding, Signer, Verifier,
};
/// Test vector to compute SHA-256 digest of
const INPUT_STRING: &[u8] = b"abc";
/// Expected SHA-256 digest for the input string
const INPUT_STRING_DIGEST: [u8; 32] =
hex!("ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad");
type Repr = GenericArray<u8, <Sha256 as OutputSizeUser>::OutputSize>;
/// Dummy signature which just contains a digest output
#[derive(Clone, Debug)]
struct DummySignature(Repr);
impl PrehashSignature for DummySignature {
type Digest = Sha256;
}
impl SignatureEncoding for DummySignature {
type Repr = Repr;
}
impl TryFrom<&[u8]> for DummySignature {
type Error = Error;
fn try_from(bytes: &[u8]) -> Result<Self, Error> {
Ok(DummySignature(GenericArray::clone_from_slice(bytes)))
}
}
impl From<DummySignature> for Repr {
fn from(sig: DummySignature) -> Repr {
sig.0
}
}
/// Dummy signer which just returns the message digest as a `DummySignature`
#[derive(Signer, DigestSigner, Default)]
struct DummySigner {}
impl PrehashSigner<DummySignature> for DummySigner {
fn sign_prehash(&self, prehash: &[u8]) -> signature::Result<DummySignature> {
DummySignature::try_from(prehash)
}
}
/// Dummy verifier which ensures the `DummySignature` digest matches the
/// expected value.
///
/// Panics (via `assert_eq!`) if the value is not what is expected.
#[derive(Verifier, DigestVerifier, Default)]
struct DummyVerifier {}
impl PrehashVerifier<DummySignature> for DummyVerifier {
fn verify_prehash(&self, prehash: &[u8], signature: &DummySignature) -> signature::Result<()> {
assert_eq!(signature.to_bytes().as_slice(), prehash);
Ok(())
}
}
#[test]
fn derived_signer_impl() {
let sig: DummySignature = DummySigner::default().sign(INPUT_STRING);
assert_eq!(sig.to_bytes().as_slice(), INPUT_STRING_DIGEST.as_ref())
}
#[test]
fn derived_verifier_impl() {
let sig: DummySignature = DummySigner::default().sign(INPUT_STRING);
assert!(DummyVerifier::default().verify(INPUT_STRING, &sig).is_ok());
}