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// Copyright 2020 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Submodule of crypto utils for working with public key crypto primitives
//! If you are looking for git history please refer to the `ethkey` crate in the `parity-ethereum` repository.

mod ecdsa_signature;
mod extended_keys;
mod keypair;
mod keypair_generator;
mod secret_key;

pub mod ec_math_utils;
pub mod ecdh;
pub mod ecies;
pub mod error;

pub use self::ecdsa_signature::{
	recover, recover_allowing_all_zero_message, sign, verify_address, verify_public, Signature,
};
pub use self::error::Error;
pub use self::extended_keys::{Derivation, DerivationError, ExtendedKeyPair, ExtendedPublic, ExtendedSecret};
pub use self::keypair::{public_to_address, KeyPair};
pub use self::keypair_generator::Random;
pub use self::secret_key::{Secret, ZeroizeSecretKey};

use ethereum_types::H256;
use lazy_static::lazy_static;

pub use ethereum_types::{Address, Public};
pub type Message = H256;

use secp256k1::ThirtyTwoByteHash;

/// In ethereum we allow public key recovery from a signature + message pair
/// where the message is all-zeroes. This conflicts with the best practise of
/// not allowing such values and so in order to avoid breaking consensus we need
/// this to work around it. The `ZeroesAllowedType` wraps an `H256` that can be
/// converted to a `[u8; 32]` which in turn can be cast to a
/// `secp256k1::Message` by the `ThirtyTwoByteHash` and satisfy the API for
/// `recover()`.
pub struct ZeroesAllowedMessage(pub H256);
impl ThirtyTwoByteHash for ZeroesAllowedMessage {
	fn into_32(self) -> [u8; 32] {
		self.0.to_fixed_bytes()
	}
}

/// The number -1 encoded as a secret key
const MINUS_ONE_KEY: &'static [u8] = &[
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xba, 0xae, 0xdc,
	0xe6, 0xaf, 0x48, 0xa0, 0x3b, 0xbf, 0xd2, 0x5e, 0x8c, 0xd0, 0x36, 0x41, 0x40,
];

lazy_static! {
	static ref SECP256K1: secp256k1::Secp256k1<secp256k1::All> = secp256k1::Secp256k1::new();
}

/// Generates new keypair.
pub trait Generator {
	/// Should be called to generate new keypair.
	fn generate(&mut self) -> KeyPair;
}