openethereum/secret_store/src/traits.rs
Niklas Adolfsson f9e64e0965 typo (#8640)
2018-05-16 20:09:59 +02:00

106 lines
5.9 KiB
Rust

// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
use std::collections::BTreeSet;
use ethkey::{KeyPair, Signature, Error as EthKeyError};
use ethereum_types::{H256, Address};
use types::{Error, Public, ServerKeyId, MessageHash, EncryptedMessageSignature, RequestSignature, Requester,
EncryptedDocumentKey, EncryptedDocumentKeyShadow, NodeId};
/// Node key pair.
pub trait NodeKeyPair: Send + Sync {
/// Public portion of key.
fn public(&self) -> &Public;
/// Address of key owner.
fn address(&self) -> Address;
/// Sign data with node key.
fn sign(&self, data: &H256) -> Result<Signature, EthKeyError>;
/// Compute shared key to encrypt channel between two nodes.
fn compute_shared_key(&self, peer_public: &Public) -> Result<KeyPair, EthKeyError>;
}
/// Server key (SK) generator.
pub trait ServerKeyGenerator {
/// Generate new SK.
/// `key_id` is the caller-provided identifier of generated SK.
/// `author` is the author of key entry.
/// `threshold + 1` is the minimal number of nodes, required to restore private key.
/// Result is a public portion of SK.
fn generate_key(&self, key_id: &ServerKeyId, author: &Requester, threshold: usize) -> Result<Public, Error>;
}
/// Document key (DK) server.
pub trait DocumentKeyServer: ServerKeyGenerator {
/// Store externally generated DK.
/// `key_id` is identifier of previously generated SK.
/// `author` is the same author, that has created the server key.
/// `common_point` is a result of `k * T` expression, where `T` is generation point and `k` is random scalar in EC field.
/// `encrypted_document_key` is a result of `M + k * y` expression, where `M` is unencrypted document key (point on EC),
/// `k` is the same scalar used in `common_point` calculation and `y` is previously generated public part of SK.
fn store_document_key(&self, key_id: &ServerKeyId, author: &Requester, common_point: Public, encrypted_document_key: Public) -> Result<(), Error>;
/// Generate and store both SK and DK. This is a shortcut for consequent calls of `generate_key` and `store_document_key`.
/// The only difference is that DK is generated by DocumentKeyServer (which might be considered unsafe).
/// `key_id` is the caller-provided identifier of generated SK.
/// `author` is the author of server && document key entry.
/// `threshold + 1` is the minimal number of nodes, required to restore private key.
/// Result is a DK, encrypted with caller public key.
fn generate_document_key(&self, key_id: &ServerKeyId, author: &Requester, threshold: usize) -> Result<EncryptedDocumentKey, Error>;
/// Restore previously stored DK.
/// DK is decrypted on the key server (which might be considered unsafe), and then encrypted with caller public key.
/// `key_id` is identifier of previously generated SK.
/// `requester` is the one who requests access to document key. Caller must be on ACL for this function to succeed.
/// Result is a DK, encrypted with caller public key.
fn restore_document_key(&self, key_id: &ServerKeyId, requester: &Requester) -> Result<EncryptedDocumentKey, Error>;
/// Restore previously stored DK.
/// To decrypt DK on client:
/// 1) use requestor secret key to decrypt secret coefficients from result.decrypt_shadows
/// 2) calculate decrypt_shadows_sum = sum of all secrets from (1)
/// 3) calculate decrypt_shadow_point: decrypt_shadows_sum * result.common_point
/// 4) calculate decrypted_secret: result.decrypted_secret + decrypt_shadow_point
/// Result is a DK shadow.
fn restore_document_key_shadow(&self, key_id: &ServerKeyId, requester: &Requester) -> Result<EncryptedDocumentKeyShadow, Error>;
}
/// Message signer.
pub trait MessageSigner: ServerKeyGenerator {
/// Generate Schnorr signature for message with previously generated SK.
/// `key_id` is the caller-provided identifier of generated SK.
/// `requester` is the one who requests access to server key private.
/// `message` is the message to be signed.
/// Result is a signed message, encrypted with caller public key.
fn sign_message_schnorr(&self, key_id: &ServerKeyId, requester: &Requester, message: MessageHash) -> Result<EncryptedMessageSignature, Error>;
/// Generate ECDSA signature for message with previously generated SK.
/// WARNING: only possible when SK was generated using t <= 2 * N.
/// `key_id` is the caller-provided identifier of generated SK.
/// `signature` is `key_id`, signed with caller public key.
/// `message` is the message to be signed.
/// Result is a signed message, encrypted with caller public key.
fn sign_message_ecdsa(&self, key_id: &ServerKeyId, signature: &Requester, message: MessageHash) -> Result<EncryptedMessageSignature, Error>;
}
/// Administrative sessions server.
pub trait AdminSessionsServer {
/// Change servers set so that nodes in new_servers_set became owners of shares for all keys.
/// And old nodes (i.e. cluster nodes except new_servers_set) have clear databases.
/// WARNING: newly generated keys will be distributed among all cluster nodes. So this session
/// must be followed with cluster nodes change (either via contract, or config files).
fn change_servers_set(&self, old_set_signature: RequestSignature, new_set_signature: RequestSignature, new_servers_set: BTreeSet<NodeId>) -> Result<(), Error>;
}
/// Key server.
pub trait KeyServer: AdminSessionsServer + DocumentKeyServer + MessageSigner + Send + Sync {
}