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Create the signature facilities for arbitrary messages
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131
common/src/chain/transaction/signature/inputsig/arbitrary_message.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright (c) 2023 RBB S.r.l | ||
| // [email protected] | ||
| // SPDX-License-Identifier: MIT | ||
| // Licensed under the MIT License; | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://github.com/mintlayer/mintlayer-core/blob/master/LICENSE | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use serialization::Encode; | ||
|
|
||
| use crate::{ | ||
| chain::{signature::DestinationSigError, ChainConfig, Destination}, | ||
| primitives::{id::default_hash, H256}, | ||
| }; | ||
|
|
||
| use super::{ | ||
| authorize_pubkey_spend::{ | ||
| sign_pubkey_spending, verify_public_key_spending, AuthorizedPublicKeySpend, | ||
| }, | ||
| authorize_pubkeyhash_spend::{ | ||
| sign_address_spending, verify_address_spending, AuthorizedPublicKeyHashSpend, | ||
| }, | ||
| classical_multisig::authorize_classical_multisig::{ | ||
| verify_classical_multisig_spending, AuthorizedClassicalMultisigSpend, | ||
| }, | ||
| }; | ||
|
|
||
| #[derive(Debug, thiserror::Error)] | ||
| pub enum SignArbitraryMessageError { | ||
| #[error("Destination signature error: {0}")] | ||
| DestinationSigError(#[from] DestinationSigError), | ||
| #[error("AnyoneCanSpend should not use standard signatures, so producing a signature for it is not possible")] | ||
| AttemptedToProduceSignatureForAnyoneCanSpend, | ||
| #[error("Classical multisig signature attempted in uni-party function")] | ||
| AttemptedToProduceClassicalMultisigSignatureInUnipartySignatureCode, | ||
| #[error("Unsupported yet!")] | ||
| Unsupported, | ||
| } | ||
|
|
||
| pub struct SignedArbitraryMessage { | ||
| raw_signature: Vec<u8>, | ||
| } | ||
|
|
||
| fn produce_message_challenge(message: Vec<u8>) -> H256 { | ||
| let hashed_message = default_hash(&message); | ||
|
|
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| // Concatenate the message with its hash to prevent abusing signatures to trick users into signing transactions | ||
| let message = message | ||
| .into_iter() | ||
| .chain(hashed_message.as_bytes().to_vec()) | ||
| .collect::<Vec<_>>(); | ||
|
|
||
| // Harden it further by hashing that twice. Now it's impossible to make this useful for a transaction | ||
| default_hash(default_hash(message)) | ||
| } | ||
|
|
||
| impl SignedArbitraryMessage { | ||
| pub fn from_data(raw_signature: Vec<u8>) -> Self { | ||
| Self { raw_signature } | ||
| } | ||
|
|
||
| pub fn verify_signature( | ||
| &self, | ||
| chain_config: &ChainConfig, | ||
| outpoint_destination: &Destination, | ||
| challenge: &H256, | ||
| ) -> Result<(), DestinationSigError> { | ||
| match outpoint_destination { | ||
| Destination::Address(addr) => { | ||
| let sig_components = AuthorizedPublicKeyHashSpend::from_data(&self.raw_signature)?; | ||
| verify_address_spending(addr, &sig_components, challenge)? | ||
| } | ||
| Destination::PublicKey(pubkey) => { | ||
| let sig_components = AuthorizedPublicKeySpend::from_data(&self.raw_signature)?; | ||
| verify_public_key_spending(pubkey, &sig_components, challenge)? | ||
| } | ||
| Destination::ScriptHash(_) => return Err(DestinationSigError::Unsupported), | ||
| Destination::AnyoneCanSpend => { | ||
| // AnyoneCanSpend must use InputWitness::NoSignature, so this is unreachable | ||
| return Err( | ||
| DestinationSigError::AttemptedToVerifyStandardSignatureForAnyoneCanSpend, | ||
| ); | ||
| } | ||
| Destination::ClassicMultisig(h) => { | ||
| let sig_components = | ||
| AuthorizedClassicalMultisigSpend::from_data(&self.raw_signature)?; | ||
| verify_classical_multisig_spending(chain_config, h, &sig_components, challenge)? | ||
| } | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| pub fn produce_uniparty_signature( | ||
| private_key: &crypto::key::PrivateKey, | ||
| outpoint_destination: Destination, | ||
| message: Vec<u8>, | ||
| ) -> Result<Self, SignArbitraryMessageError> { | ||
| let challenge = produce_message_challenge(message); | ||
| let signature = | ||
| match outpoint_destination { | ||
| Destination::Address(ref addr) => { | ||
| let sig = sign_address_spending(private_key, addr, &challenge)?; | ||
| sig.encode() | ||
| } | ||
| Destination::PublicKey(ref pubkey) => { | ||
| let sig = sign_pubkey_spending(private_key, pubkey, &challenge)?; | ||
| sig.encode() | ||
| } | ||
| Destination::ScriptHash(_) => return Err(SignArbitraryMessageError::Unsupported), | ||
|
|
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| Destination::AnyoneCanSpend => { | ||
| // AnyoneCanSpend must use InputWitness::NoSignature, so this is unreachable | ||
| return Err(SignArbitraryMessageError::AttemptedToProduceSignatureForAnyoneCanSpend); | ||
| } | ||
| Destination::ClassicMultisig(_) => return Err( | ||
| // This function doesn't support this kind of signature | ||
| SignArbitraryMessageError::AttemptedToProduceClassicalMultisigSignatureInUnipartySignatureCode, | ||
| ), | ||
| }; | ||
| Ok(Self { | ||
| raw_signature: signature, | ||
| }) | ||
| } | ||
| } |
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