mirror of
https://github.com/jwinterm/grin-wallet.git
synced 2026-10-17 07:11:36 +02:00
Quentin Le ScellerandGitHub
1116bc5545
* API cleanup * Config cleanup * Impl cleanup * Libwallet cleanup * Additionnal simplification
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
// Copyright 2019 The Grin Develope;
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Functions defining wallet 'addresses', i.e. ed2559 keys based on
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//! a derivation path
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use crate::grin_util::secp::key::SecretKey;
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use crate::Error;
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use grin_wallet_util::grin_keychain::{ChildNumber, Identifier, Keychain, SwitchCommitmentType};
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use crate::blake2::blake2b::blake2b;
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/// Derive a secret key given a derivation path and index
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pub fn address_from_derivation_path<K>(
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keychain: &K,
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parent_key_id: &Identifier,
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index: u32,
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) -> Result<SecretKey, Error>
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where
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K: Keychain,
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{
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let mut key_path = parent_key_id.to_path();
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// An output derivation for acct m/0
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// is m/0/0/0, m/0/0/1 (for instance), m/1 is m/1/0/0, m/1/0/1
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// Address generation path should be
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// for m/0: m/0/1/0, m/0/1/1
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// for m/1: m/1/1/0, m/1/1/1
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key_path.path[1] = ChildNumber::from(1);
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key_path.depth += 1;
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key_path.path[key_path.depth as usize - 1] = ChildNumber::from(index);
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let key_id = Identifier::from_path(&key_path);
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let sec_key = keychain.derive_key(0, &key_id, &SwitchCommitmentType::None)?;
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let hashed = blake2b(32, &[], &sec_key.0[..]);
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Ok(SecretKey::from_slice(
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&keychain.secp(),
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&hashed.as_bytes()[..],
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)?)
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}
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