mirror of
https://github.com/jwinterm/grin-wallet.git
synced 2026-11-11 18:13:56 +01:00
68 lines
2.1 KiB
Rust
68 lines
2.1 KiB
Rust
// Copyright 2021 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::Error;
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use grin_keychain::{ChildNumber, Identifier, Keychain, SwitchCommitmentType};
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use grin_util::secp::key::SecretKey;
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use crate::blake2::blake2b::blake2b;
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/// Derive a Slatepack address path from an output parent path and index.
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///
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/// Output paths:
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/// - account m/0: m/0/0/0, m/0/0/1
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/// - account m/1: m/1/0/0, m/1/0/1
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///
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/// Slatepack address paths:
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/// - account m/0: m/0/1/0, m/0/1/1
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/// - account m/1: m/1/1/0, m/1/1/1
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pub fn address_derivation_path(parent_key_id: &Identifier, index: u32) -> Identifier {
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let mut key_path = parent_key_id.to_path();
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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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Identifier::from_path(&key_path)
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}
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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 key_id = address_derivation_path(parent_key_id, index);
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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(keychain.secp(), hashed.as_bytes())?)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use grin_keychain::ExtKeychain;
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#[test]
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fn slatepack_address_path() {
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let parent = ExtKeychain::derive_key_id(2, 2, 0, 0, 0);
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let expected = ExtKeychain::derive_key_id(3, 2, 1, 3, 0);
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assert_eq!(address_derivation_path(&parent, 3), expected);
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}
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}
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