55 lines
1.7 KiB
Rust
55 lines
1.7 KiB
Rust
/*
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*
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* Copyright (c) 2020-2022 Project CHIP Authors
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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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*/
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use crate::{
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crypto::{self, SYMM_KEY_LEN_BYTES},
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error::Error,
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tlv::{FromTLV, TLVElement, TLVWriter, TagType, ToTLV},
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};
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type KeySetKey = [u8; SYMM_KEY_LEN_BYTES];
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#[derive(Debug, Default, FromTLV, ToTLV)]
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pub struct KeySet {
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pub epoch_key: KeySetKey,
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pub op_key: KeySetKey,
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}
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impl KeySet {
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pub fn new(epoch_key: &[u8], compressed_id: &[u8]) -> Result<Self, Error> {
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let mut ks = KeySet::default();
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KeySet::op_key_from_ipk(epoch_key, compressed_id, &mut ks.op_key)?;
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ks.epoch_key.copy_from_slice(epoch_key);
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Ok(ks)
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}
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fn op_key_from_ipk(ipk: &[u8], compressed_id: &[u8], opkey: &mut [u8]) -> Result<(), Error> {
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const GRP_KEY_INFO: [u8; 13] = [
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0x47, 0x72, 0x6f, 0x75, 0x70, 0x4b, 0x65, 0x79, 0x20, 0x76, 0x31, 0x2e, 0x30,
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];
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crypto::hkdf_sha256(compressed_id, ipk, &GRP_KEY_INFO, opkey).map_err(|_| Error::NoSpace)
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}
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pub fn op_key(&self) -> &[u8] {
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&self.op_key
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}
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pub fn epoch_key(&self) -> &[u8] {
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&self.epoch_key
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}
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}
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