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110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
// Copyright 2018 Chia Network Inc
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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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// http://www.apache.org/licenses/LICENSE-2.0
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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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#ifndef SRC_EXTENDEDPUBLICKEY_HPP_
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#define SRC_EXTENDEDPUBLICKEY_HPP_
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#include "relic_conf.h"
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#include <vector>
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#if defined GMP && ARITH == GMP
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#include <gmp.h>
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#endif
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#include "chaincode.hpp"
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#include "elements.hpp"
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#include "relic.h"
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#include "relic_test.h"
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namespace bls {
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/*
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Defines a BIP-32 style node, which is composed of a private key and a
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chain code. This follows the spec from BIP-0032, with a few changes:
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* The master secret key is generated mod n from the master seed,
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since not all 32 byte sequences are valid BLS private keys
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* Instead of SHA512(input), do SHA256(input || 00000000) ||
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SHA256(input || 00000001)
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* Mod n for the output of key derivation.
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* ID of a key is SHA256(pk) instead of HASH160(pk)
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* Serialization of extended public key is 93 bytes
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*/
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class ExtendedPublicKey {
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public:
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static const uint32_t REVISION = 1;
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// version(4) depth(1) parent fingerprint(4) child#(4) cc(32) pk(48)
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static const uint32_t SIZE = 93;
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// Parse public key and chain code from bytes
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static ExtendedPublicKey FromBytes(const Bytes& bytes, bool fLegacy = true);
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// Derive a child extended public key, cannot be hardened
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ExtendedPublicKey PublicChild(uint32_t i, bool fLegacy = true) const;
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uint32_t GetVersion() const;
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uint8_t GetDepth() const;
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uint32_t GetParentFingerprint() const;
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uint32_t GetChildNumber() const;
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ChainCode GetChainCode() const;
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G1Element GetPublicKey() const;
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// Comparator implementation.
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friend bool operator==(ExtendedPublicKey const &a,
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ExtendedPublicKey const &b);
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friend bool operator!=(ExtendedPublicKey const &a,
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ExtendedPublicKey const &b);
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friend std::ostream &operator<<(std::ostream &os,
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ExtendedPublicKey const &s);
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void Serialize(uint8_t *buffer, bool fLegacy = true) const;
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std::vector<uint8_t> Serialize(bool fLegacy = true) const;
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// Blank public constructor
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ExtendedPublicKey()
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: version(0),
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depth(0),
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parentFingerprint(0),
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childNumber(0),
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chainCode(ChainCode()),
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pk(G1Element()) {}
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private:
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// private constructor, force use of static methods
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explicit ExtendedPublicKey(const uint32_t v, const uint8_t d,
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const uint32_t pfp, const uint32_t cn,
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const ChainCode code, const G1Element key)
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: version(v),
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depth(d),
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parentFingerprint(pfp),
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childNumber(cn),
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chainCode(code),
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pk(key) {}
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uint32_t version;
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uint8_t depth;
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uint32_t parentFingerprint;
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uint32_t childNumber;
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ChainCode chainCode;
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G1Element pk;
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};
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} // end namespace bls
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#endif // SRC_EXTENDEDPUBLICKEY_HPP_
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