mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-09-16 04:50:25 -07:00
333 lines
9.0 KiB
C++
333 lines
9.0 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2026-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_IDENTITY_HPP
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#define ZT_IDENTITY_HPP
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#include <stdio.h>
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#include <stdlib.h>
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#include "Constants.hpp"
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#include "Utils.hpp"
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#include "Address.hpp"
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#include "C25519.hpp"
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#include "Buffer.hpp"
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#include "SHA512.hpp"
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#define ZT_IDENTITY_STRING_BUFFER_LENGTH 384
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namespace ZeroTier {
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/**
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* A ZeroTier identity
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*
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* An identity consists of a public key, a 40-bit ZeroTier address computed
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* from that key in a collision-resistant fashion, and a self-signature.
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*
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* The address derivation algorithm makes it computationally very expensive to
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* search for a different public key that duplicates an existing address. (See
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* code for deriveAddress() for this algorithm.)
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*/
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class Identity
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{
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public:
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Identity() :
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_privateKey((C25519::Private *)0)
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{
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}
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Identity(const Identity &id) :
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_address(id._address),
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_publicKey(id._publicKey),
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_privateKey((id._privateKey) ? new C25519::Private(*(id._privateKey)) : (C25519::Private *)0)
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{
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}
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Identity(const char *str) :
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_privateKey((C25519::Private *)0)
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{
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if (!fromString(str)) {
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throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_INVALID_TYPE;
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}
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}
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template<unsigned int C>
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Identity(const Buffer<C> &b,unsigned int startAt = 0) :
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_privateKey((C25519::Private *)0)
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{
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deserialize(b,startAt);
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}
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~Identity()
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{
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if (_privateKey) {
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Utils::burn(_privateKey,sizeof(C25519::Private));
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delete _privateKey;
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}
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}
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inline Identity &operator=(const Identity &id)
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{
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_address = id._address;
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_publicKey = id._publicKey;
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if (id._privateKey) {
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if (!_privateKey) {
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_privateKey = new C25519::Private();
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}
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*_privateKey = *(id._privateKey);
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} else {
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delete _privateKey;
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_privateKey = (C25519::Private *)0;
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}
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return *this;
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}
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/**
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* Generate a new identity (address, key pair)
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*
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* This is a time consuming operation.
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*/
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void generate();
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/**
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* Check the validity of this identity's pairing of key to address
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*
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* @return True if validation check passes
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*/
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bool locallyValidate() const;
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/**
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* @return True if this identity contains a private key
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*/
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inline bool hasPrivate() const { return (_privateKey != (C25519::Private *)0); }
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/**
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* Compute a SHA384 hash of this identity's address and public key(s).
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*
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* @param sha384buf Buffer with 48 bytes of space to receive hash
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*/
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inline void publicKeyHash(void *sha384buf) const
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{
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uint8_t address[ZT_ADDRESS_LENGTH];
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_address.copyTo(address, ZT_ADDRESS_LENGTH);
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SHA384(sha384buf, address, ZT_ADDRESS_LENGTH, _publicKey.data, ZT_C25519_PUBLIC_KEY_LEN);
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}
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/**
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* Compute the SHA512 hash of our private key (if we have one)
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*
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* @param sha Buffer to receive SHA512 (MUST be ZT_SHA512_DIGEST_LEN (64) bytes in length)
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* @return True on success, false if no private key
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*/
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inline bool sha512PrivateKey(void *sha) const
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{
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if (_privateKey) {
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SHA512(sha,_privateKey->data,ZT_C25519_PRIVATE_KEY_LEN);
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return true;
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}
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return false;
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}
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/**
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* Sign a message with this identity (private key required)
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*
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* @param data Data to sign
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* @param len Length of data
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*/
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inline C25519::Signature sign(const void *data,unsigned int len) const
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{
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if (_privateKey) {
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return C25519::sign(*_privateKey,_publicKey,data,len);
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}
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throw ZT_EXCEPTION_PRIVATE_KEY_REQUIRED;
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}
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/**
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* Verify a message signature against this identity
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*
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* @param data Data to check
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* @param len Length of data
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* @param signature Signature bytes
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* @param siglen Length of signature in bytes
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* @return True if signature validates and data integrity checks
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*/
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inline bool verify(const void *data,unsigned int len,const void *signature,unsigned int siglen) const
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{
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if (siglen != ZT_C25519_SIGNATURE_LEN) {
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return false;
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}
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return C25519::verify(_publicKey,data,len,signature);
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}
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/**
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* Verify a message signature against this identity
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*
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* @param data Data to check
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* @param len Length of data
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* @param signature Signature
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* @return True if signature validates and data integrity checks
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*/
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inline bool verify(const void *data,unsigned int len,const C25519::Signature &signature) const
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{
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return C25519::verify(_publicKey,data,len,signature);
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}
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/**
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* Shortcut method to perform key agreement with another identity
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*
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* This identity must have a private key. (Check hasPrivate())
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*
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* @param id Identity to agree with
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* @param key Result parameter to fill with key bytes
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* @return Was agreement successful?
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*/
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inline bool agree(const Identity &id,void *const key) const
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{
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if (_privateKey) {
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C25519::agree(*_privateKey,id._publicKey,key,ZT_SYMMETRIC_KEY_SIZE);
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return true;
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}
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return false;
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}
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/**
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* @return This identity's address
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*/
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inline const Address &address() const { return _address; }
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/**
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* Serialize this identity (binary)
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*
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* @param b Destination buffer to append to
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* @param includePrivate If true, include private key component (if present) (default: false)
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* @throws std::out_of_range Buffer too small
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*/
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template<unsigned int C>
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inline void serialize(Buffer<C> &b,bool includePrivate = false) const
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{
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_address.appendTo(b);
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b.append((uint8_t)0); // C25519/Ed25519 identity type
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b.append(_publicKey.data,ZT_C25519_PUBLIC_KEY_LEN);
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if ((_privateKey)&&(includePrivate)) {
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b.append((unsigned char)ZT_C25519_PRIVATE_KEY_LEN);
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b.append(_privateKey->data,ZT_C25519_PRIVATE_KEY_LEN);
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} else {
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b.append((unsigned char)0);
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}
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}
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/**
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* Deserialize a binary serialized identity
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*
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* If an exception is thrown, the Identity object is left in an undefined
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* state and should not be used.
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*
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* @param b Buffer containing serialized data
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* @param startAt Index within buffer of serialized data (default: 0)
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* @return Length of serialized data read from buffer
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* @throws std::out_of_range Serialized data invalid
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* @throws std::invalid_argument Serialized data invalid
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*/
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template<unsigned int C>
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inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
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{
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delete _privateKey;
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_privateKey = (C25519::Private *)0;
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unsigned int p = startAt;
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_address.setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
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p += ZT_ADDRESS_LENGTH;
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if (b[p++] != 0) {
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throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_INVALID_TYPE;
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}
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memcpy(_publicKey.data,b.field(p,ZT_C25519_PUBLIC_KEY_LEN),ZT_C25519_PUBLIC_KEY_LEN);
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p += ZT_C25519_PUBLIC_KEY_LEN;
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unsigned int privateKeyLength = (unsigned int)b[p++];
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if (privateKeyLength) {
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if (privateKeyLength != ZT_C25519_PRIVATE_KEY_LEN) {
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throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_INVALID_CRYPTOGRAPHIC_TOKEN;
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}
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_privateKey = new C25519::Private();
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memcpy(_privateKey->data,b.field(p,ZT_C25519_PRIVATE_KEY_LEN),ZT_C25519_PRIVATE_KEY_LEN);
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p += ZT_C25519_PRIVATE_KEY_LEN;
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}
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return (p - startAt);
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}
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/**
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* Serialize to a more human-friendly string
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*
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* @param includePrivate If true, include private key (if it exists)
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* @param buf Buffer to store string
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* @return ASCII string representation of identity
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*/
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char *toString(bool includePrivate,char buf[ZT_IDENTITY_STRING_BUFFER_LENGTH]) const;
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/**
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* Deserialize a human-friendly string
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*
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* Note: validation is for the format only. The locallyValidate() method
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* must be used to check signature and address/key correspondence.
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*
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* @param str String to deserialize
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* @return True if deserialization appears successful
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*/
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bool fromString(const char *str);
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/**
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* @return C25519 public key
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*/
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inline const C25519::Public &publicKey() const { return _publicKey; }
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/**
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* @return C25519 key pair (only returns valid pair if private key is present in this Identity object)
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*/
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inline const C25519::Pair privateKeyPair() const
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{
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C25519::Pair pair;
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pair.pub = _publicKey;
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if (_privateKey) {
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pair.priv = *_privateKey;
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} else {
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memset(pair.priv.data,0,ZT_C25519_PRIVATE_KEY_LEN);
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}
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return pair;
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}
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/**
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* @return True if this identity contains something
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*/
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inline operator bool() const { return (_address); }
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inline bool operator==(const Identity &id) const { return ((_address == id._address)&&(memcmp(_publicKey.data,id._publicKey.data,ZT_C25519_PUBLIC_KEY_LEN) == 0)); }
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inline bool operator<(const Identity &id) const { return ((_address < id._address)||((_address == id._address)&&(memcmp(_publicKey.data,id._publicKey.data,ZT_C25519_PUBLIC_KEY_LEN) < 0))); }
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inline bool operator!=(const Identity &id) const { return !(*this == id); }
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inline bool operator>(const Identity &id) const { return (id < *this); }
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inline bool operator<=(const Identity &id) const { return !(id < *this); }
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inline bool operator>=(const Identity &id) const { return !(*this < id); }
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private:
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Address _address;
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C25519::Public _publicKey;
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C25519::Private *_privateKey;
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};
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} // namespace ZeroTier
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#endif
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