mirror of
https://github.com/zerotier/ZeroTierOne.git
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214 lines
6.1 KiB
C++
214 lines
6.1 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_C25519_HPP
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#define ZT_C25519_HPP
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#include "Array.hpp"
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#include "Utils.hpp"
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namespace ZeroTier {
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#define ZT_C25519_PUBLIC_KEY_LEN 64
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#define ZT_C25519_PRIVATE_KEY_LEN 64
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#define ZT_C25519_SIGNATURE_LEN 96
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/**
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* A combined Curve25519 ECDH and Ed25519 signature engine
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*/
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class C25519
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{
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public:
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/**
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* Public key (both crypto and signing)
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*/
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typedef Array<unsigned char,ZT_C25519_PUBLIC_KEY_LEN> Public; // crypto key, signing key (both 32 bytes)
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/**
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* Private key (both crypto and signing)
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*/
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typedef Array<unsigned char,ZT_C25519_PRIVATE_KEY_LEN> Private; // crypto key, signing key (both 32 bytes)
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/**
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* Message signature
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*/
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typedef Array<unsigned char,ZT_C25519_SIGNATURE_LEN> Signature;
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/**
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* Public/private key pair
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*/
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typedef struct {
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Public pub;
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Private priv;
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} Pair;
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/**
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* Generate a C25519 elliptic curve key pair
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*/
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static inline Pair generate()
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throw()
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{
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Pair kp;
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Utils::getSecureRandom(kp.priv.data,(unsigned int)kp.priv.size());
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_calcPubDH(kp);
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_calcPubED(kp);
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return kp;
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}
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/**
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* Generate a key pair satisfying a condition
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*
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* This begins with a random keypair from a random secret key and then
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* iteratively increments the random secret until cond(kp) returns true.
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* This is used to compute key pairs in which the public key, its hash
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* or some other aspect of it satisfies some condition, such as for a
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* hashcash criteria.
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*
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* @param cond Condition function or function object
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* @return Key pair where cond(kp) returns true
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* @tparam F Type of 'cond'
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*/
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template<typename F>
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static inline Pair generateSatisfying(F cond)
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throw()
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{
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Pair kp;
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void *const priv = (void *)kp.priv.data;
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Utils::getSecureRandom(priv,(unsigned int)kp.priv.size());
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_calcPubED(kp); // do Ed25519 key -- bytes 32-63 of pub and priv
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do {
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++(((uint64_t *)priv)[1]);
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--(((uint64_t *)priv)[2]);
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_calcPubDH(kp); // keep regenerating bytes 0-31 until satisfied
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} while (!cond(kp));
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return kp;
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}
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/**
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* Perform C25519 ECC key agreement
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*
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* Actual key bytes are generated from one or more SHA-512 digests of
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* the raw result of key agreement.
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*
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* @param mine My private key
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* @param their Their public key
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* @param keybuf Buffer to fill
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* @param keylen Number of key bytes to generate
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*/
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static void agree(const Private &mine,const Public &their,void *keybuf,unsigned int keylen)
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throw();
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static inline void agree(const Pair &mine,const Public &their,void *keybuf,unsigned int keylen)
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throw()
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{
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agree(mine.priv,their,keybuf,keylen);
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}
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/**
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* Sign a message with a sender's key pair
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*
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* This takes the SHA-521 of msg[] and then signs the first 32 bytes of this
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* digest, returning it and the 64-byte ed25519 signature in signature[].
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* This results in a signature that verifies both the signer's authenticity
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* and the integrity of the message.
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*
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* This is based on the original ed25519 code from NaCl and the SUPERCOP
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* cipher benchmark suite, but with the modification that it always
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* produces a signature of fixed 96-byte length based on the hash of an
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* arbitrary-length message.
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*
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* @param myPrivate My private key
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* @param myPublic My public key
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* @param msg Message to sign
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* @param len Length of message in bytes
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* @param signature Buffer to fill with signature -- MUST be 96 bytes in length
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*/
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static void sign(const Private &myPrivate,const Public &myPublic,const void *msg,unsigned int len,void *signature)
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throw();
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static inline void sign(const Pair &mine,const void *msg,unsigned int len,void *signature)
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throw()
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{
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sign(mine.priv,mine.pub,msg,len,signature);
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}
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/**
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* Sign a message with a sender's key pair
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*
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* @param myPrivate My private key
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* @param myPublic My public key
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* @param msg Message to sign
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* @param len Length of message in bytes
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* @return Signature
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*/
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static inline Signature sign(const Private &myPrivate,const Public &myPublic,const void *msg,unsigned int len)
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throw()
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{
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Signature sig;
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sign(myPrivate,myPublic,msg,len,sig.data);
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return sig;
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}
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static inline Signature sign(const Pair &mine,const void *msg,unsigned int len)
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throw()
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{
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Signature sig;
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sign(mine.priv,mine.pub,msg,len,sig.data);
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return sig;
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}
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/**
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* Verify a message's signature
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*
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* @param their Public key to verify against
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* @param msg Message to verify signature integrity against
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* @param len Length of message in bytes
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* @param signature 96-byte signature
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* @return True if signature is valid and the message is authentic and unmodified
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*/
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static bool verify(const Public &their,const void *msg,unsigned int len,const void *signature)
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throw();
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/**
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* Verify a message's signature
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*
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* @param their Public key to verify against
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* @param msg Message to verify signature integrity against
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* @param len Length of message in bytes
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* @param signature 96-byte signature
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* @return True if signature is valid and the message is authentic and unmodified
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*/
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static inline bool verify(const Public &their,const void *msg,unsigned int len,const Signature &signature)
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throw()
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{
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return verify(their,msg,len,signature.data);
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}
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private:
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// derive first 32 bytes of kp.pub from first 32 bytes of kp.priv
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// this is the ECDH key
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static void _calcPubDH(Pair &kp)
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throw();
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// derive 2nd 32 bytes of kp.pub from 2nd 32 bytes of kp.priv
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// this is the Ed25519 sign/verify key
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static void _calcPubED(Pair &kp)
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throw();
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};
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} // namespace ZeroTier
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#endif
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