mirror of
https://github.com/zerotier/ZeroTierOne.git
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96 lines
2.6 KiB
C++
96 lines
2.6 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: 2023-01-01
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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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// This is glue code to ease the use of the NIST P-384 elliptic curve.
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// Note that most of the code inside ECC384.cpp is third party code and
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// is under the BSD 2-clause license rather than ZeroTier's license.
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#ifndef ZT_ECC384_HPP
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#define ZT_ECC384_HPP
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#include "Constants.hpp"
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/**
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* Size of a (point compressed) P-384 public key
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*/
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#define ZT_ECC384_PUBLIC_KEY_SIZE 49
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/**
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* Size of a P-384 private key
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*/
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#define ZT_ECC384_PRIVATE_KEY_SIZE 48
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/**
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* Size of the hash that should be signed using P-384
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*/
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#define ZT_ECC384_SIGNATURE_HASH_SIZE 48
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/**
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* Size of a P-384 signature
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*/
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#define ZT_ECC384_SIGNATURE_SIZE 96
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/**
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* Size of raw shared secret generated by ECDH key agreement
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*/
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#define ZT_ECC384_SHARED_SECRET_SIZE 48
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namespace ZeroTier {
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/**
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* Generate a NIST P-384 key pair
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*
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* @param pub Buffer to receive point compressed public key
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* @param priv Buffer to receiver private key
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*/
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void ECC384GenerateKey(uint8_t pub[ZT_ECC384_PUBLIC_KEY_SIZE],uint8_t priv[ZT_ECC384_PRIVATE_KEY_SIZE]);
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/**
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* Sign a hash with a NIST P-384 private key
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*
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* The hash must be 48 bytes in size. If it's longer only the first 48
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* bytes are used.
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*
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* @param priv Private key
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* @param hash 48-byte hash
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* @param sig Buffer to receive signature
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*/
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void ECC384ECDSASign(const uint8_t priv[ZT_ECC384_PRIVATE_KEY_SIZE],const uint8_t hash[ZT_ECC384_SIGNATURE_HASH_SIZE],uint8_t sig[ZT_ECC384_SIGNATURE_SIZE]);
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/**
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* Verify a signature
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*
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* @param pub Public key
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* @param hash 48-byte hash (usually first 48 bytes of SHA512(msg))
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* @param sig Signature to check
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* @return True if signature is valid
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*/
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bool ECC384ECDSAVerify(const uint8_t pub[ZT_ECC384_PUBLIC_KEY_SIZE],const uint8_t hash[ZT_ECC384_SIGNATURE_HASH_SIZE],const uint8_t sig[ZT_ECC384_SIGNATURE_SIZE]);
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/**
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* Perform ECDH key agreement
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*
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* The secret generated here is the raw 48-byte result of ECDH.
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* It's typically hashed prior to use.
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*
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* @param theirPub Remote public key
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* @param ourPriv Local private key
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* @param secret Buffer to receive 48-byte secret
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*/
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bool ECC384ECDH(const uint8_t theirPub[ZT_ECC384_PUBLIC_KEY_SIZE],const uint8_t ourPriv[ZT_ECC384_PRIVATE_KEY_SIZE],uint8_t secret[ZT_ECC384_SHARED_SECRET_SIZE]);
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} // namespace ZeroTier
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#endif
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