mirror of
https://github.com/eosswedenorg/libantelope
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140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/**
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* MIT License
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*
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* Copyright (c) 2019-2021 EOS Sw/eden
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef LIBEOSIO_EC_H
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#define LIBEOSIO_EC_H
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#include <libeosio/hash.hpp>
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#include <iostream>
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#include <array>
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namespace libeosio {
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/**
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* Elliptic curve private key size (in bytes)
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*/
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#define EC_PRIVKEY_SIZE 32
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/**
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* Elliptic curve public key size (in bytes)
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*
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* Compressed format: z||x, where byte z specifies which (of the 2) solutions
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* of the quadratic equation y is. Each cordinate is 32 bytes.
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*/
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#define EC_PUBKEY_SIZE (32 + 1)
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/**
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* Elliptic curve priv/pub key datastructures.
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*/
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typedef std::array<unsigned char, EC_PRIVKEY_SIZE> ec_privkey_t;
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typedef std::array<unsigned char, EC_PUBKEY_SIZE> ec_pubkey_t;
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/**
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* Elliptic curve keypair (public + private)
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*/
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struct ec_keypair {
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ec_privkey_t secret;
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ec_pubkey_t pub;
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};
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/**
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* Elliptic curve recoverable signature
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*
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* The signature consist of 2 integers r,s and v where
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* r: x cordinate of the random point
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* s: signature proof
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* v: recovery id (0, 1, 2 or 3), eg. what EC point is the public key.
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*
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* The memory layout is as follows:
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* r(32), s(32), v(1) = 65 bytes.
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*/
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/**
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* Elliptic curve signature key size (in bytes)
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*/
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#define EC_SIGNATURE_SIZE (32 + 32 + 1)
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/**
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* Elliptic curve signature datastructure.
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*/
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typedef std::array<unsigned char, EC_SIGNATURE_SIZE> ec_signature_t;
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/**
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* Initialize the ec library.
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*/
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int ec_init();
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/**
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* Generates an new random private key using the secp256k1 curve.
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*/
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int ec_generate_privkey(ec_privkey_t *priv);
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/**
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* Get the public key from an private key.
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*/
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int ec_get_publickey(const ec_privkey_t *priv, ec_pubkey_t* pub);
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/**
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* Generates a keypair using the secp256k1 curve.
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* public key is in compressed format.
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*/
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int ec_generate_key(struct ec_keypair *pair);
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/**
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* Sign
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*/
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/**
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* Create a ECDSA signature, returns -1 if an error occured or zero on success.
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*/
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int ecdsa_sign(const ec_privkey_t& key, const sha256_t* digest, ec_signature_t& sig);
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/**
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* Verify an ECDSA signature,
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* returns zero if the signature is correct. -1 if the signature is incorrect or an error occured.
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*/
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int ecdsa_verify(const sha256_t* digest, const ec_signature_t& sig, const ec_pubkey_t& key);
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/**
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* Recover the public key from the signature.
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* returns zero if the public key could be extracted. -1 if an error occured.
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*/
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int ecdsa_recover(const sha256_t* digest, const ec_signature_t& sig, ec_pubkey_t& key);
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/**
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* Shutdown the ec library.
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*/
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void ec_shutdown();
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} // namespace libeosio
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// Stream operators
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std::ostream& operator<<(std::ostream& os, const libeosio::ec_privkey_t& pk);
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std::ostream& operator<<(std::ostream& os, const libeosio::ec_pubkey_t& pk);
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#endif /* LIBEOSIO_EC_H */
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