mirror of
https://github.com/eosswedenorg/libantelope
synced 2026-06-16 03:34:56 +02:00
141 lines
3.3 KiB
C++
141 lines
3.3 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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#include <openssl/ec.h>
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#include <openssl/bn.h>
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#include <openssl/hmac.h>
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#include <libeosio/ec.hpp>
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namespace libeosio {
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#define EC_POINT_encode(group, point, buf, len, ctx) \
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EC_POINT_point2oct((group), (point), POINT_CONVERSION_COMPRESSED, (buf), (len), (ctx))
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BN_CTX *ctx = NULL;
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EC_KEY *k = NULL;
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int ec_init() {
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ctx = BN_CTX_new();
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if (ctx == NULL) {
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return -1;
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}
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// Construct curve.
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k = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (k == NULL) {
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BN_CTX_free(ctx);
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return -1;
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}
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return 0;
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}
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void ec_shutdown() {
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if (ctx) {
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BN_CTX_free(ctx);
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ctx = NULL;
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}
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if (k) {
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EC_KEY_free(k);
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k = NULL;
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}
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}
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int ec_generate_privkey(ec_privkey_t *priv) {
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// Generate new private key.
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if (EC_KEY_generate_key(k) == 0) {
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return -1;
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}
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if (EC_KEY_priv2oct(k, priv->data(), EC_PRIVKEY_SIZE) == 0) {
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return -1;
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}
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return 0;
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}
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// Calcualte a public key from a EC_KEY object.
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int calculate_pubkey(EC_KEY *ec_key, ec_pubkey_t *pub) {
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const BIGNUM* pk;
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const EC_GROUP *group;
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EC_POINT *point;
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int rc;
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// Get the curve (group) number first.
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if ((group = EC_KEY_get0_group(ec_key)) == NULL) {
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return 0;
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}
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// Then get the private key number
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if ((pk = EC_KEY_get0_private_key(ec_key)) == NULL) {
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return 0;
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}
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// Create a new point.
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if ((point = EC_POINT_new(group)) == NULL) {
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return 0;
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}
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// Multiply curve (group) and private key to get the public key.
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rc = EC_POINT_mul(group, point, pk, NULL, NULL, ctx);
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if (rc != 0) {
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// Encode public key
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rc = EC_POINT_encode(group, point, pub->data(), EC_PUBKEY_SIZE, ctx);
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}
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EC_POINT_free(point);
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return rc;
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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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// Load private key
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if (EC_KEY_oct2priv(k, priv->data(), EC_PRIVKEY_SIZE) == 0) {
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return -1;
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}
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return calculate_pubkey(k, pub) == 0 ? -1 : 0;
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}
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int ec_generate_key(struct ec_keypair *pair) {
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// Generate new key pair.
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if (EC_KEY_generate_key(k) != 1) {
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return -1;
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}
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// Copy private key to binary format.
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EC_KEY_priv2oct(k, pair->secret.data(), EC_PRIVKEY_SIZE);
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// Copy public key
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EC_POINT_point2oct(EC_KEY_get0_group(k),
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EC_KEY_get0_public_key(k), POINT_CONVERSION_COMPRESSED,
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pair->pub.data(), EC_PUBKEY_SIZE, ctx);
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return 0;
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}
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} // namespace libeosio
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