99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/* ed25519_pub.c
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL 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 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* example code for extracting public from private */
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/*
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./configure && make && sudo make install
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gcc -lwolfssl -o ed25519_pub ed25519_pub.c
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*/
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#ifndef WOLFSSL_USER_SETTINGS
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#include <wolfssl/options.h>
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#endif
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/ed25519.h>
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#include <wolfssl/wolfcrypt/logging.h>
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#include <stdint.h>
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#include <stdio.h>
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#ifdef HAVE_ED25519
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/* Private key "k" only */
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static const uint8_t kPrivKey[] = {
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/* k */
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0x1e, 0xe7, 0x70, 0x07, 0xd3, 0x30, 0x94, 0x39,
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0x28, 0x90, 0xdf, 0x23, 0x88, 0x2c, 0x4a, 0x34,
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0x15, 0xdb, 0x4c, 0x43, 0xcd, 0xfa, 0xe5, 0x1f,
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0x3d, 0x4c, 0x37, 0xfe, 0x59, 0x3b, 0x96, 0xd8
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};
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static void print_hex(uint8_t* data, int sz)
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{
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int i;
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for (i = 0; i < sz; i++) {
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printf("%02X ", data[i]);
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if (i > 0 && ((i+1) % 16) == 0)
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printf("\n");
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}
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printf("\n");
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}
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int main()
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{
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int ret;
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ed25519_key ed25519;
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uint8_t pubKey[ED25519_PUB_KEY_SIZE];
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/* Setup the ECC key */
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ret = wc_ed25519_init(&ed25519);
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if (ret < 0) {
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return ret;
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}
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memset(pubKey, 0, sizeof(pubKey));
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/* Import private key "k" */
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ret = wc_ed25519_import_private_only(kPrivKey, sizeof(kPrivKey), &ed25519);
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/* Make public key into buffer */
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if (ret == 0) {
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ret = wc_ed25519_make_public(&ed25519, pubKey, ED25519_PUB_KEY_SIZE);
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}
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printf("Public Key: %d\n", ED25519_PUB_KEY_SIZE);
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print_hex(pubKey, ED25519_PUB_KEY_SIZE);
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wc_ed25519_free(&ed25519);
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return ret;
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}
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#else
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int main()
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{
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printf("wolfSSL needs to be built with Ed25519 enabled\n");
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return -1;
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}
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#endif /* HAVE_ED25519 */
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