229 lines
6.3 KiB
C
229 lines
6.3 KiB
C
/* ed25519_sign.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 to demonstrate Ed25519 Sign */
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/*
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./configure --enable-ed25519 && make && sudo make install
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gcc -lwolfssl -o ed25519_sign ed25519_sign.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/sha256.h>
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#include <wolfssl/wolfcrypt/ed25519.h>
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#include <wolfssl/wolfcrypt/integer.h>
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#include <wolfssl/wolfcrypt/error-crypt.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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#if defined(HAVE_ED25519) && defined(HAVE_ED25519_SIGN) && \
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defined(HAVE_ED25519_VERIFY)
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/* Test Vector */
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static const uint8_t kMsg[] = {
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0x69, 0xbc, 0x9f, 0xce, 0x68, 0x17, 0xc2, 0x10,
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0xea, 0xfc, 0x10, 0x65, 0x67, 0x52, 0xed, 0x78,
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0x6e, 0xb8, 0x83, 0x9c, 0x9a, 0xb4, 0x56, 0x0d,
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0xc1, 0x0d, 0x1f, 0x78, 0x6e, 0x75, 0xd7, 0xbe,
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0x92, 0x6b, 0x12, 0xf6, 0x76, 0x60, 0x8e, 0xb1,
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0xf4, 0x19, 0x0c, 0x81, 0xe7, 0x54, 0x5e, 0xbc,
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0xe0, 0xae, 0xc2, 0x7d, 0x1b, 0xc4, 0x6e, 0xec,
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0xb1, 0x99, 0x6c, 0xbf, 0x0e, 0x38, 0xa8, 0x01,
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0xa6, 0x9a, 0x48, 0x12, 0xe4, 0xc9, 0x3b, 0xf0,
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0x63, 0x46, 0x15, 0xb4, 0x61, 0xa8, 0x1a, 0x60,
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0x71, 0x87, 0x98, 0xd7, 0x6f, 0x98, 0x7b, 0x2d,
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0xb9, 0x19, 0x1b, 0x21, 0x9c, 0x70, 0x58, 0xe8,
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0x0d, 0x0f, 0xe9, 0x2d, 0x9a, 0x9a, 0xf1, 0x55,
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0xa0, 0x4c, 0xd3, 0x07, 0xbd, 0x97, 0x48, 0xec,
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0x88, 0x0a, 0xaf, 0xb3, 0x80, 0x78, 0xa4, 0x59,
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0x43, 0x57, 0xd3, 0xa7, 0x01, 0x66, 0x0e, 0xfc
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};
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static const uint8_t kPrivKey[] = {
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/* k */
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0x88, 0x0d, 0xaa, 0xde, 0x32, 0xaa, 0x93, 0x32,
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0x79, 0xe2, 0x4e, 0x45, 0xa9, 0x1f, 0x26, 0xd0,
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0x9b, 0x69, 0xdd, 0x08, 0x33, 0xc7, 0x14, 0xc1,
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0x57, 0x7f, 0x20, 0xbe, 0x67, 0x4f, 0xb9, 0xeb,
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};
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static const uint8_t kPubKey[] = {
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/* y */
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0x37, 0x3e, 0xd5, 0x8d, 0x22, 0x1a, 0x05, 0x81,
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0xbf, 0x24, 0x6e, 0xdc, 0x5a, 0x42, 0x08, 0x83,
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0xff, 0xac, 0xfb, 0x28, 0xd0, 0x83, 0xb8, 0x2d,
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0x1c, 0xb7, 0x04, 0xaf, 0xa8, 0x41, 0x79, 0x23
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};
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/* perform verify of signature and message using public key */
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/* key is public y */
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/* sig is r + s */
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int crypto_ed25519_verify(const uint8_t *key, uint32_t keySz,
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const uint8_t *sig, uint32_t sigSz)
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{
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int ret, verify_res = 0;
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ed25519_key ed25519;
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/* validate arguments */
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if (key == NULL || sig == NULL) {
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return BAD_FUNC_ARG;
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}
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/* Setup the Ed25519 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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/* Import public key - compressed point */
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ret = wc_ed25519_import_public(
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(byte*)key, keySz, /* Public "y" Coordinate */
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&ed25519 /* key context */
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);
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/* Verify Ed25519 Signature */
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if (ret == 0) {
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ret = wc_ed25519_verify_msg(
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sig, sigSz, /* r/s encoded */
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kMsg, sizeof(kMsg), /* message */
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&verify_res, /* verification result 1=success */
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&ed25519 /* key context */
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);
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}
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/* check verify result */
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if (ret == 0 && verify_res == 0) {
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ret = SIG_VERIFY_E;
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}
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wc_ed25519_free(&ed25519);
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return ret;
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}
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/* perform signature operation against message using private and public key */
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int crypto_ed25519_sign(const uint8_t *key, uint32_t keySz,
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const uint8_t *pubKey, uint32_t pubKeySz, uint8_t *sig, uint32_t* sigSz)
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{
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int ret;
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ed25519_key ed25519;
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/* validate arguments */
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if (key == NULL || sig == NULL || sigSz == NULL) {
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return BAD_FUNC_ARG;
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}
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/* Initialize signature result */
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memset(sig, 0, ED25519_SIG_SIZE);
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/* Setup the Ed25519 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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/* Import private key "k" */
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ret = wc_ed25519_import_private_key(
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key, keySz, /* private key "k" */
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pubKey, pubKeySz, /* private key "k" */
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&ed25519 /* key context */
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);
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if (ret == 0) {
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/* Verify Ed25519 Signature */
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ret = wc_ed25519_sign_msg(
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kMsg, sizeof(kMsg), /* message */
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sig, sigSz, /* r/s as encoded data */
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&ed25519 /* key context */
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);
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}
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wc_ed25519_free(&ed25519);
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return ret;
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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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uint8_t sig[ED25519_SIG_SIZE];
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uint32_t sigSz = 0;
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#ifdef DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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#endif
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memset(sig, 0, sizeof(sig));
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/* Sign the message */
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sigSz = sizeof(sig);
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ret = crypto_ed25519_sign(
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kPrivKey, sizeof(kPrivKey), /* private key */
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kPubKey, sizeof(kPubKey), /* public key compressed point y */
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sig, &sigSz /* signature r/s */
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);
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if (ret == 0) {
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/* Verify generated signature is valid */
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ret = crypto_ed25519_verify(
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kPubKey, sizeof(kPubKey), /* public key point x/y */
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sig, sigSz /* signature r/s */
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);
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}
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if (ret == 0) {
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printf("Signature %d\n", sigSz);
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print_hex(sig, sigSz);
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printf("Success\n");
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}
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else {
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printf("Failure %d: %s\n", ret, wc_GetErrorString(ret));
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ret = 1;
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}
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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 requires Ed25519\n");
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return 1;
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}
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#endif /* HAVE_ED25519 && HAVE_ED25519_SIGN && HAVE_ED25519_VERIFY */
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