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/*
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* Copyright (C) 2018 Anderson Toshiyuki Sasaki
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* Copyright (c) 2018 Red Hat, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/engine.h>
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#include <openssl/rand.h>
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#include <openssl/conf.h>
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static void display_openssl_errors(int l)
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{
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const char *file;
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char buf[120];
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int e, line;
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if (ERR_peek_error() == 0)
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return;
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fprintf(stderr, "At main.c:%d:\n", l);
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while ((e = ERR_get_error_line(&file, &line))) {
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ERR_error_string(e, buf);
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fprintf(stderr, "- SSL %s: %s:%d\n", buf, file, line);
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}
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}
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int main(int argc, char **argv)
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{
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EVP_PKEY *private_key, *public_key;
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EVP_PKEY_CTX *pkey_ctx;
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char *private_key_name, *public_key_name;
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unsigned char data[32];
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size_t data_len;
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unsigned char dec[4096];
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size_t dec_len;
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unsigned char enc[4096];
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size_t enc_len;
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char *key_pass = NULL;
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const char *module_path, *efile;
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ENGINE *e;
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int ret;
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if (argc < 5) {
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fprintf(stderr, "usage: %s [PIN] [CONF] [private key URL] [public key URL] [module]\n", argv[0]);
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fprintf(stderr, "\n");
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exit(1);
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}
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key_pass = argv[1];
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efile = argv[2];
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private_key_name = argv[3];
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public_key_name = argv[4];
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module_path = argv[5];
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ret = CONF_modules_load_file(efile, "engines", 0);
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if (ret <= 0) {
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fprintf(stderr, "cannot load %s\n", efile);
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display_openssl_errors(__LINE__);
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exit(1);
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}
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ENGINE_add_conf_module();
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#if OPENSSL_VERSION_NUMBER>=0x10100000
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OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
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| OPENSSL_INIT_ADD_ALL_DIGESTS \
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| OPENSSL_INIT_LOAD_CONFIG, NULL);
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#else
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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#endif
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ERR_clear_error();
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ENGINE_load_builtin_engines();
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e = ENGINE_by_id("pkcs11");
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if (e == NULL) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (!ENGINE_ctrl_cmd_string(e, "VERBOSE", NULL, 0)) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (!ENGINE_ctrl_cmd_string(e, "MODULE_PATH", module_path, 0)) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (!ENGINE_init(e)) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (key_pass && !ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0)) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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private_key = ENGINE_load_private_key(e, private_key_name, NULL, NULL);
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if (private_key == NULL) {
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fprintf(stderr, "cannot load: %s\n", private_key_name);
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display_openssl_errors(__LINE__);
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exit(1);
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}
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public_key = ENGINE_load_public_key(e, public_key_name, NULL, NULL);
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if (public_key == NULL) {
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fprintf(stderr, "cannot load: %s\n", public_key_name);
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display_openssl_errors(__LINE__);
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exit(1);
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}
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/* Generate random data */
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data_len = sizeof(data);
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if (!RAND_bytes(data, data_len)) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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/* Encrypt the data */
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pkey_ctx = EVP_PKEY_CTX_new(public_key, e);
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if (pkey_ctx == NULL) {
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fprintf(stderr, "Could not create context\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0) {
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fprintf(stderr, "Could not init encryption\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_OAEP_PADDING) <= 0) {
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fprintf(stderr, "Could not set padding\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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enc_len = sizeof(enc);
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if (EVP_PKEY_encrypt(pkey_ctx, enc, &enc_len, data, data_len) <= 0) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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EVP_PKEY_CTX_free(pkey_ctx);
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printf("Data encrypted\n");
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/* Decrypt the data */
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pkey_ctx = EVP_PKEY_CTX_new(private_key, e);
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if (pkey_ctx == NULL) {
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fprintf(stderr, "Could not create context\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
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fprintf(stderr, "Could not init decryption\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_OAEP_PADDING) <= 0) {
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fprintf(stderr, "Could not set padding\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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/* Get the output length */
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ret = EVP_PKEY_decrypt(pkey_ctx, NULL, &dec_len, enc, enc_len);
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if (ret < 0) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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if (dec_len > sizeof(dec)){
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fprintf(stderr, "Buffer too small to hold decrypted data\n");
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exit(1);
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}
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ret = EVP_PKEY_decrypt(pkey_ctx, dec, &dec_len, enc, enc_len);
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if (ret < 0) {
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display_openssl_errors(__LINE__);
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exit(1);
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}
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EVP_PKEY_CTX_free(pkey_ctx);
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/* Compare output */
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if (!memcmp(dec, data, data_len)) {
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printf("Sucessfuly decrypted\n");
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}
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else {
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printf("Decrypted data does not match original data\n");
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display_openssl_errors(__LINE__);
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exit(1);
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}
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ENGINE_finish(e);
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CONF_modules_unload(1);
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return 0;
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}
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/* vim: set noexpandtab: */
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