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/***
This file is part of LockPassword
Copyright (C) 2020-2021 Aleksandr D. Goncharov (Joursoir) <chat@joursoir.net>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <errno.h>
#include <gpgme.h>
#include "r-gpgme.h"
#define BUF_SIZE 128
#ifdef DEBUG
#define ret_if_err(ret, err) \
do { \
if(err != GPG_ERR_NO_ERROR) { \
fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, \
__LINE__, gpgme_strsource(err), \
gpgme_strerror(err)); \
return ret; \
} \
} while(0)
#else
#define ret_if_err(ret, err) \
do { \
if(err != GPG_ERR_NO_ERROR) { \
fprintf(stderr, "%s: %s\n", \
gpgme_strsource(err), gpgme_strerror(err)); \
return ret; \
} \
} while(0)
#endif
static void init_gpgme()
{
/* The GPGME library communicates with child processes (the
crypto engines). If a child process dies unexpectedly, for
example due to a bug, or system problem, a SIGPIPE signal
will be delivered to the application. The default action is
to abort the program. To protect against this,
gpgme_check_version sets the SIGPIPE signal action to SIG_IGN
which means that the signal will be ignored. */
setlocale(LC_ALL, "");
gpgme_check_version(NULL);
gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
#ifdef LC_MESSAGES
gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
#endif
}
static int init_ctx(gpgme_ctx_t ctx, gpgme_protocol_t protocol)
{
gpgme_error_t err;
err = gpgme_engine_check_version(protocol);
ret_if_err(1, err);
err = gpgme_set_protocol(ctx, protocol);
ret_if_err(1, err);
/* output be ASCII armored */
gpgme_set_armor(ctx, 1);
return 0;
}
static int loop_read(const char *path, gpgme_data_t dh)
{
char buf[BUF_SIZE];
int ret;
FILE *f = fopen(path, "w");
if(f == NULL)
return 1;
ret = gpgme_data_seek(dh, 0, SEEK_SET);
if(ret) {
fclose(f);
ret_if_err(1, gpgme_err_code_from_errno(errno));
}
while((ret = gpgme_data_read(dh, buf, BUF_SIZE)) > 0)
fwrite(buf, ret, 1, f);
if(ret < 0) {
fclose(f);
ret_if_err(1, gpgme_err_code_from_errno(errno));
}
fclose(f);
return 0;
}
int ecnrypt_data(const char *path, const char *data, const char *pubkey)
{
gpgme_error_t err;
gpgme_ctx_t ctx;
gpgme_data_t plain, cipher;
gpgme_key_t key[] = { NULL, NULL };
init_gpgme();
err = gpgme_new(&ctx);
ret_if_err(1, err);
err = init_ctx(ctx, GPGME_PROTOCOL_OPENPGP);
ret_if_err(1, err);
/* start encrypt */
err = gpgme_data_new_from_mem(&plain, data,
sizeof(char) * (strlen(data) + 1), 0);
ret_if_err(1, err);
err = gpgme_data_new(&cipher);
ret_if_err(1, err);
err = gpgme_get_key(ctx, pubkey, &key[0], 0);
ret_if_err(1, err);
err = gpgme_op_encrypt(ctx, key, GPGME_ENCRYPT_ALWAYS_TRUST,
plain, cipher);
ret_if_err(1, err);
if(loop_read(path, cipher))
return 1;
gpgme_data_release(plain);
gpgme_data_release(cipher);
gpgme_release(ctx);
return 0;
}
char *decrypt_data(const char *path)
{
gpgme_error_t err;
gpgme_ctx_t ctx;
gpgme_data_t cipher, plain;
init_gpgme();
err = gpgme_new(&ctx);
ret_if_err(NULL, err);
err = init_ctx(ctx, GPGME_PROTOCOL_OPENPGP);
ret_if_err(NULL, err);
/* start decrypt */
err = gpgme_data_new_from_file(&cipher, path, 1);
ret_if_err(NULL, err);
err = gpgme_data_new(&plain);
ret_if_err(NULL, err);
err = gpgme_op_decrypt(ctx, cipher, plain);
ret_if_err(NULL, err);
int ret = gpgme_data_seek(plain, 0, SEEK_SET);
if(ret)
ret_if_err(NULL, gpgme_err_code_from_errno(errno));
char *data = malloc(sizeof(char) * (BUF_SIZE + 1));
gpgme_data_read(plain, data, BUF_SIZE);
gpgme_data_release(plain);
gpgme_data_release(cipher);
gpgme_release(ctx);
return data;
}
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