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/*
* Copyright (c) 2018, [Ribose Inc](https://www.ribose.com).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <rnp/rnp.h>
#include <string.h>
#define RNP_SUCCESS 0
/* sample pass provider implementation, which always return 'password' for key decryption and
* 'encpassword' when password is needed for file decryption. You may ask for password via
* stdin, or choose password based on key properties, whatever else */
static bool
example_pass_provider(rnp_ffi_t ffi,
void * app_ctx,
rnp_key_handle_t key,
const char * pgp_context,
char buf[],
size_t buf_len)
{
if (!strcmp(pgp_context, "decrypt (symmetric)")) {
strncpy(buf, "encpassword", buf_len);
return true;
}
if (!strcmp(pgp_context, "decrypt")) {
strncpy(buf, "password", buf_len);
return true;
}
return false;
}
static int
ffi_decrypt(bool usekeys)
{
rnp_ffi_t ffi = NULL;
rnp_input_t keyfile = NULL;
rnp_input_t input = NULL;
rnp_output_t output = NULL;
uint8_t * buf = NULL;
size_t buf_len = 0;
int result = 1;
/* initialize FFI object */
if (rnp_ffi_create(&ffi, "GPG", "GPG") != RNP_SUCCESS) {
return result;
}
/* check whether we want to use key or password for decryption */
if (usekeys) {
/* load secret keyring, as it is required for public-key decryption. However, you may
* need to load public keyring as well to validate key's signatures. */
if (rnp_input_from_path(&keyfile, "secring.pgp") != RNP_SUCCESS) {
fprintf(stdout, "failed to open secring.pgp. Did you run ./generate sample?\n");
goto finish;
}
/* we may use RNP_LOAD_SAVE_SECRET_KEYS | RNP_LOAD_SAVE_PUBLIC_KEYS as well*/
if (rnp_load_keys(ffi, "GPG", keyfile, RNP_LOAD_SAVE_SECRET_KEYS) != RNP_SUCCESS) {
fprintf(stdout, "failed to read secring.pgp\n");
goto finish;
}
rnp_input_destroy(keyfile);
keyfile = NULL;
}
/* set the password provider */
rnp_ffi_set_pass_provider(ffi, example_pass_provider, NULL);
/* create file input and memory output objects for the encrypted message and decrypted
* message */
if (rnp_input_from_path(&input, "encrypted.asc") != RNP_SUCCESS) {
fprintf(stdout, "failed to create input object\n");
goto finish;
}
if (rnp_output_to_memory(&output, 0) != RNP_SUCCESS) {
fprintf(stdout, "failed to create output object\n");
goto finish;
}
if (rnp_decrypt(ffi, input, output) != RNP_SUCCESS) {
fprintf(stdout, "public-key decryption failed\n");
goto finish;
}
/* get the decrypted message from the output structure */
if (rnp_output_memory_get_buf(output, &buf, &buf_len, false) != RNP_SUCCESS) {
goto finish;
}
fprintf(stdout,
"Decrypted message (%s):\n%.*s\n",
usekeys ? "with key" : "with password",
(int) buf_len,
buf);
result = 0;
finish:
rnp_input_destroy(keyfile);
rnp_input_destroy(input);
rnp_output_destroy(output);
rnp_ffi_destroy(ffi);
return result;
}
int
main(int argc, char **argv)
{
int res;
res = ffi_decrypt(true);
if (res) {
return res;
}
res = ffi_decrypt(false);
return res;
}
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