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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 <string.h>
#include <rnp/rnp.h>
#define RNP_SUCCESS 0
/* RSA key JSON description. 31536000 = 1 year expiration, 15768000 = half year */
const char *RSA_KEY_DESC = "{\
'primary': {\
'type': 'RSA',\
'length': 2048,\
'userid': 'rsa@key',\
'expiration': 31536000,\
'usage': ['sign'],\
'protection': {\
'cipher': 'AES256',\
'hash': 'SHA256'\
}\
},\
'sub': {\
'type': 'RSA',\
'length': 2048,\
'expiration': 15768000,\
'usage': ['encrypt'],\
'protection': {\
'cipher': 'AES256',\
'hash': 'SHA256'\
}\
}\
}";
const char *CURVE_25519_KEY_DESC = "{\
'primary': {\
'type': 'EDDSA',\
'userid': '25519@key',\
'expiration': 0,\
'usage': ['sign'],\
'protection': {\
'cipher': 'AES256',\
'hash': 'SHA256'\
}\
},\
'sub': {\
'type': 'ECDH',\
'curve': 'Curve25519',\
'expiration': 15768000,\
'usage': ['encrypt'],\
'protection': {\
'cipher': 'AES256',\
'hash': 'SHA256'\
}\
}\
}";
/* basic pass provider implementation, which always return 'password' for key protection.
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, "protect")) {
return false;
}
strncpy(buf, "password", buf_len);
return true;
}
/* this simple helper function just prints armored key, searched by userid, to stdout */
static bool
ffi_print_key(rnp_ffi_t ffi, const char *uid, bool secret)
{
rnp_output_t keydata = NULL;
rnp_key_handle_t key = NULL;
uint32_t flags = RNP_KEY_EXPORT_ARMORED | RNP_KEY_EXPORT_SUBKEYS;
uint8_t * buf = NULL;
size_t buf_len = 0;
bool result = false;
/* you may search for the key via userid, keyid, fingerprint, grip */
if (rnp_locate_key(ffi, "userid", uid, &key) != RNP_SUCCESS) {
return false;
}
if (!key) {
return false;
}
/* create in-memory output structure to later use buffer */
if (rnp_output_to_memory(&keydata, 0) != RNP_SUCCESS) {
goto finish;
}
flags = flags | (secret ? RNP_KEY_EXPORT_SECRET : RNP_KEY_EXPORT_PUBLIC);
if (rnp_key_export(key, keydata, flags) != RNP_SUCCESS) {
goto finish;
}
/* get key's contents from the output structure */
if (rnp_output_memory_get_buf(keydata, &buf, &buf_len, false) != RNP_SUCCESS) {
goto finish;
}
fprintf(stdout, "%.*s", (int) buf_len, buf);
result = true;
finish:
rnp_key_handle_destroy(key);
rnp_output_destroy(keydata);
return result;
}
static bool
ffi_export_key(rnp_ffi_t ffi, const char *uid, bool secret)
{
rnp_output_t keyfile = NULL;
rnp_key_handle_t key = NULL;
uint32_t flags = RNP_KEY_EXPORT_ARMORED | RNP_KEY_EXPORT_SUBKEYS;
char filename[32] = {0};
char * keyid = NULL;
bool result = false;
/* you may search for the key via userid, keyid, fingerprint, grip */
if (rnp_locate_key(ffi, "userid", uid, &key) != RNP_SUCCESS) {
return false;
}
if (!key) {
return false;
}
/* get key's id and build filename */
if (rnp_key_get_keyid(key, &keyid) != RNP_SUCCESS) {
goto finish;
}
snprintf(filename, sizeof(filename), "key-%s-%s.asc", keyid, secret ? "sec" : "pub");
rnp_buffer_destroy(keyid);
/* create file output structure */
if (rnp_output_to_path(&keyfile, filename) != RNP_SUCCESS) {
goto finish;
}
flags = flags | (secret ? RNP_KEY_EXPORT_SECRET : RNP_KEY_EXPORT_PUBLIC);
if (rnp_key_export(key, keyfile, flags) != RNP_SUCCESS) {
goto finish;
}
result = true;
finish:
rnp_key_handle_destroy(key);
rnp_output_destroy(keyfile);
return result;
}
/* this example function generates RSA/RSA and Eddsa/X25519 keypairs */
static int
ffi_generate_keys()
{
rnp_ffi_t ffi = NULL;
rnp_output_t keyfile = NULL;
char * key_grips = NULL;
int result = 1;
/* initialize FFI object */
if (rnp_ffi_create(&ffi, "GPG", "GPG") != RNP_SUCCESS) {
return result;
}
/* set password provider */
if (rnp_ffi_set_pass_provider(ffi, example_pass_provider, NULL)) {
goto finish;
}
/* generate EDDSA/X25519 keypair */
if (rnp_generate_key_json(ffi, CURVE_25519_KEY_DESC, &key_grips) != RNP_SUCCESS) {
fprintf(stdout, "failed to generate eddsa key\n");
goto finish;
}
fprintf(stdout, "Generated 25519 key/subkey:\n%s\n", key_grips);
/* destroying key_grips buffer is our obligation */
rnp_buffer_destroy(key_grips);
key_grips = NULL;
/* generate RSA keypair */
if (rnp_generate_key_json(ffi, RSA_KEY_DESC, &key_grips) != RNP_SUCCESS) {
fprintf(stdout, "failed to generate rsa key\n");
goto finish;
}
fprintf(stdout, "Generated RSA key/subkey:\n%s\n", key_grips);
rnp_buffer_destroy(key_grips);
key_grips = NULL;
/* create file output object and save public keyring with generated keys, overwriting
* previous file if any. You may use rnp_output_to_memory() here as well. */
if (rnp_output_to_path(&keyfile, "pubring.pgp") != RNP_SUCCESS) {
fprintf(stdout, "failed to initialize pubring.pgp writing\n");
goto finish;
}
if (rnp_save_keys(ffi, "GPG", keyfile, RNP_LOAD_SAVE_PUBLIC_KEYS) != RNP_SUCCESS) {
fprintf(stdout, "failed to save pubring\n");
goto finish;
}
rnp_output_destroy(keyfile);
keyfile = NULL;
/* create file output object and save secret keyring with generated keys */
if (rnp_output_to_path(&keyfile, "secring.pgp") != RNP_SUCCESS) {
fprintf(stdout, "failed to initialize secring.pgp writing\n");
goto finish;
}
if (rnp_save_keys(ffi, "GPG", keyfile, RNP_LOAD_SAVE_SECRET_KEYS) != RNP_SUCCESS) {
fprintf(stdout, "failed to save secring\n");
goto finish;
}
rnp_output_destroy(keyfile);
keyfile = NULL;
result = 0;
finish:
rnp_buffer_destroy(key_grips);
rnp_output_destroy(keyfile);
rnp_ffi_destroy(ffi);
return result;
}
static int
ffi_output_keys()
{
rnp_ffi_t ffi = NULL;
rnp_input_t keyfile = NULL;
int result = 2;
/* initialize FFI object */
if (rnp_ffi_create(&ffi, "GPG", "GPG") != RNP_SUCCESS) {
return result;
}
/* load keyrings */
if (rnp_input_from_path(&keyfile, "pubring.pgp") != RNP_SUCCESS) {
fprintf(stdout, "failed to open pubring.pgp\n");
goto finish;
}
/* actually, we may use 0 instead of RNP_LOAD_SAVE_PUBLIC_KEYS, to not check key types */
if (rnp_load_keys(ffi, "GPG", keyfile, RNP_LOAD_SAVE_PUBLIC_KEYS) != RNP_SUCCESS) {
fprintf(stdout, "failed to read pubring.pgp\n");
goto finish;
}
rnp_input_destroy(keyfile);
keyfile = NULL;
if (rnp_input_from_path(&keyfile, "secring.pgp") != RNP_SUCCESS) {
fprintf(stdout, "failed to open secring.pgp\n");
goto finish;
}
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;
/* print armored keys to the stdout */
if (!ffi_print_key(ffi, "rsa@key", false) || !ffi_print_key(ffi, "rsa@key", true) ||
!ffi_print_key(ffi, "25519@key", false) || !ffi_print_key(ffi, "25519@key", true)) {
fprintf(stdout, "failed to print armored key(s)\n");
goto finish;
}
/* write armored keys to the files, named key-<keyid>-pub.asc/named key-<keyid>-sec.asc */
if (!ffi_export_key(ffi, "rsa@key", false) || !ffi_export_key(ffi, "rsa@key", true) ||
!ffi_export_key(ffi, "25519@key", false) || !ffi_export_key(ffi, "25519@key", true)) {
fprintf(stdout, "failed to write armored key(s) to file\n");
goto finish;
}
result = 0;
finish:
rnp_input_destroy(keyfile);
rnp_ffi_destroy(ffi);
return result;
}
int
main(int argc, char **argv)
{
int res = ffi_generate_keys();
if (res) {
return res;
}
res = ffi_output_keys();
return res;
}
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