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diff --git a/src/examples/generate.c b/src/examples/generate.c
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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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