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/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/types.h>
#include <openssl/params.h>
#include "prov/bio.h"
#include "prov/implementations.h"
#include "serializer_local.h"
static OSSL_OP_serializer_newctx_fn x25519_priv_newctx;
static OSSL_OP_serializer_newctx_fn x448_priv_newctx;
static OSSL_OP_serializer_freectx_fn ecx_priv_freectx;
static OSSL_OP_serializer_set_ctx_params_fn ecx_priv_set_ctx_params;
static OSSL_OP_serializer_settable_ctx_params_fn ecx_priv_settable_ctx_params;
static OSSL_OP_serializer_serialize_data_fn ecx_priv_der_data;
static OSSL_OP_serializer_serialize_object_fn ecx_priv_der;
static OSSL_OP_serializer_serialize_data_fn ecx_priv_pem_data;
static OSSL_OP_serializer_serialize_object_fn ecx_priv_pem;
static OSSL_OP_serializer_serialize_data_fn ecx_priv_print_data;
static OSSL_OP_serializer_serialize_object_fn ecx_priv_print;
/*
* Context used for private key serialization.
*/
struct ecx_priv_ctx_st {
void *provctx;
struct pkcs8_encrypt_ctx_st sc;
ECX_KEY_TYPE type;
};
/* Private key : context */
static void *ecx_priv_newctx(void *provctx, ECX_KEY_TYPE type)
{
struct ecx_priv_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL) {
ctx->provctx = provctx;
/* -1 is the "whatever" indicator, i.e. the PKCS8 library default PBE */
ctx->sc.pbe_nid = -1;
ctx->type = type;
}
return ctx;
}
static void *x25519_priv_newctx(void *provctx)
{
return ecx_priv_newctx(provctx, ECX_KEY_TYPE_X25519);
}
static void *x448_priv_newctx(void *provctx)
{
return ecx_priv_newctx(provctx, ECX_KEY_TYPE_X448);
}
static void ecx_priv_freectx(void *vctx)
{
struct ecx_priv_ctx_st *ctx = vctx;
EVP_CIPHER_free(ctx->sc.cipher);
OPENSSL_free(ctx->sc.cipher_pass);
OPENSSL_free(ctx);
}
static const OSSL_PARAM *ecx_priv_settable_ctx_params(void)
{
static const OSSL_PARAM settables[] = {
OSSL_PARAM_utf8_string(OSSL_SERIALIZER_PARAM_CIPHER, NULL, 0),
OSSL_PARAM_octet_string(OSSL_SERIALIZER_PARAM_PASS, NULL, 0),
OSSL_PARAM_END,
};
return settables;
}
static int ecx_priv_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
struct ecx_priv_ctx_st *ctx = vctx;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate_const(params, OSSL_SERIALIZER_PARAM_CIPHER);
if (p != NULL) {
const OSSL_PARAM *propsp =
OSSL_PARAM_locate_const(params, OSSL_SERIALIZER_PARAM_PROPERTIES);
const char *props;
if (p->data_type != OSSL_PARAM_UTF8_STRING)
return 0;
if (propsp != NULL && propsp->data_type != OSSL_PARAM_UTF8_STRING)
return 0;
props = (propsp != NULL ? propsp->data : NULL);
EVP_CIPHER_free(ctx->sc.cipher);
ctx->sc.cipher_intent = p->data != NULL;
if (p->data != NULL
&& ((ctx->sc.cipher = EVP_CIPHER_fetch(NULL, p->data, props))
== NULL))
return 0;
}
p = OSSL_PARAM_locate_const(params, OSSL_SERIALIZER_PARAM_PASS);
if (p != NULL) {
OPENSSL_free(ctx->sc.cipher_pass);
ctx->sc.cipher_pass = NULL;
if (!OSSL_PARAM_get_octet_string(p, &ctx->sc.cipher_pass, 0,
&ctx->sc.cipher_pass_length))
return 0;
}
return 1;
}
/* Private key : DER */
static int ecx_priv_der_data(void *vctx, const OSSL_PARAM params[], BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
struct ecx_priv_ctx_st *ctx = vctx;
OSSL_OP_keymgmt_new_fn *ecx_new;
OSSL_OP_keymgmt_free_fn *ecx_free;
OSSL_OP_keymgmt_import_fn *ecx_import;
int ok = 0;
ecx_get_new_free_import(ctx->type, &ecx_new, &ecx_free, &ecx_import);
if (ecx_import != NULL) {
ECX_KEY *ecxkey;
if ((ecxkey = ecx_new(ctx->provctx)) != NULL
&& ecx_import(ecxkey, OSSL_KEYMGMT_SELECT_KEYPAIR, params)
&& ecx_priv_der(ctx, ecxkey, out, cb, cbarg))
ok = 1;
ecx_free(ecxkey);
}
return ok;
}
static int ecx_priv_der(void *vctx, void *vecxkey, BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
struct ecx_priv_ctx_st *ctx = vctx;
ECX_KEY *ecxkey = vecxkey;
int ret;
int type = (ctx->type == ECX_KEY_TYPE_X25519) ? EVP_PKEY_X25519
: EVP_PKEY_X448;
ctx->sc.cb = cb;
ctx->sc.cbarg = cbarg;
ret = ossl_prov_write_priv_der_from_obj(out, ecxkey,
type,
NULL,
ossl_prov_ecx_priv_to_der,
&ctx->sc);
return ret;
}
/* Private key : PEM */
static int ecx_priv_pem_data(void *vctx, const OSSL_PARAM params[], BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
struct ecx_priv_ctx_st *ctx = vctx;
OSSL_OP_keymgmt_new_fn *ecx_new;
OSSL_OP_keymgmt_free_fn *ecx_free;
OSSL_OP_keymgmt_import_fn *ecx_import;
int ok = 0;
ecx_get_new_free_import(ctx->type, &ecx_new, &ecx_free, &ecx_import);
if (ecx_import != NULL) {
ECX_KEY *ecxkey;
if ((ecxkey = ecx_new(ctx->provctx)) != NULL
&& ecx_import(ecxkey, OSSL_KEYMGMT_SELECT_KEYPAIR, params)
&& ecx_priv_pem(ctx->provctx, ecxkey, out, cb, cbarg))
ok = 1;
ecx_free(ecxkey);
}
return ok;
}
static int ecx_priv_pem(void *vctx, void *ecxkey, BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
struct ecx_priv_ctx_st *ctx = vctx;
int ret;
int type = (ctx->type == ECX_KEY_TYPE_X25519) ? EVP_PKEY_X25519
: EVP_PKEY_X448;
ctx->sc.cb = cb;
ctx->sc.cbarg = cbarg;
ret = ossl_prov_write_priv_pem_from_obj(out, ecxkey,
type,
NULL,
ossl_prov_ecx_priv_to_der,
&ctx->sc);
return ret;
}
static int ecx_priv_print_data(void *vctx, const OSSL_PARAM params[], BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
struct ecx_priv_ctx_st *ctx = vctx;
OSSL_OP_keymgmt_new_fn *ecx_new;
OSSL_OP_keymgmt_free_fn *ecx_free;
OSSL_OP_keymgmt_import_fn *ecx_import;
int ok = 0;
ecx_get_new_free_import(ctx->type, &ecx_new, &ecx_free, &ecx_import);
if (ecx_import != NULL) {
ECX_KEY *ecxkey;
if ((ecxkey = ecx_new(ctx->provctx)) != NULL
&& ecx_import(ecxkey, OSSL_KEYMGMT_SELECT_KEYPAIR, params)
&& ecx_priv_print(ctx, ecxkey, out, cb, cbarg))
ok = 1;
ecx_free(ecxkey);
}
return ok;
}
static int ecx_priv_print(void *ctx, void *ecxkey, BIO *out,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
return ossl_prov_print_ecx(out, ecxkey, ecx_print_priv);
}
#define MAKE_SERIALIZER_FUNCTIONS(alg, type) \
const OSSL_DISPATCH alg##_priv_##type##_serializer_functions[] = { \
{ OSSL_FUNC_SERIALIZER_NEWCTX, (void (*)(void))alg##_priv_newctx }, \
{ OSSL_FUNC_SERIALIZER_FREECTX, (void (*)(void))ecx_priv_freectx }, \
{ OSSL_FUNC_SERIALIZER_SET_CTX_PARAMS, \
(void (*)(void))ecx_priv_set_ctx_params }, \
{ OSSL_FUNC_SERIALIZER_SETTABLE_CTX_PARAMS, \
(void (*)(void))ecx_priv_settable_ctx_params }, \
{ OSSL_FUNC_SERIALIZER_SERIALIZE_DATA, \
(void (*)(void))ecx_priv_##type##_data }, \
{ OSSL_FUNC_SERIALIZER_SERIALIZE_OBJECT, \
(void (*)(void))ecx_priv_##type }, \
{ 0, NULL } \
};
#define MAKE_SERIALIZER_FUNCTIONS_GROUP(alg) \
MAKE_SERIALIZER_FUNCTIONS(alg, der) \
MAKE_SERIALIZER_FUNCTIONS(alg, pem) \
const OSSL_DISPATCH alg##_priv_print_serializer_functions[] = { \
{ OSSL_FUNC_SERIALIZER_NEWCTX, (void (*)(void))alg##_priv_newctx }, \
{ OSSL_FUNC_SERIALIZER_FREECTX, (void (*)(void))ecx_priv_freectx }, \
{ OSSL_FUNC_SERIALIZER_SERIALIZE_OBJECT, \
(void (*)(void))ecx_priv_print }, \
{ OSSL_FUNC_SERIALIZER_SERIALIZE_DATA, \
(void (*)(void))ecx_priv_print_data }, \
{ 0, NULL } \
};
MAKE_SERIALIZER_FUNCTIONS_GROUP(x25519)
MAKE_SERIALIZER_FUNCTIONS_GROUP(x448)
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