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Happy new year to the wonderful Godot community!
2020 has been a tough year for most of us personally, but a good year for
Godot development nonetheless with a huge amount of work done towards Godot
4.0 and great improvements backported to the long-lived 3.2 branch.
We've had close to 400 contributors to engine code this year, authoring near
7,000 commit! (And that's only for the `master` branch and for the engine code,
there's a lot more when counting docs, demos and other first-party repos.)
Here's to a great year 2021 for all Godot users 🎆
115 lines
5.3 KiB
C++
115 lines
5.3 KiB
C++
/*************************************************************************/
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/* aes_context.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "core/crypto/aes_context.h"
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Error AESContext::start(Mode p_mode, PackedByteArray p_key, PackedByteArray p_iv) {
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ERR_FAIL_COND_V_MSG(mode != MODE_MAX, ERR_ALREADY_IN_USE, "AESContext already started. Call 'finish' before starting a new one.");
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ERR_FAIL_COND_V_MSG(p_mode < 0 || p_mode >= MODE_MAX, ERR_INVALID_PARAMETER, "Invalid mode requested.");
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// Key check.
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int key_bits = p_key.size() << 3;
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ERR_FAIL_COND_V_MSG(key_bits != 128 && key_bits != 256, ERR_INVALID_PARAMETER, "AES key must be either 16 or 32 bytes");
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// Initialization vector.
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if (p_mode == MODE_CBC_ENCRYPT || p_mode == MODE_CBC_DECRYPT) {
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ERR_FAIL_COND_V_MSG(p_iv.size() != 16, ERR_INVALID_PARAMETER, "The initialization vector (IV) must be exactly 16 bytes.");
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iv.resize(0);
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iv.append_array(p_iv);
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}
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// Encryption/decryption key.
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if (p_mode == MODE_CBC_ENCRYPT || p_mode == MODE_ECB_ENCRYPT) {
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ctx.set_encode_key(p_key.ptr(), key_bits);
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} else {
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ctx.set_decode_key(p_key.ptr(), key_bits);
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}
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mode = p_mode;
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return OK;
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}
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PackedByteArray AESContext::update(PackedByteArray p_src) {
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ERR_FAIL_COND_V_MSG(mode < 0 || mode >= MODE_MAX, PackedByteArray(), "AESContext not started. Call 'start' before calling 'update'.");
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int len = p_src.size();
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ERR_FAIL_COND_V_MSG(len % 16, PackedByteArray(), "The number of bytes to be encrypted must be multiple of 16. Add padding if needed");
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PackedByteArray out;
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out.resize(len);
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const uint8_t *src_ptr = p_src.ptr();
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uint8_t *out_ptr = out.ptrw();
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switch (mode) {
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case MODE_ECB_ENCRYPT: {
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for (int i = 0; i < len; i += 16) {
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Error err = ctx.encrypt_ecb(src_ptr + i, out_ptr + i);
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ERR_FAIL_COND_V(err != OK, PackedByteArray());
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}
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} break;
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case MODE_ECB_DECRYPT: {
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for (int i = 0; i < len; i += 16) {
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Error err = ctx.decrypt_ecb(src_ptr + i, out_ptr + i);
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ERR_FAIL_COND_V(err != OK, PackedByteArray());
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}
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} break;
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case MODE_CBC_ENCRYPT: {
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Error err = ctx.encrypt_cbc(len, iv.ptrw(), p_src.ptr(), out.ptrw());
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ERR_FAIL_COND_V(err != OK, PackedByteArray());
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} break;
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case MODE_CBC_DECRYPT: {
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Error err = ctx.decrypt_cbc(len, iv.ptrw(), p_src.ptr(), out.ptrw());
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ERR_FAIL_COND_V(err != OK, PackedByteArray());
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} break;
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default:
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ERR_FAIL_V_MSG(PackedByteArray(), "Bug!");
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}
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return out;
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}
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PackedByteArray AESContext::get_iv_state() {
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ERR_FAIL_COND_V_MSG(mode != MODE_CBC_ENCRYPT && mode != MODE_CBC_DECRYPT, PackedByteArray(), "Calling 'get_iv_state' only makes sense when the context is started in CBC mode.");
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PackedByteArray out;
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out.append_array(iv);
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return out;
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}
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void AESContext::finish() {
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mode = MODE_MAX;
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iv.resize(0);
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}
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void AESContext::_bind_methods() {
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ClassDB::bind_method(D_METHOD("start", "mode", "key", "iv"), &AESContext::start, DEFVAL(PackedByteArray()));
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ClassDB::bind_method(D_METHOD("update", "src"), &AESContext::update);
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ClassDB::bind_method(D_METHOD("get_iv_state"), &AESContext::get_iv_state);
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ClassDB::bind_method(D_METHOD("finish"), &AESContext::finish);
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BIND_ENUM_CONSTANT(MODE_ECB_ENCRYPT);
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BIND_ENUM_CONSTANT(MODE_ECB_DECRYPT);
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BIND_ENUM_CONSTANT(MODE_CBC_ENCRYPT);
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BIND_ENUM_CONSTANT(MODE_CBC_DECRYPT);
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BIND_ENUM_CONSTANT(MODE_MAX);
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}
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AESContext::AESContext() {
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}
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