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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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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