Fabio Alessandrelli
2feb964541
mbedTLS < 4 provides internal platform functions to seed the random number generator with entropy from the OS. Historically we have been relying on this when the mbedTLS module is enabled, while we have been using the OS::get_entropy when building without the module. Given we had issues on some platform with the built-in implementation, this commit forces the use of OS::get_entropy in all cases (module or not). This is already the case when using mbedTLS 4 (Godot 4.8+).
254 lines
9.7 KiB
C++
254 lines
9.7 KiB
C++
/**************************************************************************/
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/* crypto_core.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 "crypto_core.h"
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#include "core/os/os.h"
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#include "core/string/ustring.h"
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#include <mbedtls/aes.h>
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#include <mbedtls/base64.h>
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#include <mbedtls/ctr_drbg.h>
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#include <mbedtls/entropy.h>
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#include <mbedtls/md5.h>
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#include <mbedtls/sha1.h>
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#include <mbedtls/sha256.h>
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#if MBEDTLS_VERSION_MAJOR >= 3
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#include <mbedtls/compat-2.x.h>
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#endif
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extern "C" {
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int mbedtls_hardware_poll(void *p_data, unsigned char *r_buffer, size_t p_len, size_t *r_len) {
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*r_len = 0;
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Error err = OS::get_singleton()->get_entropy(r_buffer, p_len);
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ERR_FAIL_COND_V(err, MBEDTLS_ERR_ENTROPY_SOURCE_FAILED);
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*r_len = p_len;
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return 0;
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}
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}
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// RandomGenerator
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CryptoCore::RandomGenerator::RandomGenerator() {
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entropy = memalloc(sizeof(mbedtls_entropy_context));
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mbedtls_entropy_init((mbedtls_entropy_context *)entropy);
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ctx = memalloc(sizeof(mbedtls_ctr_drbg_context));
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mbedtls_ctr_drbg_init((mbedtls_ctr_drbg_context *)ctx);
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}
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CryptoCore::RandomGenerator::~RandomGenerator() {
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mbedtls_ctr_drbg_free((mbedtls_ctr_drbg_context *)ctx);
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memfree(ctx);
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mbedtls_entropy_free((mbedtls_entropy_context *)entropy);
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memfree(entropy);
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}
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Error CryptoCore::RandomGenerator::init() {
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int ret = mbedtls_ctr_drbg_seed((mbedtls_ctr_drbg_context *)ctx, mbedtls_entropy_func, (mbedtls_entropy_context *)entropy, nullptr, 0);
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if (ret) {
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ERR_FAIL_COND_V_MSG(ret, FAILED, vformat(" failed\n ! mbedtls_ctr_drbg_seed returned an error %d.", ret));
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}
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return OK;
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}
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Error CryptoCore::RandomGenerator::get_random_bytes(uint8_t *r_buffer, size_t p_bytes) {
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ERR_FAIL_NULL_V(ctx, ERR_UNCONFIGURED);
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int ret = mbedtls_ctr_drbg_random((mbedtls_ctr_drbg_context *)ctx, r_buffer, p_bytes);
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ERR_FAIL_COND_V_MSG(ret, FAILED, vformat(" failed\n ! mbedtls_ctr_drbg_seed returned an error %d.", ret));
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return OK;
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}
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// MD5
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CryptoCore::MD5Context::MD5Context() {
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ctx = memalloc(sizeof(mbedtls_md5_context));
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mbedtls_md5_init((mbedtls_md5_context *)ctx);
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}
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CryptoCore::MD5Context::~MD5Context() {
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mbedtls_md5_free((mbedtls_md5_context *)ctx);
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memfree((mbedtls_md5_context *)ctx);
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}
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Error CryptoCore::MD5Context::start() {
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int ret = mbedtls_md5_starts_ret((mbedtls_md5_context *)ctx);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::MD5Context::update(const uint8_t *p_src, size_t p_len) {
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int ret = mbedtls_md5_update_ret((mbedtls_md5_context *)ctx, p_src, p_len);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::MD5Context::finish(unsigned char r_hash[16]) {
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int ret = mbedtls_md5_finish_ret((mbedtls_md5_context *)ctx, r_hash);
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return ret ? FAILED : OK;
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}
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// SHA1
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CryptoCore::SHA1Context::SHA1Context() {
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ctx = memalloc(sizeof(mbedtls_sha1_context));
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mbedtls_sha1_init((mbedtls_sha1_context *)ctx);
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}
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CryptoCore::SHA1Context::~SHA1Context() {
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mbedtls_sha1_free((mbedtls_sha1_context *)ctx);
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memfree((mbedtls_sha1_context *)ctx);
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}
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Error CryptoCore::SHA1Context::start() {
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int ret = mbedtls_sha1_starts_ret((mbedtls_sha1_context *)ctx);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::SHA1Context::update(const uint8_t *p_src, size_t p_len) {
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int ret = mbedtls_sha1_update_ret((mbedtls_sha1_context *)ctx, p_src, p_len);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::SHA1Context::finish(unsigned char r_hash[20]) {
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int ret = mbedtls_sha1_finish_ret((mbedtls_sha1_context *)ctx, r_hash);
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return ret ? FAILED : OK;
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}
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// SHA256
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CryptoCore::SHA256Context::SHA256Context() {
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ctx = memalloc(sizeof(mbedtls_sha256_context));
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mbedtls_sha256_init((mbedtls_sha256_context *)ctx);
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}
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CryptoCore::SHA256Context::~SHA256Context() {
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mbedtls_sha256_free((mbedtls_sha256_context *)ctx);
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memfree((mbedtls_sha256_context *)ctx);
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}
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Error CryptoCore::SHA256Context::start() {
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int ret = mbedtls_sha256_starts_ret((mbedtls_sha256_context *)ctx, 0);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::SHA256Context::update(const uint8_t *p_src, size_t p_len) {
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int ret = mbedtls_sha256_update_ret((mbedtls_sha256_context *)ctx, p_src, p_len);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::SHA256Context::finish(unsigned char r_hash[32]) {
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int ret = mbedtls_sha256_finish_ret((mbedtls_sha256_context *)ctx, r_hash);
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return ret ? FAILED : OK;
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}
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// AES256
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CryptoCore::AESContext::AESContext() {
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ctx = memalloc(sizeof(mbedtls_aes_context));
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mbedtls_aes_init((mbedtls_aes_context *)ctx);
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}
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CryptoCore::AESContext::~AESContext() {
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mbedtls_aes_free((mbedtls_aes_context *)ctx);
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memfree((mbedtls_aes_context *)ctx);
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}
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Error CryptoCore::AESContext::set_encode_key(const uint8_t *p_key, size_t p_bits) {
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int ret = mbedtls_aes_setkey_enc((mbedtls_aes_context *)ctx, p_key, p_bits);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::set_decode_key(const uint8_t *p_key, size_t p_bits) {
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int ret = mbedtls_aes_setkey_dec((mbedtls_aes_context *)ctx, p_key, p_bits);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::encrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]) {
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int ret = mbedtls_aes_crypt_ecb((mbedtls_aes_context *)ctx, MBEDTLS_AES_ENCRYPT, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::encrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
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int ret = mbedtls_aes_crypt_cbc((mbedtls_aes_context *)ctx, MBEDTLS_AES_ENCRYPT, p_length, r_iv, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::encrypt_cfb(size_t p_length, uint8_t p_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
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size_t iv_off = 0; // Ignore and assume 16-byte alignment.
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int ret = mbedtls_aes_crypt_cfb128((mbedtls_aes_context *)ctx, MBEDTLS_AES_ENCRYPT, p_length, &iv_off, p_iv, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::decrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]) {
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int ret = mbedtls_aes_crypt_ecb((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::decrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
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int ret = mbedtls_aes_crypt_cbc((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_length, r_iv, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::AESContext::decrypt_cfb(size_t p_length, uint8_t p_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
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size_t iv_off = 0; // Ignore and assume 16-byte alignment.
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int ret = mbedtls_aes_crypt_cfb128((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_length, &iv_off, p_iv, p_src, r_dst);
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return ret ? FAILED : OK;
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}
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// CryptoCore
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String CryptoCore::b64_encode_str(const uint8_t *p_src, size_t p_src_len) {
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size_t b64len = p_src_len / 3 * 4 + 4 + 1;
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Vector<uint8_t> b64buff;
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b64buff.resize(b64len);
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uint8_t *w64 = b64buff.ptrw();
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size_t strlen = 0;
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int ret = b64_encode(&w64[0], b64len, &strlen, p_src, p_src_len);
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w64[strlen] = 0;
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return ret ? String() : (const char *)&w64[0];
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}
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Error CryptoCore::b64_encode(uint8_t *r_dst, size_t p_dst_len, size_t *r_len, const uint8_t *p_src, size_t p_src_len) {
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int ret = mbedtls_base64_encode(r_dst, p_dst_len, r_len, p_src, p_src_len);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::b64_decode(uint8_t *r_dst, size_t p_dst_len, size_t *r_len, const uint8_t *p_src, size_t p_src_len) {
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int ret = mbedtls_base64_decode(r_dst, p_dst_len, r_len, p_src, p_src_len);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::md5(const uint8_t *p_src, size_t p_src_len, unsigned char r_hash[16]) {
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int ret = mbedtls_md5_ret(p_src, p_src_len, r_hash);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::sha1(const uint8_t *p_src, size_t p_src_len, unsigned char r_hash[20]) {
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int ret = mbedtls_sha1_ret(p_src, p_src_len, r_hash);
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return ret ? FAILED : OK;
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}
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Error CryptoCore::sha256(const uint8_t *p_src, size_t p_src_len, unsigned char r_hash[32]) {
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int ret = mbedtls_sha256_ret(p_src, p_src_len, r_hash, 0);
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return ret ? FAILED : OK;
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}
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