777abaef01
(This is a merge of http://go/wvgerrit/70303) This adds a platform.h file to abstract some of the differences between Windows and POSIX platforms. This includes ntohl, setenv, and ssize_t. Bug: 122953649 Test: Android Unit Tests Change-Id: I3235f3f284b53d24d7365ff3f4a06dcd9b403697
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
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// source code may only be used and distributed under the Widevine Master
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// License Agreement.
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//
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// Reference implementation of OEMCrypto APIs
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//
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#include "oemcrypto_keybox_ref.h"
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#include <string.h>
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#include <cstdint>
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#include <string>
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#include "log.h"
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#include "oemcrypto_types.h"
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#include "platform.h"
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#include "wvcrc32.h"
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namespace wvoec_ref {
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WvKeybox::WvKeybox() : loaded_(false) {}
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KeyboxError WvKeybox::Validate() {
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if (!loaded_) {
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LOGE("[KEYBOX NOT LOADED]");
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return OTHER_ERROR;
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}
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if (strncmp(reinterpret_cast<char*>(magic_), "kbox", 4) != 0) {
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LOGE("[KEYBOX HAS BAD MAGIC]");
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return BAD_MAGIC;
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}
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uint32_t crc_computed;
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uint32_t crc_stored;
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uint8_t* crc_stored_bytes = (uint8_t*)&crc_stored;
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memcpy(crc_stored_bytes, crc_, sizeof(crc_));
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wvoec::WidevineKeybox keybox;
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memset(&keybox, 0, sizeof(keybox));
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memcpy(keybox.device_id_, &device_id_[0], device_id_.size());
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memcpy(keybox.device_key_, &device_key_[0], sizeof(keybox.device_key_));
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memcpy(keybox.data_, key_data_, sizeof(keybox.data_));
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memcpy(keybox.magic_, magic_, sizeof(keybox.magic_));
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crc_computed = ntohl(wvcrc32(reinterpret_cast<uint8_t*>(&keybox),
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sizeof(keybox) - 4)); // Drop last 4 bytes.
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if (crc_computed != crc_stored) {
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LOGE("[KEYBOX CRC problem: computed = %08x, stored = %08x]\n",
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crc_computed, crc_stored);
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return BAD_CRC;
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}
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return NO_ERROR;
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}
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bool WvKeybox::InstallKeybox(const uint8_t* buffer, size_t keyBoxLength) {
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if (keyBoxLength != 128) {
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return false;
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}
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const wvoec::WidevineKeybox* keybox =
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reinterpret_cast<const wvoec::WidevineKeybox*>(buffer);
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size_t device_id_length =
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strnlen(reinterpret_cast<const char*>(keybox->device_id_), 32);
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device_id_.assign(keybox->device_id_, keybox->device_id_ + device_id_length);
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device_key_.assign(keybox->device_key_,
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keybox->device_key_ + sizeof(keybox->device_key_));
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memcpy(key_data_, keybox->data_, sizeof(keybox->data_));
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memcpy(magic_, keybox->magic_, sizeof(keybox->magic_));
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memcpy(crc_, keybox->crc_, sizeof(keybox->crc_));
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loaded_ = true;
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return true;
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}
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} // namespace wvoec_ref
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