e51c9fbbb8
Merge from Widevine repo of http://go/wvgerrit/121950 Remove term "Master" from "Widevine Master License Agreement". Bug: 168562298 Change-Id: I655babf1bc447f4872f6a0f849107262be42df7a
72 lines
2.3 KiB
C++
72 lines
2.3 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
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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_key_ref.h"
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#include "oemcrypto_types.h"
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#include <string.h>
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#include <vector>
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#include "log.h"
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namespace wvoec_ref {
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bool KeyControlBlock::Validate() {
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if (memcmp(verification_, "kctl", 4) && // original verification
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memcmp(verification_, "kc09", 4) && // add in version 9 api
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memcmp(verification_, "kc10", 4) && // add in version 10 api
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memcmp(verification_, "kc11", 4) && // add in version 11 api
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memcmp(verification_, "kc12", 4) && // add in version 12 api
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memcmp(verification_, "kc13", 4) && // add in version 13 api
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memcmp(verification_, "kc14", 4) && // add in version 14 api
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memcmp(verification_, "kc15", 4) && // add in version 15 api
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memcmp(verification_, "kc16", 4)) { // add in version 16 api
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LOGE("KCB: BAD verification string: %4.4s", verification_);
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valid_ = false;
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} else {
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valid_ = true;
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}
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return valid_;
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}
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// This extracts 4 bytes in network byte order to a 32 bit integer in
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// host byte order.
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uint32_t KeyControlBlock::ExtractField(const std::vector<uint8_t>& str,
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int idx) {
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int bidx = idx * 4;
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uint32_t t = static_cast<unsigned char>(str[bidx]) << 24;
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t |= static_cast<unsigned char>(str[bidx + 1]) << 16;
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t |= static_cast<unsigned char>(str[bidx + 2]) << 8;
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t |= static_cast<unsigned char>(str[bidx + 3]);
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return t;
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}
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KeyControlBlock::KeyControlBlock(
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const std::vector<uint8_t>& key_control_string) {
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if (key_control_string.size() < wvoec::KEY_CONTROL_SIZE) {
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LOGE("KCB: BAD Size: %zu (not %zu)", key_control_string.size(),
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wvoec::KEY_CONTROL_SIZE);
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return;
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}
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memcpy(verification_, &key_control_string[0], 4);
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duration_ = ExtractField(key_control_string, 1);
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nonce_ = ExtractField(key_control_string, 2);
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control_bits_ = ExtractField(key_control_string, 3);
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Validate();
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}
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void Key::UpdateDuration(const KeyControlBlock& control) {
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control_.set_duration(control.duration());
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}
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void KeyControlBlock::RequireLocalDisplay() {
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// Set all bits to require HDCP Local Display Only.
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control_bits_ |= wvoec::kControlHDCPVersionMask;
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}
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} // namespace wvoec_ref
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