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Fang Yu
2018-10-01 14:59:29 -07:00
parent 5bdf48b400
commit ba0d63e2c1
110 changed files with 14079 additions and 0 deletions
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media_cas_packager_sdk/public/BUILD Normal file
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################################################################################
# Copyright 2018 Google LLC.
#
# This software is licensed under the terms defined in the Widevine Master
# License Agreement. For a copy of this agreement, please contact
# widevine-licensing@google.com.
################################################################################
# Build file for ECM SDK.
package(
default_visibility = ["//visibility:public"],
)
# Defines the common copts for cc_library targets. The main option here is
# -fvisibility=default, which exports symbols from the public APIs in the shared
# library.
# Note that the shared library should be built with -fvisibility=hidden.
PUBLIC_COPTS = ["-fvisibility=default"]
filegroup(
name = "binary_release_files",
srcs = glob(["*.h"]),
)
cc_binary(
name = "libmedia_cas_packager_sdk.so",
linkshared = 1,
deps = [":ecm_generator"],
)
cc_library(
name = "libmedia_cas_packager_sdk",
srcs = [":libmedia_cas_packager_sdk.so"],
hdrs = glob(["*.h"]),
deps = [
"//base",
"@abseil_repo//absl/base:core_headers",
"//util:status",
"//media_cas_packager_sdk/internal:ecm",
],
)
cc_library(
name = "ecm_generator",
srcs = ["ecm_generator.cc"],
hdrs = ["ecm_generator.h"],
copts = PUBLIC_COPTS,
deps = [
"//base",
"@abseil_repo//absl/base:core_headers",
"//util:status",
"//media_cas_packager_sdk/internal:ecm",
],
)
cc_test(
name = "ecm_generator_test",
size = "small",
srcs = ["ecm_generator_test.cc"],
deps = [
":ecm_generator",
"//testing:gunit_main",
"@abseil_repo//absl/memory",
"//common:aes_cbc_util",
"//protos/public:media_cas_encryption_proto",
],
)

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media_cas_packager_sdk/public/ecm_generator.cc Normal file
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////////////////////////////////////////////////////////////////////////////////
// Copyright 2018 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////
#include "media_cas_packager_sdk/public/ecm_generator.h"
#include "glog/logging.h"
namespace widevine {
namespace cas {
static constexpr int kKeyDataSize = 16;
static constexpr int kKeyIvSize8 = 8;
static constexpr int kKeyIvSize16 = 16;
static constexpr int kMaxBytesKeyIdField = 16;
std::string CasEcmGenerator::GenerateEcm(const EcmParameters& params) {
std::vector<EntitledKeyInfo> keys;
util::Status status = ProcessEcmParameters(params, &keys);
if (!status.ok() || !initialized_) {
LOG(ERROR) << " EcmParameters is not set up properly: " << status;
return "";
}
std::string serialized_ecm;
uint32_t generation;
// TODO(user): need track_type
std::string track_type = "SD";
if (params.rotation_enabled) {
status = ecm_->GenerateEcm(&keys[0], &keys[1], track_type, &serialized_ecm,
&generation);
} else {
status = ecm_->GenerateSingleKeyEcm(&keys[0], track_type, &serialized_ecm,
&generation);
}
if (!status.ok()) {
LOG(ERROR) << " Call to CasEcm's ECM Generator failed: " << status;
return "";
}
return serialized_ecm;
}
util::Status CasEcmGenerator::ProcessEcmParameters(
const EcmParameters& ecm_params, std::vector<EntitledKeyInfo>* keys) {
initialized_ = false;
rotation_enabled_ = ecm_params.rotation_enabled;
// Validate and add key data
keys->clear();
uint32_t keys_needed = ecm_params.rotation_enabled ? 2 : 1;
if (ecm_params.key_params.size() < keys_needed) {
return {util::error::INVALID_ARGUMENT,
"Number of supplied keys is wrong (check rotation periods)."};
}
for (int i = 0; i < keys_needed; i++) {
keys->emplace_back(EntitledKeyInfo());
EntitledKeyInfo& key = keys->back();
key.key_id = ecm_params.key_params[i].key_id;
key.key_value = ecm_params.key_params[i].key_data;
key.content_iv = ecm_params.key_params[i].content_ivs[0];
}
current_key_index_ = 0;
current_key_even_ = true;
initialized_ = true;
return util::OkStatus();
}
util::Status CasEcmGenerator::ValidateKeyId(const std::string& id) {
if (id.empty()) {
return {util::error::INVALID_ARGUMENT, "Key id is empty."};
}
if (id.size() > kMaxBytesKeyIdField) {
return {util::error::INVALID_ARGUMENT, "Key id is too long."};
}
return util::OkStatus();
}
util::Status CasEcmGenerator::ValidateKeyData(const std::string& key_data) {
if (key_data.empty()) {
return {util::error::INVALID_ARGUMENT, "Key data is empty."};
}
if (key_data.size() != kKeyDataSize) {
return {util::error::INVALID_ARGUMENT, "Key data is wrong size."};
}
return util::OkStatus();
}
util::Status CasEcmGenerator::ValidateIv(const std::string& iv,
size_t required_size) {
if (iv.empty()) {
return {util::error::INVALID_ARGUMENT, "IV is empty."};
}
if (required_size != 8 && required_size != 16) {
return {util::error::INTERNAL, "IV size has not been set up correctly."};
}
if (iv.size() != required_size) {
return {util::error::INVALID_ARGUMENT,
"IV has wrong or inconsistent size."};
}
return util::OkStatus();
}
util::Status CasEcmGenerator::ValidateWrappedKeyIv(const std::string& iv) {
// All wrapped key IVs must be 16 bytes.
util::Status status = ValidateIv(iv, kIvSize16);
if (!status.ok()) {
LOG(ERROR) << " Wrapped key IV is not valid: " << status;
}
return status;
}
util::Status CasEcmGenerator::ValidateContentIv(const std::string& iv) {
// If content_iv_size_ is zero, use this IV as the size for all future IVs in
// this stream.
if (content_iv_size_ == 0) {
content_iv_size_ = iv.size();
}
util::Status status = ValidateIv(iv, content_iv_size_);
if (!status.ok()) {
LOG(ERROR) << " Content IV is not valid: " << status;
}
return status;
}
util::Status CasEcmGenerator::ValidateKeyParameters(
const KeyParameters& key_params) {
util::Status status;
status = ValidateKeyId(key_params.key_id);
if (!status.ok()) return status;
status = ValidateKeyData(key_params.wrapped_key_data);
if (!status.ok()) return status;
status = ValidateWrappedKeyIv(key_params.wrapped_key_iv);
if (!status.ok()) return status;
if (key_params.content_ivs.empty()) {
return {util::error::INVALID_ARGUMENT, "Content IVs is empty."};
}
for (int i = 0; i < key_params.content_ivs.size(); i++) {
status = ValidateContentIv(key_params.content_ivs[i]);
if (!status.ok()) return status;
}
return util::OkStatus();
}
} // namespace cas
} // namespace widevine

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media_cas_packager_sdk/public/ecm_generator.h Normal file
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////////////////////////////////////////////////////////////////////////////////
// Copyright 2018 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////
#ifndef MEDIA_CAS_PACKAGER_SDK_PUBLIC_ECM_GENERATOR_H_
#define MEDIA_CAS_PACKAGER_SDK_PUBLIC_ECM_GENERATOR_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include <cstdint>
#include "util/status.h"
#include "media_cas_packager_sdk/internal/ecm.h"
namespace widevine {
namespace cas {
// KeyParameters carries key information for a single encryption key.
// Instances of this struct are owned by an EcmParameters struct.
struct KeyParameters {
std::string key_id;
std::string key_data;
std::string wrapped_key_data;
std::string wrapped_key_iv;
std::vector<std::string> content_ivs;
};
// EcmParameters holds information that is needed by the EcmGenerator. It is
// partially set up with data from a KeyGenerator (obtained via GenerateKey()).
// IVs are added later.
// TODO(user): may need a starting crypto period index.
struct EcmParameters {
static constexpr int kDefaultIVSize = 8;
int iv_size = kDefaultIVSize;
bool current_key_even = true;
uint32_t current_key_index = 0;
std::string entitlement_key_id;
bool rotation_enabled = true;
uint32_t rotation_periods;
std::vector<KeyParameters> key_params;
uint16_t program_id;
uint64_t rotation_period_microseconds;
// For video, this is zero. For audio, this is the size of the audio frame,
// which is a constant in the audio track.
uint16_t offset = 0;
};
// ECM Generator for Widevine/MediaCAS entitled keys.
class CasEcmGenerator {
public:
CasEcmGenerator() = default;
virtual ~CasEcmGenerator() = default;
virtual std::string GenerateEcm(const EcmParameters& params);
// Query the state of this ECM Generator
bool initialized() { return initialized_; }
bool rotation_enabled() { return rotation_enabled_; }
void set_ecm(std::unique_ptr<CasEcm> ecm) { ecm_ = std::move(ecm); }
private:
friend class CasEcmGeneratorTest;
util::Status ProcessEcmParameters(const EcmParameters& ecm_params,
std::vector<EntitledKeyInfo>* keys);
util::Status ProcessEcmParameters(const EcmParameters& ecm_params);
util::Status ValidateKeyId(const std::string& id);
util::Status ValidateKeyData(const std::string& key_data);
util::Status ValidateWrappedKeyIv(const std::string& iv);
util::Status ValidateIv(const std::string& iv, size_t required_size);
util::Status ValidateContentIv(const std::string& iv);
util::Status ValidateKeyParameters(const KeyParameters& key_params);
bool initialized_ = false;
uint32_t generation_ = 0;
bool rotation_enabled_ = false;
uint32_t current_key_index_ = 0;
bool current_key_even_ = true;
uint32_t content_iv_size_ = 0;
std::unique_ptr<CasEcm> ecm_;
};
} // namespace cas
} // namespace widevine
#endif // MEDIA_CAS_PACKAGER_SDK_PUBLIC_ECM_GENERATOR_H_

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////////////////////////////////////////////////////////////////////////////////
// Copyright 2018 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////
#include "media_cas_packager_sdk/public/ecm_generator.h"
#include <memory>
#include <string>
#include "testing/gmock.h"
#include "testing/gunit.h"
#include "absl/memory/memory.h"
#include "common/aes_cbc_util.h"
#include "protos/public/media_cas_encryption.pb.h"
namespace widevine {
namespace cas {
namespace {
constexpr char kCADescriptor[] = "TestCa";
constexpr char kEcm[] = "TestEcm";
constexpr char kProvider[] = "Gfiber";
constexpr char kContentId[] = "TestContent";
constexpr int kDefaultKeyRotationPeriodMilliseconds = 30 * 60 * 1000;
constexpr char kPsshData[] = "TestPsshData";
constexpr char kEntitlementKeySingle[] = "testEKId12345678";
constexpr char kEntitlementKeyDouble[] = "testEKIdabcdefgh";
constexpr char kEcmKeyIdSingle[] = "key-id-One123456";
constexpr char kEcmKeyDataSingle[] = "0123456701234567";
constexpr char kEcmWrappedKeySingle[] = "1234567890123456";
constexpr char kEcmWrappedKeyIvSingle[] = "abcdefghacbdefgh";
constexpr char kEcmContentIvSingle[] = "ABCDEFGH";
constexpr char kEcmKeyIdEven[] = "key-Id-One123456";
constexpr char kEcmKeyDataEven[] = "KKEEYYDDAATTAAee";
constexpr char kEcmWrappedKeyEven[] = "1234567890123456";
constexpr char kEcmWrappedKeyIvEven[] = "abcdefghacbdefgh";
constexpr char kEcmContentIvEven[] = "ABCDEFGH";
constexpr char kEcmKeyIdOdd[] = "key-Id-Two456789";
constexpr char kEcmKeyDataOdd[] = "kkeeyyddaattaaOO";
constexpr char kEcmWrappedKeyOdd[] = "9876543210654321";
constexpr char kEcmWrappedKeyIvOdd[] = "a1c2e3g4a1c2e3g4";
constexpr char kEcmContentIvOdd[] = "AaCbEcGd";
constexpr char kFakeCasEncryptionResponseKeyId[] = "fake_key_id.....";
constexpr char kFakeCasEncryptionResponseKeyData[] =
"fakefakefakefakefakefakefakefake";
util::Status HandleCasEncryptionRequest(const std::string& request_string,
std::string* signed_response_string) {
CasEncryptionRequest request;
request.ParseFromString(request_string);
CasEncryptionResponse response;
response.set_status(CasEncryptionResponse_Status_OK);
response.set_content_id(request.content_id());
for (const auto& track_type : request.track_types()) {
if (request.key_rotation()) {
// Add the Even key.
auto key = response.add_entitlement_keys();
key->set_key_id(kFakeCasEncryptionResponseKeyId);
key->set_key(kFakeCasEncryptionResponseKeyData);
key->set_track_type(track_type);
key->set_key_slot(CasEncryptionResponse_KeyInfo_KeySlot_EVEN);
// Add the Odd key.
key = response.add_entitlement_keys();
key->set_key_id(kFakeCasEncryptionResponseKeyId);
key->set_key(kFakeCasEncryptionResponseKeyData);
key->set_track_type(track_type);
key->set_key_slot(CasEncryptionResponse_KeyInfo_KeySlot_ODD);
} else {
auto key = response.add_entitlement_keys();
key->set_key_id(kFakeCasEncryptionResponseKeyId);
key->set_key(kFakeCasEncryptionResponseKeyData);
key->set_track_type(track_type);
key->set_key_slot(CasEncryptionResponse_KeyInfo_KeySlot_SINGLE);
}
}
std::string response_string;
response.SerializeToString(&response_string);
SignedCasEncryptionResponse signed_response;
signed_response.set_response(response_string);
signed_response.SerializeToString(signed_response_string);
return util::OkStatus();
}
} // namespace
class CasEcmGeneratorTest : public testing::Test {
protected:
void SetUp() override {
}
util::Status ProcessEcmParameters(const EcmParameters& params,
std::vector<EntitledKeyInfo>* keys) {
return ecm_gen_.ProcessEcmParameters(params, keys);
}
int EntitlementKeySize(const EcmParameters& params) const {
return params.entitlement_key_id.size();
}
void SetTestConfig1(EcmParameters* params) {
params->entitlement_key_id = kEntitlementKeySingle;
params->rotation_enabled = false;
params->key_params.push_back(kKeyParamsSingle);
}
void SetTestConfig2(EcmParameters* params) {
KeyParameters even_key_params;
KeyParameters odd_key_params;
params->entitlement_key_id = kEntitlementKeyDouble;
params->rotation_enabled = true;
params->rotation_periods = 2;
params->key_params.push_back(kKeyParamsEven);
params->key_params.push_back(kKeyParamsOdd);
}
// Call this to setup the guts (CasEcm) of the ECM Generator.
void PrepareEcmGenerator(bool key_rotation_enabled) {
ecm_ = absl::make_unique<CasEcm>();
std::string entitlement_request;
std::string entitlement_response;
ecm_init_params_.key_rotation_enabled = key_rotation_enabled;
ecm_init_params_.track_types.push_back("SD");
ASSERT_OK(ecm_->Initialize(kContentId, kProvider, ecm_init_params_,
&entitlement_request));
ASSERT_OK(
HandleCasEncryptionRequest(entitlement_request, &entitlement_response));
ASSERT_OK(ecm_->ProcessCasEncryptionResponse(entitlement_response));
ecm_gen_.set_ecm(std::move(ecm_));
}
const KeyParameters kKeyParamsSingle{kEcmKeyIdSingle,
kEcmKeyDataSingle,
kEcmWrappedKeySingle,
kEcmWrappedKeyIvSingle,
{kEcmContentIvSingle}};
const KeyParameters kKeyParamsEven{kEcmKeyIdEven,
kEcmKeyDataEven,
kEcmWrappedKeyEven,
kEcmWrappedKeyIvEven,
{kEcmContentIvEven}};
const KeyParameters kKeyParamsOdd{kEcmKeyIdOdd,
kEcmKeyDataOdd,
kEcmWrappedKeyOdd,
kEcmWrappedKeyIvOdd,
{kEcmContentIvOdd}};
std::unique_ptr<CasEcm> ecm_;
EcmInitParameters ecm_init_params_;
CasEcmGenerator ecm_gen_;
};
TEST_F(CasEcmGeneratorTest, InitializeNoRotation) {
EXPECT_FALSE(ecm_gen_.initialized());
PrepareEcmGenerator(false);
EcmParameters ecm_params;
std::vector<EntitledKeyInfo> keys;
SetTestConfig1(&ecm_params);
util::Status status = ProcessEcmParameters(ecm_params, &keys);
ASSERT_OK(status);
ASSERT_EQ(EntitlementKeySize(ecm_params), 16);
ASSERT_TRUE(ecm_gen_.initialized());
EXPECT_FALSE(ecm_gen_.rotation_enabled());
}
TEST_F(CasEcmGeneratorTest, GenerateNoRotation) {
PrepareEcmGenerator(false);
EcmParameters ecm_params;
SetTestConfig1(&ecm_params);
std::string ecm_string = ecm_gen_.GenerateEcm(ecm_params);
// Expected size (bytes):
// CA system ID: 2 bytes
// version: 1 byte
// generation + flags: 1 byte
// flags: 1 byte
// entitlement key ID: 16 bytes
// Single key: ID (16), Data (16), IV (16), IV (8) = 56
// total = 77
ASSERT_EQ(77, ecm_string.size());
EXPECT_EQ('\x4A', ecm_string[0]); // CA System ID first byte.
EXPECT_EQ('\xD4', ecm_string[1]); // CA System ID second byte.
EXPECT_EQ('\x01', ecm_string[2]); // ECM version
EXPECT_EQ('\x02', ecm_string[3]); // generation + flags
EXPECT_EQ('\x80', ecm_string[4]); // flags
EXPECT_EQ(kFakeCasEncryptionResponseKeyId, ecm_string.substr(5, 16));
EXPECT_EQ(kEcmKeyIdSingle, ecm_string.substr(21, 16));
EXPECT_NE(kEcmWrappedKeySingle, ecm_string.substr(37, 16));
EXPECT_NE(kEcmWrappedKeyIvSingle, ecm_string.substr(53, 16));
// Unwrap key and compare with original.
std::string wrapping_key = kFakeCasEncryptionResponseKeyData;
std::string wrapping_iv = ecm_string.substr(53, 16);
std::string wrapped_key = ecm_string.substr(37, 16);
std::string unwrapped_key =
crypto_util::DecryptAesCbcNoPad(wrapping_key, wrapping_iv, wrapped_key);
EXPECT_EQ(kEcmKeyDataSingle, unwrapped_key);
EXPECT_EQ(kEcmContentIvSingle, ecm_string.substr(69, 8));
}
TEST_F(CasEcmGeneratorTest, Generate2NoRotation) {
PrepareEcmGenerator(false);
EcmParameters ecm_params;
SetTestConfig1(&ecm_params);
std::string ecm_string = ecm_gen_.GenerateEcm(ecm_params);
ecm_string = ecm_gen_.GenerateEcm(ecm_params);
// Second generate should have higher generation number.
ASSERT_EQ(77, ecm_string.size());
EXPECT_EQ('\x4A', ecm_string[0]); // CA System ID first byte.
EXPECT_EQ('\xD4', ecm_string[1]); // CA System ID second byte.
EXPECT_EQ('\x01', ecm_string[2]); // ECM version
EXPECT_EQ('\x0A', ecm_string[3]); // generation + flags
EXPECT_EQ('\x80', ecm_string[4]); // flags
EXPECT_EQ(kFakeCasEncryptionResponseKeyId, ecm_string.substr(5, 16));
EXPECT_EQ(kEcmKeyIdSingle, ecm_string.substr(21, 16));
EXPECT_NE(kEcmWrappedKeySingle, ecm_string.substr(37, 16));
EXPECT_NE(kEcmWrappedKeyIvSingle, ecm_string.substr(53, 16));
// Unwrap key and compare with original.
std::string wrapping_key = kFakeCasEncryptionResponseKeyData;
std::string wrapping_iv = ecm_string.substr(53, 16);
std::string wrapped_key = ecm_string.substr(37, 16);
std::string unwrapped_key =
crypto_util::DecryptAesCbcNoPad(wrapping_key, wrapping_iv, wrapped_key);
EXPECT_EQ(kEcmKeyDataSingle, unwrapped_key);
EXPECT_EQ(kEcmContentIvSingle, ecm_string.substr(69, 8));
}
TEST_F(CasEcmGeneratorTest, InitializeSimpleRotation) {
EXPECT_FALSE(ecm_gen_.initialized());
EcmParameters ecm_params;
std::vector<EntitledKeyInfo> keys;
PrepareEcmGenerator(true);
SetTestConfig2(&ecm_params);
ecm_init_params_.key_rotation_enabled = true;
util::Status status = ProcessEcmParameters(ecm_params, &keys);
EXPECT_TRUE(status.ok());
EXPECT_TRUE(ecm_gen_.initialized());
EXPECT_TRUE(ecm_gen_.rotation_enabled());
}
TEST_F(CasEcmGeneratorTest, GenerateSimpleRotation) {
EcmParameters ecm_params;
PrepareEcmGenerator(true);
SetTestConfig2(&ecm_params);
std::string ecm_string = ecm_gen_.GenerateEcm(ecm_params);
// Expected size (bytes):
// same as no rotation case = 77
// second entitlement key ID: 16 bytes
// Second key: ID (16), Data (16), IV (16), IV (8) = 56
// total = 149
ASSERT_EQ(149, ecm_string.size());
EXPECT_EQ('\x4A', ecm_string[0]); // CA System ID first byte.
EXPECT_EQ('\xD4', ecm_string[1]); // CA System ID second byte.
EXPECT_EQ('\x01', ecm_string[2]); // ECM version
EXPECT_EQ('\x03', ecm_string[3]); // generation + flags
EXPECT_EQ('\x80', ecm_string[4]); // flags
EXPECT_EQ(kFakeCasEncryptionResponseKeyId, ecm_string.substr(5, 16));
EXPECT_EQ(kEcmKeyIdEven, ecm_string.substr(21, 16));
EXPECT_NE(kEcmWrappedKeyEven, ecm_string.substr(37, 16));
EXPECT_NE(kEcmWrappedKeyIvEven, ecm_string.substr(53, 16));
EXPECT_EQ(kEcmContentIvEven, ecm_string.substr(69, 8));
EXPECT_EQ(kFakeCasEncryptionResponseKeyId, ecm_string.substr(77, 16));
EXPECT_EQ(kEcmKeyIdOdd, ecm_string.substr(93, 16));
EXPECT_NE(kEcmWrappedKeyOdd, ecm_string.substr(109, 16));
EXPECT_NE(kEcmWrappedKeyIvOdd, ecm_string.substr(125, 16));
EXPECT_EQ(kEcmContentIvOdd, ecm_string.substr(141, 8));
// Unwrap even key and compare with original.
std::string wrapping_key_even = kFakeCasEncryptionResponseKeyData;
std::string wrapping_iv_even = ecm_string.substr(53, 16);
std::string wrapped_key_even = ecm_string.substr(37, 16);
std::string unwrapped_key_even = crypto_util::DecryptAesCbcNoPad(
wrapping_key_even, wrapping_iv_even, wrapped_key_even);
EXPECT_EQ(kEcmKeyDataEven, unwrapped_key_even);
// Unwrap odd key and compare with original.
std::string wrapping_key_odd = kFakeCasEncryptionResponseKeyData;
std::string wrapping_iv_odd = ecm_string.substr(125, 16);
std::string wrapped_key_odd = ecm_string.substr(109, 16);
std::string unwrapped_key_odd = crypto_util::DecryptAesCbcNoPad(
wrapping_key_odd, wrapping_iv_odd, wrapped_key_odd);
EXPECT_EQ(kEcmKeyDataOdd, unwrapped_key_odd);
}
} // namespace cas
} // namespace widevine