While I don't know the full answer, I can help continue your search. The binder implementation on the other side of mBinder is the native keystore.If I recall fully, it's behavior is to either 1) support key operations at a software level, or 2) delegate to a OEM-provided keymaster library that (presumably) interfaces to the OEM's hardware-backed keystore. Jan 28, 2015 Deal with a cracked screen on your Samsung Galaxy S4. And now some indications on the screen repairs for the Samsung Galaxy S4. How do I know if it is necessary only change the outer layer of glass? Very simple: if the phone still works perfectly responds to touch controls and not distort images, it is clear that only suffered glass screen. Jan 14, 2018  DirectUnlock has, by far, the most reliable and affordable service for an IMEI unlock on a Samsung Galaxy S4. How Does “Carrier Lock” Work? When someone buys.

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4. Could Not Generate Key In Keystore Samsung Galaxy S4 Mini Specifications
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The availability of a trusted execution environment in a system on a chip(SoC) offers an opportunity for Android devices to provide hardware-backed,strong security services to the Android OS, to platform services, and even tothird-party apps. Developers seeking the Android-specific extensions should goto android.security.keystore.

Before Android 6.0, Android already had a simple, hardware-backed cryptoservices API, provided by versions 0.2 and 0.3 of the Keymaster HardwareAbstraction Layer (HAL). Keystore provided digital signing and verificationoperations, plus generation and import of asymmetric signing key pairs. This isalready implemented on many devices, but there are many security goals thatcannot easily be achieved with only a signature API. Keystore in Android 6.0extends the Keystore API to provide a broader range of capabilities.

In Android 6.0, Keystore addedsymmetric cryptographic primitives,AES and HMAC, and an access control system for hardware-backed keys. Accesscontrols are specified during key generation and enforced for the lifetime ofthe key. Keys can be restricted to be usable only after the user hasauthenticated, and only for specified purposes or with specified cryptographicparameters. For more information, see theAuthorization Tags andFunctions pages.

In addition to expanding the range of cryptographic primitives, Keystore inAndroid 6.0 adds the following:

• A usage control scheme to allow key usage to be limited, to mitigate the risk of security compromise due to misuse of keys
• An access control scheme to enable restriction of keys to specified users, clients, and a defined time range

In Android 7.0, Keymaster 2 added support for key attestation and versionbinding. Key attestationprovides public key certificates that contain a detailed description of the keyand its access controls, to make the key's existence in secure hardware and itsconfiguration remotely verifiable.

Version bindingbinds keys to operating system and patchlevel version. This ensures that an attacker who discovers a weakness in an oldversion of system or TEE software cannot roll a device back to the vulnerableversion and use keys created with the newer version. In addition, when a keywith a given version and patch level is used on a device that has been upgradedto a newer version or patch level, the key is upgraded before it can be used,and the previous version of the key invalidated. As the device is upgraded, thekeys 'ratchet' forward along with the device, but any reversion of the device toa previous release causes the keys to be unusable.

In Android 8.0, Keymaster 3 transitioned from the old-style C-structure HardwareAbstraction Layer (HAL) to the C++ HAL interface generated from a definitionin the new Hardware Interface Definition Language (HIDL). As part of the change,many of the argument types changed, though types and methods have a one-to-onecorrespondence with the old types and the HAL struct methods. See theFunctions page for moredetails.

In addition to this interface revision, Android 8.0 extends Keymaster 2'sattestation feature to supportID attestation.ID attestation provides a limited and optional mechanism for strongly attestingto hardware identifiers, such as device serial number, product name, and phoneID (IMEI / MEID). To implement this addition, change the ASN.1 attestationschema to add ID attestation. Keymaster implementations need to find some secureway to retrieve the relevant data items, as well as to define a mechanism forsecurely and permanently disabling the feature.

In Android 9, updates include:

• Update to Keymaster 4
• Support for embedded Secure Elements
• Support for secure key import
• Support for 3DES encryption
• Changes to version binding so that boot.img and system.img have separately set versions to allow for independent updates

Glossary

Here is a quick overview of Keystore components and their relationships.

AndroidKeystore is the Android Framework API and component usedby apps to access Keystore functionality. It is implemented as an extension tothe standard Java Cryptography Architecture APIs, and consists of Java code thatruns in the app's own process space. AndroidKeystore fulfills apprequests for Keystore behavior by forwarding them to the keystore daemon.

The keystore daemon is an Android system daemon that providesaccess to all Keystore functionality via a Binder API. It's responsible for storing 'key blobs', whichcontain the actual secret key material, encrypted so Keystore can store it butnot use it or reveal it.

keymasterd is a HIDL server that provides access to theKeymaster TA. (This name is not standardized and is for conceptual purposes.)

Keymaster TA (trusted application) is the software running in asecure context, most often in TrustZone on an ARM SoC, that provides all of thesecure Keystore operations, has access to the raw key material, validates all ofthe access control conditions on keys, etc.

LockSettingsService is the Android system component responsiblefor user authentication, both password and fingerprint. It's not part ofKeystore, but relevant because many Keystore key operations require userauthentication. LockSettingsService interacts with the GatekeeperTA and Fingerprint TA to obtain authentication tokens, which it provides to thekeystore daemon, and which are ultimately consumed by the Keymaster TAapplication.

Gatekeeper TA (trusted application) is another componentrunning in the secure context, which is responsible for authenticating userpasswords and generating authentication tokens used to prove to the Keymaster TAthat an authentication was done for a particular user at a particular point intime.

Fingerprint TA (trusted application) is another componentrunning in the secure context which is responsible for authenticating userfingerprints and generating authentication tokens used to prove to the KeymasterTA that an authentication was done for a particular user at a particular pointin time.

Architecture

The Android Keystore API and the underlying Keymaster HALprovides a basic but adequate set of cryptographic primitives to allow theimplementation of protocols using access-controlled, hardware-backed keys.

The Keymaster HAL is an OEM-provided, dynamically loadable library used bythe Keystore service to provide hardware-backed cryptographic services. To keepthings secure, HAL implementations don't perform any sensitive operations inuser space, or even in kernel space. Sensitive operations are delegated to asecure processor reached through some kernel interface.The resulting architecture looks like this:

Figure 1. Access to Keymaster

Within an Android device, the 'client' of the Keymaster HAL consists ofmultiple layers (e.g. app, framework, Keystore daemon), but that can be ignoredfor the purposes of this document. This means that the described Keymaster HALAPI is low-level, used by platform-internal components, and not exposed to appdevelopers. The higher-level API is described on the Android Developer site.

The purpose of the Keymaster HAL is not to implement the security-sensitivealgorithms but only to marshal and unmarshal requests to the secure world. Thewire format is implementation-defined.

Compatibility with previousversions

The Keymaster 1 HAL is completely incompatible with thepreviously released HALs, e.g. Keymaster 0.2 and 0.3. To facilitateinteroperability on devices running Android 5.0 and earlier that launched withthe older Keymaster HALs, Keystore provides an adapter that implements theKeymaster 1 HAL with calls to the existing hardware library. The result cannotprovide the full range of functionality in the Keymaster 1 HAL. In particular,it only supports RSA and ECDSA algorithms, and all of the key authorizationenforcement is performed by the adapter, in the non-secure world.

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Keymaster 2 further simplified the HAL interface by removing theget_supported_* methods and allowing the finish()method to accept input. This reduces the number of round trips to the TEE incases where the input is available all at once, and simplifies implementation ofAEAD decryption.

In Android 8.0, Keymaster 3 transitioned from the old-style C-structureHAL to the C++ HAL interface generated from a definition in the newHardware Interface Definition Language (HIDL). A new-style HALimplementation is created by subclassing the generatedIKeymasterDevice class and implementing the pure virtualmethods. As part of the change, many of the argument types have changed,though types and methods have a one-to-one correspondence with the oldtypes and the HAL struct methods.

HIDL overview

The Hardware Interface Definition Language (HIDL) provides an implementationlanguage-independent mechanism for specifying hardware interfaces. The HIDLtooling currently supports generation of C++ and Java interfaces. It's expectedthat most Trusted Execution Environment (TEE) implementers will find the C++tooling more convenient, so this document discusses only the C++ representation.

HIDL interfaces consist of a set of methods, expressed as:

There are various pre-defined types, and HALs can define new enumerated andstructure types. For more details on HIDL, see the Reference section.

An example method from the Keymaster 3 IKeymasterDevice.hal is:

This is the equivalent of the following from the keymaster2 HAL:

In the HIDL version, the dev argument is removed, because it'simplicit. The params argument is no longer a struct containing apointer referencing an array of key_parameter_t objects, but avec (vector) containing KeyParameter objects. Thereturn values are listed in the 'generates' clause, including avector of uint8_t values for the key blob.

The C++ virtual method generated by the HIDL compiler is:

Where generate_cb is a function pointer defined as:

That is, generate_cb is a function that takes the return valueslisted in the generate clause. The HAL implementation class overrides thisgenerateKey method and calls the generate_cb functionpointer to return the result of the operation to the caller. Note the functionpointer call is synchronous. The caller callsgenerateKey and generateKey calls the suppliedfunction pointer, which executes to completion, returning control to thegenerateKey implementation, which then returns to the caller.

For a detailed example, see the default implementation inhardware/interfaces/keymaster/3.0/default/KeymasterDevice.cpp.The default implementation provides backward compatibility for devices withold-style keymaster0, keymaster1, or keymaster2 HALS.

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As a security measure, Android requires that apps be signed in order to be installed. Signing an app first requires creating keystores. A keystore is a storage mechanism for security certificates. A public key certificate is used to sign an APK before deployment to services like the Google Play Store. Signing the APK in this fashion allows Google to provide a high level of certainty that future updates to your APK of the same app come from you and not some malicious third party.

Considerations

There are some things you will need to consider before first deploying your Android app. Primary among these is the expected lifespan of your app. You will not be able to deploy the same app signed by another key at any point in the near future. Android, as well as Google Play, enforces the use of the same key for updates to an APK. If you need to sign your app with another key for any reason, you will have to deploy the app with a new package name. Any ratings your app had on Google Play will be lost. You will also lose touch with your user base unless you have notified them in some way to expect the existing app to be obsolete.

Creating keystores

After you have decided on an app’s lifespan, you’ll want to generate your keystore. Java includes a tool for just this purpose: keytool. keytool is located in your Java JDK installation and should be on your path for the purposes of this article. keytool will quickly generate a public/private key pair and store them in a keystore for you after you answer a few simple questions.

keytool has a number of commands. The most common command used for signing Android builds -genkeypair, commonly abbreviated -genkey. The other commands may be useful to you, but uncommonly so. Again, there are lots of options for this keytool command. The primary -genkey options we are concerned with are in the table below with a brief description:

In other words, running the command

keytool -genkey -v -keystore release.keystore -alias example -keyalg RSA -keysize 2048 -validity 10000

would result in a keystore file called release.keystore which contained an RSA-2048 public/private keypair by the alias name of example and validity of 10,000 days (more than 27 years).

Before running this command, you’ll want to decide on strong passwords for the keystore and key. You’ll need both of these passwords to sign an APK — they can be the same password if you’re into that kind of thing. The tool will also collect some metadata like your name and organization, but all of that is optional.

Related: Backgrounding Instead of Finishing the Root Activity on Android

Signing your APK

• Sign with Gradle

After running the command you’ll be the proud owner of a brand new Java Keystore. You probably want to set up your project to use the keystore to sign your APK, so let’s have a look at that.

If you’re using gradle to build your Android project, you will create a android.signingConfig and associate it with one or more android.buildTypes. The two passwords, keystore name, and alias name will all be needed in order to sign an APK. You can handle this in at least a few different ways. The simplest is to enter the relevant information directly into your gradle build script:

If you want to control access to the passwords you can move the information out of the build.gradle file and put it in your local environment or in a properties file to load at build time. To maintain security and control of the information, it’s likely that you would not want to check the keystore properties file into your source control.

Here is an example [from Google] of how to load the information from a file that would be located in your app’s root directory with the project level build.gradle file:

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keystore.properties would contain (in this example):

If you prefer the environment variable method, create a script to add the variables to your environment and try something like this:

There are some trade-offs to both of these methods. Figure out what works best for your organization’s methodology and use that one. For the environment variable method, for example, you have to load these variables into your environment somehow. This is less than ideal if you want to generate a signed APK with Android Studio.

• Sign manually

If you prefer to sign your APK manually instead of as part of the build process, you’ll want to use apksigner, located at {ANDROID_SDK_DIRECTORY}/build-tools/{BUILD_TOOLS_VERSION}/apksigner for build-tools revision 24.0.3 or higher. apksigner uses the public/private key pair stored in your app’s keystore to generate a public key certificate. apksigner then attaches that certificate to the APK. After this is accomplished, the APK is associated with that private key in a unique way. The Android gradle plugin will handle this for you if you configure your build.gradle file with all of the necessary information, as shown above.

You’ll want to zipalign your APK, zipalign will ensure that your app’s uncompressed data starts at a predictable offset inside the APK. zipaligned APKs are required to publish to the Google Play store.

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After your APK is zipaligned, sign it using apksigner:

You will be prompted at the command line to enter the password for your keystore.

If your keystore and key passwords differ, you’re in for a treat! Using the command above, you will be asked for the keystore password, but will not be asked for the key password. Entering either password results in exceptions and you won’t be having a good time. You’ll need to tell apksigner that you want to specify each password individually. Apparently, this is supposed to be the default behavior, but it hasn’t worked for me. To force apksigner to ask you for the keystore and key password independently, use the --ks-pass and --key-pass options. Following each option with stdin will tell apksigner to capture the password from you at the command line.

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I hope this has educated you a bit more about how creating keystores and signing an Android APK works.

Could Not Generate Key In Keystore Samsung Galaxy S4 Mini Specs

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