# Checksum
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
# Checksum
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/android/content/pm/Checksum "View this page in Java")
```
class Checksum : Parcelable
```
|---|------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||
| ↳ | [android.content.pm.Checksum](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#) |
A typed checksum.
## Summary
| Constants ||
|----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256:kotlin.Int) Root SHA256 hash of a 1M Merkle tree computed over protected content. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512:kotlin.Int) Root SHA512 hash of a 1M Merkle tree computed over protected content. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_WHOLE_MD5](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MD5:kotlin.Int) MD5 hash computed over all file bytes. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int) Root SHA256 hash of a 4K Merkle tree computed over all file bytes. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_WHOLE_SHA1](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA1:kotlin.Int) SHA1 hash computed over all file bytes. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_WHOLE_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA256:kotlin.Int) SHA256 hash computed over all file bytes. |
| static[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [TYPE_WHOLE_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA512:kotlin.Int) SHA512 hash computed over all file bytes. |
| Inherited constants ||
|---|---|
| From class[Parcelable](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#) |----------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [CONTENTS_FILE_DESCRIPTOR](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#CONTENTS_FILE_DESCRIPTOR:kotlin.Int)
Descriptor bit used with[describeContents()](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#describeContents()): indicates that the Parcelable object's flattened representation includes a file descriptor.
| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int)
Flag for use with[writeToParcel](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#writeToParcel(android.os.Parcel,%20kotlin.Int)): the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`". Some implementations may want to release resources at this point.
| ||
| Public constructors ||
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| [Checksum](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#Checksum(kotlin.Int,%20kotlin.ByteArray))`(`type:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `value:` `[ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html)`)` Creates a new Checksum. |
| Public methods ||
|-----------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [describeContents](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#describeContents())`()`
|
| [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [getType](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#getType())`()` Checksum type. |
| [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html) | [getValue](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#getValue())`()` Checksum value. |
| [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [writeToParcel](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#writeToParcel(android.os.Parcel,%20kotlin.Int))`(`dest:` `[Parcel](https://developer.android.com/reference/kotlin/android/os/Parcel.html#)`, `flags:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Flatten this object in to a Parcel. |
| Properties ||
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------|
| static[Parcelable.Creator](https://developer.android.com/reference/kotlin/android/os/Parcelable.Creator.html#)\<[Checksum](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#)!\> | [CREATOR](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#CREATOR:android.os.Parcelable.Creator)
|
## Constants
### TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256: Int
```
Root SHA256 hash of a 1M Merkle tree computed over protected content. Excludes signing block.[See APK Signature Scheme V2](https://source.android.com/security/apksigning/v2).
Value: 32
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512: Int
```
Root SHA512 hash of a 1M Merkle tree computed over protected content. Excludes signing block.[See APK Signature Scheme V2](https://source.android.com/security/apksigning/v2).
Value: 64
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_WHOLE_MD5
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_WHOLE_MD5: Int
```
**Deprecated:** *Not platform enforced. Cryptographically broken and unsuitable for further use. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int). Provided for completeness' sake and to support legacy usecases.*
MD5 hash computed over all file bytes.
Value: 2
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_WHOLE_MERKLE_ROOT_4K_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_WHOLE_MERKLE_ROOT_4K_SHA256: Int
```
Root SHA256 hash of a 4K Merkle tree computed over all file bytes.[See APK Signature Scheme V4](https://source.android.com/security/apksigning/v4).[See fs-verity](https://www.kernel.org/doc/html/latest/filesystems/fsverity.html). Recommended for all new applications. Can be used by kernel to enforce authenticity and integrity of the APK.[See fs-verity for details](https://www.kernel.org/doc/html/latest/filesystems/fsverity.html)
Value: 1
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_WHOLE_SHA1
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_WHOLE_SHA1: Int
```
**Deprecated:** *Not platform enforced. Broken and should not be used. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int). Provided for completeness' sake and to support legacy usecases.*
SHA1 hash computed over all file bytes.
Value: 4
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_WHOLE_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_WHOLE_SHA256: Int
```
**Deprecated:** *Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int). Provided for completeness' sake and to support legacy usecases.*
SHA256 hash computed over all file bytes.
Value: 8
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
### TYPE_WHOLE_SHA512
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val TYPE_WHOLE_SHA512: Int
```
**Deprecated:** *Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int). Provided for completeness' sake and to support legacy usecases.*
SHA512 hash computed over all file bytes.
Value: 16
**See Also**
- [android.content.pm.PackageManager#requestChecksums](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager#requestChecksums(kotlin.String,%20kotlin.Boolean,%20kotlin.Int,%20kotlin.collections.MutableList,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
## Public constructors
### Checksum
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
Checksum(
type: Int,
value: ByteArray)
```
Creates a new Checksum.
| Parameters ||
|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `type` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):Checksum type. Value is[android.content.pm.Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_MD5](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MD5:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA1](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA1:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA256:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA512:kotlin.Int),[android.content.pm.Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256:kotlin.Int), or[android.content.pm.Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512:kotlin.Int) |
| `value` | [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html):Checksum value. This value cannot be`null`. |
## Public methods
### describeContents
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
fun describeContents(): Int
```
| Return ||
|----------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either`0`or[android.os.Parcelable#CONTENTS_FILE_DESCRIPTOR](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#CONTENTS_FILE_DESCRIPTOR:kotlin.Int) |
### getType
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
fun getType(): Int
```
Checksum type.
| Return ||
|----------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | Value is[android.content.pm.Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_MD5](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_MD5:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA1](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA1:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA256:kotlin.Int),[android.content.pm.Checksum#TYPE_WHOLE_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_WHOLE_SHA512:kotlin.Int),[android.content.pm.Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256:kotlin.Int), or[android.content.pm.Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/kotlin/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512:kotlin.Int) |
### getValue
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
fun getValue(): ByteArray
```
Checksum value.
| Return ||
|-----------------------------------------------------------------------------------------|-----------------------------|
| [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html) | This value cannot be`null`. |
### writeToParcel
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
fun writeToParcel(
dest: Parcel,
flags: Int
): Unit
```
Flatten this object in to a Parcel.
| Parameters ||
|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `dest` | [Parcel](https://developer.android.com/reference/kotlin/android/os/Parcel.html#):This value cannot be`null`. |
| `flags` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):Additional flags about how the object should be written. May be 0 or[PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int). Value is either`0`or a combination of[android.os.Parcelable#PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int), and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES |
## Properties
### CREATOR
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
static val CREATOR: Parcelable.Creator
```