Checksum | API reference | Android Developers (original) (raw)

public final class Checksum
extends [Object](/reference/java/lang/Object) implements[Parcelable](/reference/android/os/Parcelable)

A typed checksum.

See also:

[ApkChecksum](/reference/android/content/pm/ApkChecksum)
[PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](/reference/android/content/pm/PackageManager#requestChecksums%28java.lang.String,%20boolean,%20int,%20java.util.List<java.security.cert.Certificate>,%20android.content.pm.PackageManager.OnChecksumsReadyListener%29)

Summary

Constants
int	TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256 Root SHA256 hash of a 1M Merkle tree computed over protected content.
int	TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512 Root SHA512 hash of a 1M Merkle tree computed over protected content.
int	TYPE_WHOLE_MD5 This constant was deprecated in API level 31. Not platform enforced. Cryptographically broken and unsuitable for further use. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.
int	TYPE_WHOLE_MERKLE_ROOT_4K_SHA256 Root SHA256 hash of a 4K Merkle tree computed over all file bytes.
int	TYPE_WHOLE_SHA1 This constant was deprecated in API level 31. Not platform enforced. Broken and should not be used. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.
int	TYPE_WHOLE_SHA256 This constant was deprecated in API level 31. Not platform enforced. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.
int	TYPE_WHOLE_SHA512 This constant was deprecated in API level 31. Not platform enforced. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.

Inherited constants
From interfaceandroid.os.Parcelable int CONTENTS_FILE_DESCRIPTOR Descriptor bit used with describeContents(): indicates that the Parcelable object's flattened representation includes a file descriptor. int PARCELABLE_WRITE_RETURN_VALUE Flag for use with writeToParcel(Parcel, 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)".

Inherited constants

From interfaceandroid.os.Parcelable int CONTENTS_FILE_DESCRIPTOR Descriptor bit used with describeContents(): indicates that the Parcelable object's flattened representation includes a file descriptor. int PARCELABLE_WRITE_RETURN_VALUE Flag for use with writeToParcel(Parcel, 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)".

Fields
public static finalCreator<Checksum>	CREATOR

Public constructors
Checksum(int type, byte[] value) Creates a new Checksum.

Public methods
int	describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
int	getType() Checksum type.
byte[]	getValue() Checksum value.
void	writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Inherited methods
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. finalClass<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
From interface android.os.Parcelable abstract int describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. abstract void writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Inherited methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. finalClass<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface android.os.Parcelable abstract int describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. abstract void writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Constants

TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256

public static final int TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256

Root SHA256 hash of a 1M Merkle tree computed over protected content. Excludes signing block.See APK Signature Scheme V2.

Constant Value: 32 (0x00000020)

TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512

public static final int TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512

Root SHA512 hash of a 1M Merkle tree computed over protected content. Excludes signing block.See APK Signature Scheme V2.

Constant Value: 64 (0x00000040)

TYPE_WHOLE_MD5

public static final int TYPE_WHOLE_MD5

This constant was deprecated in API level 31.
Not platform enforced. Cryptographically broken and unsuitable for further use. Use platform enforced digests e.g. [TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](/reference/android/content/pm/Checksum#TYPE%5FWHOLE%5FMERKLE%5FROOT%5F4K%5FSHA256). Provided for completeness' sake and to support legacy usecases.

MD5 hash computed over all file bytes.

Constant Value: 2 (0x00000002)

TYPE_WHOLE_MERKLE_ROOT_4K_SHA256

public static final int TYPE_WHOLE_MERKLE_ROOT_4K_SHA256

Root SHA256 hash of a 4K Merkle tree computed over all file bytes.See APK Signature Scheme V4.See fs-verity. Recommended for all new applications. Can be used by kernel to enforce authenticity and integrity of the APK.See fs-verity for details

Constant Value: 1 (0x00000001)

TYPE_WHOLE_SHA1

public static final int TYPE_WHOLE_SHA1

This constant was deprecated in API level 31.
Not platform enforced. Broken and should not be used. Use platform enforced digests e.g. [TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](/reference/android/content/pm/Checksum#TYPE%5FWHOLE%5FMERKLE%5FROOT%5F4K%5FSHA256). Provided for completeness' sake and to support legacy usecases.

SHA1 hash computed over all file bytes.

Constant Value: 4 (0x00000004)

TYPE_WHOLE_SHA256

public static final int TYPE_WHOLE_SHA256

This constant was deprecated in API level 31.
Not platform enforced. Use platform enforced digests e.g. [TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](/reference/android/content/pm/Checksum#TYPE%5FWHOLE%5FMERKLE%5FROOT%5F4K%5FSHA256). Provided for completeness' sake and to support legacy usecases.

SHA256 hash computed over all file bytes.

Constant Value: 8 (0x00000008)

TYPE_WHOLE_SHA512

public static final int TYPE_WHOLE_SHA512

SHA512 hash computed over all file bytes.

Constant Value: 16 (0x00000010)

Fields

Public constructors

Public methods

describeContents

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of [writeToParcel(android.os.Parcel, int)](/reference/android/os/Parcelable#writeToParcel%28android.os.Parcel,%20int%29), the return value of this method must include the[CONTENTS_FILE_DESCRIPTOR](/reference/android/os/Parcelable#CONTENTS%5FFILE%5FDESCRIPTOR) bit.

Returns
int	a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either 0 or CONTENTS_FILE_DESCRIPTOR

getValue

public byte[] getValue ()

Checksum value.

Returns
byte[]	This value cannot be null.