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Checksum

public final class Checksum
extends Object implements Parcelable

java.lang.Object
   ↳ android.content.pm.Checksum


A typed checksum.

See also:

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 is deprecated. 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 is deprecated. 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 is deprecated. 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 is deprecated. 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

Fields

public static final Creator<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

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.

See also:

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.

See also:

Constant Value: 64 (0x00000040)

TYPE_WHOLE_MD5

public static final int TYPE_WHOLE_MD5

This constant is deprecated.
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.

MD5 hash computed over all file bytes.

See also:

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

See also:

Constant Value: 1 (0x00000001)

TYPE_WHOLE_SHA1

public static final int TYPE_WHOLE_SHA1

This constant is deprecated.
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.

SHA1 hash computed over all file bytes.

See also:

Constant Value: 4 (0x00000004)

TYPE_WHOLE_SHA256

public static final int TYPE_WHOLE_SHA256

This constant is deprecated.
Not platform enforced. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.

SHA256 hash computed over all file bytes.

See also:

Constant Value: 8 (0x00000008)

TYPE_WHOLE_SHA512

public static final int TYPE_WHOLE_SHA512

This constant is deprecated.
Not platform enforced. Use platform enforced digests e.g. TYPE_WHOLE_MERKLE_ROOT_4K_SHA256. Provided for completeness' sake and to support legacy usecases.

SHA512 hash computed over all file bytes.

See also:

Constant Value: 16 (0x00000010)

Fields

CREATOR

public static final Creator<Checksum> CREATOR

Public constructors

Checksum

public Checksum (int type, 
                byte[] value)

Creates a new Checksum.

Parameters
type int: Checksum type. Value is TYPE_WHOLE_MERKLE_ROOT_4K_SHA256, TYPE_WHOLE_MD5, TYPE_WHOLE_SHA1, TYPE_WHOLE_SHA256, TYPE_WHOLE_SHA512, TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256, or TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512

value byte: Checksum value. This value cannot be null.

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), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR 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

getType

public int getType ()

Checksum type.

Returns
int Value is TYPE_WHOLE_MERKLE_ROOT_4K_SHA256, TYPE_WHOLE_MD5, TYPE_WHOLE_SHA1, TYPE_WHOLE_SHA256, TYPE_WHOLE_SHA512, TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256, or TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512

getValue

public byte[] getValue ()

Checksum value.

Returns
byte[] This value cannot be null.

writeToParcel

public void writeToParcel (Parcel dest, 
                int flags)

Flatten this object in to a Parcel.

Parameters
dest Parcel: This value cannot be null.

flags int: Additional flags about how the object should be written. May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE. Value is either 0 or a combination of Parcelable.PARCELABLE_WRITE_RETURN_VALUE, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES