com.google.crypto.tink.internal

Class Util

java.lang.Object

com.google.crypto.tink.internal.Util

public final class Util
extends Object

Helper functions used throughout Tink, for Tink internal use only.

Field Summary

Fields

Modifier and Type	Field and Description
static Charset	UTF_8 Android 18-compatible alternative to StandardCharsets.UTF_8.

Method Summary

Modifier and Type	Method and Description
static Integer	getAndroidApiLevel() Returns the current Android API level as integer or null if we do not run on Android.
static boolean	isAndroid() Best-effort checks that this is Android.
static int	randKeyId() Returns a positive random int which can be used as a key ID in a keyset.
static Bytes	toBytesFromPrintableAscii(String s) Converts a string s to a corresponding Bytes object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UTF_8

public static final Charset UTF_8

Android 18-compatible alternative to StandardCharsets.UTF_8.

Method Detail

randKeyId

public static int randKeyId()

Returns a positive random int which can be used as a key ID in a keyset.

toBytesFromPrintableAscii

public static final Bytes toBytesFromPrintableAscii(String s)

Converts a string s to a corresponding Bytes object.

The string must contain only printable ASCII characters; calling it in any other way is a considered a bug in Tink. Spaces are not allowed.

Throws:

TinkBugException - if s contains a character which is not a printable ASCII character.

isAndroid

public static boolean isAndroid()

Best-effort checks that this is Android.

Note: this is more tricky than it seems. For example, using reflection to see if android.os.Build.SDK_INT exists might fail because proguard might break the reflection part. Using build dispatching can also fail if there are issues in the build graph (see cl/510374081).

Returns:

true if running on Android.

getAndroidApiLevel

@Nullable
public static Integer getAndroidApiLevel()

Returns the current Android API level as integer or null if we do not run on Android.