Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# Signature

*** ** * ** ***

Kotlin \|[Java](https://developer.android.com/reference/android/content/pm/Signature "View this page in Java")

```
open class Signature : Parcelable
```

|---|---|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||
| ↳ | [android.content.pm.Signature](https://developer.android.com/reference/kotlin/android/content/pm/Signature#) |

Opaque, immutable representation of a signing certificate associated with an application package.

This class name is slightly misleading, since it's not actually a signature.

## Summary

| Inherited constants ||
|---|---|
| From class `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#` |---|---| | `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#CONTENTS_FILE_DESCRIPTOR:kotlin.Int` Descriptor bit used with `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor. <br /> | | `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int` Flag for use with `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. <br /> | ||

| Public constructors ||
|---|---|
| `https://developer.android.com/reference/kotlin/android/content/pm/Signature#Signature(kotlin.ByteArray)(signature: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!)` Create Signature from an existing raw byte array. |
| `https://developer.android.com/reference/kotlin/android/content/pm/Signature#Signature(kotlin.String)(text: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` Create Signature from a text representation previously returned by #toChars or `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toCharsString()`. |

| Public methods ||
|---|---|
| open [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#describeContents()()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
| open [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#equals(kotlin.Any)(other: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html?)` Indicates whether some other object is "equal to" this one. |
| open [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#hashCode()()` Returns a hash code value for the object. |
| open [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html)! | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toByteArray()()` <br /> |
| open [CharArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-array/index.html)! | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toChars()()` Encode the Signature as ASCII text. |
| open [CharArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-array/index.html)! | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toChars(kotlin.CharArray,%20kotlin.IntArray)(existingArray: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-array/index.html!, outLen: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html!)` Encode the Signature as ASCII text in to an existing array. |
| open [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toCharsString()()` Return the result of `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toChars()` as a String. |
| open [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#writeToParcel(android.os.Parcel,%20kotlin.Int)(dest: https://developer.android.com/reference/kotlin/android/os/Parcel.html#, parcelableFlags: 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#)\<[Signature](https://developer.android.com/reference/kotlin/android/content/pm/Signature#)!\> | `https://developer.android.com/reference/kotlin/android/content/pm/Signature#CREATOR:android.os.Parcelable.Creator` <br /> |

## Public constructors

### Signature

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
Signature(signature: ByteArray!)
```

Create Signature from an existing raw byte array.

### Signature

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
Signature(text: String!)
```

Create Signature from a text representation previously returned by #toChars or `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toCharsString()`. Signatures are expected to be a hex-encoded ASCII string.

| Parameters ||
|---|---|
| `text` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!: hex-encoded string representing the signature |

| Exceptions ||
|---|---|
| `java.lang.IllegalArgumentException` | when signature is odd-length |

## Public methods

### describeContents

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun describeContents(): Int
```

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 `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#writeToParcel(android.os.Parcel,%20kotlin.Int)`, the return value of this method must include the `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#CONTENTS_FILE_DESCRIPTOR:kotlin.Int` bit.

| Return ||
|---|---|
| `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 - `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#CONTENTS_FILE_DESCRIPTOR:kotlin.Int` |

### equals

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun equals(other: Any?): Boolean
```

Indicates whether some other object is "equal to" this one.

The `equals` method implements an equivalence relation on non-null object references:

- It is *reflexive* : for any non-null reference value `x`, `x.equals(x)` should return `true`.
- It is *symmetric* : for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`.
- It is *transitive* : for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.
- It is *consistent* : for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified.
- For any non-null reference value `x`, `x.equals(null)` should return `false`.

An equivalence relation partitions the elements it operates on into *equivalence classes*; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

| Parameters ||
|---|---|
| `obj` | This value may be `null`. |

| Return ||
|---|---|
| `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html` | `true` if this object is the same as the obj argument; `false` otherwise. |

### hashCode

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun hashCode(): Int
```

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `https://developer.android.com/reference/kotlin/java/util/HashMap.html#`.

The general contract of `hashCode` is:

- Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the `https://developer.android.com/reference/kotlin/java/lang/Object.html#equals(kotlin.Any)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result.
- It is *not* required that if two objects are unequal according to the `https://developer.android.com/reference/kotlin/java/lang/Object.html#equals(kotlin.Any)` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

| Return ||
|---|---|
| `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html` | a hash code value for this object. |

### toByteArray

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun toByteArray(): ByteArray!
```

| Return ||
|---|---|
| `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!` | the contents of this signature as a byte array. |

### toChars

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun toChars(): CharArray!
```

Encode the Signature as ASCII text.

### toChars

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun toChars(
    existingArray: CharArray!, 
    outLen: IntArray!
): CharArray!
```

Encode the Signature as ASCII text in to an existing array.

| Parameters ||
|---|---|
| `existingArray` | [CharArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-array/index.html)!: Existing char array or null. |
| `outLen` | [IntArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html)!: Output parameter for the number of characters written in to the array. |

| Return ||
|---|---|
| `https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-array/index.html!` | Returns either existingArray if it was large enough to hold the ASCII representation, or a newly created char\[\] array if needed. |

### toCharsString

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun toCharsString(): String!
```

Return the result of `https://developer.android.com/reference/kotlin/android/content/pm/Signature#toChars()` as a String.

### writeToParcel

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
open fun writeToParcel(
    dest: Parcel, 
    parcelableFlags: Int
): Unit
```

Flatten this object in to a Parcel.

| Parameters ||
|---|---|
| `dest` | [Parcel](https://developer.android.com/reference/kotlin/android/os/Parcel.html#): The Parcel in which the object should be written. This value cannot be `null`. |
| `flags` | Additional flags about how the object should be written. May be 0 or `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int`. Value is either `0` or a combination of the following: - `https://developer.android.com/reference/kotlin/android/os/Parcelable.html#PARCELABLE_WRITE_RETURN_VALUE:kotlin.Int` |

## Properties

### CREATOR

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

```
static val CREATOR: Parcelable.Creator<Signature!>
```