Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Fields](https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#lfields) \| [Ctors](https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#pubctors) \| [Methods](https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#inhmethods)

# MGF1ParameterSpec

` public class MGF1ParameterSpec `   
` extends https://developer.android.com/reference/java/lang/Object ` ` implements https://developer.android.com/reference/java/security/spec/AlgorithmParameterSpec `

|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | java.security.spec.MGF1ParameterSpec |

<br />

*** ** * ** ***

This class specifies the set of parameters used with mask generation function MGF1 in OAEP Padding and RSASSA-PSS signature scheme, as defined in the [PKCS#1 v2.2](https://tools.ietf.org/rfc/rfc8017.txt) standard.

Its ASN.1 definition in PKCS#1 standard is described below:

```
PKCS1MGFAlgorithms    ALGORITHM-IDENTIFIER ::= {
  { OID id-mgf1 PARAMETERS HashAlgorithm },
  ...  -- Allows for future expansion --
}
```
where

```
HashAlgorithm ::= AlgorithmIdentifier {
  {OAEP-PSSDigestAlgorithms}
}

OAEP-PSSDigestAlgorithms    ALGORITHM-IDENTIFIER ::= {
  { OID id-sha1       PARAMETERS NULL }|
  { OID id-sha224     PARAMETERS NULL }|
  { OID id-sha256     PARAMETERS NULL }|
  { OID id-sha384     PARAMETERS NULL }|
  { OID id-sha512     PARAMETERS NULL }|
  { OID id-sha512-224 PARAMETERS NULL }|
  { OID id-sha512-256 PARAMETERS NULL },
  ...  -- Allows for future expansion --
}
```

<br />

**See also:**

- `https://developer.android.com/reference/java/security/spec/PSSParameterSpec`
- `https://developer.android.com/reference/javax/crypto/spec/OAEPParameterSpec`

## Summary

| ### Fields ||
|---|---|
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA1` The MGF1ParameterSpec which uses "SHA-1" message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA224` The MGF1ParameterSpec which uses "SHA-224" message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA256` The MGF1ParameterSpec which uses "SHA-256" message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA384` The MGF1ParameterSpec which uses "SHA-384" message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA3_224` The MGF1ParameterSpec which uses SHA3-224 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA3_256` The MGF1ParameterSpec which uses SHA3-256 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA3_384` The MGF1ParameterSpec which uses SHA3-384 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA3_512` The MGF1ParameterSpec which uses SHA3-512 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA512` The MGF1ParameterSpec which uses SHA-512 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA512_224` The MGF1ParameterSpec which uses SHA-512/224 message digest |
| ` public static final https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec` | `https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#SHA512_256` The MGF1ParameterSpec which uses SHA-512/256 message digest |

| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#MGF1ParameterSpec(java.lang.String)(https://developer.android.com/reference/java/lang/String mdName) ` Constructs a parameter set for mask generation function MGF1 as defined in the PKCS #1 standard. |

| ### Public methods ||
|---|---|
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#getDigestAlgorithm()() ` Returns the algorithm name of the message digest used by the mask generation function. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/security/spec/MGF1ParameterSpec#toString()() ` Returns a string representation of the object. |

### Inherited methods

From class ` https://developer.android.com/reference/java/lang/Object ` ` https://developer.android.com/reference/java/lang/Object` ` https://developer.android.com/reference/java/lang/Object#clone()() `

Creates and returns a copy of this object.
` boolean` ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) `

Indicates whether some other object is "equal to" this one.
` void` ` https://developer.android.com/reference/java/lang/Object#finalize()() `

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/Object#getClass()() `

Returns the runtime class of this `Object`.
` int` ` https://developer.android.com/reference/java/lang/Object#hashCode()() `

Returns a hash code value for the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#notify()() `

Wakes up a single thread that is waiting on this object's monitor.
` final void` ` https://developer.android.com/reference/java/lang/Object#notifyAll()() `

Wakes up all threads that are waiting on this object's monitor.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Object#toString()() `

Returns a string representation of the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(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` ` https://developer.android.com/reference/java/lang/Object#wait(long)(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` ` https://developer.android.com/reference/java/lang/Object#wait()() `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*.

## Fields

### SHA1

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

```
public static final MGF1ParameterSpec SHA1
```

The MGF1ParameterSpec which uses "SHA-1" message digest

<br />

### SHA224

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA224
```

The MGF1ParameterSpec which uses "SHA-224" message digest

<br />

### SHA256

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

```
public static final MGF1ParameterSpec SHA256
```

The MGF1ParameterSpec which uses "SHA-256" message digest

<br />

### SHA384

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

```
public static final MGF1ParameterSpec SHA384
```

The MGF1ParameterSpec which uses "SHA-384" message digest

<br />

### SHA3_224

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA3_224
```

The MGF1ParameterSpec which uses SHA3-224 message digest

<br />

### SHA3_256

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA3_256
```

The MGF1ParameterSpec which uses SHA3-256 message digest

<br />

### SHA3_384

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA3_384
```

The MGF1ParameterSpec which uses SHA3-384 message digest

<br />

### SHA3_512

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA3_512
```

The MGF1ParameterSpec which uses SHA3-512 message digest

<br />

### SHA512

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

```
public static final MGF1ParameterSpec SHA512
```

The MGF1ParameterSpec which uses SHA-512 message digest

<br />

### SHA512_224

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA512_224
```

The MGF1ParameterSpec which uses SHA-512/224 message digest

<br />

### SHA512_256

Added in [API level 35](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final MGF1ParameterSpec SHA512_256
```

The MGF1ParameterSpec which uses SHA-512/256 message digest

<br />

## Public constructors

### MGF1ParameterSpec

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

```
public MGF1ParameterSpec (String mdName)
```

Constructs a parameter set for mask generation function MGF1 as defined in the PKCS #1 standard.

<br />

| Parameters ||
|---|---|
| `mdName` | `String`: the algorithm name for the message digest used in this mask generation function MGF1. <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/NullPointerException` | if `mdName` is null. |

## Public methods

### getDigestAlgorithm

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

```
public String getDigestAlgorithm ()
```

Returns the algorithm name of the message digest used by the mask generation function.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | the algorithm name of the message digest. <br /> |

### toString

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

```
public String toString ()
```

Returns a string representation of the object.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string representation of the object. <br /> |