MGF1ParameterSpec

AI-generated Key Takeaways

MGF1ParameterSpec defines parameters for the Mask Generation Function MGF1 used in OAEP padding and RSA-PSS signatures, as per PKCS #1 v2.1.
It specifies the message digest algorithm to be used with MGF1, such as SHA-1, SHA-224, SHA-256, SHA-384, or SHA-512.
Developers can create an MGF1ParameterSpec instance by providing the desired message digest algorithm name.
The getDigestAlgorithm() method allows retrieving the name of the message digest algorithm associated with the MGF1ParameterSpec instance.

public class MGF1ParameterSpec extends Object
implements AlgorithmParameterSpec

This class specifies the set of parameters used with mask generation function MGF1 in OAEP Padding and RSA-PSS signature scheme, as defined in the PKCS #1 v2.1 standard.

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

 MGF1Parameters ::= OAEP-PSSDigestAlgorthms

where

 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 },
   ...  -- Allows for future expansion --
 }

Field Summary

public static final MGF1ParameterSpec	SHA1	The MGF1ParameterSpec which uses "SHA-1" message digest.
public static final MGF1ParameterSpec	SHA224	The MGF1ParameterSpec which uses "SHA-224" message digest.
public static final MGF1ParameterSpec	SHA256	The MGF1ParameterSpec which uses "SHA-256" message digest.
public static final MGF1ParameterSpec	SHA384	The MGF1ParameterSpec which uses "SHA-384" message digest.
public static final MGF1ParameterSpec	SHA512	The MGF1ParameterSpec which uses SHA-512 message digest.

Public Constructor Summary

MGF1ParameterSpec(String mdName)

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

Public Method Summary

String

getDigestAlgorithm()

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

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.

Fields

public static final MGF1ParameterSpec SHA1

The MGF1ParameterSpec which uses "SHA-1" message digest.

public static final MGF1ParameterSpec SHA224

The MGF1ParameterSpec which uses "SHA-224" message digest.

public static final MGF1ParameterSpec SHA256

The MGF1ParameterSpec which uses "SHA-256" message digest.

public static final MGF1ParameterSpec SHA384

The MGF1ParameterSpec which uses "SHA-384" message digest.

public static final MGF1ParameterSpec SHA512

The MGF1ParameterSpec which uses SHA-512 message digest.

Public Constructors

public MGF1ParameterSpec (String mdName)