HMACParameterSpec (Java SE 9 & JDK 9 )

java.lang.Object
- javax.xml.crypto.dsig.spec.HMACParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec, SignatureMethodParameterSpec
```
public final class HMACParameterSpec
extends Object
implements SignatureMethodParameterSpec
```
Parameters for the XML Signature HMAC Algorithm. The parameters include an optional output length which specifies the MAC truncation length in bits. The resulting HMAC will be truncated to the specified number of bits. If the parameter is not specified, then this implies that all the bits of the hash are to be output. The XML Schema Definition of the HMACOutputLength element is defined as:
```
 <element name="HMACOutputLength" minOccurs="0" type="ds:HMACOutputLengthType"/>
 <simpleType name="HMACOutputLengthType">
   <restriction base="integer"/>
 </simpleType>
 
```
Since:

1.6

See Also:

SignatureMethod, RFC 2104

- Constructor Summary
  
  Constructors
  Constructor Description
  
  HMACParameterSpec(int outputLength)
  Creates an HMACParameterSpec with the specified truncation length.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  int getOutputLength()
  Returns the truncation length.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - HMACParameterSpec
```
public HMACParameterSpec(int outputLength)
```
    Creates an HMACParameterSpec with the specified truncation length.
    
    Parameters:
    
    outputLength - the truncation length in number of bits
- Method Detail
  - getOutputLength
```
public int getOutputLength()
```
    Returns the truncation length.
    
    Returns:
    
    the truncation length in number of bits