ConcatKDF (Apache XML Security for Java 4.0.4 API)

java.lang.Object
- org.apache.xml.security.encryption.keys.content.derivedKey.ConcatKDF

All Implemented Interfaces:

DerivationAlgorithm<ConcatKDFParams>
```
public class ConcatKDF
extends Object
implements DerivationAlgorithm<ConcatKDFParams>
```
Key DerivationAlgorithm implementation, defined in Section 5.8.1 of NIST SP 800-56A [SP800-56A], and is equivalent to the KDF3 function defined in ANSI X9.44-2007 [ANSI-X9-44-2007] when the contents of the OtherInfo parameter is structured as in NIST SP 800-56A.
Identifier of the key derivation algorithm: http://www.w3.org/2009/xmlenc11#ConcatKDF

Constructor Summary

Constructors
Constructor Description

ConcatKDF()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`deriveKey(byte[] sharedSecret, ConcatKDFParams concatKDFParams)`	Derives a key from the shared secret and other concat kdf parameters.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ConcatKDF
```
public ConcatKDF()
```
- Method Detail
  - deriveKey
```
public byte[] deriveKey(byte[] sharedSecret,
                        ConcatKDFParams concatKDFParams)
                 throws XMLSecurityException
```
    Derives a key from the shared secret and other concat kdf parameters.
    
    Specified by:
    
    deriveKey in interface DerivationAlgorithm<ConcatKDFParams>
    
    Parameters:
    
    sharedSecret - The "shared" secret used for the key derivation (e.g. the secret key)
    
    concatKDFParams - The concat key derivation parameters
    
    Returns:
    
    the derived key bytes
    
    Throws:
    
    IllegalArgumentException - if the concat KDF parameters are not set
    
    XMLSecurityException - if the key derivation parameters are invalid