Package com.nimbusds.jose.crypto.impl

Class CompositeKey

java.lang.Object

com.nimbusds.jose.crypto.impl.CompositeKey

@Immutable
public final class CompositeKey
extends Object

Composite key used in AES/CBC/PKCS5Padding/HMAC-SHA2 encryption. This class is immutable.

See RFC 7518 (JWA), section 5.2.

See draft-mcgrew-aead-aes-cbc-hmac-sha2-01

Version:

2015-06-29

Author:

Vladimir Dzhuvinov

Constructor Summary

Constructors

Constructor	Description
CompositeKey(SecretKey inputKey)	Creates a new composite key from the specified secret key.

Method Summary

Modifier and Type	Method	Description
SecretKey	getAESKey()	Gets the extracted encryption key.
SecretKey	getInputKey()	Gets the input key.
SecretKey	getMACKey()	Gets the extracted MAC key.
int	getTruncatedMACByteLength()	Gets the expected truncated MAC length.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CompositeKey

public CompositeKey(SecretKey inputKey)
             throws KeyLengthException

Creates a new composite key from the specified secret key.

Parameters:

inputKey - The input key. Must be 256, 384 or 512 bits long. Must not be null.

Throws:

KeyLengthException - If the input key length is not supported.

Method Details

getInputKey

public SecretKey getInputKey()

Gets the input key.

Returns:

The input key.

getMACKey

public SecretKey getMACKey()

Gets the extracted MAC key.

Returns:

The extracted MAC key.

getTruncatedMACByteLength

public int getTruncatedMACByteLength()

Gets the expected truncated MAC length.

Returns:

The expected truncated MAC length, in bytes.

getAESKey

public SecretKey getAESKey()

Gets the extracted encryption key.

Returns:

The extracted encryption key.