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package org.bouncycastle.jcajce.spec;
import javax.crypto.spec.IvParameterSpec;
import org.bouncycastle.util.Arrays;
/**
* ParameterSpec for AEAD modes which allows associated data to be added via an algorithm parameter spec.In normal
* circumstances you would only want to use this if you had to work with the pre-JDK1.7 Cipher class as associated
* data is ignored for the purposes of returning a Cipher's parameters.
*/
public class AEADParameterSpec
extends IvParameterSpec
{
private final byte[] associatedData;
private final int macSizeInBits;
/**
* Base constructor.
*
* @param nonce nonce/iv to be used
* @param macSizeInBits macSize in bits
*/
public AEADParameterSpec(byte[] nonce, int macSizeInBits)
{
this(nonce, macSizeInBits, null);
}
/**
* Base constructor with prepended associated data.
*
* @param nonce nonce/iv to be used
* @param macSizeInBits macSize in bits
* @param associatedData associated data to be prepended to the cipher stream.
*/
public AEADParameterSpec(byte[] nonce, int macSizeInBits, byte[] associatedData)
{
super(nonce);
this.macSizeInBits = macSizeInBits;
this.associatedData = Arrays.clone(associatedData);
}
/**
* Return the size of the MAC associated with this parameter spec.
*
* @return the MAC size in bits.
*/
public int getMacSizeInBits()
{
return macSizeInBits;
}
/**
* Return the associated data associated with this parameter spec.
*
* @return the associated data, null if there isn't any.
*/
public byte[] getAssociatedData()
{
return Arrays.clone(associatedData);
}
/**
* Return the nonce (same as IV) associated with this parameter spec.
*
* @return the nonce/IV.
*/
public byte[] getNonce()
{
return getIV();
}
}
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