org.bouncycastle.bcpg
Class AEADUtils

java.lang.Object
  |
  +--org.bouncycastle.bcpg.AEADUtils

All Implemented Interfaces:

AEADAlgorithmTags

public class AEADUtils

extends java.lang.Object

implements AEADAlgorithmTags

Fields inherited from interface org.bouncycastle.bcpg.AEADAlgorithmTags

EAX, GCM, OCB

Method Summary

static int	getAuthTagLength(int aeadAlgorithmTag) Return the length of the authentication tag used by the given AEAD algorithm in octets.
static int	getIVLength(int aeadAlgorithmTag) Return the length of the IV used by the given AEAD algorithm in octets.
static byte[][]	splitMessageKeyAndIv(byte[] messageKeyAndIv, int cipherAlgo, int aeadAlgo) Split a given byte array containing m

Methods inherited from class java.lang.Object

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

Method Detail

getIVLength

public static int getIVLength(int aeadAlgorithmTag)

Return the length of the IV used by the given AEAD algorithm in octets.

Parameters:

aeadAlgorithmTag - AEAD algorithm identifier

Returns:

length of the IV

getAuthTagLength

public static int getAuthTagLength(int aeadAlgorithmTag)

Return the length of the authentication tag used by the given AEAD algorithm in octets.

Parameters:

aeadAlgorithmTag - AEAD algorithm identifier

Returns:

length of the auth tag

splitMessageKeyAndIv

public static byte[][] splitMessageKeyAndIv(byte[] messageKeyAndIv,
                                            int cipherAlgo,
                                            int aeadAlgo)

Split a given byte array containing m bytes of key and n-8 bytes of IV into two separate byte arrays. m is the key length of the cipher algorithm, while n is the IV length of the AEAD algorithm. Note, that the IV is filled with n-8 bytes only, the remainder is left as 0s. Return an array of both arrays with the key and index 0 and the IV at index 1.

Parameters:

messageKeyAndIv - m+n-8 bytes of concatenated message key and IV

cipherAlgo - symmetric cipher algorithm

aeadAlgo - AEAD algorithm

Returns:

array of arrays containing message key and IV