org.bouncycastle.crypto.macs
Class BlockCipherMac
java.lang.Object
org.bouncycastle.crypto.macs.BlockCipherMac
- Mac
public class BlockCipherMac
extends java.lang.Object
BlockCipherMac
public BlockCipherMac(BlockCipher cipher)
use CBCBlockCipherMac
create a standard MAC based on a block cipher. This will produce an
authentication code half the length of the block size of the cipher.
cipher
- the cipher to be used as the basis of the MAC generation.
BlockCipherMac
public BlockCipherMac(BlockCipher cipher,
int macSizeInBits)
use CBCBlockCipherMac
create a standard MAC based on a block cipher with the size of the
MAC been given in bits.
Note: the size of the MAC must be at least 16 bits (FIPS Publication 113),
and in general should be less than the size of the block cipher as it reduces
the chance of an exhaustive attack (see Handbook of Applied Cryptography).
cipher
- the cipher to be used as the basis of the MAC generation.macSizeInBits
- the size of the MAC in bits, must be a multiple of 8.
doFinal
public int doFinal(byte[] out,
int outOff)
- doFinal in interface Mac
reset
public void reset()
Reset the mac generator.
- reset in interface Mac
update
public void update(byte in)
- update in interface Mac
update
public void update(byte[] in,
int inOff,
int len)
- update in interface Mac