org.bouncycastle.crypto.macs

Class BlockCipherMac

public class BlockCipherMac extends Object implements Mac

Constructor Summary
BlockCipherMac(BlockCipher cipher)
create a standard MAC based on a block cipher.
BlockCipherMac(BlockCipher cipher, int macSizeInBits)
create a standard MAC based on a block cipher with the size of the MAC been given in bits.
Method Summary
intdoFinal(byte[] out, int outOff)
StringgetAlgorithmName()
intgetMacSize()
voidinit(CipherParameters params)
voidreset()
Reset the mac generator.
voidupdate(byte in)
voidupdate(byte[] in, int inOff, int len)

Constructor Detail

BlockCipherMac

public BlockCipherMac(BlockCipher cipher)

Deprecated: 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.

Parameters: cipher the cipher to be used as the basis of the MAC generation.

BlockCipherMac

public BlockCipherMac(BlockCipher cipher, int macSizeInBits)

Deprecated: 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).

Parameters: 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.

Method Detail

doFinal

public int doFinal(byte[] out, int outOff)

getAlgorithmName

public String getAlgorithmName()

getMacSize

public int getMacSize()

init

public void init(CipherParameters params)

reset

public void reset()
Reset the mac generator.

update

public void update(byte in)

update

public void update(byte[] in, int inOff, int len)