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Java Source Code / Java Documentation » Security » Bouncy Castle » org.bouncycastle.crypto.macs

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.bouncycastle.crypto.macs .CMac

CMac

public class CMac implements Mac(Code)

CMAC - as specified at www.nuee.nagoya-u.ac.jp/labs/tiwata/omac/omac.html

CMAC is analogous to OMAC1 - see also en.wikipedia.org/wiki/CMAC

CMAC is a NIST recomendation - see csrc.nist.gov/CryptoToolkit/modes/800-38_Series_Publications/SP800-38B.pdf

CMAC/OMAC1 is a blockcipher-based message authentication code designed and analyzed by Tetsu Iwata and Kaoru Kurosawa.

CMAC/OMAC1 is a simple variant of the CBC MAC (Cipher Block Chaining Message Authentication Code). OMAC stands for One-Key CBC MAC.

It supports 128- or 64-bits block ciphers, with any key size, and returns a MAC with dimension less or equal to the block size of the underlying cipher.

Constructor Summary
public	CMac(BlockCipher cipher) create a standard MAC based on a CBC block cipher (64 or 128 bit block).
public	CMac(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
public int	doFinal(byte[] out, int outOff)
public String	getAlgorithmName()
public int	getMacSize()
public void	init(CipherParameters params)
public void	reset() Reset the mac generator.
public void	update(byte in)
public void	update(byte[] in, int inOff, int len)

Constructor Detail

CMac
public CMac(BlockCipher cipher)(Code)
	create a standard MAC based on a CBC block cipher (64 or 128 bit block). This will produce an authentication code the length of the block size of the cipher. Parameters: cipher - the cipher to be used as the basis of the MAC generation.

CMac
public CMac(BlockCipher cipher, int macSizeInBits)(Code)
	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 24 bits (FIPS Publication 81), or 16 bits if being used as a data authenticator (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. Parameters: macSizeInBits - the size of the MAC in bits, must be a multiple of 8 and <= 128.

Method Detail

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

getAlgorithmName
public String getAlgorithmName()(Code)

getMacSize
public int getMacSize()(Code)

init
public void init(CipherParameters params)(Code)

reset
public void reset()(Code)
	Reset the mac generator.

update
public void update(byte in)(Code)

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

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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