Package org.bouncycastle.oldcrypto.macs

Class I2PHMac

java.lang.Object

org.bouncycastle.oldcrypto.macs.I2PHMac

All Implemented Interfaces:

Mac

public class I2PHMac
extends Object
implements Mac

HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text)) modified by jrandom to use the session key byte array directly and to cache a frequently used buffer (called on doFinal). changes released into the public domain in 2005. This is renamed from HMac because the constructor HMac(digest, sz) does not exist in the standard bouncycastle library, thus it conflicts in JVMs that contain the standard library (Android). As of 0.9.12, refactored to use standard MessageDigest. Deprecated - Do not use outside of router or Syndie. To be moved to router.

Constructor Summary

Constructors

Constructor	Description
I2PHMac(MessageDigest digest)	Deprecated. Use javax.crypto.Mac
I2PHMac(MessageDigest digest, int sz)

Method Summary

Modifier and Type	Method	Description
int	doFinal(byte[] out, int outOff)	Compute the final statge of the MAC writing the output to the out parameter.
String	getAlgorithmName()	Return the name of the algorithm the MAC implements.
int	getMacSize()	Return the block size for this cipher (in bytes).
MessageDigest	getUnderlyingDigest()
void	init(byte[] key)	Initialise the MAC.
void	reset()	Reset the mac generator.
void	update(byte in)	add a single byte to the mac for processing.
void	update(byte[] in, int inOff, int len)

Methods inherited from class java.lang.Object

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

Constructor Detail

I2PHMac

@Deprecated
public I2PHMac(MessageDigest digest)

Deprecated.

Use javax.crypto.Mac

Standard HMAC, size == digest size.

I2PHMac

public I2PHMac(MessageDigest digest,
               int sz)

Parameters:

sz - override the digest's size, nonstandard if different. SEE NOTES in HMACGenerator about why this isn't compatible with standard HmacMD5

Method Detail

getAlgorithmName

public String getAlgorithmName()

Description copied from interface: Mac

Return the name of the algorithm the MAC implements.

Specified by:

getAlgorithmName in interface Mac

Returns:

the name of the algorithm the MAC implements.

getUnderlyingDigest

public MessageDigest getUnderlyingDigest()

init

public void init(byte[] key)

Description copied from interface: Mac

Initialise the MAC.

Specified by:

init in interface Mac

Parameters:

key - the key required by the MAC.

getMacSize

public int getMacSize()

Description copied from interface: Mac

Return the block size for this cipher (in bytes).

Specified by:

getMacSize in interface Mac

Returns:

the block size for this cipher in bytes.

update

public void update(byte in)

Description copied from interface: Mac

add a single byte to the mac for processing.

Specified by:

update in interface Mac

Parameters:

in - the byte to be processed.

update

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

Specified by:

update in interface Mac

Parameters:

in - the array containing the input.

inOff - the index in the array the data begins at.

len - the length of the input starting at inOff.

doFinal

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

Description copied from interface: Mac

Compute the final statge of the MAC writing the output to the out parameter.

doFinal leaves the MAC in the same state it was after the last init.

Specified by:

doFinal in interface Mac

Parameters:

out - the array the MAC is to be output to.

outOff - the offset into the out buffer the output is to start at.

reset

public void reset()

Reset the mac generator.

Specified by:

reset in interface Mac