net.i2p.crypto
Class HMACGenerator

java.lang.Object
  net.i2p.crypto.HMACGenerator

Direct Known Subclasses:

HMAC256Generator

public class HMACGenerator
extends java.lang.Object

Calculate the HMAC-MD5 of a key+message. All the good stuff occurs in I2PHMac and MD5Digest.

Field Summary

protected java.util.List

_available set of available HMAC instances for calculate

Constructor Summary

HMACGenerator(I2PAppContext context)

Method Summary

protected I2PHMac	acquire()
Hash	calculate(SessionKey key, byte[] data) Calculate the HMAC of the data with the given key
void	calculate(SessionKey key, byte[] data, int offset, int length, byte[] target, int targetOffset) Calculate the HMAC of the data with the given key
boolean	verify(SessionKey key, byte[] curData, int curOffset, int curLength, byte[] origMAC, int origMACOffset, int origMACLength) Verify the MAC inline, reducing some unnecessary memory churn.

Methods inherited from class java.lang.Object

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

Field Detail

_available

protected final java.util.List _available

set of available HMAC instances for calculate

Constructor Detail

HMACGenerator

public HMACGenerator(I2PAppContext context)

Method Detail

calculate

public Hash calculate(SessionKey key,
                      byte[] data)

Calculate the HMAC of the data with the given key

calculate

public void calculate(SessionKey key,
                      byte[] data,
                      int offset,
                      int length,
                      byte[] target,
                      int targetOffset)

Calculate the HMAC of the data with the given key

verify

public boolean verify(SessionKey key,
                      byte[] curData,
                      int curOffset,
                      int curLength,
                      byte[] origMAC,
                      int origMACOffset,
                      int origMACLength)

Verify the MAC inline, reducing some unnecessary memory churn.

Parameters:

key - session key to verify the MAC with

curData - MAC to verify

curOffset - index into curData to MAC

curLength - how much data in curData do we want to run the HMAC over

origMAC - what do we expect the MAC of curData to equal

origMACOffset - index into origMAC

origMACLength - how much of the MAC do we want to verify

acquire

protected I2PHMac acquire()