net.i2p.crypto
Class HMACGenerator

java.lang.Object
  extended by 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()